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Cause
Extremely overloaded corosync (pload).
Consequence
IPC messages can be lost without giving information to application nor user.
Fix
Internal calls to mcast is properly checked and error code is returned.
Result
Application using IPC can now properly handle inability to send IPC message in given moment and can try send message later.
Created attachment 526637[details]
Proposed patch for cpg
Description of problem:
totem_mcast function can return -1 if corosync is overloaded. Sadly in
many calls of this functions was error code ether not handled at all, or
handled by assert.
Commit changes behaviour to ether return CS_ERR_TRY_AGAIN or put error
code to later layers to handle it.
Version-Release number of selected component (if applicable):
1.4.1
How reproducible:
https://bugzilla.redhat.com/show_bug.cgi?id=664969
Unit test:
https://bugzilla.redhat.com/show_bug.cgi?id=664969
Technical note added. If any revisions are required, please edit the "Technical Notes" field
accordingly. All revisions will be proofread by the Engineering Content Services team.
New Contents:
Cause
Extremely overloaded corosync (pload).
Consequence
IPC messages can be lost without giving information to application nor user.
Fix
Internal calls to mcast is properly checked and error code is returned.
Result
Application using IPC can now properly handle inability to send IPC message in given moment and can try send message later.
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-2012-0777.html