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Cause:
IPC client exits in very specific time-frame of connection handshake.
Consequence:
Corosync receives SIGPIPE and dies.
Fix:
Function which is responsible for SIGPIPE (sendto) is called with flag which makes SIGPIPE handled by sendto function.
Result:
Corosync doesn't receive SIGPIPE and doesn't die.
Created attachment 743139[details]
Proposed patch - Handle SIGPIPE in req_setup_send
Description of problem:
When IPC client exits exactly when req_setup_send function calls send,
SIGPIPE is generated and corosync (because SIGPIPE is not handled)
exits.
Version-Release number of selected component (if applicable):
Flatiron
How reproducible:
99.21%
Steps to Reproduce:
1. Execute corosync without RR scheduling (pass -p parameter)
2. Execute many confdb IPC clients where each of them is tracking some key(s) and makes changes to that key(s) (or use https://github.com/jfriesse/csts/blob/master/apps/confdb-track-and-change.c)
3. send SIGINT to IPC clients
4. *Corosync* receives SIGPIPE and dies
"Unit" test:
https://github.com/jfriesse/csts/blob/master/tests/sigpipe-on-confdb-exit.sh
Actual results:
$res != 0
Expected results:
$res == 0
Additional info:
Problem is NOT specific to confdb, but it's a way how to reproduce problem reliably.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
http://rhn.redhat.com/errata/RHBA-2013-1531.html