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gh-137185: Fix _Py_DumpStack() async signal safety (gh-137187)

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Call backtrace() once when installing the signal handler to ensure that
libgcc is dynamically loaded outside the signal handler.

This fixes a "signal-unsafe call inside of a signal" TSan error from
test_faulthandler.test_enable_fd.
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Sam Gross 2025-07-29 10:25:32 -04:00 • committed by GitHub
parent d7e12a362a
commit 11a8652e25
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10
Python/traceback.c
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@ -1326,3 +1326,13 @@ _Py_DumpStack(int fd)
PUTS(fd, " <cannot get C stack on this system>\n");
}
#endif
void
_Py_InitDumpStack(void)
{
#ifdef CAN_C_BACKTRACE
// gh-137185: Call backtrace() once to force libgcc to be loaded early.
void *callstack[1];
(void)backtrace(callstack, 1);
#endif
}