Hi list -
Getting sporadic page allocation failures in btrfs send. This happened
once several weeks ago but was fine after a reboot; yesterday I did not
reboot, but had the failure back-to-back trying to send two different
snapshots. These are full sends, not incremental, of a bit over 600G of
data. Test machine has 32G of RAM, with 21G of it free (not including
cache):
root@gwa-virt1:/data/images/.snapshots# free -m
total used free shared buffers cached
Mem: 32159 31789 369 0 0 21276
-/+ buffers/cache: 10513 21646
Swap: 0 0 0
In both cases (all three, really) the btrfs send failed a bit more than
half of the way through the send (somewhere around the 380GB mark).
Kern log snippets follow:
Jan 12 14:05:36 gwa-virt1 kernel: [535523.627611] btrfs: page allocation
failure: order:6, mode:0x104050
Jan 12 14:05:36 gwa-virt1 kernel: [535523.627622] CPU: 6 PID: 9642 Comm:
btrfs Not tainted 3.13.0-031300rc7-generic #201401041835
Jan 12 14:05:36 gwa-virt1 kernel: [535523.627773] [<ffffffffa0142214>] ?
btrfs_get_token_64+0x64/0xf0 [btrfs]
Jan 12 14:05:36 gwa-virt1 kernel: [535523.627818] [<ffffffffa01876dd>] ?
ulist_add_merge+0xcd/0x270 [btrfs]
Jan 12 14:05:36 gwa-virt1 kernel: [535523.627860] [<ffffffffa01876dd>]
ulist_add_merge+0xcd/0x270 [btrfs]
Jan 12 14:05:36 gwa-virt1 kernel: [535523.627894] [<ffffffffa018615c>]
find_parent_nodes+0x50c/0x6f0 [btrf ]
Jan 12 14:05:36 gwa-virt1 kernel: [535523.627930] [<ffffffffa018e550>] ?
compare_refs.isra.23+0x130/0x130 btrfs]
Jan 12 14:05:36 gwa-virt1 kernel: [535523.627965] [<ffffffffa0187019>]
iterate_extent_inodes+0xf9/0x270 [btrfs]
Jan 12 14:05:36 gwa-virt1 kernel: [535523.628003] [<ffffffffa014b7a5>] ?
free_extent_buffer+0x35/0x40 [btrfs]
Jan 12 14:05:36 gwa-virt1 kernel: [535523.628037] [<ffffffffa018dc9d>]
find_extent_clone.isra.26+0x26d/0x340 [btrfs]
Jan 12 14:05:36 gwa-virt1 kernel: [535523.628072] [<ffffffffa0191207>]
process_extent+0xd7/0x180 [btrfs]
Jan 12 14:05:36 gwa-virt1 kernel: [535523.628107] [<ffffffffa01918ff>]
changed_cb+0xdf/0x170 [btrfs]
Jan 12 14:05:36 gwa-virt1 kernel: [535523.628141] [<ffffffffa0191ad2>]
full_send_tree+0x142/0x280 [btrfs]
Jan 12 14:05:36 gwa-virt1 kernel: [535523.628174] [<ffffffffa0191ccc>] ?
send_subvol_begin+0xbc/0x2b0 [btrfs]
Jan 12 14:05:36 gwa-virt1 kernel: [535523.628209] [<ffffffffa0191fa0>]
send_subvol+0xe0/0xf0 [btrfs]
Jan 12 14:05:36 gwa-virt1 kernel: [535523.628244] [<ffffffffa01922f1>]
btrfs_ioctl_send+0x341/0x520 [btrfs]
Jan 12 14:05:36 gwa-virt1 kernel: [535523.628279] [<ffffffffa01606d3>]
btrfs_ioctl+0x953/0xac0 [btrfs]
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016512] btrfs: page allocation
failure: order:5, mode:0x104050
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016518] CPU: 4 PID: 18689
Comm: btrfs Not tainted 3.13.0-031300rc7-generic #201401041835
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016597] [<ffffffffa0142214>] ?
btrfs_get_token_64+0x64/0xf0 [btrfs]
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016617] [<ffffffffa01876dd>] ?
ulist_add_merge+0xcd/0x270 [btrfs]
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016637] [<ffffffffa01876dd>]
ulist_add_merge+0xcd/0x270 [btrfs]
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016653] [<ffffffffa018615c>]
find_parent_nodes+0x50c/0x6f0 [btrf ]
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016669] [<ffffffffa018e550>] ?
compare_refs.isra.23+0x130/0x130 btrfs]
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016684] [<ffffffffa0187019>]
iterate_extent_inodes+0xf9/0x270 [btrfs]
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016700] [<ffffffffa014b7a5>] ?
free_extent_buffer+0x35/0x40 [btrfs]
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016716] [<ffffffffa018dc9d>]
find_extent_clone.isra.26+0x26d/0x340 [btrfs]
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016732] [<ffffffffa0191207>]
process_extent+0xd7/0x180 [btrfs]
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016747] [<ffffffffa01918ff>]
changed_cb+0xdf/0x170 [btrfs]
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016763] [<ffffffffa0191ad2>]
full_send_tree+0x142/0x280 [btrfs]
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016778] [<ffffffffa0191ccc>] ?
send_subvol_begin+0xbc/0x2b0 [btrfs]
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016794] [<ffffffffa0191fa0>]
send_subvol+0xe0/0xf0 [btrfs]
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016810] [<ffffffffa01922f1>]
btrfs_ioctl_send+0x341/0x520 [btrfs]
Jan 12 21:34:00 gwa-virt1 kernel: [562448.016826] [<ffffffffa01606d3>]
btrfs_ioctl+0x953/0xac0 [btrfs]
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