Bug #2572
closedkrbd: writeback errors?
0%
Description
While trying to reproduce a null pointer messenger problem,
I kept hitting messages like this after some (fairly random)
number of iterations:
[ 885.866666] =====================================
[ 885.866667] [ BUG: bad unlock balance detected! ]
[ 885.866669] 3.5.0-rc1-ceph-00037-g07accf4 #1 Not tainted
[ 885.866670] -------------------------------------
[ 885.866673] flush-250:0/9378 is trying to release lock (&(&wb->list_lock)->r:
[ 885.866679] [<ffffffff811ac309>] wb_writeback+0x199/0x2d0
[ 885.866679] but there are no more locks to release!
(full dump below)
This appears to be a writeback-related problem, but I think we
need to investigate to see whether the problem has something to
do with RBD.
I have been running xfstests over RBD, and test 049 is the one
that has been reliable in reproducing problems. This may
complicate understanding this issue a bit, because this test
runs some tests on various combinations of one file system
mounted on a loop device backed by a file on another file
system, which is then backed by an RBD device. And the
loop-mounted and underlying file systems are ext2 or xfs.
Updated by Sage Weil almost 12 years ago
- Project changed from Linux kernel client to rbd
Updated by Josh Durgin almost 12 years ago
- Subject changed from rbd client: writeback errors? to krbd: writeback errors?
Updated by Alex Elder about 11 years ago
- Status changed from New to Resolved
I've run xfstests 49 a bunch of times consecutively
and I am no longer seeing this issue.
I'm about to run it 100 times, and if I don't see it I'm
going to update the nightly test file so it adds test
49 back into the test. I couldn't find any issue that
recorded removing that test from the nightly runs so
I created http://tracker.ceph.com/issues/4244.