Correct output of debug info

[m-hemmings]

Motivation

Deterministic tests in scripts/wasmtestreport.py compare expected/native output against WASM output exactly.

When lind_debug is enabled, host-side runtime diagnostics such as:

• [LIND DEBUG NUM]: 0
• [LIND DEBUG STR]: LIND DEGUG INIT

are emitted on stderr.

Previously, successful WASM execution returned stdout + stderr, which polluted deterministic comparisons and produced false Output_mismatch failures even when the program behavior was correct.

What changed

In run_compiled_wasm():

• If returncode == 0, the function now returns stdout only.
• If returncode != 0, the function still returns stdout + stderr to preserve debugging context for real failures.
• Timeout and exception handling behavior is unchanged.

Impact

• Fixes false negatives in deterministic tests when debug logging is enabled.
• Does not hide diagnostics for compile/runtime failures.

[github-actions]

End-to-End Test Report

Test Preview

Test Report

Deterministic Tests

Summary

Metric	Count
Total Test Cases	149
Number of Successes	149
Number of Failures	0
Number of Compilation Failure Native	0
Number of Runtime Failure Native	0
Number of Segmentation Fault Native	0
Number of Timeout During Native	0
Number of Lind Wasm Compile Failure	0
Number of Lind Wasm Runtime Failure	0
Number of Lind Wasm Segmentation Failure	0
Number of Timeout During Lind Wasm run	0
Number of Unknown Failure	0
Number of C Compiler and Wasm Output mismatch	0
Number of Fail Test: Native Succeeded (Should Fail)	0
Number of Fail Test: Wasm Succeeded (Should Fail)	0
Number of Fail Test: Both Native and Wasm Succeeded (Should Fail)	0
Number of Fail Test: Native Compilation Failure (Should Succeed)	0
Number of Fail Test: Wasm Compilation Failure (Should Succeed)	0

Test Results by Category

Test Case	Status	Error Type	Native Time	Wasm Time	Output
File Tests
chartests.c	Success	None	0.051347s	4.260759s	Success
chdir_getcwd.c	Success	None	0.050128s	4.230722s	Success
chmod.c	Success	None	0.055761s	4.210215s	Success
clock_gettime_highlevel.c	Success	None	0.121102s	4.403374s	Success
clock_gettime_simple.c	Success	None	0.044777s	4.184698s	Success
cloexec.c	Success	None	0.054468s	5.237627s	Success
close.c	Success	None	0.064178s	4.257893s	Success
creat_access.c	Success	None	0.053682s	4.206448s	Success
doubleclose.c	Success	None	0.046277s	3.792817s	Success
dup.c	Success	None	0.046604s	4.198536s	Success
dup2.c	Success	None	0.052718s	3.848148s	Success
dup3.c	Success	None	0.052438s	4.263885s	Success
dupwrite.c	Success	None	0.053679s	3.806466s	Success
fchdir.c	Success	None	0.056929s	4.218912s	Success
fchmod.c	Success	None	0.058633s	4.195290s	Success
fcntl.c	Success	None	0.054241s	4.201035s	Success
fdatasync.c	Success	None	0.051952s	4.180432s	Success
filetest.c	Success	None	0.052801s	3.815637s	Success
filetest1000.c	Success	None	0.061477s	3.821962s	Success
flock.c	Success	None	0.061654s	4.277524s	Success
fstat.c	Success	None	0.056929s	4.212203s	Success
fstatfs.c	Success	None	0.047334s	4.173497s	Success
fsync.c	Success	None	0.051706s	4.189942s	Success
ftruncate.c	Success	None	0.058078s	4.259521s	Success
getcwd.c	Success	None	0.050749s	4.245371s	Success
getrandom.c	Success	None	0.053187s	4.225819s	Success
ioctl.c	Success	None	0.057705s	4.191678s	Success
link.c	Success	None	0.056578s	4.232334s	Success
lseek.c	Success	None	0.057895s	4.272264s	Success
mkdir_rmdir.c	Success	None	0.055262s	4.210522s	Success
open.c	Success	None	0.047400s	4.158236s	Success
pread_pwrite.c	Success	None	0.050476s	4.182715s	Success
printf.c	Success	None	0.045164s	3.808202s	Success
read.c	Success	None	0.053798s	4.173425s	Success
readbytes.c	Success	None	0.050181s	3.830541s	Success
readlink.c	Success	None	0.053951s	4.199692s	Success
readlinkat.c	Success	None	0.055462s	4.184459s	Success
rename.c	Success	None	0.056729s	4.194025s	Success
sc-writev.c	Success	None	0.052020s	4.181959s	Success
stat.c	Success	None	0.055020s	4.194409s	Success
statfs.c	Success	None	0.048784s	4.174783s	Success
sync_file_range.c	Success	None	0.050770s	4.221106s	Success
truncate.c	Success	None	0.056918s	4.249992s	Success
unlink.c	Success	None	0.055581s	4.219158s	Success
unlinkat.c	Success	None	0.055120s	4.230089s	Success
write.c	Success	None	0.047154s	3.804788s	Success
writeloop.c	Success	None	0.057230s	3.802715s	Success
writepartial.c	Success	None	0.053899s	3.813142s	Success
writev.c	Success	None	0.055422s	4.224170s	Success
Math Tests
math_link_smoke.c	Success	None	0.056543s	3.843490s	Success
math_tests.c	Success	None	0.060291s	3.998795s	Success
Memory Tests
brk.c	Success	None	0.050924s	4.202455s	Success
malloc.c	Success	None	0.048900s	3.802582s	Success
malloc_large.c	Success	None	0.050142s	4.179936s	Success
memcpy.c	Success	None	0.048559s	3.776538s	Success
memory_error_test.c	Success	None	0.055960s	4.214605s	Success
mmap.c	Success	None	0.046078s	4.171956s	Success
mmap_aligned.c	Success	None	0.049320s	4.201695s	Success
mmap_complicated.c	Success	None	0.052874s	4.245583s	Success
mmap_file.c	Success	None	0.053897s	4.192592s	Success
mmap_shared.c	Success	None	0.052737s	4.211867s	Success
mmaptest.c	Success	None	0.049577s	4.224077s	Success
mprotect.c	Success	None	0.046928s	4.179021s	Success
mprotect_boundary.c	Success	None	0.048060s	4.193199s	Success
mprotect_end_region.c	Success	None	0.047196s	4.172277s	Success
mprotect_middle_region.c	Success	None	0.047012s	4.187056s	Success
mprotect_multiple_times.c	Success	None	0.047972s	4.193797s	Success
mprotect_same_value.c	Success	None	0.047637s	4.206315s	Success
mprotect_spanning_regions.c	Success	None	0.048669s	4.183746s	Success
sbrk.c	Success	None	0.049153s	4.208394s	Success
segfault.c	Success	None	0.056774s	4.219559s	Success
shm.c	Success	None	0.054289s	4.245677s	Success
shmtest.c	Success	None	0.047796s	4.200931s	Success
vtable.c	Success	None	0.063328s	3.850936s	Success
Networking Tests
dnstest.c	Success	None	0.054490s	4.269632s	Success
epollcreate1.c	Success	None	0.058130s	4.279028s	Success
gethostname.c	Success	None	0.048600s	3.835842s	Success
getsockname.c	Success	None	0.056863s	4.230834s	Success
getsockopt.c	Success	None	0.058387s	4.245374s	Success
makepipe.c	Success	None	0.046909s	3.795819s	Success
pipe.c	Success	None	0.058536s	4.265664s	Success
pipe2.c	Success	None	0.055712s	4.184431s	Success
pipeinput.c	Success	None	0.057024s	4.261736s	Success
pipeinput2.c	Success	None	0.057682s	4.261025s	Success
pipeonestring.c	Success	None	0.059653s	4.282823s	Success
pipepong.c	Success	None	0.056901s	4.263107s	Success
pipewrite.c	Success	None	0.052116s	4.255431s	Success
poll.c	Success	None	0.055403s	4.216366s	Success
recvfrom-sendto.c	Success	None	0.056242s	4.219493s	Success
serverclient.c	Success	None	0.057273s	3.879576s	Success
shutdown.c	Success	None	0.058825s	3.881687s	Success
shutdown_fork.c	Success	None	0.056775s	4.224935s	Success
simple-select.c	Success	None	0.059611s	4.265161s	Success
simple_epoll.c	Success	None	0.055359s	4.233703s	Success
socket.c	Success	None	0.058402s	3.865850s	Success
socket_cloexec.c	Success	None	0.053280s	4.217123s	Success
socketepoll.c	Success	None	0.054396s	3.835789s	Success
socketpair.c	Success	None	0.054049s	4.286818s	Success
socketselect.c	Success	None	0.054370s	4.222615s	Success
tcp_connect_single.c	Success	None	0.056268s	4.234635s	Success
uds-getsockname.c	Success	None	0.055380s	4.213334s	Success
uds-socketselect.c	Success	None	0.055273s	3.847802s	Success
Process Tests
chain_thread.c	Success	None	1.056495s	5.365212s	Success
exit.c	Success	None	0.053378s	3.787264s	Success
fork2malloc.c	Success	None	0.056147s	4.233491s	Success
fork_select.c	Success	None	0.053333s	4.245023s	Success
fork_simple.c	Success	None	0.053677s	4.294763s	Success
fork_syscall.c	Success	None	0.059697s	4.313260s	Success
forkandopen.c	Success	None	0.056701s	4.276169s	Success
forkdup.c	Success	None	0.056429s	3.853653s	Success
forkexecuid.c	Success	None	0.052518s	5.838632s	Success
forkexecv-arg.c	Success	None	0.053847s	5.630603s	Success
forkexecv.c	Success	None	0.052728s	5.718756s	Success
forkfiles.c	Success	None	0.056325s	4.239097s	Success
forkmalloc.c	Success	None	0.068750s	4.305446s	Success
forknodup.c	Success	None	0.056609s	4.225991s	Success
function-ptr.c	Success	None	0.052394s	4.271128s	Success
getegid_syscall.c	Success	None	0.055875s	4.262774s	Success
getgid_syscall.c	Success	None	0.055967s	4.263881s	Success
getpid.c	Success	None	0.047526s	4.196568s	Success
getpid_syscall.c	Success	None	0.056787s	4.277085s	Success
getppid.c	Success	None	0.056470s	4.305372s	Success
getppid_syscall.c	Success	None	0.058453s	4.238013s	Success
getuid.c	Success	None	0.056858s	4.242620s	Success
getuid_syscall.c	Success	None	0.053807s	4.247841s	Success
hello-arg.c	Success	None	0.044731s	3.825070s	Success
hello.c	Success	None	0.045324s	3.815173s	Success
longjmp.c	Success	None	0.046093s	3.832554s	Success
mutex.c	Success	None	2.061641s	6.539640s	Success
sem_forks.c	Success	None	0.059021s	4.248331s	Success
setsid.c	Success	None	0.047374s	3.816643s	Success
template.c	Success	None	0.054702s	4.249344s	Success
test_exec_nofork.c	Success	None	0.053282s	5.799000s	Success
test_unlink_open_file.c	Success	None	0.049047s	3.799556s	Success
thread.c	Success	None	0.050014s	4.346827s	Success
uname.c	Success	None	0.049219s	4.273065s	Success
wait.c	Success	None	2.052683s	5.847322s	Success
waitpid_anychild.c	Success	None	0.056248s	4.240694s	Success
waitpid_syscall.c	Success	None	1.055963s	5.226780s	Success
waitpid_wnohang.c	Success	None	0.055579s	3.833202s	Success
Signal Tests
alarm.c	Success	None	7.055599s	10.867727s	Success
setitimer.c	Success	None	7.054715s	10.841527s	Success
sigalrm.c	Success	None	2.054946s	5.836210s	Success
sigchld.c	Success	None	1.056396s	4.873618s	Success
signal-fork.c	Success	None	4.057463s	7.883913s	Success
signal-simple.c	Success	None	0.054885s	3.827275s	Success
signal_fork.c	Success	None	0.052700s	4.244526s	Success
signal_int_ignored.c	Success	None	2.055328s	6.270663s	Success
sigprocmask.c	Success	None	1.053834s	4.841177s	Success

Fail Tests

Summary

Metric	Count
Total Test Cases	2
Number of Successes	2
Number of Failures	0
Number of Compilation Failure Native	0
Number of Runtime Failure Native	0
Number of Segmentation Fault Native	0
Number of Timeout During Native	0
Number of Lind Wasm Compile Failure	0
Number of Lind Wasm Runtime Failure	0
Number of Lind Wasm Segmentation Failure	0
Number of Timeout During Lind Wasm run	0
Number of Unknown Failure	0
Number of C Compiler and Wasm Output mismatch	0
Number of Fail Test: Native Succeeded (Should Fail)	0
Number of Fail Test: Wasm Succeeded (Should Fail)	0
Number of Fail Test: Both Native and Wasm Succeeded (Should Fail)	0
Number of Fail Test: Native Compilation Failure (Should Succeed)	0
Number of Fail Test: Wasm Compilation Failure (Should Succeed)	0

Test Results by Category

Test Case	Status	Error Type	Native Time	Wasm Time	Output
Memory Tests
mmap-negative1.c	Success	None	0.119847s	4.503752s	Success
mmap-negative2.c	Success	None	0.117563s	4.060055s	Success