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[Destitutus <didrive@xxxxxxx>]

Public bug reported:

Kernel panic happens after mount and ls specific btrfs image

Way to reproduce:
1. download and unpack btrfs image from tar(sparse file)(tar -Sxf img.tar)
2. mount btrfs (sudo mount -t btrfs -o rw,noatime,compress=no,commit=5 71bb49cf-26f1-484a-832c-e966f43adca9.img broken)
3. list files in mount point (ls -al broken)

the system down to kernel panic with log above

(looks like 3.19.x and 4.2.x not affected, only 4.4.x)

dmesg log:
May 31 13:02:21 fs-new kernel: [  694.744630] BTRFS error (device loop0): parent transid verify failed on 30425088 wanted 120 found 119
May 31 13:02:21 fs-new kernel: [  694.747077] BTRFS error (device loop0): parent transid verify failed on 30425088 wanted 120 found 119
May 31 13:02:21 fs-new kernel: [  694.747128] ------------[ cut here ]------------
May 31 13:02:21 fs-new kernel: [  694.747135] WARNING: CPU: 0 PID: 13795 at /build/linux-lts-xenial-7RlTta/linux-lts-xenial-4.4.0/lib/idr.c:1051 ida_remove+0xfa/0x130()
May 31 13:02:21 fs-new kernel: [  694.747136] ida_remove called for id=47 which is not allocated.
May 31 13:02:21 fs-new kernel: [  694.747137] Modules linked in: ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c nfsv3 vboxsf xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack zram lz4_compress xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables autofs4 ppdev vboxvideo ttm crct10dif_pclmul crc32_pclmul drm_kms_helper drm aesni_intel aes_x86_64 lrw input_leds gf128mul nfsd glue_helper ablk_helper cryptd auth_rpcgss serio_raw nfs_acl nfs fb_sys_fops syscopyarea lockd sysfillrect grace 8250_fintek parport_pc sysimgblt vboxguest i2c_piix4 sunrpc video mac_hid fscache lp parport zfs(POE) zunicode(POE) zcommon(POE) znvpair(POE) spl(OE) zavl(POE) btrfs xor raid6_pq psmouse e1000 fjes pata_acpi
May 31 13:02:21 fs-new kernel: [  694.747182] CPU: 0 PID: 13795 Comm: ls Tainted: P           OE   4.4.0-22-generic #40~14.04.1-Ubuntu
May 31 13:02:21 fs-new kernel: [  694.747183] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
May 31 13:02:21 fs-new kernel: [  694.747185]  0000000000000000 ffff8800024e7a88 ffffffff813cde6c ffff8800024e7ad0
May 31 13:02:21 fs-new kernel: [  694.747187]  ffffffff81af5298 ffff8800024e7ac0 ffffffff8107d856 0000000000000000
May 31 13:02:21 fs-new kernel: [  694.747189]  ffffffff81fce200 ffff88003c827a00 ffff88003616e068 0000000000000001
May 31 13:02:21 fs-new kernel: [  694.747191] Call Trace:
May 31 13:02:21 fs-new kernel: [  694.747195]  [<ffffffff813cde6c>] dump_stack+0x63/0x87
May 31 13:02:21 fs-new kernel: [  694.747199]  [<ffffffff8107d856>] warn_slowpath_common+0x86/0xc0
May 31 13:02:21 fs-new kernel: [  694.747201]  [<ffffffff8107d8dc>] warn_slowpath_fmt+0x4c/0x50
May 31 13:02:21 fs-new kernel: [  694.747214]  [<ffffffff811a337a>] ? free_percpu+0xba/0x180
May 31 13:02:21 fs-new kernel: [  694.747217]  [<ffffffff813cef0a>] ida_remove+0xfa/0x130
May 31 13:02:21 fs-new kernel: [  694.747220]  [<ffffffff811fff4c>] free_anon_bdev+0x2c/0x50
May 31 13:02:21 fs-new kernel: [  694.747239]  [<ffffffffc00f234e>] free_fs_root+0xbe/0xe0 [btrfs]
May 31 13:02:21 fs-new kernel: [  694.747251]  [<ffffffffc00f3b96>] btrfs_get_fs_root+0x216/0x250 [btrfs]
May 31 13:02:21 fs-new kernel: [  694.747264]  [<ffffffffc011d92d>] ? memcmp_extent_buffer+0xbd/0x120 [btrfs]
May 31 13:02:21 fs-new kernel: [  694.747277]  [<ffffffffc0106e4c>] btrfs_lookup_dentry+0x28c/0x4c0 [btrfs]
May 31 13:02:21 fs-new kernel: [  694.747288]  [<ffffffffc0107092>] btrfs_lookup+0x12/0x40 [btrfs]
May 31 13:02:21 fs-new kernel: [  694.747291]  [<ffffffff8120716d>] lookup_real+0x1d/0x50
May 31 13:02:21 fs-new kernel: [  694.747293]  [<ffffffff81207523>] __lookup_hash+0x33/0x40
May 31 13:02:21 fs-new kernel: [  694.747295]  [<ffffffff81209a47>] walk_component+0x177/0x280
May 31 13:02:21 fs-new kernel: [  694.747297]  [<ffffffff8125c0d9>] ? posix_acl_xattr_get+0x49/0xb0
May 31 13:02:21 fs-new kernel: [  694.747299]  [<ffffffff8120ae80>] path_lookupat+0x60/0x110
May 31 13:02:21 fs-new kernel: [  694.747301]  [<ffffffff8120ca4c>] filename_lookup+0x9c/0x150
May 31 13:02:21 fs-new kernel: [  694.747304]  [<ffffffff811dbc2f>] ? kmem_cache_alloc+0x19f/0x200
May 31 13:02:21 fs-new kernel: [  694.747306]  [<ffffffff8120c68f>] ? getname_flags+0x4f/0x1f0
May 31 13:02:21 fs-new kernel: [  694.747308]  [<ffffffff8120cbb6>] user_path_at_empty+0x36/0x40
May 31 13:02:21 fs-new kernel: [  694.747310]  [<ffffffff81202523>] vfs_fstatat+0x53/0xa0
May 31 13:02:21 fs-new kernel: [  694.747312]  [<ffffffff812029e2>] SYSC_newlstat+0x22/0x40
May 31 13:02:21 fs-new kernel: [  694.747315]  [<ffffffff8121cf04>] ? mntput+0x24/0x40
May 31 13:02:21 fs-new kernel: [  694.747317]  [<ffffffff812071be>] ? path_put+0x1e/0x30
May 31 13:02:21 fs-new kernel: [  694.747318]  [<ffffffff812220e2>] ? path_getxattr+0x62/0x90
May 31 13:02:21 fs-new kernel: [  694.747321]  [<ffffffff81202bfe>] SyS_newlstat+0xe/0x10
May 31 13:02:21 fs-new kernel: [  694.747324]  [<ffffffff817efcf6>] entry_SYSCALL_64_fastpath+0x16/0x75
May 31 13:02:21 fs-new kernel: [  694.747326] ---[ end trace 5c7309d2219a269a ]---
May 31 13:02:21 fs-new kernel: [  694.761474] Modules linked in: ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c nfsv3 vboxsf xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack zram lz4_compress xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables autofs4 ppdev vboxvideo ttm crct10dif_pclmul crc32_pclmul drm_kms_helper drm aesni_intel aes_x86_64 lrw input_leds gf128mul nfsd glue_helper ablk_helper cryptd auth_rpcgss serio_raw nfs_acl nfs fb_sys_fops syscopyarea lockd sysfillrect grace 8250_fintek parport_pc sysimgblt vboxguest i2c_piix4 sunrpc video mac_hid fscache lp parport zfs(POE) zunicode(POE) zcommon(POE) znvpair(POE) spl(OE) zavl(POE) btrfs xor raid6_pq psmouse e1000 fjes pata_acpi
May 31 13:02:21 fs-new kernel: [  694.763145] CPU: 0 PID: 13581 Comm: zsh Tainted: P        W  OE   4.4.0-22-generic #40~14.04.1-Ubuntu
May 31 13:02:21 fs-new kernel: [  694.763207] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
May 31 13:02:21 fs-new kernel: [  694.763261] task: ffff880038485280 ti: ffff88001c104000 task.ti: ffff88001c104000
May 31 13:02:21 fs-new kernel: [  694.763307] RIP: 0010:[<ffffffff811dbb09>]  [<ffffffff811dbb09>] kmem_cache_alloc+0x79/0x200
May 31 13:02:21 fs-new kernel: [  694.763654] RSP: 0018:ffff88001c107d38  EFLAGS: 00010282
May 31 13:02:21 fs-new kernel: [  694.763689] RAX: 0000000000000000 RBX: 0000000002000200 RCX: 00000000005306fe
May 31 13:02:21 fs-new kernel: [  694.763733] RDX: 00000000005306fd RSI: 0000000002000200 RDI: ffff88003c801b00
May 31 13:02:21 fs-new kernel: [  694.763777] RBP: ffff88001c107d68 R08: 0000000000019f80 R09: ffffffff811bda0d
May 31 13:02:21 fs-new kernel: [  694.763820] R10: 0000000000000000 R11: ffffffff81ac9018 R12: 0000000002000200
May 31 13:02:21 fs-new kernel: [  694.763862] R13: 53f000ff53f000ff R14: ffff88003c801b00 R15: ffff88003c801b00
May 31 13:02:21 fs-new kernel: [  694.763908] FS:  00007f73347c4740(0000) GS:ffff88003e400000(0000) knlGS:0000000000000000
May 31 13:02:21 fs-new kernel: [  694.763958] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
May 31 13:02:21 fs-new kernel: [  694.763993] CR2: 0000000000ec7ba8 CR3: 0000000002445000 CR4: 00000000000406f0
May 31 13:02:21 fs-new kernel: [  694.764043] Stack:
May 31 13:02:21 fs-new kernel: [  694.764059]  ffffffff81fc7220 ffff88001c0807d0 ffff880002440380 0000000000000000
May 31 13:02:21 fs-new kernel: [  694.764113]  0000000000000001 ffff880035ea3a98 ffff88001c107dc0 ffffffff811bda0d
May 31 13:02:21 fs-new kernel: [  694.764166]  ffff88000241e4b0 ffff88001c080848 ffff88000241e528 0000000000000000
May 31 13:02:21 fs-new kernel: [  694.764219] Call Trace:
May 31 13:02:21 fs-new kernel: [  694.764243]  [<ffffffff811bda0d>] anon_vma_clone+0x6d/0x1f0
May 31 13:02:21 fs-new kernel: [  694.764280]  [<ffffffff811bdbc0>] anon_vma_fork+0x30/0x130
May 31 13:02:21 fs-new kernel: [  694.766727]  [<ffffffff8107bcf6>] copy_process+0xe36/0x1c60
May 31 13:02:21 fs-new kernel: [  694.767979]  [<ffffffff8107cc92>] _do_fork+0x82/0x310
May 31 13:02:21 fs-new kernel: [  694.771206]  [<ffffffff8108c931>] ? sigprocmask+0x51/0x80
May 31 13:02:21 fs-new kernel: [  694.774372]  [<ffffffff8107cfc9>] SyS_clone+0x19/0x20
May 31 13:02:21 fs-new kernel: [  694.775874]  [<ffffffff817efcf6>] entry_SYSCALL_64_fastpath+0x16/0x75
May 31 13:02:21 fs-new kernel: [  694.776895] Code: 4c 03 05 83 e6 e2 7e 4d 8b 28 49 8b 40 10 4d 85 ed 0f 84 43 01 00 00 48 85 c0 0f 84 3a 01 00 00 49 63 46 20 48 8d 4a 01 4d 8b 06 <49> 8b 5c 05 00 4c 89 e8 65 49 0f c7 08 0f 94 c0 84 c0 74 b8 49
May 31 13:02:21 fs-new kernel: [  694.779447] RIP  [<ffffffff811dbb09>] kmem_cache_alloc+0x79/0x200
May 31 13:02:21 fs-new kernel: [  694.780143]  RSP <ffff88001c107d38>
May 31 13:02:21 fs-new kernel: [  694.780965] fbcon_switch: detected unhandled fb_set_par error, error code -16
May 31 13:02:21 fs-new kernel: [  694.782726] fbcon_switch: detected unhandled fb_set_par error, error code -16
May 31 13:02:21 fs-new kernel: [  694.784621] ---[ end trace 5c7309d2219a269b ]---


Kernel: Ubuntu 4.4.0-22.40~14.04.1-generic 4.4.8
Release: Description:	Ubuntu 14.04.3 LTS, Release:	14.04
Btrfs-tools version:
Installed: 3.12-1
  Candidate: 3.12-1ubuntu0.1
  Version table:
     3.12-1ubuntu0.1 0
        500 http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
 *** 3.12-1 0
        500 http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "img.tar"
   https://bugs.launchpad.net/bugs/1587475/+attachment/4673429/+files/img.tar

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https://bugs.launchpad.net/bugs/1587475

Title:
  Kernel panic on btrfs mount and ls

Status in linux package in Ubuntu:
  New

Bug description:
  Kernel panic happens after mount and ls specific btrfs image

  Way to reproduce:
  1. download and unpack btrfs image from tar(sparse file)(tar -Sxf img.tar)
  2. mount btrfs (sudo mount -t btrfs -o rw,noatime,compress=no,commit=5 71bb49cf-26f1-484a-832c-e966f43adca9.img broken)
  3. list files in mount point (ls -al broken)

  the system down to kernel panic with log above

  (looks like 3.19.x and 4.2.x not affected, only 4.4.x)

  dmesg log:
  May 31 13:02:21 fs-new kernel: [  694.744630] BTRFS error (device loop0): parent transid verify failed on 30425088 wanted 120 found 119
  May 31 13:02:21 fs-new kernel: [  694.747077] BTRFS error (device loop0): parent transid verify failed on 30425088 wanted 120 found 119
  May 31 13:02:21 fs-new kernel: [  694.747128] ------------[ cut here ]------------
  May 31 13:02:21 fs-new kernel: [  694.747135] WARNING: CPU: 0 PID: 13795 at /build/linux-lts-xenial-7RlTta/linux-lts-xenial-4.4.0/lib/idr.c:1051 ida_remove+0xfa/0x130()
  May 31 13:02:21 fs-new kernel: [  694.747136] ida_remove called for id=47 which is not allocated.
  May 31 13:02:21 fs-new kernel: [  694.747137] Modules linked in: ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c nfsv3 vboxsf xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack zram lz4_compress xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables autofs4 ppdev vboxvideo ttm crct10dif_pclmul crc32_pclmul drm_kms_helper drm aesni_intel aes_x86_64 lrw input_leds gf128mul nfsd glue_helper ablk_helper cryptd auth_rpcgss serio_raw nfs_acl nfs fb_sys_fops syscopyarea lockd sysfillrect grace 8250_fintek parport_pc sysimgblt vboxguest i2c_piix4 sunrpc video mac_hid fscache lp parport zfs(POE) zunicode(POE) zcommon(POE) znvpair(POE) spl(OE) zavl(POE) btrfs xor raid6_pq psmouse e1000 fjes pata_acpi
  May 31 13:02:21 fs-new kernel: [  694.747182] CPU: 0 PID: 13795 Comm: ls Tainted: P           OE   4.4.0-22-generic #40~14.04.1-Ubuntu
  May 31 13:02:21 fs-new kernel: [  694.747183] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
  May 31 13:02:21 fs-new kernel: [  694.747185]  0000000000000000 ffff8800024e7a88 ffffffff813cde6c ffff8800024e7ad0
  May 31 13:02:21 fs-new kernel: [  694.747187]  ffffffff81af5298 ffff8800024e7ac0 ffffffff8107d856 0000000000000000
  May 31 13:02:21 fs-new kernel: [  694.747189]  ffffffff81fce200 ffff88003c827a00 ffff88003616e068 0000000000000001
  May 31 13:02:21 fs-new kernel: [  694.747191] Call Trace:
  May 31 13:02:21 fs-new kernel: [  694.747195]  [<ffffffff813cde6c>] dump_stack+0x63/0x87
  May 31 13:02:21 fs-new kernel: [  694.747199]  [<ffffffff8107d856>] warn_slowpath_common+0x86/0xc0
  May 31 13:02:21 fs-new kernel: [  694.747201]  [<ffffffff8107d8dc>] warn_slowpath_fmt+0x4c/0x50
  May 31 13:02:21 fs-new kernel: [  694.747214]  [<ffffffff811a337a>] ? free_percpu+0xba/0x180
  May 31 13:02:21 fs-new kernel: [  694.747217]  [<ffffffff813cef0a>] ida_remove+0xfa/0x130
  May 31 13:02:21 fs-new kernel: [  694.747220]  [<ffffffff811fff4c>] free_anon_bdev+0x2c/0x50
  May 31 13:02:21 fs-new kernel: [  694.747239]  [<ffffffffc00f234e>] free_fs_root+0xbe/0xe0 [btrfs]
  May 31 13:02:21 fs-new kernel: [  694.747251]  [<ffffffffc00f3b96>] btrfs_get_fs_root+0x216/0x250 [btrfs]
  May 31 13:02:21 fs-new kernel: [  694.747264]  [<ffffffffc011d92d>] ? memcmp_extent_buffer+0xbd/0x120 [btrfs]
  May 31 13:02:21 fs-new kernel: [  694.747277]  [<ffffffffc0106e4c>] btrfs_lookup_dentry+0x28c/0x4c0 [btrfs]
  May 31 13:02:21 fs-new kernel: [  694.747288]  [<ffffffffc0107092>] btrfs_lookup+0x12/0x40 [btrfs]
  May 31 13:02:21 fs-new kernel: [  694.747291]  [<ffffffff8120716d>] lookup_real+0x1d/0x50
  May 31 13:02:21 fs-new kernel: [  694.747293]  [<ffffffff81207523>] __lookup_hash+0x33/0x40
  May 31 13:02:21 fs-new kernel: [  694.747295]  [<ffffffff81209a47>] walk_component+0x177/0x280
  May 31 13:02:21 fs-new kernel: [  694.747297]  [<ffffffff8125c0d9>] ? posix_acl_xattr_get+0x49/0xb0
  May 31 13:02:21 fs-new kernel: [  694.747299]  [<ffffffff8120ae80>] path_lookupat+0x60/0x110
  May 31 13:02:21 fs-new kernel: [  694.747301]  [<ffffffff8120ca4c>] filename_lookup+0x9c/0x150
  May 31 13:02:21 fs-new kernel: [  694.747304]  [<ffffffff811dbc2f>] ? kmem_cache_alloc+0x19f/0x200
  May 31 13:02:21 fs-new kernel: [  694.747306]  [<ffffffff8120c68f>] ? getname_flags+0x4f/0x1f0
  May 31 13:02:21 fs-new kernel: [  694.747308]  [<ffffffff8120cbb6>] user_path_at_empty+0x36/0x40
  May 31 13:02:21 fs-new kernel: [  694.747310]  [<ffffffff81202523>] vfs_fstatat+0x53/0xa0
  May 31 13:02:21 fs-new kernel: [  694.747312]  [<ffffffff812029e2>] SYSC_newlstat+0x22/0x40
  May 31 13:02:21 fs-new kernel: [  694.747315]  [<ffffffff8121cf04>] ? mntput+0x24/0x40
  May 31 13:02:21 fs-new kernel: [  694.747317]  [<ffffffff812071be>] ? path_put+0x1e/0x30
  May 31 13:02:21 fs-new kernel: [  694.747318]  [<ffffffff812220e2>] ? path_getxattr+0x62/0x90
  May 31 13:02:21 fs-new kernel: [  694.747321]  [<ffffffff81202bfe>] SyS_newlstat+0xe/0x10
  May 31 13:02:21 fs-new kernel: [  694.747324]  [<ffffffff817efcf6>] entry_SYSCALL_64_fastpath+0x16/0x75
  May 31 13:02:21 fs-new kernel: [  694.747326] ---[ end trace 5c7309d2219a269a ]---
  May 31 13:02:21 fs-new kernel: [  694.761474] Modules linked in: ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c nfsv3 vboxsf xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack zram lz4_compress xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables autofs4 ppdev vboxvideo ttm crct10dif_pclmul crc32_pclmul drm_kms_helper drm aesni_intel aes_x86_64 lrw input_leds gf128mul nfsd glue_helper ablk_helper cryptd auth_rpcgss serio_raw nfs_acl nfs fb_sys_fops syscopyarea lockd sysfillrect grace 8250_fintek parport_pc sysimgblt vboxguest i2c_piix4 sunrpc video mac_hid fscache lp parport zfs(POE) zunicode(POE) zcommon(POE) znvpair(POE) spl(OE) zavl(POE) btrfs xor raid6_pq psmouse e1000 fjes pata_acpi
  May 31 13:02:21 fs-new kernel: [  694.763145] CPU: 0 PID: 13581 Comm: zsh Tainted: P        W  OE   4.4.0-22-generic #40~14.04.1-Ubuntu
  May 31 13:02:21 fs-new kernel: [  694.763207] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
  May 31 13:02:21 fs-new kernel: [  694.763261] task: ffff880038485280 ti: ffff88001c104000 task.ti: ffff88001c104000
  May 31 13:02:21 fs-new kernel: [  694.763307] RIP: 0010:[<ffffffff811dbb09>]  [<ffffffff811dbb09>] kmem_cache_alloc+0x79/0x200
  May 31 13:02:21 fs-new kernel: [  694.763654] RSP: 0018:ffff88001c107d38  EFLAGS: 00010282
  May 31 13:02:21 fs-new kernel: [  694.763689] RAX: 0000000000000000 RBX: 0000000002000200 RCX: 00000000005306fe
  May 31 13:02:21 fs-new kernel: [  694.763733] RDX: 00000000005306fd RSI: 0000000002000200 RDI: ffff88003c801b00
  May 31 13:02:21 fs-new kernel: [  694.763777] RBP: ffff88001c107d68 R08: 0000000000019f80 R09: ffffffff811bda0d
  May 31 13:02:21 fs-new kernel: [  694.763820] R10: 0000000000000000 R11: ffffffff81ac9018 R12: 0000000002000200
  May 31 13:02:21 fs-new kernel: [  694.763862] R13: 53f000ff53f000ff R14: ffff88003c801b00 R15: ffff88003c801b00
  May 31 13:02:21 fs-new kernel: [  694.763908] FS:  00007f73347c4740(0000) GS:ffff88003e400000(0000) knlGS:0000000000000000
  May 31 13:02:21 fs-new kernel: [  694.763958] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  May 31 13:02:21 fs-new kernel: [  694.763993] CR2: 0000000000ec7ba8 CR3: 0000000002445000 CR4: 00000000000406f0
  May 31 13:02:21 fs-new kernel: [  694.764043] Stack:
  May 31 13:02:21 fs-new kernel: [  694.764059]  ffffffff81fc7220 ffff88001c0807d0 ffff880002440380 0000000000000000
  May 31 13:02:21 fs-new kernel: [  694.764113]  0000000000000001 ffff880035ea3a98 ffff88001c107dc0 ffffffff811bda0d
  May 31 13:02:21 fs-new kernel: [  694.764166]  ffff88000241e4b0 ffff88001c080848 ffff88000241e528 0000000000000000
  May 31 13:02:21 fs-new kernel: [  694.764219] Call Trace:
  May 31 13:02:21 fs-new kernel: [  694.764243]  [<ffffffff811bda0d>] anon_vma_clone+0x6d/0x1f0
  May 31 13:02:21 fs-new kernel: [  694.764280]  [<ffffffff811bdbc0>] anon_vma_fork+0x30/0x130
  May 31 13:02:21 fs-new kernel: [  694.766727]  [<ffffffff8107bcf6>] copy_process+0xe36/0x1c60
  May 31 13:02:21 fs-new kernel: [  694.767979]  [<ffffffff8107cc92>] _do_fork+0x82/0x310
  May 31 13:02:21 fs-new kernel: [  694.771206]  [<ffffffff8108c931>] ? sigprocmask+0x51/0x80
  May 31 13:02:21 fs-new kernel: [  694.774372]  [<ffffffff8107cfc9>] SyS_clone+0x19/0x20
  May 31 13:02:21 fs-new kernel: [  694.775874]  [<ffffffff817efcf6>] entry_SYSCALL_64_fastpath+0x16/0x75
  May 31 13:02:21 fs-new kernel: [  694.776895] Code: 4c 03 05 83 e6 e2 7e 4d 8b 28 49 8b 40 10 4d 85 ed 0f 84 43 01 00 00 48 85 c0 0f 84 3a 01 00 00 49 63 46 20 48 8d 4a 01 4d 8b 06 <49> 8b 5c 05 00 4c 89 e8 65 49 0f c7 08 0f 94 c0 84 c0 74 b8 49
  May 31 13:02:21 fs-new kernel: [  694.779447] RIP  [<ffffffff811dbb09>] kmem_cache_alloc+0x79/0x200
  May 31 13:02:21 fs-new kernel: [  694.780143]  RSP <ffff88001c107d38>
  May 31 13:02:21 fs-new kernel: [  694.780965] fbcon_switch: detected unhandled fb_set_par error, error code -16
  May 31 13:02:21 fs-new kernel: [  694.782726] fbcon_switch: detected unhandled fb_set_par error, error code -16
  May 31 13:02:21 fs-new kernel: [  694.784621] ---[ end trace 5c7309d2219a269b ]---

  
  Kernel: Ubuntu 4.4.0-22.40~14.04.1-generic 4.4.8
  Release: Description:	Ubuntu 14.04.3 LTS, Release:	14.04
  Btrfs-tools version:
  Installed: 3.12-1
    Candidate: 3.12-1ubuntu0.1
    Version table:
       3.12-1ubuntu0.1 0
          500 http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
   *** 3.12-1 0
          500 http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

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