Re: task hung over xfs

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Hey Ben.
thank you for your reply.
here is a -re-edited text.

INFO: task java:3510 blocked for more than 120 seconds.
 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
 java          D 0007fffffffff91e     0  3510   3485 0x00000000
  ffff8803b1101c28 0000000000000086 0000000000101b88 0000000000000000
  0000000000000000 ffff8803b1101d7c 000000002bbaad60 0000000000000000
  0000000000015840 000000000000f9c8 ffff88042bbaad60 ffff88042e4d96b0
 Call Trace:
  [<ffffffffa060bd4a>] ? kmem_zone_alloc+0xaa/0x110 [xfs]
  [<ffffffff815f33f5>] __down_write_nested+0xa5/0x100
  [<ffffffff815f346e>] __down_write+0x1e/0x40
  [<ffffffff815f24ac>] down_write+0x1c/0x40
  [<ffffffffa05e7e2c>] xfs_ilock+0x9c/0xb0 [xfs]
  [<ffffffffa06093d6>] xfs_free_eofblocks+0x256/0x290 [xfs]
  [<ffffffffa0609f1d>] xfs_release+0x14d/0x210 [xfs]
  [<ffffffffa0612303>] xfs_file_release+0x23/0x40 [xfs]
  [<ffffffff8114f1f9>] __fput+0xe9/0x210
  [<ffffffff8114f34b>] fput+0x2b/0x50
  [<ffffffff81124349>] remove_vma+0x49/0xb0
  [<ffffffff81125a7a>] do_munmap+0x36a/0x3d0
  [<ffffffff815f346e>] ? __down_write+0x1e/0x40
  [<ffffffff81125b3c>] sys_munmap+0x5c/0xa0
  [<ffffffff81013302>] system_call_fastpath+0x16/0x1b
 INFO: task java:4154 blocked for more than 120 seconds.
 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
 java          D ffff8801c3903f58     0  4154   3485 0x00000000
  ffff8801c3903e68 0000000000000086 0000000000000000 00007f91f35b4734
  000000000000026c 000000000000541b ffff8801c3903df8 ffffffff8151e0d8
  0000000000015840 000000000000f9c8 ffff8801ce6396b0 ffff8803321996b0
 Call Trace:
  [<ffffffff8151e0d8>] ? tcp_ioctl+0xb8/0x1d0
  [<ffffffff8157120e>] ? inet6_ioctl+0x3e/0x100
  [<ffffffff814c7c66>] ? sock_ioctl+0x86/0x2b0
  [<ffffffff815f353d>] __down_read+0xad/0xfa
  [<ffffffff815f24ec>] down_read+0x1c/0x40
  [<ffffffff815f6e59>] do_page_fault+0x379/0x3a0
  [<ffffffff815f4145>] page_fault+0x25/0x30
INFO: task java:4155 blocked for more than 120 seconds.
 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
 java          D ffff880101fe9a58     0  4155   3485 0x00000000
  ffff880101fe9968 0000000000000086 ffff88002804a8b0 0000000000000000
  67e6cb7d743f1c20 ffff8801ce63ad60 ffffffff81852600 0000000000000000
  0000000000015840 000000000000f9c8 ffff8801ce63ad60 ffffffff81852600
 Call Trace:
  [<ffffffff815f353d>] __down_read+0xad/0xfa
  [<ffffffff815f24ec>] down_read+0x1c/0x40
  [<ffffffff815f6e59>] do_page_fault+0x379/0x3a0
  [<ffffffff8109081a>] ? hrtimer_cancel+0x2a/0x60
  [<ffffffff815f4145>] page_fault+0x25/0x30
  [<ffffffff812e3f9d>] ? copy_user_generic_string+0x2d/0x40
  [<ffffffff814d54b8>] ? memcpy_toiovec+0x78/0xa0
  [<ffffffff814d607b>] skb_copy_datagram_iovec+0x5b/0x270
  [<ffffffff815215f6>] tcp_recvmsg+0xbf6/0xd60
  [<ffffffff814cb621>] sock_common_recvmsg+0x41/0x70
  [<ffffffff814ca6b7>] sock_recvmsg+0x127/0x170
  [<ffffffff8108c4a0>] ? autoremove_wake_function+0x0/0x60
  [<ffffffff814cc5da>] ? release_sock+0xca/0xf0
  [<ffffffff815f3d77>] ? _spin_unlock_bh+0x27/0x50
  [<ffffffff814cc5da>] ? release_sock+0xca/0xf0
  [<ffffffff8151e0d8>] ? tcp_ioctl+0xb8/0x1d0
  [<ffffffff814cab88>] sys_recvfrom+0xd8/0x160
  [<ffffffff81160675>] ? poll_select_set_timeout+0xa5/0xc0
  [<ffffffff81013d0e>] ? common_interrupt+0xe/0x13
  [<ffffffff81160f36>] ? sys_poll+0x86/0x140
  [<ffffffff81013302>] system_call_fastpath+0x16/0x1b
 INFO: task java:4156 blocked for more than 120 seconds.
 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
 java          D 0000000004000000     0  4156   3485 0x00000000
  ffff88039fd39e78 0000000000000086 00000000000000df 0000000000000000
  ffff88039fd39e58 ffffffff8151e0d8 0000000000000000 ffffffff00000001
  0000000000015840 000000000000f9c8 ffff8801ce63c410 ffffffff81852600
 Call Trace:
  [<ffffffff8151e0d8>] ? tcp_ioctl+0xb8/0x1d0
  [<ffffffff814cabcb>] ? sys_recvfrom+0x11b/0x160
  [<ffffffff815f33f5>] __down_write_nested+0xa5/0x100
  [<ffffffff815f346e>] __down_write+0x1e/0x40
  [<ffffffff81018764>] sys_mmap+0x74/0x160
  [<ffffffff81013302>] system_call_fastpath+0x16/0x1b
 INFO: task java:4157 blocked for more than 120 seconds.
 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
 java          D ffff88042bc6df58     0  4157   3485 0x00000000
  ffff88042bc6de68 0000000000000086 0000000000000000 00007f91f32b13e4
  000000000000012b 000000000000541b ffff88042bc6ddf8 ffffffff8151e0d8
  0000000000015840 000000000000f9c8 ffff8801ce63dac0 ffffffff81852600
 Call Trace:
  [<ffffffff8151e0d8>] ? tcp_ioctl+0xb8/0x1d0
  [<ffffffff8157120e>] ? inet6_ioctl+0x3e/0x100
  [<ffffffff814c7c66>] ? sock_ioctl+0x86/0x2b0
  [<ffffffff815f353d>] __down_read+0xad/0xfa
  [<ffffffff815f24ec>] down_read+0x1c/0x40
  [<ffffffff815f6e59>] do_page_fault+0x379/0x3a0
  [<ffffffff815f4145>] page_fault+0x25/0x30
 INFO: task java:4161 blocked for more than 120 seconds.
 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
 java          D ffff880264965f58     0  4161   3485 0x00000000
  ffff880264965e68 0000000000000086 0000000000000000 00007f91f2ead5b4
  000000000000005f 000000000000541b ffff880264965df8 ffffffff8151e0d8
  0000000000015840 000000000000f9c8 ffff88027f5dc410 ffffffff81852600
 Call Trace:
  [<ffffffff8151e0d8>] ? tcp_ioctl+0xb8/0x1d0
  [<ffffffff8157120e>] ? inet6_ioctl+0x3e/0x100
  [<ffffffff814c7c66>] ? sock_ioctl+0x86/0x2b0
  [<ffffffff815f353d>] __down_read+0xad/0xfa
  [<ffffffff815f24ec>] down_read+0x1c/0x40
  [<ffffffff815f6e59>] do_page_fault+0x379/0x3a0
  [<ffffffff815f4145>] page_fault+0x25/0x30
 INFO: task java:4163 blocked for more than 120 seconds.
 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
 java          D ffff8803b1163f58     0  4163   3485 0x00000000
  ffff8803b1163e68 0000000000000086 0000000000000000 00007f91f2cab5c4
  0000000000000097 000000000000541b ffff8803b1163df8 ffffffff8151e0d8
  0000000000015840 000000000000f9c8 ffff880332198000 ffffffff81852600
 Call Trace:
 Connection failed; server='AF_INET(192.168.194.2:514)',
error='Connection refused (111)', time_reopen='60'


On Fri, Jun 1, 2012 at 10:27 PM, Ben Myers <bpm@xxxxxxx> wrote:
> Raz,
>
> On Wed, May 30, 2012 at 09:44:45PM +0300, Raz wrote:
>> Hello
>> We using 2.6.32 gentoo 64bit.  and we're getting task_hung timeout stack.
>>
>> Our server uses direct IO.  It reads files contents to buffers in
>> memory  and sends them by TCP.  In addition, data is received
>> by TCP and stored in files on disk.
>> Most of the IO is reading data and sending it by TCP sockets.
>>
>> There are 4 threads reading data from disk into memory buffers. One
>> thread per partition.
>> There are about 20 threads reading data from the network and saving it
>> to disk.
>>
>> In addition, there is an operation that is done on every file once it is
>> downloaded.  This operation maps data from file to memory.  It is done
>> in Java. I assume it is mmap.  The mapping is very short.
>>
>> The bellow is the stack. Is this xfs bug  ? root file system is xfs as
>> well the data partition.
>> Was a fix made in this area  ? when was it ?
>
> Could you post that output without the line wrap?  That is very hard to read.
>
> Thanks,
>        Ben
>
>> thank you
>> raz
>>
>>
>> Apr 20 04:11:50 hcs05 [499496.793804] INFO: task java:10439 blocked
>> for more than 120 seconds.
>> Apr 20 04:11:50 hcs05 [499496.793809] "echo 0 >
>> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>> Apr 20 04:11:50 hcs05 [499496.793814] java          D 0000000000000001
>>     0 10439  10408 0x00000000
>> Apr 20 04:11:50 hcs05 [499496.793821]  ffff88042acd5e78
>> 0000000000000086 0000000000000000 0000000000000081
>> Apr 20 04:11:50 hcs05 [499496.793828]  0000000000000001
>> 0000000041365a28 ffff88042acd5ee8 ffffffff810a1b76
>> Apr 20 04:11:50 hcs05 [499496.793835]  0000000000015840
>> 000000000000f9c8 ffff88042c9596b0 ffff88042e4c2d60
>> Apr 20 04:11:50 hcs05 [499496.793841] Call Trace:
>> Apr 20 04:11:50 hcs05 [499496.793852]  [<ffffffff810a1b76>] ?
>> do_futex+0x106/0xb90
>> Apr 20 04:11:50 hcs05 [499496.793861]  [<ffffffff8101aee6>] ? read_tsc+0x16/0x40
>> Apr 20 04:11:50 hcs05 [499496.793866]  [<ffffffff815f33f5>]
>> __down_write_nested+0xa5/0x100
>> Apr 20 04:11:50 hcs05 [499496.793869]  [<ffffffff815f346e>]
>> __down_write+0x1e/0x40
>> Apr 20 04:11:50 hcs05 [499496.793872]  [<ffffffff815f24ac>] down_write+0x1c/0x40
>> Apr 20 04:11:50 hcs05 [499496.793876]  [<ffffffff81127e39>]
>> sys_mprotect+0x109/0x2c0
>> Apr 20 04:11:50 hcs05 [499496.793880]  [<ffffffff81013302>]
>> system_call_fastpath+0x16/0x1b
>> Apr 20 04:11:50 hcs05 [499496.793883] INFO: task java:10449 blocked
>> for more than 120 seconds.
>> Apr 20 04:11:50 hcs05 [499496.793885] "echo 0 >
>> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>> Apr 20 04:11:50 hcs05 [499496.793886] java          D 0007ffffffffe708
>>     0 10449  10408 0x00000000
>> Apr 20 04:11:50 hcs05 [499496.793890]  ffff88042acd1c28
>> 0000000000000086 0000000000cd1b88 0000000000000000
>> Apr 20 04:11:50 hcs05 [499496.793893]  0000000000000000
>> ffff88042acd1d7c 000000002c95c410 0000000000000000
>> Apr 20 04:11:50 hcs05 [499496.793896]  0000000000015840
>> 000000000000f9c8 ffff88042c95c410 ffff88042e4d96b0
>> Apr 20 04:11:50 hcs05 [499496.793899] Call Trace:
>> Apr 20 04:11:50 hcs05 [499496.793922]  [<ffffffffa060bd4a>] ?
>> kmem_zone_alloc+0xaa/0x110 [xfs]
>> Apr 20 04:11:50 hcs05 [499496.793926]  [<ffffffff815f33f5>]
>> __down_write_nested+0xa5/0x100
>> Apr 20 04:11:50 hcs05 [499496.793928]  [<ffffffff815f346e>]
>> __down_write+0x1e/0x40
>> Apr 20 04:11:50 hcs05 [499496.793931]  [<ffffffff815f24ac>] down_write+0x1c/0x40
>> Apr 20 04:11:50 hcs05 [499496.793947]  [<ffffffffa05e7e2c>]
>> xfs_ilock+0x9c/0xb0 [xfs]
>> Apr 20 04:11:50 hcs05 [499496.793962]  [<ffffffffa06093d6>]
>> xfs_free_eofblocks+0x256/0x290 [xfs]
>> Apr 20 04:11:50 hcs05 [499496.793978]  [<ffffffffa0609f1d>]
>> xfs_release+0x14d/0x210 [xfs]
>> Apr 20 04:11:50 hcs05 [499496.793993]  [<ffffffffa0612303>]
>> xfs_file_release+0x23/0x40 [xfs]
>> Apr 20 04:11:50 hcs05 [499496.793996]  [<ffffffff8114f1f9>] __fput+0xe9/0x210
>> Apr 20 04:11:50 hcs05 [499496.793999]  [<ffffffff8114f34b>] fput+0x2b/0x50
>> Apr 20 04:11:50 hcs05 [499496.794002]  [<ffffffff81124349>] remove_vma+0x49/0xb0
>> Apr 20 04:11:50 hcs05 [499496.794004]  [<ffffffff81125a7a>]
>> do_munmap+0x36a/0x3d0
>> Apr 20 04:11:50 hcs05 [499496.794007]  [<ffffffff815f346e>] ?
>> __down_write+0x1e/0x40
>> Apr 20 04:11:50 hcs05 [499496.794010]  [<ffffffff81125b3c>] sys_munmap+0x5c/0xa0
>> Apr 20 04:11:50 hcs05 [499496.794013]  [<ffffffff81013302>]
>> system_call_fastpath+0x16/0x1b
>> Apr 20 04:11:50 hcs05 [499496.794016] INFO: task java:10467 blocked
>> for more than 120 seconds.
>> Apr 20 04:11:50 hcs05 [499496.794017] "echo 0 >
>> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>> Apr 20 04:11:50 hcs05 [499496.794019] java          D ffff88042cd5df58
>>     0 10467  10408 0x00000000
>> Apr 20 04:11:50 hcs05 [499496.794022]  ffff88042cd5de68
>> 0000000000000086 ffff8804249016e0 000000004139b728
>> Apr 20 04:11:50 hcs05 [499496.794026]  0000000000000000
>> 0000000000000081 0000000000000001 000000004139b728
>> Apr 20 04:11:50 hcs05 [499496.794029]  0000000000015840
>> 000000000000f9c8 ffff88042c9fdac0 ffff88042e4d96b0
>> Apr 20 04:11:50 hcs05 [499496.794032] Call Trace:
>> Apr 20 04:11:50 hcs05 [499496.794035]  [<ffffffff815f353d>]
>> __down_read+0xad/0xfa
>> Apr 20 04:11:50 hcs05 [499496.794037]  [<ffffffff815f24ec>] down_read+0x1c/0x40
>> Apr 20 04:11:50 hcs05 [499496.794040]  [<ffffffff815f6e59>]
>> do_page_fault+0x379/0x3a0
>> Apr 20 04:11:50 hcs05 [499496.794043]  [<ffffffff815f4145>] page_fault+0x25/0x30
>> Apr 20 04:11:50 hcs05 [499496.794054] INFO: task java:10949 blocked
>> for more than 120 seconds.
>> Apr 20 04:11:50 hcs05 [499496.794056] "echo 0 >
>> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>> Apr 20 04:11:50 hcs05 [499496.794058] java          D ffff880429dd3f58
>>     0 10949  10408 0x00000000
>> Apr 20 04:11:50 hcs05 [499496.794061]  ffff880429dd3e68
>> 0000000000000086 0000000087237725 0000000000000000
>> Apr 20 04:11:50 hcs05 [499496.794064]  ffff880429dd3df8
>> ffffffff811498ab 0000000100022000 0000000087237725
>> Apr 20 04:11:50 hcs05 [499496.794067]  0000000000015840
>> 000000000000f9c8 ffff880429dd8000 ffffffff81852600
>> Apr 20 04:11:50 hcs05 [499496.794070] Call Trace:
>> Apr 20 04:11:50 hcs05 [499496.794075]  [<ffffffff811498ab>] ?
>> mem_cgroup_charge_common+0x7b/0xb0
>> Apr 20 04:11:50 hcs05 [499496.794078]  [<ffffffff815f353d>]
>> __down_read+0xad/0xfa
>> Apr 20 04:11:50 hcs05 [499496.794081]  [<ffffffff815f24ec>] down_read+0x1c/0x40
>> Apr 20 04:11:50 hcs05 [499496.794083]  [<ffffffff815f6e59>]
>> do_page_fault+0x379/0x3a0
>> Apr 20 04:11:50 hcs05 [499496.794086]  [<ffffffff815f4145>] page_fault+0x25/0x30
>> Apr 20 04:11:50 hcs05 [499496.794089] INFO: task java:10952 blocked
>> for more than 120 seconds.
>> Apr 20 04:11:50 hcs05 [499496.794090] "echo 0 >
>> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>> Apr 20 04:11:50 hcs05 [499496.794092] java          D ffff880429de5f58
>>     0 10952  10408 0x00000000
>> Apr 20 04:11:50 hcs05 [499496.794095]  ffff880429de5e68
>> 0000000000000086 0000000000000000 00007fe2644c33f4
>> Apr 20 04:11:50 hcs05 [499496.794098]  0000000000006f84
>> 000000000000541b ffff880429de5df8 ffffffff8151e0d8
>> Apr 20 04:11:50 hcs05 [499496.794101]  0000000000015840
>> 000000000000f9c8 ffff880429ddc410 ffffffff81852600
>> Apr 20 04:11:50 hcs05 [499496.794104] Call Trace:
>> Apr 20 04:11:50 hcs05 [499496.794108]  [<ffffffff8151e0d8>] ?
>> tcp_ioctl+0xb8/0x1d0
>> Apr 20 04:11:50 hcs05 [499496.794113]  [<ffffffff8157120e>] ?
>> inet6_ioctl+0x3e/0x100
>> Apr 20 04:11:50 hcs05 [499496.794117]  [<ffffffff814c7c66>] ?
>> sock_ioctl+0x86/0x2b0
>> Apr 20 04:11:50 hcs05 [499496.794120]  [<ffffffff815f353d>]
>> __down_read+0xad/0xfa
>> Apr 20 04:11:50 hcs05 [499496.794123]  [<ffffffff815f24ec>] down_read+0x1c/0x40
>> Apr 20 04:11:50 hcs05 [499496.794125]  [<ffffffff815f6e59>]
>> do_page_fault+0x379/0x3a0
>> Apr 20 04:11:50 hcs05 [499496.794128]  [<ffffffff815f4145>] page_fault+0x25/0x30
>> Apr 20 04:11:50 hcs05 [499496.794139] INFO: task java:11768 blocked
>> for more than 120 seconds.
>> Apr 20 04:11:50 hcs05 [499496.794141] "echo 0 >
>> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>> Apr 20 04:11:50 hcs05 [499496.794143] java          D ffff8803bc495b48
>>     0 11768  10408 0x00000000
>> Apr 20 04:11:50 hcs05 [499496.794146]  ffff8803bc495a58
>> 0000000000000086 ffff8803bc4959a8 ffffffff815f38bc
>> Apr 20 04:11:50 hcs05 [499496.794149]  ffff8803bc4959e8
>> 000000005c14da46 ffff8803bc4959d8 ffffffff811300a2
>> Apr 20 04:11:50 hcs05 [499496.794152]  0000000000015840
>> 000000000000f9c8 ffff8803bc468000 ffff88042e4c2d60
>> Apr 20 04:11:50 hcs05 [499496.794155] Call Trace:
>> Apr 20 04:11:50 hcs05 [499496.794157]  [<ffffffff815f38bc>] ?
>> _spin_lock+0x1c/0x40
>> Apr 20 04:11:50 hcs05 [499496.794161]  [<ffffffff811300a2>] ?
>> swap_info_get+0x82/0x120
>> Apr 20 04:11:50 hcs05 [499496.794164]  [<ffffffff811488c1>] ?
>> mem_cgroup_commit_charge_swapin+0x21/0x40
>> Apr 20 04:11:50 hcs05 [499496.794167]  [<ffffffff815f353d>]
>> __down_read+0xad/0xfa
>> Apr 20 04:11:50 hcs05 [499496.794170]  [<ffffffff815f24ec>] down_read+0x1c/0x40
>> Apr 20 04:11:50 hcs05 [499496.794172]  [<ffffffff815f6e59>]
>> do_page_fault+0x379/0x3a0
>> Apr 20 04:11:50 hcs05 [499496.794175]  [<ffffffff815f4145>] page_fault+0x25/0x30
>> Apr 20 04:11:50 hcs05 [499496.794180]  [<ffffffff810fe39c>] ?
>> file_read_actor+0x6c/0x180
>> Apr 20 04:11:50 hcs05 [499496.794183]  [<ffffffff810fe437>] ?
>> file_read_actor+0x107/0x180
>> Apr 20 04:11:50 hcs05 [499496.794187]  [<ffffffff81100d02>]
>> generic_file_aio_read+0x492/0x6b0
>> Apr 20 04:11:50 hcs05 [499496.794202]  [<ffffffffa06178f8>]
>> xfs_read+0x138/0x2c0 [xfs]
>> Apr 20 04:11:50 hcs05 [499496.794218]  [<ffffffffa06124ce>]
>> xfs_file_aio_read+0x6e/0x90 [xfs]
>> Apr 20 04:11:50 hcs05 [499496.794221]  [<ffffffff8114d341>]
>> do_sync_read+0x101/0x160
>> Apr 20 04:11:50 hcs05 [499496.794226]  [<ffffffff8108c4a0>] ?
>> autoremove_wake_function+0x0/0x60
>> Apr 20 04:11:50 hcs05 [499496.794232]  [<ffffffff81276b94>] ?
>> security_file_permission+0x24/0x40
>> Apr 20 04:11:50 hcs05 [499496.794234]  [<ffffffff8114dc64>] vfs_read+0xe4/0x1c0
>> Apr 20 04:11:50 hcs05 [499496.794237]  [<ffffffff8114de5f>] sys_read+0x5f/0xc0
>> Apr 20 04:11:50 hcs05 [499496.794240]  [<ffffffff81013302>]
>> system_call_fastpath+0x16/0x1b
>> Apr 20 04:11:50 hcs05 [499496.794247] INFO: task ps:7313 blocked for
>> more than 120 seconds.
>> Apr 20 04:11:50 hcs05 [499496.794249] "echo 0 >
>> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>> Apr 20 04:11:50 hcs05 [499496.794251] ps            D 0000000000000000
>>     0  7313   7312 0x00000000
>> Apr 20 04:11:50 hcs05 [499496.794254]  ffff88029df4fd18
>> 0000000000000082 ffff88029df4fc78 0000003800000038
>> Apr 20 04:11:50 hcs05 [499496.794257]  0000880200000001
>> 0000000000000001 0000000000011b00 0000000000000001
>> Apr 20 04:11:50 hcs05 [499496.794260]  0000000000015840
>> 000000000000f9c8 ffff8801890d4410 ffff88042e4d96b0
>> Apr 20 04:11:50 hcs05 [499496.794264] Call Trace:
>> Apr 20 04:11:50 hcs05 [499496.794268]  [<ffffffff8116c1de>] ?
>> mntput_no_expire+0x3e/0x140
>> Apr 20 04:11:50 hcs05 [499496.794271]  [<ffffffff815f353d>]
>> __down_read+0xad/0xfa
>> Apr 20 04:11:50 hcs05 [499496.794274]  [<ffffffff815f24ec>] down_read+0x1c/0x40
>> Apr 20 04:11:50 hcs05 [499496.794277]  [<ffffffff8112219b>]
>> access_process_vm+0x5b/0x200
>> Apr 20 04:11:50 hcs05 [499496.794281]  [<ffffffff81068cfd>] ?
>> get_task_mm+0x4d/0xb0
>> Apr 20 04:11:50 hcs05 [499496.794285]  [<ffffffff811b07ba>]
>> proc_pid_cmdline+0xba/0x150
>> Apr 20 04:11:50 hcs05 [499496.794288]  [<ffffffff811b12d2>]
>> proc_info_read+0xc2/0x110
>> Apr 20 04:11:50 hcs05 [499496.794291]  [<ffffffff8114d407>] ?
>> rw_verify_area+0x67/0xf0
>> Apr 20 04:11:50 hcs05 [499496.794293]  [<ffffffff8114dc64>] vfs_read+0xe4/0x1c0
>>
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