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Prevent printing crash report in a loop

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In the event that we are crashing due to a corrupt Ruby stack, we might
re-enter rb_vm_bugreport() due to failed assertions in
rb_backtrace_print_as_bugreport() or SDR(). In these cases we were
printing the bug report ad infinitum with unbounded recusion.

I seem to run into this every once in a while and the amount of log it
prints out is pretty distracting. On CI environments it makes the log
output unnecessarily big. Let's fix this.
This commit is contained in:
Alan Wu 2022-03-29 13:38:55 -04:00
parent 9125374726
commit e4fe347302
Notes: git 2022-06-04 02:51:00 +09:00 
Merged: https://github.com/ruby/ruby/pull/5731
1 changed files with 11 additions and 0 deletions
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vm_dump.c
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@ -1021,6 +1021,17 @@ rb_vm_bugreport(const void *ctx)
} }
} }
// Thread unsafe best effort attempt to stop printing the bug report in an
// infinite loop. Can happen with corrupt Ruby stack.
{
static bool crashing = false;
if (crashing) {
fprintf(stderr, "Crashed while printing bug report\n");
return;
}
crashing = true;
}
#ifdef __linux__ #ifdef __linux__
# define PROC_MAPS_NAME "/proc/self/maps" # define PROC_MAPS_NAME "/proc/self/maps"
#endif #endif