https://bz.apache.org/bugzilla/show_bug.cgi?id=70267
Bug ID: 70267
Summary: SIGTERM delivered during startup may crash the child
Product: Apache httpd-2
Version: 2.5-HEAD
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: mpm_event
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Seen in our CI: https://github.com/DataDog/dd-trace-php/pull/4304
#24 exit(0)
#25 clean_child_exit event.c:782
#26 just_die event.c:787
#27 <signal handler called>
#28 _int_malloc
interrupted
#29 calloc
#30 apr_allocator_create
#31 ap_thread_current_create util.c:3230
#32 ap_thread_main_create util.c:3293
#33 child_main event.c:2644
#34 make_child event.c:2880
The interrupted allocation leaves the allocator in a bad state. Calls to exit()
will run the atexit handlers, which may in turn use the allocator too.
exit() is not async-signal-safe. just_die should use _Exit(), or the child
should be forked with the signal blocked and the pending signal processed only
when safe.
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