Excellent. I will do this the next time I see this happen. It probably
won't be long.
On Feb 24, 2012 12:45 AM, "Stefan Hajnoczi" <email address hidden>
wrote:

> On Thu, Feb 23, 2012 at 9:39 PM, Avleen Vig <email address hidden>
> wrote:
> > Nothing else at all accesses those files, which is one of the things
> that concerned me the most :-/
> > It looks like it call came from the same place.
>
> It's possible to check the file descriptor flags using
> /proc/$PID/fdinfo/$FD.  So for example, you could find the qemu-kvm
> process and list its open file descriptors using ls -l /proc/$(pgrep
> qemu-kvm)/fd.  Find the file descriptor to the image file and look up
> its flags in /proc/$PID/fdinfo/$FD.
>
> If the file descriptor has bit 040000 set then it is O_DIRECT.  If
> not, it uses buffered I/O.
>
> Using this technique you could determine whether or not your system is
> accessing the file using both direct and buffered I/O.  It would also
> tell you which processes are doing this.
>
> Stefan
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/939027
>
> Title:
>  Combining direct_io and non-direct_io leads to hang
>
> Status in QEMU:
>  New
>
> Bug description:
>  Version 0.12.2 - I know this isn't the latest but I looked through the
>  changelogs and couldn't find any references to this being fixed.
>
>  This is related to issues that many apps have, and is described in more
> detail here:
>      http://oss.sgi.com/archives/xfs/2010-07/msg00163.html
>  and:
>      https://bugs.launchpad.net/percona-xtrabackup/+bug/606981
>
>  When using both direct io and buffered io on the same file, you can cause
> corruption on the filesystem and other issues.
>  XFS out right hangs, but the problem exists on ext3 and other filesystems
> which silently carry on.
>
>  **this is a data corruption issue**.
>
>  This is the full stack trace we got from a recent hang:
>
>  Feb 22 19:55:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 19:55:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 19:55:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 19:55:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 19:55:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 19:55:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 19:55:14 virt11 kernel: Call Trace:
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 19:57:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 19:57:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 19:57:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 19:57:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 19:57:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 19:57:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 19:57:14 virt11 kernel: Call Trace:
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 19:59:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 19:59:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 19:59:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 19:59:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 19:59:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 19:59:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 19:59:14 virt11 kernel: Call Trace:
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 20:01:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 20:01:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 20:01:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 20:01:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 20:01:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 20:01:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 20:01:14 virt11 kernel: Call Trace:
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 20:03:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 20:03:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 20:03:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 20:03:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 20:03:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 20:03:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 20:03:14 virt11 kernel: Call Trace:
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 20:05:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 20:05:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 20:05:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 20:05:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 20:05:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 20:05:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 20:05:14 virt11 kernel: Call Trace:
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 20:07:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 20:07:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 20:07:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 20:07:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 20:07:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 20:07:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 20:07:14 virt11 kernel: Call Trace:
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 20:09:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 20:09:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 20:09:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 20:09:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 20:09:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 20:09:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 20:09:14 virt11 kernel: Call Trace:
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 20:11:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 20:11:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 20:11:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 20:11:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 20:11:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 20:11:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 20:11:14 virt11 kernel: Call Trace:
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 20:13:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 20:13:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 20:13:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 20:13:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 20:13:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 20:13:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 20:13:14 virt11 kernel: Call Trace:
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>
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> https://bugs.launchpad.net/qemu/+bug/939027/+subscriptions
>