From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 16278] New: lvm snapshot causes deadlock in 2.6.35
Date: Wed, 23 Jun 2010 16:55:42 GMT
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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@kernel-bugs.osdl.org
ReportedBy: psusi@cfl.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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