** Description changed:
I'm doing backup of a running mongodb using LVM snapshot. Sometimes I
run into a deadlock situation and kernel reports blocked tasks for jbd2,
mongod, dmeventd and my tar doing backup.
This happens very rarely (one in a thousand) but the effect is rather
severe as mongodb stops working. I also can't remove and unmount the
I have Ubuntu 16.04.1 (lvm2 2.02.133-1ubuntu10) with mongod 3.2.9 on a
- According to the link below its a kernel race fixed in latest lvm2
+ According to the link below its a kernel race with considerably
+ decreased chance in latest lvm2 package.
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deadlock during lvm snapshot
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