[Bug 536994] Re: kernel lockups unmounting ext4 lvm2 snapshots

[Kees Cook]

Sometimes I'll survive a lock up if I just wait long enough.  I see my
load hit 1 solid for a long time, and I see in ps output:

$ ps auwwx | grep " D "
root      7143  0.0  0.0      0     0 ?        D    15:51   0:00 [kdmflush]
root      7146  0.1  0.0      0     0 ?        D    15:51   0:00 [kcopyd]
root      7239  0.0  0.0      0     0 ?        D    15:51   0:00 [jbd2/dm-33-8]
root      7518  0.0  0.0      0     0 ?        D    15:52   0:00 [flush-252:33]

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kernel lockups unmounting ext4 lvm2 snapshots
https://bugs.launchpad.net/bugs/536994
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