gcc 3.2 no longer works #4
Comments
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what's the error message? which prior version does work on RHEL 3? |
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It coredumps, 0.3.1 worked fine. Newer version of gcc work fine too, which is why I have been concentrating on the noinline stuff and comparing the assembler for the functions called by pointer between 0.3.3 and 0.3.1. I wanted to attach the generated assembler but failed to figure out how to do that on github... |
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I can't reproduce the issue with gcc 3.2.3 on a 32 bit linux. The testsuite runs fine. |
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which machine architecture are you using? |
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Odd, I was also using gcc 3.2.3 on 32-bit linux. Using python 2.7.2 but I didn't think that would matter. I'm starting to think that my investigations into noinline where a red-herring. I've put the assembler code I get generated at http://paste.pocoo.org/show/543585/, might be interesting to compare to the assembler generated by your test platform. |
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Hi, you're hitting a gcc bug. :( Right after calling slp_save_state it destroys local variables, then calls slp_restore_state, which overwrites those variables, then it uses the frame pointer to restore registers saved on the stack and of course it results in their corruption. Please compile with -Os which seemed to help in a similar case. I don't think there's anything wrong with switch code, the asm input constraints specifically tell gcc that those variables are used at the end of the function, but it does "addl $16, %esp" anyway. :( |
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rm -rf build; CFLAGS=-Os python setup.py build install does that or I can confirm that the test suite succeeds if compiled that way. |
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I've added a workaround in 199563f. |
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Passing -Os does indeed fix the problem. However the fix you committed does not quite work on my host since platform.platform() returns "Linux-2.4.21-63.EL-i686-athlon-with-redhat-3.9-Final". I changed it to the following if statement: if ((sys.platform == "openbsd4" and os.uname()[-1] == "i386")
or ("-with-redhat-3." in platform.platform()
and platform.machine() == 'i686')):
os.environ["CFLAGS"] = ("%s %s" % (os.environ.get("CFLAGS", ""), "-Os")).lstrip()
Thanks for so quickly finding out what the issue is! |
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I've committed that in 01c9e8a thanks flub for testing and snaury for confirming that this is a compiler bug! |
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I'm seeing exactly the same issue on Solaris 10 with a747442. Python 2.7 (r27:82500, Feb 8 2011, 11:39:07)
[GCC 3.4.3] on sunos5
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys, os, platform
>>> import sys, os, platform
>>> sys.platform, os.uname, platform.platform(), platform.machine()
('sunos5', <built-in function uname>, 'SunOS-5.10-sun4v-sparc-32bit-ELF', 'sun4v')Compiling with anything but -O3 (e.g. -Os, -O0, -O1, -O2) solves this. A GDB backtrace shows the problem appears to reside in the invocation of Using this patch prevents my problems: diff --git a/setup.py b/setup.py
index bc03c14..e503574 100755
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,9 @@ import sys, os, glob, platform
# https://bitbucket.org/ambroff/greenlet/issue/11/segfault-on-openbsd-i386
# https://github.com/python-greenlet/greenlet/issues/4
if ((sys.platform == "openbsd4" and os.uname()[-1] == "i386")
- or ("-with-redhat-3." in platform.platform() and platform.machine() == 'i686')):
+ or ("-with-redhat-3." in platform.platform() and platform.machine() == 'i686')
+ or (sys.platform == "sunos5" and os.uname()[-1] == "sun4v")
+ or ("SunOS" in platform.platform() and platform.machine() == "sun4v")):
os.environ["CFLAGS"] = ("%s %s" % (os.environ.get("CFLAGS", ""), "-Os")).lstrip()
try: |
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I've applied that in 229624e Thanks and please test that again! |
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@schmir the object hash e503574 for that file's exactly the same as what I have, so that should work. I'll try rebuilding it (at work, that's where we use good ol' Suns) tomorrow. |
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Fix confirmed. It runs OK now, where previously it produced a segfault at the first test case to run. |
navytux
added a commit
to navytux/greenlet
that referenced
this issue
Jan 10, 2022
…opagate to another greenlet and corrupt memory Hello up there. While working on Pygolang I've faced the following problem: a C++ exception thrown in one greenlet, without any try/catch block on that greenlet, might become propagated and "handled" by try/catch block established at another greenlet that happened to switch to the greenlet in question. "Handled" comes in quotes because the program usually segfaults after that. I've also observed segfaults before exception reaches user-level try/catch block - internally in __cxa_throw. Both this issues are likely of the same origin - due to the fact that C-level stack of a greenlet does not start from scratch and starts from C-level stack of the program state when the greenlet is switched to the first time. We already have one test for C++ exception handling in test_cpp that @snaury initially added in d9cb12a. However in that test all greenlets that throw C++ exceptions also put try/catch at the top of their C-stack. In the problem, that I describe, and that added test reproduces, there is no intended top-level try/catch block in C-stack of the greenlet in question that throws. As the test shows the exception becomes propagated to switcher's greenlet context and the program then dies with SIGSEGV: test_exception_switch_and_throw (greenlet.tests.test_cpp.CPPTests) ... terminate called after throwing an instance of 'exception_t' C++ exception unexpectedly caught in g1 <-- NOTE FAIL ====================================================================== FAIL: test_exception_switch_and_throw (greenlet.tests.test_cpp.CPPTests) ---------------------------------------------------------------------- Traceback (most recent call last): File "/home/kirr/src/tools/py/gevent/greenlet/src/greenlet/tests/test_cpp.py", line 62, in test_exception_switch_and_throw (ret, sig, " (core dumped)" if core else "")) AssertionError: failed with ret=0 sig=11 (core dumped) The C-level backtrace from the dumped core is attached in Appendix I. There the program dies somehow after running the code from _test_extension_cpp.cpp module. However with the following dirty-patch the situation becomes more clear: --- a/src/greenlet/tests/_test_extension_cpp.cpp +++ b/src/greenlet/tests/_test_extension_cpp.cpp @@ -70,6 +70,7 @@ test_exception_switch(PyObject* self, PyObject* args) static PyObject* py_test_exception_throw(PyObject* self, PyObject* args) { + abort(); if (!PyArg_ParseTuple(args, "")) return NULL; p_test_exception_throw(0); The C-level backtrace of this abort when, run from under g2, shows that g2 C-stack starts from what was there before for first greenlet with try/catch block: #0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50 python-greenlet#1 0x00007f8be31e9537 in __GI_abort () at abort.c:79 python-greenlet#2 0x00007f8be3529423 in py_test_exception_throw (self=0x0, args=0x7f8be317f050) at src/greenlet/tests/_test_extension_cpp.cpp:73 python-greenlet#3 0x00005584d0389903 in PyObject_Call (func=0x7f8be2cdd690, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#4 0x00007f8be3530d63 in g_initialstub (mark=0x7ffe6d1b1c88) at src/greenlet/greenlet.c:931 python-greenlet#5 0x00007f8be3530290 in g_switch (target=0x7f8be2cd6230, args=0x7f8be317f050, kwargs=0x0) at src/greenlet/greenlet.c:692 python-greenlet#6 0x00007f8be35329e2 in PyGreenlet_Switch (g=0x7f8be2cd6230, args=0x7f8be317f050, kwargs=0x0) at src/greenlet/greenlet.c:1806 <- first switch to G2 python-greenlet#7 0x00007f8be35294da in test_exception_switch_and_do_in_g2 (self=0x0, args=0x7f8be2ce33d0) <- this code runs in G1 at src/greenlet/tests/_test_extension_cpp.cpp:105 python-greenlet#8 0x00005584d039de7a in call_function (oparg=<optimized out>, pp_stack=0x7ffe6d1b1e28) at ../Python/ceval.c:4376 python-greenlet#9 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 python-greenlet#10 0x00005584d039c3cc in PyEval_EvalCodeEx (co=0x7f8be2cd9cb0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#11 0x00005584d03b6b9b in function_call (func=func@entry=0x7f8be2cde650, arg=0x7f8be317f050, kw=0x0) at ../Objects/funcobject.c:523 python-greenlet#12 0x00005584d0389903 in PyObject_Call (func=0x7f8be2cde650, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#13 0x00007f8be3530d63 in g_initialstub (mark=0x7ffe6d1b20b8) at src/greenlet/greenlet.c:931 python-greenlet#14 0x00007f8be3530290 in g_switch (target=0x7f8be2cd6410, args=0x7f8be317f050, kwargs=0x0) at src/greenlet/greenlet.c:692 python-greenlet#15 0x00007f8be3531c4c in green_switch (self=0x7f8be2cd6410, args=0x7f8be317f050, kwargs=0x0) at src/greenlet/greenlet.c:1321 <- switch to G1 ... The problem might be worked-around with putting try/catch on C-stack for every greenlet, but a more proper fix would be to unlink return address and C-stack-frame of created greenlet from other greenlets completely (i.e. rewrite first frame of C-stack for created greenlet to return to NULL). Thanks beforehand, Kirill P.S. The problem described at python-greenlet#197 (comment) and python-greenlet#205 might be related to hereby issue (/cc @ThePrez, @kadler, @jamadden). P.P.S. The test does not fail on master. I see there @jamadden switched the codebase to C++ almost completely and there is some explicit attempts to save/restore exception state added in python-greenlet@87edf955. However that exception save/restore is specific to Win32 and the test succeeds for me on Linux. I still see the following comment in UserGreenlet::inner_bootstrap // C++ exceptions cannot propagate to the parent greenlet from // here. (TODO: Do we need a catch(...) clause, perhaps on the // function itself? ALl we could do is terminate the program.) ( https://github.com/python-greenlet/greenlet/blob/3e534d6b/src/greenlet/greenlet.cpp#L1085-L1104 ) probably this indeed works only by luck, or due to G_NOEXCEPT modifier of UserGreenlet::inner_bootstrap upon seeing which __cxa_throw stops unwinding C-stack and just calls std::terminate. -------- Appendix I. C-level backtrace after the test died with SIGSEGV #0 0x0000556bdc30d394 in PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3351 python-greenlet#1 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a03acb0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#2 0x0000556bdc325b9b in function_call (func=func@entry=0x7f0b8a03f650, arg=0x7f0b8a4e0050, kw=0x0) at ../Objects/funcobject.c:523 python-greenlet#3 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a03f650, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#4 0x00007f0b8a891d63 in g_initialstub (mark=0x7ffc3ef97988) at src/greenlet/greenlet.c:931 python-greenlet#5 0x00007f0b8a891290 in g_switch (target=0x7f0b8a037410, args=0x7f0b8a4e0050, kwargs=0x0) at src/greenlet/greenlet.c:692 python-greenlet#6 0x00007f0b8a892c4c in green_switch (self=0x7f0b8a037410, args=0x7f0b8a4e0050, kwargs=0x0) at src/greenlet/greenlet.c:1321 python-greenlet#7 0x0000556bdc30ce7a in call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef97ac8) at ../Python/ceval.c:4376 python-greenlet#8 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 python-greenlet#9 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a03ad30, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#10 0x0000556bdc312953 in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7ffc3ef97ca8, func=0x7f0b8a03aed0) at ../Python/ceval.c:4471 python-greenlet#11 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef97ca8) at ../Python/ceval.c:4396 python-greenlet#12 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 python-greenlet#13 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a03ac30, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#14 0x0000556bdc312953 in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7ffc3ef97e88, func=0x7f0b8a03af50) at ../Python/ceval.c:4471 python-greenlet#15 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef97e88) at ../Python/ceval.c:4396 python-greenlet#16 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 python-greenlet#17 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a03adb0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#18 0x0000556bdc312953 in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7ffc3ef98068, func=0x7f0b8a03f250) at ../Python/ceval.c:4471 python-greenlet#19 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef98068) at ../Python/ceval.c:4396 python-greenlet#20 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 python-greenlet#21 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a04bd30, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x7f0b8a0752a8, defcount=1, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#22 0x0000556bdc325cc2 in function_call (func=0x7f0b8a0771d0, arg=0x7f0b8a3bd5a0, kw=0x7f0b8a042dd0) at ../Objects/funcobject.c:523 python-greenlet#23 0x0000556bdc30fa96 in PyObject_Call (kw=0x7f0b8a042dd0, arg=0x7f0b8a3bd5a0, func=0x7f0b8a0771d0) at ../Objects/abstract.c:2544 python-greenlet#24 ext_do_call (nk=<optimized out>, na=1, flags=<optimized out>, pp_stack=0x7ffc3ef982a0, func=0x7f0b8a0771d0) at ../Python/ceval.c:4690 python-greenlet#25 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3052 python-greenlet#26 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a04bf30, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#27 0x0000556bdc325b9b in function_call (func=0x7f0b8a0772d0, arg=arg@entry=0x7f0b8a3bd550, kw=kw@entry=0x0) at ../Objects/funcobject.c:523 python-greenlet#28 0x0000556bdc33f553 in PyObject_Call (kw=0x0, arg=0x7f0b8a3bd550, func=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#29 instancemethod_call (func=<optimized out>, func@entry=0x7f0b8a3c6a00, arg=0x7f0b8a3bd550, kw=0x0) at ../Objects/classobject.c:2600 python-greenlet#30 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a3c6a00, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#31 0x0000556bdc37eff8 in slot_tp_call (self=self@entry=0x7f0b8a03cfd0, args=0x7f0b8a044210, kwds=0x0) at ../Objects/typeobject.c:5609 python-greenlet#32 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a03cfd0, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#33 0x0000556bdc3128dd in do_call (nk=<optimized out>, na=<optimized out>, pp_stack=0x7ffc3ef98798, func=0x7f0b8a03cfd0) at ../Python/ceval.c:4593 python-greenlet#34 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef98798) at ../Python/ceval.c:4398 python-greenlet#35 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 python-greenlet#36 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a07d530, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x7f0b8a076ee8, defcount=1, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#37 0x0000556bdc325cc2 in function_call (func=0x7f0b8a07f950, arg=0x7f0b8a3bd780, kw=0x7f0b8a042cb0) at ../Objects/funcobject.c:523 python-greenlet#38 0x0000556bdc30fa96 in PyObject_Call (kw=0x7f0b8a042cb0, arg=0x7f0b8a3bd780, func=0x7f0b8a07f950) at ../Objects/abstract.c:2544 python-greenlet#39 ext_do_call (nk=<optimized out>, na=1, flags=<optimized out>, pp_stack=0x7ffc3ef989d0, func=0x7f0b8a07f950) at ../Python/ceval.c:4690 python-greenlet#40 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3052 python-greenlet#41 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a07d2b0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#42 0x0000556bdc325b9b in function_call (func=0x7f0b8a07f850, arg=arg@entry=0x7f0b8a3bd730, kw=kw@entry=0x0) at ../Objects/funcobject.c:523 python-greenlet#43 0x0000556bdc33f553 in PyObject_Call (kw=0x0, arg=0x7f0b8a3bd730, func=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#44 instancemethod_call (func=<optimized out>, func@entry=0x7f0b8a427190, arg=0x7f0b8a3bd730, kw=0x0) at ../Objects/classobject.c:2600 python-greenlet#45 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a427190, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#46 0x0000556bdc37eff8 in slot_tp_call (self=self@entry=0x7f0b8a03cf90, args=0x7f0b8a044150, kwds=0x0) at ../Objects/typeobject.c:5609 python-greenlet#47 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a03cf90, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#48 0x0000556bdc3128dd in do_call (nk=<optimized out>, na=<optimized out>, pp_stack=0x7ffc3ef98ec8, func=0x7f0b8a03cf90) at ../Python/ceval.c:4593 python-greenlet#49 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef98ec8) at ../Python/ceval.c:4398 python-greenlet#50 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 python-greenlet#51 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a07d530, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x7f0b8a076ee8, defcount=1, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#52 0x0000556bdc325cc2 in function_call (func=0x7f0b8a07f950, arg=0x7f0b8a3bdaf0, kw=0x7f0b8a042b90) at ../Objects/funcobject.c:523 python-greenlet#53 0x0000556bdc30fa96 in PyObject_Call (kw=0x7f0b8a042b90, arg=0x7f0b8a3bdaf0, func=0x7f0b8a07f950) at ../Objects/abstract.c:2544 python-greenlet#54 ext_do_call (nk=<optimized out>, na=1, flags=<optimized out>, pp_stack=0x7ffc3ef99100, func=0x7f0b8a07f950) at ../Python/ceval.c:4690 python-greenlet#55 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3052 python-greenlet#56 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a07d2b0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#57 0x0000556bdc325b9b in function_call (func=0x7f0b8a07f850, arg=arg@entry=0x7f0b8a3bdb40, kw=kw@entry=0x0) at ../Objects/funcobject.c:523 python-greenlet#58 0x0000556bdc33f553 in PyObject_Call (kw=0x0, arg=0x7f0b8a3bdb40, func=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#59 instancemethod_call (func=<optimized out>, func@entry=0x7f0b8a3c6820, arg=0x7f0b8a3bdb40, kw=0x0) at ../Objects/classobject.c:2600 python-greenlet#60 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a3c6820, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#61 0x0000556bdc37eff8 in slot_tp_call (self=self@entry=0x7f0b8a033c50, args=0x7f0b8a03c0d0, kwds=0x0) at ../Objects/typeobject.c:5609 python-greenlet#62 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a033c50, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#63 0x0000556bdc3128dd in do_call (nk=<optimized out>, na=<optimized out>, pp_stack=0x7ffc3ef995f8, func=0x7f0b8a033c50) at ../Python/ceval.c:4593 python-greenlet#64 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef995f8) at ../Python/ceval.c:4398 python-greenlet#65 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 python-greenlet#66 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a07d530, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x7f0b8a076ee8, defcount=1, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#67 0x0000556bdc325cc2 in function_call (func=0x7f0b8a07f950, arg=0x7f0b8a3bd500, kw=0x7f0b8a042a70) at ../Objects/funcobject.c:523 python-greenlet#68 0x0000556bdc30fa96 in PyObject_Call (kw=0x7f0b8a042a70, arg=0x7f0b8a3bd500, func=0x7f0b8a07f950) at ../Objects/abstract.c:2544 python-greenlet#69 ext_do_call (nk=<optimized out>, na=1, flags=<optimized out>, pp_stack=0x7ffc3ef99830, func=0x7f0b8a07f950) at ../Python/ceval.c:4690 python-greenlet#70 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3052 python-greenlet#71 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a07d2b0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#72 0x0000556bdc325b9b in function_call (func=0x7f0b8a07f850, arg=arg@entry=0x7f0b8a3bd9b0, kw=kw@entry=0x0) at ../Objects/funcobject.c:523 python-greenlet#73 0x0000556bdc33f553 in PyObject_Call (kw=0x0, arg=0x7f0b8a3bd9b0, func=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#74 instancemethod_call (func=<optimized out>, func@entry=0x7f0b8a4310a0, arg=0x7f0b8a3bd9b0, kw=0x0) at ../Objects/classobject.c:2600 python-greenlet#75 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a4310a0, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#76 0x0000556bdc37eff8 in slot_tp_call (self=self@entry=0x7f0b8a033c10, args=0x7f0b8a033fd0, kwds=0x0) at ../Objects/typeobject.c:5609 python-greenlet#77 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a033c10, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#78 0x0000556bdc3128dd in do_call (nk=<optimized out>, na=<optimized out>, pp_stack=0x7ffc3ef99d28, func=0x7f0b8a033c10) at ../Python/ceval.c:4593 python-greenlet#79 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef99d28) at ../Python/ceval.c:4398 python-greenlet#80 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 python-greenlet#81 0x0000556bdc3125fe in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7ffc3ef99e38, func=0x7f0b8a01ecd0) at ../Python/ceval.c:4461 python-greenlet#82 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef99e38) at ../Python/ceval.c:4396 python-greenlet#83 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 python-greenlet#84 0x0000556bdc3125fe in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7ffc3ef99f48, func=0x7f0b8a01edd0) at ../Python/ceval.c:4461 python-greenlet#85 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef99f48) at ../Python/ceval.c:4396 python-greenlet#86 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 python-greenlet#87 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a081d30, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=1, defs=0x7f0b8a008ba8, defcount=10, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#88 0x0000556bdc325cc2 in function_call (func=0x7f0b8a00ddd0, arg=arg@entry=0x7f0b8a033610, kw=kw@entry=0x7f0b8a014a70) at ../Objects/funcobject.c:523 python-greenlet#89 0x0000556bdc33f553 in PyObject_Call (kw=0x7f0b8a014a70, arg=0x7f0b8a033610, func=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#90 instancemethod_call (func=<optimized out>, func@entry=0x7f0b8a427140, arg=0x7f0b8a033610, arg@entry=0x7f0b8a4e0050, kw=kw@entry=0x7f0b8a014a70) at ../Objects/classobject.c:2600 python-greenlet#91 0x0000556bdc33f10f in PyObject_Call (kw=0x7f0b8a014a70, arg=0x7f0b8a4e0050, func=0x7f0b8a427140) at ../Objects/abstract.c:2544 python-greenlet#92 slot_tp_init (self=self@entry=0x7f0b8a3ebb10, args=args@entry=0x7f0b8a4e0050, kwds=kwds@entry=0x7f0b8a014a70) at ../Objects/typeobject.c:5869 python-greenlet#93 0x0000556bdc2feb87 in type_call (type=<optimized out>, type@entry=0x556bdd2a85c0, args=0x7f0b8a4e0050, kwds=0x7f0b8a014a70) at ../Objects/typeobject.c:765 python-greenlet#94 0x0000556bdc2f8903 in PyObject_Call (func=0x556bdd2a85c0, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#95 0x0000556bdc3128dd in do_call (nk=<optimized out>, na=<optimized out>, pp_stack=0x7ffc3ef9a458, func=0x556bdd2a85c0) at ../Python/ceval.c:4593 python-greenlet#96 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef9a458) at ../Python/ceval.c:4398 python-greenlet#97 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 python-greenlet#98 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a37d830, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#99 0x0000556bdc311886 in PyEval_EvalCode (locals=0x7f0b8a4ae170, globals=0x7f0b8a4ae170, co=<optimized out>) at ../Python/ceval.c:669 python-greenlet#100 exec_statement (locals=0x7f0b8a4ae170, globals=0x7f0b8a4ae170, prog=<optimized out>, f=<optimized out>) at ../Python/ceval.c:5093 python-greenlet#101 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:2122 python-greenlet#102 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a3ea4b0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x7f0b8a381068, defcount=5, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#103 0x0000556bdc312953 in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7ffc3ef9a818, func=0x7f0b8a37d8d0) at ../Python/ceval.c:4471 python-greenlet#104 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef9a818) at ../Python/ceval.c:4396 python-greenlet#105 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 python-greenlet#106 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a37d4b0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x7f0b8a379ce8, defcount=1, closure=0x0) at ../Python/ceval.c:3608 python-greenlet#107 0x0000556bdc325b9b in function_call (func=func@entry=0x7f0b8a37de50, arg=0x7f0b8a3b5be0, kw=0x0) at ../Objects/funcobject.c:523 python-greenlet#108 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a37de50, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 python-greenlet#109 0x0000556bdc3b87e1 in RunModule (module=<optimized out>, set_argv0=1) at ../Modules/main.c:197 python-greenlet#110 0x0000556bdc3a68ed in Py_Main (argc=<optimized out>, argv=<optimized out>) at ../Modules/main.c:592#111 0x00007f0b8a54bd0a in __libc_start_main (main=0x556bdc3a6530 <main>, argc=5, argv=0x7ffc3ef9ac08, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc3ef9abf8) at ../csu/libc-start.c:308 python-greenlet#112 0x0000556bdc3a646a in _start ()
jamadden
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…opagate to another greenlet and corrupt memory Hello up there. While working on Pygolang I've faced the following problem: a C++ exception thrown in one greenlet, without any try/catch block on that greenlet, might become propagated and "handled" by try/catch block established at another greenlet that happened to switch to the greenlet in question. "Handled" comes in quotes because the program usually segfaults after that. I've also observed segfaults before exception reaches user-level try/catch block - internally in __cxa_throw. Both this issues are likely of the same origin - due to the fact that C-level stack of a greenlet does not start from scratch and starts from C-level stack of the program state when the greenlet is switched to the first time. We already have one test for C++ exception handling in test_cpp that @snaury initially added in d9cb12a. However in that test all greenlets that throw C++ exceptions also put try/catch at the top of their C-stack. In the problem, that I describe, and that added test reproduces, there is no intended top-level try/catch block in C-stack of the greenlet in question that throws. As the test shows the exception becomes propagated to switcher's greenlet context and the program then dies with SIGSEGV: test_exception_switch_and_throw (greenlet.tests.test_cpp.CPPTests) ... terminate called after throwing an instance of 'exception_t' C++ exception unexpectedly caught in g1 <-- NOTE FAIL ====================================================================== FAIL: test_exception_switch_and_throw (greenlet.tests.test_cpp.CPPTests) ---------------------------------------------------------------------- Traceback (most recent call last): File "/home/kirr/src/tools/py/gevent/greenlet/src/greenlet/tests/test_cpp.py", line 62, in test_exception_switch_and_throw (ret, sig, " (core dumped)" if core else "")) AssertionError: failed with ret=0 sig=11 (core dumped) The C-level backtrace from the dumped core is attached in Appendix I. There the program dies somehow after running the code from _test_extension_cpp.cpp module. However with the following dirty-patch the situation becomes more clear: --- a/src/greenlet/tests/_test_extension_cpp.cpp +++ b/src/greenlet/tests/_test_extension_cpp.cpp @@ -70,6 +70,7 @@ test_exception_switch(PyObject* self, PyObject* args) static PyObject* py_test_exception_throw(PyObject* self, PyObject* args) { + abort(); if (!PyArg_ParseTuple(args, "")) return NULL; p_test_exception_throw(0); The C-level backtrace of this abort when, run from under g2, shows that g2 C-stack starts from what was there before for first greenlet with try/catch block: #0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50 #1 0x00007f8be31e9537 in __GI_abort () at abort.c:79 #2 0x00007f8be3529423 in py_test_exception_throw (self=0x0, args=0x7f8be317f050) at src/greenlet/tests/_test_extension_cpp.cpp:73 #3 0x00005584d0389903 in PyObject_Call (func=0x7f8be2cdd690, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 #4 0x00007f8be3530d63 in g_initialstub (mark=0x7ffe6d1b1c88) at src/greenlet/greenlet.c:931 #5 0x00007f8be3530290 in g_switch (target=0x7f8be2cd6230, args=0x7f8be317f050, kwargs=0x0) at src/greenlet/greenlet.c:692 #6 0x00007f8be35329e2 in PyGreenlet_Switch (g=0x7f8be2cd6230, args=0x7f8be317f050, kwargs=0x0) at src/greenlet/greenlet.c:1806 <- first switch to G2 #7 0x00007f8be35294da in test_exception_switch_and_do_in_g2 (self=0x0, args=0x7f8be2ce33d0) <- this code runs in G1 at src/greenlet/tests/_test_extension_cpp.cpp:105 #8 0x00005584d039de7a in call_function (oparg=<optimized out>, pp_stack=0x7ffe6d1b1e28) at ../Python/ceval.c:4376 #9 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 #10 0x00005584d039c3cc in PyEval_EvalCodeEx (co=0x7f8be2cd9cb0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 #11 0x00005584d03b6b9b in function_call (func=func@entry=0x7f8be2cde650, arg=0x7f8be317f050, kw=0x0) at ../Objects/funcobject.c:523 #12 0x00005584d0389903 in PyObject_Call (func=0x7f8be2cde650, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 #13 0x00007f8be3530d63 in g_initialstub (mark=0x7ffe6d1b20b8) at src/greenlet/greenlet.c:931 #14 0x00007f8be3530290 in g_switch (target=0x7f8be2cd6410, args=0x7f8be317f050, kwargs=0x0) at src/greenlet/greenlet.c:692 #15 0x00007f8be3531c4c in green_switch (self=0x7f8be2cd6410, args=0x7f8be317f050, kwargs=0x0) at src/greenlet/greenlet.c:1321 <- switch to G1 ... The problem might be worked-around with putting try/catch on C-stack for every greenlet, but a more proper fix would be to unlink return address and C-stack-frame of created greenlet from other greenlets completely (i.e. rewrite first frame of C-stack for created greenlet to return to NULL). Thanks beforehand, Kirill P.S. The problem described at #197 (comment) and #205 might be related to hereby issue (/cc @ThePrez, @kadler, @jamadden). P.P.S. The test does not fail on master. I see there @jamadden switched the codebase to C++ almost completely and there is some explicit attempts to save/restore exception state added in 87edf955. However that exception save/restore is specific to Win32 and the test succeeds for me on Linux. I still see the following comment in UserGreenlet::inner_bootstrap // C++ exceptions cannot propagate to the parent greenlet from // here. (TODO: Do we need a catch(...) clause, perhaps on the // function itself? ALl we could do is terminate the program.) ( https://github.com/python-greenlet/greenlet/blob/3e534d6b/src/greenlet/greenlet.cpp#L1085-L1104 ) probably this indeed works only by luck, or due to G_NOEXCEPT modifier of UserGreenlet::inner_bootstrap upon seeing which __cxa_throw stops unwinding C-stack and just calls std::terminate. -------- Appendix I. C-level backtrace after the test died with SIGSEGV #0 0x0000556bdc30d394 in PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3351 #1 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a03acb0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 #2 0x0000556bdc325b9b in function_call (func=func@entry=0x7f0b8a03f650, arg=0x7f0b8a4e0050, kw=0x0) at ../Objects/funcobject.c:523 #3 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a03f650, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 #4 0x00007f0b8a891d63 in g_initialstub (mark=0x7ffc3ef97988) at src/greenlet/greenlet.c:931 #5 0x00007f0b8a891290 in g_switch (target=0x7f0b8a037410, args=0x7f0b8a4e0050, kwargs=0x0) at src/greenlet/greenlet.c:692 #6 0x00007f0b8a892c4c in green_switch (self=0x7f0b8a037410, args=0x7f0b8a4e0050, kwargs=0x0) at src/greenlet/greenlet.c:1321 #7 0x0000556bdc30ce7a in call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef97ac8) at ../Python/ceval.c:4376 #8 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 #9 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a03ad30, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 #10 0x0000556bdc312953 in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7ffc3ef97ca8, func=0x7f0b8a03aed0) at ../Python/ceval.c:4471 #11 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef97ca8) at ../Python/ceval.c:4396 #12 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 #13 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a03ac30, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 #14 0x0000556bdc312953 in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7ffc3ef97e88, func=0x7f0b8a03af50) at ../Python/ceval.c:4471 #15 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef97e88) at ../Python/ceval.c:4396 #16 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 #17 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a03adb0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 #18 0x0000556bdc312953 in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7ffc3ef98068, func=0x7f0b8a03f250) at ../Python/ceval.c:4471 #19 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef98068) at ../Python/ceval.c:4396 #20 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 #21 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a04bd30, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x7f0b8a0752a8, defcount=1, closure=0x0) at ../Python/ceval.c:3608 #22 0x0000556bdc325cc2 in function_call (func=0x7f0b8a0771d0, arg=0x7f0b8a3bd5a0, kw=0x7f0b8a042dd0) at ../Objects/funcobject.c:523 #23 0x0000556bdc30fa96 in PyObject_Call (kw=0x7f0b8a042dd0, arg=0x7f0b8a3bd5a0, func=0x7f0b8a0771d0) at ../Objects/abstract.c:2544 #24 ext_do_call (nk=<optimized out>, na=1, flags=<optimized out>, pp_stack=0x7ffc3ef982a0, func=0x7f0b8a0771d0) at ../Python/ceval.c:4690 #25 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3052 #26 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a04bf30, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 #27 0x0000556bdc325b9b in function_call (func=0x7f0b8a0772d0, arg=arg@entry=0x7f0b8a3bd550, kw=kw@entry=0x0) at ../Objects/funcobject.c:523 #28 0x0000556bdc33f553 in PyObject_Call (kw=0x0, arg=0x7f0b8a3bd550, func=<optimized out>) at ../Objects/abstract.c:2544 #29 instancemethod_call (func=<optimized out>, func@entry=0x7f0b8a3c6a00, arg=0x7f0b8a3bd550, kw=0x0) at ../Objects/classobject.c:2600 #30 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a3c6a00, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 #31 0x0000556bdc37eff8 in slot_tp_call (self=self@entry=0x7f0b8a03cfd0, args=0x7f0b8a044210, kwds=0x0) at ../Objects/typeobject.c:5609 #32 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a03cfd0, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 #33 0x0000556bdc3128dd in do_call (nk=<optimized out>, na=<optimized out>, pp_stack=0x7ffc3ef98798, func=0x7f0b8a03cfd0) at ../Python/ceval.c:4593 #34 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef98798) at ../Python/ceval.c:4398 #35 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 #36 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a07d530, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x7f0b8a076ee8, defcount=1, closure=0x0) at ../Python/ceval.c:3608 #37 0x0000556bdc325cc2 in function_call (func=0x7f0b8a07f950, arg=0x7f0b8a3bd780, kw=0x7f0b8a042cb0) at ../Objects/funcobject.c:523 #38 0x0000556bdc30fa96 in PyObject_Call (kw=0x7f0b8a042cb0, arg=0x7f0b8a3bd780, func=0x7f0b8a07f950) at ../Objects/abstract.c:2544 #39 ext_do_call (nk=<optimized out>, na=1, flags=<optimized out>, pp_stack=0x7ffc3ef989d0, func=0x7f0b8a07f950) at ../Python/ceval.c:4690 #40 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3052 #41 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a07d2b0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 #42 0x0000556bdc325b9b in function_call (func=0x7f0b8a07f850, arg=arg@entry=0x7f0b8a3bd730, kw=kw@entry=0x0) at ../Objects/funcobject.c:523 #43 0x0000556bdc33f553 in PyObject_Call (kw=0x0, arg=0x7f0b8a3bd730, func=<optimized out>) at ../Objects/abstract.c:2544 #44 instancemethod_call (func=<optimized out>, func@entry=0x7f0b8a427190, arg=0x7f0b8a3bd730, kw=0x0) at ../Objects/classobject.c:2600 #45 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a427190, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 #46 0x0000556bdc37eff8 in slot_tp_call (self=self@entry=0x7f0b8a03cf90, args=0x7f0b8a044150, kwds=0x0) at ../Objects/typeobject.c:5609 #47 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a03cf90, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 #48 0x0000556bdc3128dd in do_call (nk=<optimized out>, na=<optimized out>, pp_stack=0x7ffc3ef98ec8, func=0x7f0b8a03cf90) at ../Python/ceval.c:4593 #49 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef98ec8) at ../Python/ceval.c:4398 #50 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 #51 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a07d530, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x7f0b8a076ee8, defcount=1, closure=0x0) at ../Python/ceval.c:3608 #52 0x0000556bdc325cc2 in function_call (func=0x7f0b8a07f950, arg=0x7f0b8a3bdaf0, kw=0x7f0b8a042b90) at ../Objects/funcobject.c:523 #53 0x0000556bdc30fa96 in PyObject_Call (kw=0x7f0b8a042b90, arg=0x7f0b8a3bdaf0, func=0x7f0b8a07f950) at ../Objects/abstract.c:2544 #54 ext_do_call (nk=<optimized out>, na=1, flags=<optimized out>, pp_stack=0x7ffc3ef99100, func=0x7f0b8a07f950) at ../Python/ceval.c:4690 #55 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3052 #56 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a07d2b0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 #57 0x0000556bdc325b9b in function_call (func=0x7f0b8a07f850, arg=arg@entry=0x7f0b8a3bdb40, kw=kw@entry=0x0) at ../Objects/funcobject.c:523 #58 0x0000556bdc33f553 in PyObject_Call (kw=0x0, arg=0x7f0b8a3bdb40, func=<optimized out>) at ../Objects/abstract.c:2544 #59 instancemethod_call (func=<optimized out>, func@entry=0x7f0b8a3c6820, arg=0x7f0b8a3bdb40, kw=0x0) at ../Objects/classobject.c:2600 #60 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a3c6820, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 #61 0x0000556bdc37eff8 in slot_tp_call (self=self@entry=0x7f0b8a033c50, args=0x7f0b8a03c0d0, kwds=0x0) at ../Objects/typeobject.c:5609 #62 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a033c50, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 #63 0x0000556bdc3128dd in do_call (nk=<optimized out>, na=<optimized out>, pp_stack=0x7ffc3ef995f8, func=0x7f0b8a033c50) at ../Python/ceval.c:4593 #64 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef995f8) at ../Python/ceval.c:4398 #65 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 #66 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a07d530, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x7f0b8a076ee8, defcount=1, closure=0x0) at ../Python/ceval.c:3608 #67 0x0000556bdc325cc2 in function_call (func=0x7f0b8a07f950, arg=0x7f0b8a3bd500, kw=0x7f0b8a042a70) at ../Objects/funcobject.c:523 #68 0x0000556bdc30fa96 in PyObject_Call (kw=0x7f0b8a042a70, arg=0x7f0b8a3bd500, func=0x7f0b8a07f950) at ../Objects/abstract.c:2544 #69 ext_do_call (nk=<optimized out>, na=1, flags=<optimized out>, pp_stack=0x7ffc3ef99830, func=0x7f0b8a07f950) at ../Python/ceval.c:4690 #70 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3052 #71 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a07d2b0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 #72 0x0000556bdc325b9b in function_call (func=0x7f0b8a07f850, arg=arg@entry=0x7f0b8a3bd9b0, kw=kw@entry=0x0) at ../Objects/funcobject.c:523 #73 0x0000556bdc33f553 in PyObject_Call (kw=0x0, arg=0x7f0b8a3bd9b0, func=<optimized out>) at ../Objects/abstract.c:2544 #74 instancemethod_call (func=<optimized out>, func@entry=0x7f0b8a4310a0, arg=0x7f0b8a3bd9b0, kw=0x0) at ../Objects/classobject.c:2600 #75 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a4310a0, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 #76 0x0000556bdc37eff8 in slot_tp_call (self=self@entry=0x7f0b8a033c10, args=0x7f0b8a033fd0, kwds=0x0) at ../Objects/typeobject.c:5609 #77 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a033c10, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 #78 0x0000556bdc3128dd in do_call (nk=<optimized out>, na=<optimized out>, pp_stack=0x7ffc3ef99d28, func=0x7f0b8a033c10) at ../Python/ceval.c:4593 #79 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef99d28) at ../Python/ceval.c:4398 #80 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 #81 0x0000556bdc3125fe in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7ffc3ef99e38, func=0x7f0b8a01ecd0) at ../Python/ceval.c:4461 #82 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef99e38) at ../Python/ceval.c:4396 #83 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 #84 0x0000556bdc3125fe in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7ffc3ef99f48, func=0x7f0b8a01edd0) at ../Python/ceval.c:4461 #85 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef99f48) at ../Python/ceval.c:4396 #86 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 #87 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a081d30, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=1, defs=0x7f0b8a008ba8, defcount=10, closure=0x0) at ../Python/ceval.c:3608 #88 0x0000556bdc325cc2 in function_call (func=0x7f0b8a00ddd0, arg=arg@entry=0x7f0b8a033610, kw=kw@entry=0x7f0b8a014a70) at ../Objects/funcobject.c:523 #89 0x0000556bdc33f553 in PyObject_Call (kw=0x7f0b8a014a70, arg=0x7f0b8a033610, func=<optimized out>) at ../Objects/abstract.c:2544 #90 instancemethod_call (func=<optimized out>, func@entry=0x7f0b8a427140, arg=0x7f0b8a033610, arg@entry=0x7f0b8a4e0050, kw=kw@entry=0x7f0b8a014a70) at ../Objects/classobject.c:2600 #91 0x0000556bdc33f10f in PyObject_Call (kw=0x7f0b8a014a70, arg=0x7f0b8a4e0050, func=0x7f0b8a427140) at ../Objects/abstract.c:2544 #92 slot_tp_init (self=self@entry=0x7f0b8a3ebb10, args=args@entry=0x7f0b8a4e0050, kwds=kwds@entry=0x7f0b8a014a70) at ../Objects/typeobject.c:5869 #93 0x0000556bdc2feb87 in type_call (type=<optimized out>, type@entry=0x556bdd2a85c0, args=0x7f0b8a4e0050, kwds=0x7f0b8a014a70) at ../Objects/typeobject.c:765 #94 0x0000556bdc2f8903 in PyObject_Call (func=0x556bdd2a85c0, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 #95 0x0000556bdc3128dd in do_call (nk=<optimized out>, na=<optimized out>, pp_stack=0x7ffc3ef9a458, func=0x556bdd2a85c0) at ../Python/ceval.c:4593 #96 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef9a458) at ../Python/ceval.c:4398 #97 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 #98 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a37d830, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) at ../Python/ceval.c:3608 #99 0x0000556bdc311886 in PyEval_EvalCode (locals=0x7f0b8a4ae170, globals=0x7f0b8a4ae170, co=<optimized out>) at ../Python/ceval.c:669 #100 exec_statement (locals=0x7f0b8a4ae170, globals=0x7f0b8a4ae170, prog=<optimized out>, f=<optimized out>) at ../Python/ceval.c:5093 #101 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:2122 #102 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a3ea4b0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x7f0b8a381068, defcount=5, closure=0x0) at ../Python/ceval.c:3608 #103 0x0000556bdc312953 in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7ffc3ef9a818, func=0x7f0b8a37d8d0) at ../Python/ceval.c:4471 #104 call_function (oparg=<optimized out>, pp_stack=0x7ffc3ef9a818) at ../Python/ceval.c:4396 #105 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3013 #106 0x0000556bdc30b3cc in PyEval_EvalCodeEx (co=0x7f0b8a37d4b0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x7f0b8a379ce8, defcount=1, closure=0x0) at ../Python/ceval.c:3608 #107 0x0000556bdc325b9b in function_call (func=func@entry=0x7f0b8a37de50, arg=0x7f0b8a3b5be0, kw=0x0) at ../Objects/funcobject.c:523 #108 0x0000556bdc2f8903 in PyObject_Call (func=0x7f0b8a37de50, arg=<optimized out>, kw=<optimized out>) at ../Objects/abstract.c:2544 #109 0x0000556bdc3b87e1 in RunModule (module=<optimized out>, set_argv0=1) at ../Modules/main.c:197 #110 0x0000556bdc3a68ed in Py_Main (argc=<optimized out>, argv=<optimized out>) at ../Modules/main.c:592#111 0x00007f0b8a54bd0a in __libc_start_main (main=0x556bdc3a6530 <main>, argc=5, argv=0x7ffc3ef9ac08, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc3ef9abf8) at ../csu/libc-start.c:308 #112 0x0000556bdc3a646a in _start ()
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Compiling greenlet with gcc 3.2 (RHEL3) no longer works. The assembler generated by for calling the functions by pointers is different then from the 0.3.1 release but I can't figure out why. Also to my untrained eye both generated assembler files seem like they should work.
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