From: Joseph Qi <joseph.qi@huawei.com>
To: ocfs2-devel@oss.oracle.com
Subject: [Ocfs2-devel] ocfs2: a dead lock case when running dirop_fileop_racer
Date: Thu, 7 Nov 2013 20:12:02 +0800 [thread overview]
Message-ID: <527B8392.8010807@huawei.com> (raw)
We ran ocfs2 test program dirop_fileop_racer and found a dead lock case.
The case is described below.
2 nodes, say Node A and Node B, mount the same ocfs2 volume. Create
/race/16/1 in the filesystem, and let the inode number of dir 16 is less
than the inode number of dir race.
Node A Node B
mv /race/16/1 /race/
right after Node A has got the
EX mode of /race/16/, and tries to
get EX mode of /race
ls /race/16/
In this case, Node A has got the EX mode of /race/16/, and wants to get
EX mode of /race/. Node B has got the PR mode of /race/, and wants to
get the PR mode of /race/16/. Since EX and PR are mutually exclusive,
dead lock happens.
next reply other threads:[~2013-11-07 12:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-07 12:12 Joseph Qi [this message]
2013-11-07 13:19 ` [Ocfs2-devel] ocfs2: a dead lock case when running dirop_fileop_racer Joel Becker
2013-11-08 2:19 ` Joseph Qi
2013-11-28 1:40 ` Joseph Qi
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