[Bug 595489] [NEW] lvm snapshot of root lv causes deadlock in 2.6.35

[Phillip Susi]

Public bug reported:

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.

Started with Ubuntu 2.6.35-rc3-3 kernel, then tested mainline kernels
2.6.35 rc1, rc2, and rc3 all have the issue.  Mainline 2.6.34 does not
have the problem.  Hopefully I'll be able to do some git bisecting
tonight.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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lvm snapshot of root lv causes deadlock in 2.6.35
https://bugs.launchpad.net/bugs/595489
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