software hang at printk with "CONFIG_STACK_CANARIES=y" #1603
Description
Reported by Javier B Perez:
Configuration
x86
arduino_101
micro
Bug detailed description
Run sample test code "zephyr/tests/kernel/test_stackprot/microkernel" @Arduino_101 board, software hang at printk.
NOTE1: If disable "CONFIG_STACK_CANARIES=y", issue is not observed.
NOTE2: The issue is not observed with qemu_x86, even with "CONFIG_STACK_CANARIES=y"
Testcase to Reproduce
sample test code "zephyr/tests/kernel/test_stackprot/microkernel"
Steps to Reproduce
- cd zephyr
- source zephyr-env.sh
- cd tests/kernel/test_stackprot/microkernel
- make pristine;make BOARD=arduino_101 flash
- verify from UART output nothing.
(gdb) b RegressionTask
Breakpoint 1 at 0x400332af: file /home/sharron/workspace/views/iot/forto-collab/samples/microkernel/test/test_stackprot/src/stackprot.c, line 145.
(gdb) c
Continuing.
target running
target is still running!
hit hardware breakpoint (hwreg=0) at 0x400332af
Breakpoint 1, RegressionTask ()
at /home/sharron/workspace/views/iot/forto-collab/samples/microkernel/test/test_stackprot/src/stackprot.c:145
145 {
(gdb) c
software hang here. Press ctrl+c to stop, and check from gdb:
^C
Program received signal SIGINT, Interrupt.
_vprintk (ap=0xa800a000 <__REGRESSIONTASK_stack+2024> "\353\067\003@\020\240",
fmt=0x40033816 "%s\n")
at /home/sharron/workspace/views/iot/forto-collab/misc/printk.c:79
79 while (*fmt) {
(gdb) l
74 {
75 int might_format = 0; /* 1 if encountered a '%' */
76
77 /* fmt has already been adjusted if needed */
78
79 while (*fmt) {
80 if (!might_format) {
81 if (*fmt != '%') {
82 _char_out((int)*fmt);
83 } else {
(gdb) p *fmt
$1 = 37 '%'
(gdb) bt
Python Exception <type 'exceptions.ImportError'> No module named gdb.frames:
<span>#</span>0 _vprintk (
ap=0xa800a000 <__REGRESSIONTASK_stack+2024> "\353\067\003@\020\240",
fmt=0x40033816 "%s\n")
at /home/sharron/workspace/views/iot/forto-collab/misc/printk.c:79
<span>#</span>1 printk (fmt=0x0)
at /home/sharron/workspace/views/iot/forto-collab/misc/printk.c:165
<span>#</span>2 0x400332af in AlternateTask ()
at /home/sharron/workspace/views/iot/forto-collab/samples/microkernel/test/test_stackprot/src/stackprot.c:126
<span>#</span>3 0xa800a004 in __REGRESSIONTASK_stack ()
<span>#</span>4 0x400332c1 in RegressionTask ()
at /home/sharron/workspace/views/iot/forto-collab/samples/microkernel/test/test_stackprot/src/stackprot.c:146
<span>#</span>5 0x400337eb in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb)
Expected Result
UART output:
PROJECT EXECUTION SUCCESSFUL
Actual Result
UART output nothing, software hang at printk.
User Impact
When app call printk with stack protection enabled, software hang.
(Imported from Jira ZEP-3)