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Message #00335
[Bug 333750] Re: rw_lock still has possibility to hangup
I don't understand the another possibilities yet.
Hmm...
~percona-dev/percona-xtradb/trial-fix-wait-ex
may be effective, if you still meet the hang.
If this patch is effective, I don't trust behavior of the CPU....
--
rw_lock still has possibility to hangup
https://bugs.launchpad.net/bugs/333750
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developers, which is the registrant for Percona patches.
Status in Patches for MySQL by Percona: Confirmed
Status in Percona XtraDB Storage Engine for MySQL: In Progress
Bug description:
rw_lock implementation may still have possibility to hangup
--Thread 1409067328 has waited at ../../storage/innobase/include/btr0btr.ic line 31 for 7.00 seconds the semaphore:
X-lock on RW-latch at 0x7f1b0bf3cab8 created in file buf/buf0buf.c line 810
a writer (thread id 1409067328) has reserved it in mode wait exclusive
number of readers 0, s_waiters flag 1, x_waiters flag 1
Last time read locked in file not yet reserved line 0
Last time write locked in file btr/btr0cur.c line 467
or
--Thread 1397074240 has waited at btr/btr0cur.c line 418 for 0.00 seconds the semaphore:
S-lock on RW-latch at 0x7f8ef9292138 created in file dict/dict0dict.c line 1541
number of readers 0, s_waiters flag 0, x_waiters flag 0
Last time read locked in file btr/btr0cur.c line 418
Last time write locked in file btr/btr0cur.c line 411
References