kernel-packages team mailing list archive

Thread
Date
[Bug 1576297] Re: BTRFS Page allocation failure with Bacula.

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Thomas Mayer <1576297@xxxxxxxxxxxxxxxxxx>
Date: Thu, 23 Jun 2016 15:26:25 -0000
Reply-to: Bug 1576297 <1576297@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
As MikeB pointed out, the issue still exists with latest mainline
kernel. Therefore, I added Tag "kernel-bug-exists-upstream" and changed
status to "confirmed".

I know of another user with the same problem. He was also testing
against latest mainline kernel with no success.

** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1576297

Title:
  BTRFS Page allocation failure with Bacula.

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  As soon as bacula starts running I see the below errors in the kernel
  log, and the server eventually hangs at some point. I'm backing up our
  servers to a local BTRFS volume on a local drive, nothing fancy and it
  used to work really well in Ubuntu 14.04.

  Apr 27 21:05:18 backup kernel: [343463.805173] kworker/u4:5: page allocation failure: order:0, mode:0x2204020
  Apr 27 21:05:18 backup kernel: [343463.805178] CPU: 1 PID: 19811 Comm: kworker/u4:5 Not tainted 4.4.0-21-generic #37-Ubuntu
  Apr 27 21:05:18 backup kernel: [343463.805179] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
  Apr 27 21:05:18 backup kernel: [343463.805199] Workqueue: btrfs-submit btrfs_submit_helper [btrfs]
  Apr 27 21:05:18 backup kernel: [343463.805201]  0000000000000086 000000005236f502 ffff880019f2b548 ffffffff813e93c3
  Apr 27 21:05:18 backup kernel: [343463.805203]  0000000002204020 0000000000000000 ffff880019f2b5d8 ffffffff81192fba
  Apr 27 21:05:18 backup kernel: [343463.805205]  ffff88007fff9d40 ffff88007fffb6e0 0000000000000000 ffffffff00000060
  Apr 27 21:05:18 backup kernel: [343463.805206] Call Trace:
  Apr 27 21:05:18 backup kernel: [343463.805211]  [<ffffffff813e93c3>] dump_stack+0x63/0x90
  Apr 27 21:05:18 backup kernel: [343463.805214]  [<ffffffff81192fba>] warn_alloc_failed+0xfa/0x150
  Apr 27 21:05:18 backup kernel: [343463.805217]  [<ffffffff81196b01>] __alloc_pages_nodemask+0x341/0xb60
  Apr 27 21:05:18 backup kernel: [343463.805220]  [<ffffffff811e084c>] alloc_pages_current+0x8c/0x110
  Apr 27 21:05:18 backup kernel: [343463.805222]  [<ffffffff811e992f>] new_slab+0x28f/0x490
  Apr 27 21:05:18 backup kernel: [343463.805224]  [<ffffffff811ea97b>] ___slab_alloc+0x22b/0x460
  Apr 27 21:05:18 backup kernel: [343463.805227]  [<ffffffff814bf3cd>] ? alloc_indirect.isra.4+0x1d/0x50
  Apr 27 21:05:18 backup kernel: [343463.805228]  [<ffffffff814bf3cd>] ? alloc_indirect.isra.4+0x1d/0x50
  Apr 27 21:05:18 backup kernel: [343463.805230]  [<ffffffff811eabd0>] __slab_alloc+0x20/0x40
  Apr 27 21:05:18 backup kernel: [343463.805231]  [<ffffffff811ec555>] __kmalloc+0x1d5/0x250
  Apr 27 21:05:18 backup kernel: [343463.805233]  [<ffffffff814bf3cd>] alloc_indirect.isra.4+0x1d/0x50
  Apr 27 21:05:18 backup kernel: [343463.805234]  [<ffffffff814bfaaa>] virtqueue_add_sgs+0x2ca/0x3a0
  Apr 27 21:05:18 backup kernel: [343463.805237]  [<ffffffff81571b9d>] __virtblk_add_req+0xbd/0x220
  Apr 27 21:05:18 backup kernel: [343463.805239]  [<ffffffff8118fe05>] ? mempool_alloc_slab+0x15/0x20
  Apr 27 21:05:18 backup kernel: [343463.805242]  [<ffffffff813c0113>] ? blk_rq_map_sg+0x223/0x570
  Apr 27 21:05:18 backup kernel: [343463.805243]  [<ffffffff81571e82>] virtio_queue_rq+0x112/0x280
  Apr 27 21:05:18 backup kernel: [343463.805245]  [<ffffffff813c48c6>] __blk_mq_run_hw_queue+0x1d6/0x380
  Apr 27 21:05:18 backup kernel: [343463.805247]  [<ffffffff813c46ce>] blk_mq_run_hw_queue+0x8e/0xb0
  Apr 27 21:05:18 backup kernel: [343463.805248]  [<ffffffff813c5c46>] blk_mq_insert_requests+0xf6/0x1c0
  Apr 27 21:05:18 backup kernel: [343463.805250]  [<ffffffff813c6958>] blk_mq_flush_plug_list+0x128/0x150
  Apr 27 21:05:18 backup kernel: [343463.805251]  [<ffffffff813bb606>] blk_flush_plug_list+0xd6/0x240
  Apr 27 21:05:18 backup kernel: [343463.805253]  [<ffffffff813bbb7c>] blk_finish_plug+0x2c/0x40
  Apr 27 21:05:18 backup kernel: [343463.805264]  [<ffffffffc01a7b13>] run_scheduled_bios+0x363/0x530 [btrfs]
  Apr 27 21:05:18 backup kernel: [343463.805275]  [<ffffffffc01a7cf5>] pending_bios_fn+0x15/0x20 [btrfs]
  Apr 27 21:05:18 backup kernel: [343463.805285]  [<ffffffffc01b2e8a>] btrfs_scrubparity_helper+0xca/0x2f0 [btrfs]
  Apr 27 21:05:18 backup kernel: [343463.805294]  [<ffffffffc01b31be>] btrfs_submit_helper+0xe/0x10 [btrfs]
  Apr 27 21:05:18 backup kernel: [343463.805297]  [<ffffffff81099ff2>] process_one_work+0x162/0x480
  Apr 27 21:05:18 backup kernel: [343463.805298]  [<ffffffff8109a35b>] worker_thread+0x4b/0x4c0
  Apr 27 21:05:18 backup kernel: [343463.805300]  [<ffffffff8109a310>] ? process_one_work+0x480/0x480
  Apr 27 21:05:18 backup kernel: [343463.805301]  [<ffffffff8109a310>] ? process_one_work+0x480/0x480
  Apr 27 21:05:18 backup kernel: [343463.805303]  [<ffffffff810a0528>] kthread+0xd8/0xf0
  Apr 27 21:05:18 backup kernel: [343463.805305]  [<ffffffff810a0450>] ? kthread_create_on_node+0x1e0/0x1e0
  Apr 27 21:05:18 backup kernel: [343463.805308]  [<ffffffff8182488f>] ret_from_fork+0x3f/0x70
  Apr 27 21:05:18 backup kernel: [343463.805309]  [<ffffffff810a0450>] ? kthread_create_on_node+0x1e0/0x1e0
  Apr 27 21:05:18 backup kernel: [343463.805310] Mem-Info:
  Apr 27 21:05:18 backup kernel: [343463.805313] active_anon:43184 inactive_anon:51940 isolated_anon:0
  Apr 27 21:05:18 backup kernel: [343463.805313]  active_file:123451 inactive_file:249283 isolated_file:0
  Apr 27 21:05:18 backup kernel: [343463.805313]  unevictable:1752 dirty:32219 writeback:6149 unstable:0
  Apr 27 21:05:18 backup kernel: [343463.805313]  slab_reclaimable:18341 slab_unreclaimable:4095
  Apr 27 21:05:18 backup kernel: [343463.805313]  mapped:58659 shmem:79658 pagetables:1755 bounce:0
  Apr 27 21:05:18 backup kernel: [343463.805313]  free:12908 free_pcp:138 free_cma:0
  Apr 27 21:05:18 backup kernel: [343463.805315] Node 0 DMA free:9992kB min:40kB low:48kB high:60kB active_anon:28kB inactive_anon:396kB active_file:256kB inactive_file:884kB unevictable:92kB isolated(anon):0kB isolated(file):0kB present:15992kB managed:15908kB mlocked:92kB dirty:936kB writeback:0kB mapped:60kB shmem:316kB slab_reclaimable:3424kB slab_unreclaimable:308kB kernel_stack:192kB pagetables:60kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:2580 all_unreclaimable? no
  Apr 27 21:05:18 backup kernel: [343463.805319] lowmem_reserve[]: 0 1981 1981 1981 1981
  Apr 27 21:05:18 backup kernel: [343463.805321] Node 0 DMA32 free:41640kB min:5580kB low:6972kB high:8368kB active_anon:172708kB inactive_anon:207364kB active_file:493548kB inactive_file:996248kB unevictable:6916kB isolated(anon):0kB isolated(file):0kB present:2080760kB managed:2032544kB mlocked:6916kB dirty:127940kB writeback:24596kB mapped:234576kB shmem:318316kB slab_reclaimable:69940kB slab_unreclaimable:16072kB kernel_stack:3184kB pagetables:6960kB unstable:0kB bounce:0kB free_pcp:552kB local_pcp:224kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
  Apr 27 21:05:18 backup kernel: [343463.805325] lowmem_reserve[]: 0 0 0 0 0
  Apr 27 21:05:18 backup kernel: [343463.805327] Node 0 DMA: 17*4kB (UEH) 65*8kB (UMEH) 8*16kB (UMH) 24*32kB (UMEH) 21*64kB (UMEH) 14*128kB (UMH) 7*256kB (UMH) 1*512kB (H) 1*1024kB (H) 1*2048kB (H) 0*4096kB = 9996kB
  Apr 27 21:05:18 backup kernel: [343463.805335] Node 0 DMA32: 60*4kB (H) 75*8kB (H) 64*16kB (H) 33*32kB (H) 44*64kB (H) 33*128kB (H) 20*256kB (H) 14*512kB (H) 7*1024kB (H) 6*2048kB (H) 0*4096kB = 41704kB
  Apr 27 21:05:18 backup kernel: [343463.805343] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
  Apr 27 21:05:18 backup kernel: [343463.805343] 453607 total pagecache pages
  Apr 27 21:05:18 backup kernel: [343463.805345] 317 pages in swap cache
  Apr 27 21:05:18 backup kernel: [343463.805346] Swap cache stats: add 4177, delete 3860, find 161061/161539
  Apr 27 21:05:18 backup kernel: [343463.805346] Free swap  = 1043312kB
  Apr 27 21:05:18 backup kernel: [343463.805347] Total swap = 1046524kB
  Apr 27 21:05:18 backup kernel: [343463.805348] 524188 pages RAM
  Apr 27 21:05:18 backup kernel: [343463.805349] 0 pages HighMem/MovableOnly
  Apr 27 21:05:18 backup kernel: [343463.805349] 12075 pages reserved
  Apr 27 21:05:18 backup kernel: [343463.805350] 0 pages cma reserved
  Apr 27 21:05:18 backup kernel: [343463.805350] 0 pages hwpoisoned
  Apr 27 21:05:18 backup kernel: [343463.805352] SLUB: Unable to allocate memory on node -1 (gfp=0x2080020)
  Apr 27 21:05:18 backup kernel: [343463.805353]   cache: kmalloc-2048, object size: 2048, buffer size: 2048, default order: 3, min order: 0
  Apr 27 21:05:18 backup kernel: [343463.805354]   node 0: slabs: 39, objs: 470, free: 0
  Apr 27 21:05:18 backup kernel: [343463.816748] kworker/1:1H: page allocation failure: order:0, mode:0x2204020
  Apr 27 21:05:18 backup kernel: [343463.816752] CPU: 1 PID: 154 Comm: kworker/1:1H Not tainted 4.4.0-21-generic #37-Ubuntu
  Apr 27 21:05:18 backup kernel: [343463.816753] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
  Apr 27 21:05:18 backup kernel: [343463.816758] Workqueue: kblockd blk_mq_run_work_fn
  Apr 27 21:05:18 backup kernel: [343463.816759]  0000000000000086 00000000010bc024 ffff88003528f7e8 ffffffff813e93c3
  Apr 27 21:05:18 backup kernel: [343463.816761]  0000000002204020 0000000000000000 ffff88003528f878 ffffffff81192fba
  Apr 27 21:05:18 backup kernel: [343463.816763]  ffff88007fff9d40 ffff88007fffb6e0 0000000000000000 ffffffff00000060
  Apr 27 21:05:18 backup kernel: [343463.816764] Call Trace:
  Apr 27 21:05:18 backup kernel: [343463.816768]  [<ffffffff813e93c3>] dump_stack+0x63/0x90
  Apr 27 21:05:18 backup kernel: [343463.816771]  [<ffffffff81192fba>] warn_alloc_failed+0xfa/0x150
  Apr 27 21:05:18 backup kernel: [343463.816774]  [<ffffffff81196b01>] __alloc_pages_nodemask+0x341/0xb60
  Apr 27 21:05:18 backup kernel: [343463.816777]  [<ffffffff810d8787>] ? vprintk_emit+0x2d7/0x520
  Apr 27 21:05:18 backup kernel: [343463.816780]  [<ffffffff811e084c>] alloc_pages_current+0x8c/0x110
  Apr 27 21:05:18 backup kernel: [343463.816782]  [<ffffffff811e992f>] new_slab+0x28f/0x490
  Apr 27 21:05:18 backup kernel: [343463.816783]  [<ffffffff811ea97b>] ___slab_alloc+0x22b/0x460
  Apr 27 21:05:18 backup kernel: [343463.816786]  [<ffffffff814bf3cd>] ? alloc_indirect.isra.4+0x1d/0x50
  Apr 27 21:05:18 backup kernel: [343463.816788]  [<ffffffff810bc8d5>] ? update_sd_lb_stats+0x115/0x520
  Apr 27 21:05:18 backup kernel: [343463.816790]  [<ffffffff814bf3cd>] ? alloc_indirect.isra.4+0x1d/0x50
  Apr 27 21:05:18 backup kernel: [343463.816791]  [<ffffffff811eabd0>] __slab_alloc+0x20/0x40
  Apr 27 21:05:18 backup kernel: [343463.816793]  [<ffffffff811ec555>] __kmalloc+0x1d5/0x250
  Apr 27 21:05:18 backup kernel: [343463.816794]  [<ffffffff814bf3cd>] alloc_indirect.isra.4+0x1d/0x50
  Apr 27 21:05:18 backup kernel: [343463.816796]  [<ffffffff814bfaaa>] virtqueue_add_sgs+0x2ca/0x3a0
  Apr 27 21:05:18 backup kernel: [343463.816798]  [<ffffffff81571b9d>] __virtblk_add_req+0xbd/0x220
  Apr 27 21:05:18 backup kernel: [343463.816801]  [<ffffffff813c0113>] ? blk_rq_map_sg+0x223/0x570
  Apr 27 21:05:18 backup kernel: [343463.816803]  [<ffffffff81571e82>] virtio_queue_rq+0x112/0x280
  Apr 27 21:05:18 backup kernel: [343463.816805]  [<ffffffff813c48c6>] __blk_mq_run_hw_queue+0x1d6/0x380
  Apr 27 21:05:18 backup kernel: [343463.816806]  [<ffffffff813c4df2>] blk_mq_run_work_fn+0x12/0x20
  Apr 27 21:05:18 backup kernel: [343463.816809]  [<ffffffff81099ff2>] process_one_work+0x162/0x480
  Apr 27 21:05:18 backup kernel: [343463.816810]  [<ffffffff8109a35b>] worker_thread+0x4b/0x4c0
  Apr 27 21:05:18 backup kernel: [343463.816812]  [<ffffffff8109a310>] ? process_one_work+0x480/0x480
  Apr 27 21:05:18 backup kernel: [343463.816813]  [<ffffffff8109a310>] ? process_one_work+0x480/0x480
  Apr 27 21:05:18 backup kernel: [343463.816815]  [<ffffffff810a0528>] kthread+0xd8/0xf0
  Apr 27 21:05:18 backup kernel: [343463.816816]  [<ffffffff810a0450>] ? kthread_create_on_node+0x1e0/0x1e0
  Apr 27 21:05:18 backup kernel: [343463.816819]  [<ffffffff8182488f>] ret_from_fork+0x3f/0x70
  Apr 27 21:05:18 backup kernel: [343463.816821]  [<ffffffff810a0450>] ? kthread_create_on_node+0x1e0/0x1e0
  Apr 27 21:05:18 backup kernel: [343463.816822] Mem-Info:
  Apr 27 21:05:18 backup kernel: [343463.816825] active_anon:43184 inactive_anon:51940 isolated_anon:0
  Apr 27 21:05:18 backup kernel: [343463.816825]  active_file:123441 inactive_file:249312 isolated_file:0
  Apr 27 21:05:18 backup kernel: [343463.816825]  unevictable:1752 dirty:32397 writeback:5123 unstable:0
  Apr 27 21:05:18 backup kernel: [343463.816825]  slab_reclaimable:18360 slab_unreclaimable:4097
  Apr 27 21:05:18 backup kernel: [343463.816825]  mapped:58673 shmem:79658 pagetables:1755 bounce:0
  Apr 27 21:05:18 backup kernel: [343463.816825]  free:12867 free_pcp:107 free_cma:0
  Apr 27 21:05:18 backup kernel: [343463.816827] Node 0 DMA free:9988kB min:40kB low:48kB high:60kB active_anon:28kB inactive_anon:396kB active_file:256kB inactive_file:884kB unevictable:92kB isolated(anon):0kB isolated(file):0kB present:15992kB managed:15908kB mlocked:92kB dirty:940kB writeback:0kB mapped:60kB shmem:316kB slab_reclaimable:3424kB slab_unreclaimable:316kB kernel_stack:192kB pagetables:60kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:532 all_unreclaimable? no
  Apr 27 21:05:18 backup kernel: [343463.816831] lowmem_reserve[]: 0 1981 1981 1981 1981
  Apr 27 21:05:18 backup kernel: [343463.816833] Node 0 DMA32 free:41480kB min:5580kB low:6972kB high:8368kB active_anon:172708kB inactive_anon:207364kB active_file:493508kB inactive_file:996364kB unevictable:6916kB isolated(anon):0kB isolated(file):0kB present:2080760kB managed:2032544kB mlocked:6916kB dirty:128648kB writeback:20492kB mapped:234632kB shmem:318316kB slab_reclaimable:70016kB slab_unreclaimable:16072kB kernel_stack:3184kB pagetables:6960kB unstable:0kB bounce:0kB free_pcp:428kB local_pcp:160kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
  Apr 27 21:05:18 backup kernel: [343463.816837] lowmem_reserve[]: 0 0 0 0 0
  Apr 27 21:05:18 backup kernel: [343463.816839] Node 0 DMA: 15*4kB (UEH) 65*8kB (UMEH) 8*16kB (UMH) 24*32kB (UMEH) 21*64kB (UMEH) 14*128kB (UMH) 7*256kB (UMH) 1*512kB (H) 1*1024kB (H) 1*2048kB (H) 0*4096kB = 9988kB
  Apr 27 21:05:18 backup kernel: [343463.816847] Node 0 DMA32: 60*4kB (H) 75*8kB (H) 64*16kB (H) 29*32kB (H) 44*64kB (H) 33*128kB (H) 20*256kB (H) 14*512kB (H) 7*1024kB (H) 6*2048kB (H) 0*4096kB = 41576kB
  Apr 27 21:05:18 backup kernel: [343463.816854] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
  Apr 27 21:05:18 backup kernel: [343463.816855] 453618 total pagecache pages
  Apr 27 21:05:18 backup kernel: [343463.816856] 317 pages in swap cache
  Apr 27 21:05:18 backup kernel: [343463.816857] Swap cache stats: add 4177, delete 3860, find 161061/161539
  Apr 27 21:05:18 backup kernel: [343463.816858] Free swap  = 1043312kB
  Apr 27 21:05:18 backup kernel: [343463.816859] Total swap = 1046524kB
  Apr 27 21:05:18 backup kernel: [343463.816860] 524188 pages RAM
  Apr 27 21:05:18 backup kernel: [343463.816860] 0 pages HighMem/MovableOnly
  Apr 27 21:05:18 backup kernel: [343463.816861] 12075 pages reserved
  Apr 27 21:05:18 backup kernel: [343463.816861] 0 pages cma reserved
  Apr 27 21:05:18 backup kernel: [343463.816862] 0 pages hwpoisoned
  Apr 27 21:05:18 backup kernel: [343463.816863] SLUB: Unable to allocate memory on node -1 (gfp=0x2080020)
  Apr 27 21:05:18 backup kernel: [343463.816865]   cache: kmalloc-2048, object size: 2048, buffer size: 2048, default order: 3, min order: 0
  Apr 27 21:05:18 backup kernel: [343463.816866]   node 0: slabs: 41, objs: 474, free: 0
  Apr 27 21:05:18 backup kernel: [343463.816872] kworker/1:1H: page allocation failure: order:0, mode:0x2204020
  Apr 27 21:05:18 backup kernel: [343463.816873] CPU: 1 PID: 154 Comm: kworker/1:1H Not tainted 4.4.0-21-generic #37-Ubuntu
  Apr 27 21:05:18 backup kernel: [343463.816874] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
  Apr 27 21:05:18 backup kernel: [343463.816875] Workqueue: kblockd blk_mq_run_work_fn
  Apr 27 21:05:18 backup kernel: [343463.816876]  0000000000000086 00000000010bc024 ffff88003528f7e8 ffffffff813e93c3
  Apr 27 21:05:18 backup kernel: [343463.816878]  0000000002204020 0000000000000000 ffff88003528f878 ffffffff81192fba
  Apr 27 21:05:18 backup kernel: [343463.816879]  ffff88007fff9d40 ffff88007fffb6e0 0000000000000000 ffffffff00000060
  Apr 27 21:05:18 backup kernel: [343463.816881] Call Trace:
  Apr 27 21:05:18 backup kernel: [343463.816882]  [<ffffffff813e93c3>] dump_stack+0x63/0x90
  Apr 27 21:05:18 backup kernel: [343463.816884]  [<ffffffff81192fba>] warn_alloc_failed+0xfa/0x150
  Apr 27 21:05:18 backup kernel: [343463.816885]  [<ffffffff81196b01>] __alloc_pages_nodemask+0x341/0xb60
  Apr 27 21:05:18 backup kernel: [343463.816888]  [<ffffffff810d8787>] ? vprintk_emit+0x2d7/0x520
  Apr 27 21:05:18 backup kernel: [343463.816890]  [<ffffffff811e084c>] alloc_pages_current+0x8c/0x110
  Apr 27 21:05:18 backup kernel: [343463.816891]  [<ffffffff811e992f>] new_slab+0x28f/0x490
  Apr 27 21:05:18 backup kernel: [343463.816893]  [<ffffffff811ea97b>] ___slab_alloc+0x22b/0x460
  Apr 27 21:05:18 backup kernel: [343463.816894]  [<ffffffff814bf3cd>] ? alloc_indirect.isra.4+0x1d/0x50
  Apr 27 21:05:18 backup kernel: [343463.816896]  [<ffffffff810bc8d5>] ? update_sd_lb_stats+0x115/0x520
  Apr 27 21:05:18 backup kernel: [343463.816897]  [<ffffffff814bf3cd>] ? alloc_indirect.isra.4+0x1d/0x50
  Apr 27 21:05:18 backup kernel: [343463.816899]  [<ffffffff811eabd0>] __slab_alloc+0x20/0x40
  Apr 27 21:05:18 backup kernel: [343463.816900]  [<ffffffff811ec555>] __kmalloc+0x1d5/0x250
  Apr 27 21:05:18 backup kernel: [343463.816901]  [<ffffffff814bf3cd>] alloc_indirect.isra.4+0x1d/0x50
  Apr 27 21:05:18 backup kernel: [343463.816903]  [<ffffffff814bfaaa>] virtqueue_add_sgs+0x2ca/0x3a0
  Apr 27 21:05:18 backup kernel: [343463.816905]  [<ffffffff81571b9d>] __virtblk_add_req+0xbd/0x220
  Apr 27 21:05:18 backup kernel: [343463.816907]  [<ffffffff813c0113>] ? blk_rq_map_sg+0x223/0x570
  Apr 27 21:05:18 backup kernel: [343463.816908]  [<ffffffff81571e82>] virtio_queue_rq+0x112/0x280
  Apr 27 21:05:18 backup kernel: [343463.816910]  [<ffffffff813c48c6>] __blk_mq_run_hw_queue+0x1d6/0x380
  Apr 27 21:05:18 backup kernel: [343463.816911]  [<ffffffff813c4df2>] blk_mq_run_work_fn+0x12/0x20
  Apr 27 21:05:18 backup kernel: [343463.816915]  [<ffffffff81099ff2>] process_one_work+0x162/0x480
  Apr 27 21:05:18 backup kernel: [343463.816916]  [<ffffffff8109a35b>] worker_thread+0x4b/0x4c0
  Apr 27 21:05:18 backup kernel: [343463.816918]  [<ffffffff8109a310>] ? process_one_work+0x480/0x480
  Apr 27 21:05:18 backup kernel: [343463.816919]  [<ffffffff8109a310>] ? process_one_work+0x480/0x480
  Apr 27 21:05:18 backup kernel: [343463.816921]  [<ffffffff810a0528>] kthread+0xd8/0xf0
  Apr 27 21:05:18 backup kernel: [343463.816922]  [<ffffffff810a0450>] ? kthread_create_on_node+0x1e0/0x1e0
  Apr 27 21:05:18 backup kernel: [343463.816924]  [<ffffffff8182488f>] ret_from_fork+0x3f/0x70
  Apr 27 21:05:18 backup kernel: [343463.816925]  [<ffffffff810a0450>] ? kthread_create_on_node+0x1e0/0x1e0
  Apr 27 21:05:18 backup kernel: [343463.816926] Mem-Info:
  Apr 27 21:05:18 backup kernel: [343463.816929] active_anon:43184 inactive_anon:51940 isolated_anon:0
  Apr 27 21:05:18 backup kernel: [343463.816929]  active_file:123441 inactive_file:249312 isolated_file:0
  Apr 27 21:05:18 backup kernel: [343463.816929]  unevictable:1752 dirty:32397 writeback:5123 unstable:0
  Apr 27 21:05:18 backup kernel: [343463.816929]  slab_reclaimable:18360 slab_unreclaimable:4097
  Apr 27 21:05:18 backup kernel: [343463.816929]  mapped:58673 shmem:79658 pagetables:1755 bounce:0
  Apr 27 21:05:18 backup kernel: [343463.816929]  free:12867 free_pcp:107 free_cma:0
  Apr 27 21:05:18 backup kernel: [343463.816931] Node 0 DMA free:9988kB min:40kB low:48kB high:60kB active_anon:28kB inactive_anon:396kB active_file:256kB inactive_file:884kB unevictable:92kB isolated(anon):0kB isolated(file):0kB present:15992kB managed:15908kB mlocked:92kB dirty:940kB writeback:0kB mapped:60kB shmem:316kB slab_reclaimable:3424kB slab_unreclaimable:316kB kernel_stack:192kB pagetables:60kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:532 all_unreclaimable? no
  Apr 27 21:05:18 backup kernel: [343463.816938] lowmem_reserve[]: 0 1981 1981 1981 1981
  Apr 27 21:05:18 backup kernel: [343463.816940] Node 0 DMA32 free:41480kB min:5580kB low:6972kB high:8368kB active_anon:172708kB inactive_anon:207364kB active_file:493508kB inactive_file:996364kB unevictable:6916kB isolated(anon):0kB isolated(file):0kB present:2080760kB managed:2032544kB mlocked:6916kB dirty:128648kB writeback:20492kB mapped:234632kB shmem:318316kB slab_reclaimable:70016kB slab_unreclaimable:16072kB kernel_stack:3184kB pagetables:6960kB unstable:0kB bounce:0kB free_pcp:428kB local_pcp:160kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
  Apr 27 21:05:18 backup kernel: [343463.816943] lowmem_reserve[]: 0 0 0 0 0
  Apr 27 21:05:18 backup kernel: [343463.816945] Node 0 DMA: 15*4kB (UEH) 65*8kB (UMEH) 8*16kB (UMH) 24*32kB (UMEH) 21*64kB (UMEH) 14*128kB (UMH) 7*256kB (UMH) 1*512kB (H) 1*1024kB (H) 1*2048kB (H) 0*4096kB = 9988kB
  Apr 27 21:05:18 backup kernel: [343463.816952] Node 0 DMA32: 60*4kB (H) 75*8kB (H) 64*16kB (H) 29*32kB (H) 44*64kB (H) 33*128kB (H) 20*256kB (H) 14*512kB (H) 7*1024kB (H) 6*2048kB (H) 0*4096kB = 41576kB
  Apr 27 21:05:18 backup kernel: [343463.816960] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
  Apr 27 21:05:18 backup kernel: [343463.816960] 453618 total pagecache pages
  Apr 27 21:05:18 backup kernel: [343463.816961] 317 pages in swap cache
  Apr 27 21:05:18 backup kernel: [343463.816962] Swap cache stats: add 4177, delete 3860, find 161061/161539
  Apr 27 21:05:18 backup kernel: [343463.816963] Free swap  = 1043312kB
  Apr 27 21:05:18 backup kernel: [343463.816963] Total swap = 1046524kB
  Apr 27 21:05:18 backup kernel: [343463.816964] 524188 pages RAM
  Apr 27 21:05:18 backup kernel: [343463.816965] 0 pages HighMem/MovableOnly
  Apr 27 21:05:18 backup kernel: [343463.816965] 12075 pages reserved
  Apr 27 21:05:18 backup kernel: [343463.816966] 0 pages cma reserved
  Apr 27 21:05:18 backup kernel: [343463.816966] 0 pages hwpoisoned

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-21-generic 4.4.0-21.37
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k4.4.0-21-generic.
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
  Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
  Date: Thu Apr 28 08:53:40 2016
  HibernationDevice: RESUME=UUID=b13cd3f3-9607-4bcc-8ce7-78efe89b82b6
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
   
   tun0      no wireless extensions.
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Bochs Bochs
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 qxldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic root=UUID=0fdb77e4-84b1-4b4c-b681-f6c7b0fab4d2 ro elevator=deadline
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-04-21 (7 days ago)
  dmi.bios.date: 01/01/2011
  dmi.bios.vendor: Bochs
  dmi.bios.version: Bochs
  dmi.chassis.type: 1
  dmi.chassis.vendor: Bochs
  dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2011:svnBochs:pnBochs:pvr:cvnBochs:ct1:cvr:
  dmi.product.name: Bochs
  dmi.sys.vendor: Bochs

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1576297/+subscriptions
References

[Bug 1576297] [NEW] BTRFS Page allocation failure with Bacula.
From: MikeB, 2016-04-28