[Bugs] [Bug 1637743] Glusterd seems to be attempting to start the same brick process twice

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1637743



--- Comment #4 from Shyamsundar <srangana at redhat.com> ---
### Other observations in the code ###

- Attempt flush if THIS is allocated, else skip, in gf_log_flush (else THIS
calls allocation routines which we want to avoid in signal handlers)

- _gf_msg_plain_internal should not invoke syslog as that allocates memory
(when in a signal handler)

- signal disposition should be changed to default when we are addressing the
signal in the handler, as soon as possible than at the end to avoid cascading
signals

- cleanup_and exit can change signal dispositions to default, and generate a
core in case of failures, than causing cascading cleanup SEGV signals when such
events occur

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