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[Bug 568319] DM lockup causes filesystem failure
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Tue, 16 Feb 2010 12:02:25 +0000
  • Message-id: <20100216120225.3040E24551B@xxxxxxxxxxxxxxxxxxxxxx>

--- Comment #16 from Nikanth K <knikanth@xxxxxxxxxx> 2010-02-16 12:02:24 UTC ---
This more and more looks like an xfs issue.

The problem could be that, when xfsdatad is waiting for lock on the loop
mounted(nested inside another xfs) xfs file-system and pdflush holds an
xfs_ilock in the nested xfs and waits for the log to be flushed.
But pdflush's wait will not complete as xfsdatad is per-cpu and not per-mounted
file-system. For pdflush to recover, xfsdatad has to work on the items queued
for the underlying xfs filesystem, instead of working/waiting on the lock for
the nested file-system. This creates a deadlock.

If this is the case, this could be resolved, either by creating xfsdatad per
mounted file-system, or by imposing some kind of ordering/priority such that
the underlying filesystem's work is given higher priority

I would also comment on the as
well to get some feedback

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