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backtrace: avoid undefined behaviour on re-initialisation

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cb_buf_mutex is statically initialised, so we can not destroy it when
we are shutting down the err subsystem. If we destroy it, and then
re-initialise tor, all our backtraces will fail.

Part of 31736, but committed in this branch to avoid merge conflicts.
This commit is contained in:
teor 2019-09-20 11:40:05 +10:00
parent ab7bfdf404
commit 315f14c709
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1 changed files with 4 additions and 0 deletions
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src/lib/err/backtrace.c
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@ -251,6 +251,10 @@ remove_bt_handler(void)
* It's not a fatal error, so we just ignore it. */ * It's not a fatal error, so we just ignore it. */
(void)sigaction(trap_signals[i], &sa, NULL); (void)sigaction(trap_signals[i], &sa, NULL);
} }
/* cb_buf_mutex is statically initialised, so we can not destroy it.
* If we destroy it, and then re-initialise tor, all our backtraces will
* fail. */
} }
#endif /* defined(USE_BACKTRACE) */ #endif /* defined(USE_BACKTRACE) */