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[Bug 568319] DM lockup causes filesystem failure
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Wed, 3 Feb 2010 09:30:41 +0000
  • Message-id: <20100203093041.18EC024551B@xxxxxxxxxxxxxxxxxxxxxx>

--- Comment #8 from Nikanth K <knikanth@xxxxxxxxxx> 2010-02-03 09:30:40 UTC ---
I guess this is mostly an xfs over loop on xfs bug. Just that when the loop
device supports barrier(issues fsync), xfs deadlocks.

pdflush: writing dirty pages of the encrypted loop files. It holds an exclusive
lock of the sb inodes of this encrypted disk.

loop0,loop1,loop2,loop3: all are flushing the encrypted disk. Have issued an
fsync on the underlying fs and waiting for them to finish. But it never

kdmflush: all are waiting for loop threads to complete I/O.

xfsdata/3 is waiting for excl lock of some inode.

mld_hash holds shared/read lock of some inode.

par2 holds exclusive/write locks on some inodes.

There seems to be a deadlock for the inode lock.

If you can upload a dump, it would be easy to find out exact cause. It is quiet
difficult to deduce which xfs call we are seeing, whether the xfs calls over
the encrypted disk or the underlying disk.

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