[Bug 675185] Re: [Hardy SRU] dash bug causes mysqld_safe to spin at 100% CPU
Raghavendra D Prabhu
raghavendra.prabhu at percona.com
Thu Sep 20 01:21:15 UTC 2012
lp:1053183 is the issue for providing upstart scripts with percona-
server.
** Changed in: percona-server/5.5
Status: New => Invalid
** Changed in: percona-server/5.1
Status: New => Invalid
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https://bugs.launchpad.net/bugs/675185
Title:
[Hardy SRU] dash bug causes mysqld_safe to spin at 100% CPU
Status in Maria:
Fix Released
Status in Percona Server with XtraDB:
Invalid
Status in Percona Server 5.1 series:
Invalid
Status in Percona Server 5.5 series:
Invalid
Status in “dash” package in Ubuntu:
New
Status in “mysql-5.1” package in Ubuntu:
Confirmed
Bug description:
Symptoms are: After mysql server upgrades + restarts the old mysqld_safe keeps running and consumes 100% cpu, strace shows:
wait4(4294967295, 0x7fffb3b3d59c, 0, NULL) = -1 ECHILD (No child ...
wait4(4294967295, 0x7fffb3b3d59c, 0, NULL) = -1 ECHILD (No child ...
wait4(4294967295, 0x7fffb3b3d59c, 0, NULL) = -1 ECHILD (No child ...
For more info see the dupes, particularily bug 105457. Does not happen always, for reliable test case see below.
This is a bug (race condition) in dash, partly fixed by
http://git.kernel.org/?p=utils/dash/dash.git;a=commit;h=3800d4934391b144fd261a7957aea72ced7d47ea
. This fixes the test case and mysqld_safe, but introduces another
regression: http://eeek.borgchat.net/lists/dash/msg00268.html (patch
for that in the thread)
TEST CASE: Script in the commit message (link above). Allows to
reproduce this always, even on Karmic still.
SRU JUSTIFICATION: Obviously safe patch.
PATCH: Attached, run mysqld_safe in bash instead of dash.
REGRESSION POTENTIAL: Minimal. 1) Bash is a superset of dash. 2)
Before dash became the default sh, bash was used, we just revert that
change.
NOTES: mysqld_safe was replaced by an upstart job in Lucid. But Hardy
has support for 3 more years, justifiying a fix.
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