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["S. W." <cebit2006@xxxxxxxxxxxx>]

Public bug reported:

root@-Storage:~# uname -a
Linux -Storage 4.4.0-22-generic #39-Ubuntu SMP Thu May 5 16:53:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
root@-Storage:~# lsb_release -rd
Description:	Ubuntu 16.04 LTS
Release:	16.04
root@WVK-Storage:~# apt-cache policy samba
samba:
  Installiert:           2:4.3.9+dfsg-0ubuntu0.16.04.1
  Installationskandidat: 2:4.3.9+dfsg-0ubuntu0.16.04.1
  Versionstabelle:
 *** 2:4.3.9+dfsg-0ubuntu0.16.04.1 500
        500 http://de.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
        100 /var/lib/dpkg/status
     2:4.3.8+dfsg-0ubuntu1 500
        500 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 Packages


[ 1680.385467] INFO: task smbd:1982 blocked for more than 120 seconds.
[ 1680.385474]       Not tainted 4.4.0-22-generic #39-Ubuntu
[ 1680.385476] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1680.385477] smbd            D ffff8800869ebac8     0  1982   1275 0x00000000
[ 1680.385482]  ffff8800869ebac8 ffff8800869eba98 ffffffff81e11500 ffff8800b7c91900
[ 1680.385485]  ffff8800869ec000 ffff88013fc16d00 7fffffffffffffff ffffffff818219f0
[ 1680.385487]  ffff8800869ebc20 ffff8800869ebae0 ffffffff818211f5 0000000000000000
[ 1680.385489] Call Trace:
[ 1680.385498]  [<ffffffff818219f0>] ? bit_wait+0x60/0x60
[ 1680.385500]  [<ffffffff818211f5>] schedule+0x35/0x80
[ 1680.385502]  [<ffffffff81824315>] schedule_timeout+0x1b5/0x270
[ 1680.385595]  [<ffffffffc019786e>] ? merge_state.part.34+0x12e/0x140 [btrfs]
[ 1680.385609]  [<ffffffffc01975cf>] ? free_extent_state+0x3f/0xa0 [btrfs]
[ 1680.385613]  [<ffffffff8106426e>] ? kvm_clock_get_cycles+0x1e/0x20
[ 1680.385617]  [<ffffffff810f574c>] ? ktime_get+0x3c/0xb0
[ 1680.385619]  [<ffffffff818219f0>] ? bit_wait+0x60/0x60
[ 1680.385620]  [<ffffffff81820744>] io_schedule_timeout+0xa4/0x110
[ 1680.385622]  [<ffffffff81821a0b>] bit_wait_io+0x1b/0x70
[ 1680.385624]  [<ffffffff8182159d>] __wait_on_bit+0x5d/0x90
[ 1680.385627]  [<ffffffff8118cadb>] wait_on_page_bit+0xcb/0xf0
[ 1680.385631]  [<ffffffff810c3ab0>] ? autoremove_wake_function+0x40/0x40
[ 1680.385644]  [<ffffffffc018c54d>] prepare_pages+0x17d/0x190 [btrfs]
[ 1680.385658]  [<ffffffffc018d11c>] __btrfs_buffered_write+0x20c/0x5f0 [btrfs]
[ 1680.385672]  [<ffffffffc01909e1>] btrfs_file_write_iter+0x171/0x560 [btrfs]
[ 1680.385676]  [<ffffffff811eb207>] ? kmem_cache_alloc+0x187/0x1f0
[ 1680.385679]  [<ffffffff8121c006>] ? getname_flags+0x56/0x1f0
[ 1680.385682]  [<ffffffff8120c04b>] new_sync_write+0x9b/0xe0
[ 1680.385684]  [<ffffffff8120c0b6>] __vfs_write+0x26/0x40
[ 1680.385685]  [<ffffffff8120ca39>] vfs_write+0xa9/0x1a0
[ 1680.385687]  [<ffffffff8120d6f5>] SyS_write+0x55/0xc0
[ 1680.385690]  [<ffffffff818252f2>] entry_SYSCALL_64_fastpath+0x16/0x71
[ 1800.385475] INFO: task smbd:1974 blocked for more than 120 seconds.
[ 1800.385482]       Not tainted 4.4.0-22-generic #39-Ubuntu
[ 1800.385483] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1800.385485] smbd            D ffff880099da3d08     0  1974   1275 0x00000000
[ 1800.385490]  ffff880099da3d08 ffffffff8122d1e4 ffff88013a400000 ffff8800b7c94b00
[ 1800.385492]  ffff880099da4000 ffff8800b92fd1fc ffff8800b7c94b00 00000000ffffffff
[ 1800.385494]  ffff8800b92fd200 ffff880099da3d20 ffffffff818211f5 ffff8800b92fd1f8
[ 1800.385496] Call Trace:
[ 1800.385505]  [<ffffffff8122d1e4>] ? mntput+0x24/0x40
[ 1800.385510]  [<ffffffff818211f5>] schedule+0x35/0x80
[ 1800.385512]  [<ffffffff8182149e>] schedule_preempt_disabled+0xe/0x10
[ 1800.385514]  [<ffffffff818230d9>] __mutex_lock_slowpath+0xb9/0x130
[ 1800.385516]  [<ffffffff8182316f>] mutex_lock+0x1f/0x30
[ 1800.385555]  [<ffffffffc01908d1>] btrfs_file_write_iter+0x61/0x560 [btrfs]
[ 1800.385559]  [<ffffffff811eb207>] ? kmem_cache_alloc+0x187/0x1f0
[ 1800.385562]  [<ffffffff8121c006>] ? getname_flags+0x56/0x1f0
[ 1800.385564]  [<ffffffff812115fe>] ? inode_get_bytes+0x1e/0x50
[ 1800.385567]  [<ffffffff8120c04b>] new_sync_write+0x9b/0xe0
[ 1800.385568]  [<ffffffff8120c0b6>] __vfs_write+0x26/0x40
[ 1800.385570]  [<ffffffff8120ca39>] vfs_write+0xa9/0x1a0
[ 1800.385572]  [<ffffffff8120d6f5>] SyS_write+0x55/0xc0
[ 1800.385575]  [<ffffffff818252f2>] entry_SYSCALL_64_fastpath+0x16/0x71
[ 1800.385576] INFO: task smbd:1982 blocked for more than 120 seconds.
[ 1800.385578]       Not tainted 4.4.0-22-generic #39-Ubuntu
[ 1800.385579] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1800.385580] smbd            D ffff8800869ebac8     0  1982   1275 0x00000000
[ 1800.385582]  ffff8800869ebac8 ffff8800869eba98 ffffffff81e11500 ffff8800b7c91900
[ 1800.385584]  ffff8800869ec000 ffff88013fc16d00 7fffffffffffffff ffffffff818219f0
[ 1800.385586]  ffff8800869ebc20 ffff8800869ebae0 ffffffff818211f5 0000000000000000
[ 1800.385588] Call Trace:
[ 1800.385590]  [<ffffffff818219f0>] ? bit_wait+0x60/0x60
[ 1800.385591]  [<ffffffff818211f5>] schedule+0x35/0x80
[ 1800.385593]  [<ffffffff81824315>] schedule_timeout+0x1b5/0x270
[ 1800.385607]  [<ffffffffc019786e>] ? merge_state.part.34+0x12e/0x140 [btrfs]
[ 1800.385621]  [<ffffffffc01975cf>] ? free_extent_state+0x3f/0xa0 [btrfs]
[ 1800.385625]  [<ffffffff8106426e>] ? kvm_clock_get_cycles+0x1e/0x20
[ 1800.385628]  [<ffffffff810f574c>] ? ktime_get+0x3c/0xb0
[ 1800.385630]  [<ffffffff818219f0>] ? bit_wait+0x60/0x60
[ 1800.385631]  [<ffffffff81820744>] io_schedule_timeout+0xa4/0x110
[ 1800.385633]  [<ffffffff81821a0b>] bit_wait_io+0x1b/0x70
[ 1800.385635]  [<ffffffff8182159d>] __wait_on_bit+0x5d/0x90
[ 1800.385638]  [<ffffffff8118cadb>] wait_on_page_bit+0xcb/0xf0
[ 1800.385642]  [<ffffffff810c3ab0>] ? autoremove_wake_function+0x40/0x40
[ 1800.385655]  [<ffffffffc018c54d>] prepare_pages+0x17d/0x190 [btrfs]
[ 1800.385669]  [<ffffffffc018d11c>] __btrfs_buffered_write+0x20c/0x5f0 [btrfs]
[ 1800.385683]  [<ffffffffc01909e1>] btrfs_file_write_iter+0x171/0x560 [btrfs]
[ 1800.385685]  [<ffffffff811eb207>] ? kmem_cache_alloc+0x187/0x1f0
[ 1800.385687]  [<ffffffff8121c006>] ? getname_flags+0x56/0x1f0
[ 1800.385688]  [<ffffffff8120c04b>] new_sync_write+0x9b/0xe0
[ 1800.385690]  [<ffffffff8120c0b6>] __vfs_write+0x26/0x40
[ 1800.385692]  [<ffffffff8120ca39>] vfs_write+0xa9/0x1a0
[ 1800.385693]  [<ffffffff8120d6f5>] SyS_write+0x55/0xc0
[ 1800.385695]  [<ffffffff818252f2>] entry_SYSCALL_64_fastpath+0x16/0x71
[ 1800.385697] INFO: task smbd:1983 blocked for more than 120 seconds.
[ 1800.385699]       Not tainted 4.4.0-22-generic #39-Ubuntu
[ 1800.385700] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1800.385700] smbd            D ffff88012b0b3d08     0  1983   1275 0x00000000
[ 1800.385716]  ffff88012b0b3d08 ffffffff8122d1e4 ffffffff81e11500 ffff88013a403200
[ 1800.385722]  ffff88012b0b4000 ffff8800b92fd1fc ffff88013a403200 00000000ffffffff
[ 1800.385724]  ffff8800b92fd200 ffff88012b0b3d20 ffffffff818211f5 ffff8800b92fd1f8
[ 1800.385726] Call Trace:
[ 1800.385727]  [<ffffffff8122d1e4>] ? mntput+0x24/0x40
[ 1800.385729]  [<ffffffff818211f5>] schedule+0x35/0x80
[ 1800.385730]  [<ffffffff8182149e>] schedule_preempt_disabled+0xe/0x10
[ 1800.385732]  [<ffffffff818230d9>] __mutex_lock_slowpath+0xb9/0x130
[ 1800.385734]  [<ffffffff8182316f>] mutex_lock+0x1f/0x30
[ 1800.385748]  [<ffffffffc01908d1>] btrfs_file_write_iter+0x61/0x560 [btrfs]
[ 1800.385750]  [<ffffffff811eb207>] ? kmem_cache_alloc+0x187/0x1f0
[ 1800.385751]  [<ffffffff8121c006>] ? getname_flags+0x56/0x1f0
[ 1800.385753]  [<ffffffff812115fe>] ? inode_get_bytes+0x1e/0x50
[ 1800.385755]  [<ffffffff8120c04b>] new_sync_write+0x9b/0xe0
[ 1800.385757]  [<ffffffff8120c0b6>] __vfs_write+0x26/0x40
[ 1800.385758]  [<ffffffff8120ca39>] vfs_write+0xa9/0x1a0
[ 1800.385760]  [<ffffffff8120d6f5>] SyS_write+0x55/0xc0
[ 1800.385762]  [<ffffffff818252f2>] entry_SYSCALL_64_fastpath+0x16/0x71
[ 1800.385765] INFO: task smbd:1985 blocked for more than 120 seconds.
[ 1800.385766]       Not tainted 4.4.0-22-generic #39-Ubuntu
[ 1800.385767] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1800.385768] smbd            D ffff880057c87d08     0  1985   1275 0x00000000
[ 1800.385770]  ffff880057c87d08 ffffffff8122d1e4 ffffffff81e11500 ffff880139738c80
[ 1800.385772]  ffff880057c88000 ffff8800b92fd1fc ffff880139738c80 00000000ffffffff
[ 1800.385774]  ffff8800b92fd200 ffff880057c87d20 ffffffff818211f5 ffff8800b92fd1f8
[ 1800.385776] Call Trace:
[ 1800.385778]  [<ffffffff8122d1e4>] ? mntput+0x24/0x40
[ 1800.385779]  [<ffffffff818211f5>] schedule+0x35/0x80
[ 1800.385781]  [<ffffffff8182149e>] schedule_preempt_disabled+0xe/0x10
[ 1800.385783]  [<ffffffff818230d9>] __mutex_lock_slowpath+0xb9/0x130
[ 1800.385784]  [<ffffffff8182316f>] mutex_lock+0x1f/0x30
[ 1800.385798]  [<ffffffffc01908d1>] btrfs_file_write_iter+0x61/0x560 [btrfs]
[ 1800.385800]  [<ffffffff811eb207>] ? kmem_cache_alloc+0x187/0x1f0
[ 1800.385802]  [<ffffffff8121c006>] ? getname_flags+0x56/0x1f0
[ 1800.385803]  [<ffffffff812115fe>] ? inode_get_bytes+0x1e/0x50
[ 1800.385805]  [<ffffffff8120c04b>] new_sync_write+0x9b/0xe0
[ 1800.385807]  [<ffffffff8120c0b6>] __vfs_write+0x26/0x40
[ 1800.385808]  [<ffffffff8120ca39>] vfs_write+0xa9/0x1a0
[ 1800.385810]  [<ffffffff8120d6f5>] SyS_write+0x55/0xc0
[ 1800.385812]  [<ffffffff818252f2>] entry_SYSCALL_64_fastpath+0x16/0x71

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


** Tags: kernel-bug samba xenial

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https://bugs.launchpad.net/bugs/1579803

Title:
  Kernel 4.4.0-22 crash with samba 4.3.9

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