linux-ext4 - [Bug 16278] New: lvm snapshot causes deadlock in 2.6.35

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Date:	Wed, 23 Jun 2010 16:55:42 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 16278] New: lvm snapshot causes deadlock in 2.6.35

https://bugzilla.kernel.org/show_bug.cgi?id=16278

           Summary: lvm snapshot causes deadlock in 2.6.35
           Product: File System
           Version: 2.5
    Kernel Version: 2.6.35-rc[123]
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@...nel-bugs.osdl.org
        ReportedBy: psusi@....rr.com
        Regression: Yes


Copying from: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/595489

Attempting to snapshot the root lv causes a deadlock in 2.6.35 when it suspends
the root lv device to replace the table. The lvcreate -n snap -s -L 1g lv/root
command hangs, can not be killed, and no further IO is possible, and the system
must be hard booted with magic-sysrq.

Narrowed down cause to commit 6b0310fbf087ad6: "ext4: don't return to userspace
after freezing the fs with a mutex held".  After reversing this change, the
problem goes away.

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