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lib: don't print 2 backtraces for crashes

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abort() raises SIGABRT, which would confusingly cause a 2nd backtrace to
be printed after the first one...

Signed-off-by: David Lamparter <equinox@diac24.net>
This commit is contained in:
David Lamparter 2021-04-16 04:38:25 +02:00
parent 79ec61be27
commit 5be4799dc5
1 changed files with 13 additions and 1 deletions
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14
lib/sigevent.c
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@ -237,9 +237,12 @@ core_handler(int signo, siginfo_t *siginfo, void *context)
/* make sure we don't hang in here. default for SIGALRM is terminate.
* - if we're in backtrace for more than a second, abort. */
struct sigaction sa_default = {.sa_handler = SIG_DFL};
sigaction(SIGALRM, &sa_default, NULL);
sigaction(signo, &sa_default, NULL);
sigset_t sigset;
sigemptyset(&sigset);
sigaddset(&sigset, SIGALRM);
sigprocmask(SIG_UNBLOCK, &sigset, NULL);
@ -252,7 +255,16 @@ core_handler(int signo, siginfo_t *siginfo, void *context)
log_memstats(stderr, "core_handler");
zlog_tls_buffer_fini();
abort();
/* give the kernel a chance to generate a coredump */
sigaddset(&sigset, signo);
sigprocmask(SIG_UNBLOCK, &sigset, NULL);
raise(signo);
/* only chance to end up here is if the default action for signo is
* something other than kill or coredump the process
*/
_exit(128 + signo);
}
static void trap_default_signals(void)