[Bug 992480] Re: fsck.btrfs of a 1TB volume triggers OOM kill on a 1GB RAM machine. (32-bit)

[Arie Skliarouk]

I added 2 GB to the machine, so it now has 6GB and the script finished
by itself after using 3457MB of memory:

Incorrect local backref count on 307295731712 root 260 owner 4526738 offset 0 found 0 wanted 1 back 0xc5909180
backpointer mismatch on [307295731712 57344]
owner ref check failed [307295731712 57344]
ref mismatch on [307295789056 53248] extent item 1, found 0
repair deleting extent record: key 307295789056 168 53248
failed to repair damaged filesystem, aborting

It failed to repair the filesystem, but this is topic for a different
bug.

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Title:
  fsck.btrfs of a 1TB volume triggers OOM kill on a 1GB RAM machine.
  (32-bit)

Status in “btrfs-tools” package in Ubuntu:
  Confirmed

Bug description:
  fsck.btrfs of a 1TB volume triggers OOM kill on a 1GB RAM machine.
  (32-bit)

  Thats about all there is to say:

  sudo fsck -v /dev/sdd1
  fsck from util-linux 2.20.1
  fsck: Warning... fsck.btrfs for device /dev/sdd1 exited with signal 9.

  May  1 17:49:10 lifelesswks kernel: [639863.533203] Out of memory: Kill process 32192 (fsck.btrfs) score 846 or sacrifice child
  May  1 17:49:10 lifelesswks kernel: [639863.533210] Killed process 32192 (fsck.btrfs) total-vm:2555884kB, anon-rss:772228kB, file-rss:0kB

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