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Go Back   Linux Archive > Debian > Debian Kernel

 
 
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Old 08-02-2012, 09:02 AM
Stefan Bühler
 
Default Bug#683619: NBD lockup with segfaulting qemu-nbd

Package: linux-image-3.2.0-3-amd64
Version: 3.2.21-3

Hi,

i tried to get https://github.com/asb/spindle running,
but in ./wheezy-stage0 mkfs hangs forever.

kill -9 doesn't work on mkfs and qemu-nbd, and i can't attach with
strace (at least i can kill strace).

I guess qemu-nbd shouldn't segfault in the first place,
but the kernel should handle this better.

qemu-nbd -d (disconnect) doesn't work (and can't be killed either).

USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 5206 0.0 0.0 129644 2384 ? Dsl 10:29 0:00 qemu-nbd --nocache -c /dev/nbd0 /.../spindle/work/wheezy_apt_cache.qed
root 9504 0.0 0.1 96460 6524 pts/4 D+ 10:35 0:00 qemu-nbd -d /dev/nbd0


[ 4353.088802] nbd0: unknown partition table
[ 4358.345650] qemu-nbd[5206]: segfault at 0 ip 00007fd160ea20b8 sp 00007fd160e32cc0 error 4 in qemu-nbd[7fd160e55000+6d000]
[ 4358.345694] nbd (pid 5209: qemu-nbd) got signal 9
[ 4560.732316] INFO: task qemu-nbd:5206 blocked for more than 120 seconds.
[ 4560.732321] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 4560.732324] qemu-nbd D ffff88009c63f8d0 0 5206 1 0x00000000
[ 4560.732330] ffff88009c63f8d0 0000000000000082 ffff88009c63f918 ffff88011aee87b0
[ 4560.732336] 0000000000013740 ffff8800b6df9fd8 ffff8800b6df9fd8 ffff88009c63f8d0
[ 4560.732341] ffff88011fd137b0 ffff88011fd13740 ffff8801164fc830 7fffffffffffffff
[ 4560.732347] Call Trace:
[ 4560.732356] [<ffffffff81349d2e>] ? schedule_timeout+0x2c/0xdb
[ 4560.732362] [<ffffffff8103f47f>] ? try_to_wake_up+0x187/0x197
[ 4560.732366] [<ffffffff81349974>] ? wait_for_common+0xa0/0x119
[ 4560.732370] [<ffffffff8103f48f>] ? try_to_wake_up+0x197/0x197
[ 4560.732375] [<ffffffff810ff18c>] ? do_coredump+0x2b5/0xab9
[ 4560.732380] [<ffffffff8107072d>] ? arch_local_irq_save+0x11/0x17
[ 4560.732384] [<ffffffff8134abd4>] ? _raw_spin_lock_irqsave+0x9/0x25
[ 4560.732388] [<ffffffff8103f47f>] ? try_to_wake_up+0x187/0x197
[ 4560.732393] [<ffffffff81053d3b>] ? __dequeue_signal+0xca/0xf4
[ 4560.732397] [<ffffffff81053bd8>] ? recalc_sigpending+0x23/0x3c
[ 4560.732402] [<ffffffff81055baf>] ? get_signal_to_deliver+0x464/0x48f
[ 4560.732407] [<ffffffff81343a19>] ? force_sig_info_fault+0x5b/0x63
[ 4560.732413] [<ffffffff8100de33>] ? do_signal+0x38/0x610
[ 4560.732417] [<ffffffff8103f48f>] ? try_to_wake_up+0x197/0x197
[ 4560.732422] [<ffffffff810fa727>] ? fget_light+0x5f/0x73
[ 4560.732427] [<ffffffff8100e441>] ? do_notify_resume+0x25/0x68
[ 4560.732431] [<ffffffff8134afbc>] ? retint_signal+0x48/0x8c
[ 4560.732435] INFO: task qemu-nbd:5207 blocked for more than 120 seconds.
[ 4560.732438] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 4560.732441] qemu-nbd D ffff88011aee87b0 0 5207 1 0x00000000
[ 4560.732445] ffff88011aee87b0 0000000000000082 0000000000000000 ffff8801164fc140
[ 4560.732451] 0000000000013740 ffff8800d81fdfd8 ffff8800d81fdfd8 ffff88011aee87b0
[ 4560.732456] ffff88011aee87b0 ffff8800d825f080 ffff88011aee87b0 ffff88011aee87b0
[ 4560.732461] Call Trace:
[ 4560.732466] [<ffffffff8104986f>] ? exit_mm+0x97/0x122
[ 4560.732471] [<ffffffff81049b40>] ? do_exit+0x246/0x6fc
[ 4560.732475] [<ffffffff8104a276>] ? do_group_exit+0x74/0x9e
[ 4560.732479] [<ffffffff81055bb8>] ? get_signal_to_deliver+0x46d/0x48f
[ 4560.732484] [<ffffffff8100de33>] ? do_signal+0x38/0x610
[ 4560.732489] [<ffffffff81037ec0>] ? set_next_entity+0x32/0x55
[ 4560.732493] [<ffffffff8100d025>] ? paravirt_write_msr+0xb/0xe
[ 4560.732497] [<ffffffff8100d6f1>] ? __switch_to+0x181/0x258
[ 4560.732503] [<ffffffff8106f2f9>] ? sys_futex+0x138/0x147
[ 4560.732507] [<ffffffff8100e441>] ? do_notify_resume+0x25/0x68
[ 4560.732512] [<ffffffff8134fe60>] ? int_signal+0x12/0x17
[ 4560.732515] INFO: task qemu-nbd:5208 blocked for more than 120 seconds.
[ 4560.732518] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 4560.732521] qemu-nbd D ffff8801164fc140 0 5208 1 0x00000000
[ 4560.732526] ffff8801164fc140 0000000000000082 0000000000000000 ffff8801164fc830
[ 4560.732531] 0000000000013740 ffff8800d4235fd8 ffff8800d4235fd8 ffff8801164fc140
[ 4560.732536] ffff8801164fc140 ffff8800d825f080 ffff8801164fc140 ffff8801164fc140
[ 4560.732542] Call Trace:
[ 4560.732546] [<ffffffff8104986f>] ? exit_mm+0x97/0x122
[ 4560.732550] [<ffffffff81049b40>] ? do_exit+0x246/0x6fc
[ 4560.732555] [<ffffffff8104a276>] ? do_group_exit+0x74/0x9e
[ 4560.732559] [<ffffffff81055bb8>] ? get_signal_to_deliver+0x46d/0x48f
[ 4560.732564] [<ffffffff8100de33>] ? do_signal+0x38/0x610
[ 4560.732569] [<ffffffff8106f2f9>] ? sys_futex+0x138/0x147
[ 4560.732573] [<ffffffff8100e441>] ? do_notify_resume+0x25/0x68
[ 4560.732577] [<ffffffff8134fe60>] ? int_signal+0x12/0x17
[ 4560.732581] INFO: task qemu-nbd:5209 blocked for more than 120 seconds.
[ 4560.732583] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 4560.732586] qemu-nbd D ffff88011fd13740 0 5209 1 0x00000000
[ 4560.732591] ffff8801164fc830 0000000000000082 0000000000000000 ffff88011aee80c0
[ 4560.732596] 0000000000013740 ffff88003719bfd8 ffff88003719bfd8 ffff8801164fc830
[ 4560.732601] 0000000000000246 0000000181047641 ffffffff0000000f ffff8800b6ef5078
[ 4560.732607] Call Trace:
[ 4560.732611] [<ffffffff8134a1bf>] ? __mutex_lock_common.isra.5+0xff/0x164
[ 4560.732616] [<ffffffff8134a0ad>] ? mutex_lock+0x1a/0x2d
[ 4560.732621] [<ffffffffa08df150>] ? sock_shutdown+0x16/0x62 [nbd]
[ 4560.732626] [<ffffffffa08df3f5>] ? sock_xmit+0x259/0x2c9 [nbd]
[ 4560.732630] [<ffffffff8103703b>] ? test_tsk_need_resched+0xa/0x13
[ 4560.732636] [<ffffffff8103ad6e>] ? check_preempt_curr+0x52/0x5f
[ 4560.732639] [<ffffffff8103f47f>] ? try_to_wake_up+0x187/0x197
[ 4560.732644] [<ffffffff8105aab7>] ? __queue_work+0x224/0x24c
[ 4560.732649] [<ffffffff81197afc>] ? freed_request+0x2f/0x4d
[ 4560.732654] [<ffffffff81198763>] ? __blk_end_bidi_request+0x1e/0x27
[ 4560.732658] [<ffffffffa08df987>] ? __nbd_ioctl+0x2ec/0x725 [nbd]
[ 4560.732664] [<ffffffff810ba32b>] ? get_page_from_freelist+0x497/0x665
[ 4560.732668] [<ffffffff81036d87>] ? cpumask_next+0x16/0x18
[ 4560.732672] [<ffffffff81040a54>] ? select_task_rq_fair+0x435/0x67e
[ 4560.732676] [<ffffffff8103703b>] ? test_tsk_need_resched+0xa/0x13
[ 4560.732680] [<ffffffff8103a303>] ? resched_task+0x39/0x65
[ 4560.732685] [<ffffffff8103a541>] ? check_preempt_wakeup+0x111/0x17a
[ 4560.732689] [<ffffffff8103703b>] ? test_tsk_need_resched+0xa/0x13
[ 4560.732693] [<ffffffff8103ad6e>] ? check_preempt_curr+0x52/0x5f
[ 4560.732697] [<ffffffff8103adcb>] ? ttwu_do_wakeup+0x50/0xc4
[ 4560.732701] [<ffffffff81036457>] ? should_resched+0x5/0x23
[ 4560.732705] [<ffffffffa08dff04>] ? nbd_ioctl+0x144/0x166 [nbd]
[ 4560.732711] [<ffffffff8105f5fc>] ? autoremove_wake_function+0x9/0x2a
[ 4560.732715] [<ffffffff8119d1bf>] ? blkdev_ioctl+0x5e6/0x5fb
[ 4560.732719] [<ffffffff8107072d>] ? arch_local_irq_save+0x11/0x17
[ 4560.732724] [<ffffffff811204f0>] ? block_ioctl+0x38/0x3c
[ 4560.732728] [<ffffffff811204b8>] ? bd_set_size+0x4a/0x4a
[ 4560.732733] [<ffffffff81106889>] ? do_vfs_ioctl+0x459/0x49a
[ 4560.732737] [<ffffffff81039896>] ? finish_task_switch+0xa2/0xba
[ 4560.732741] [<ffffffff810377cd>] ? put_task_struct+0xd/0x1c
[ 4560.732745] [<ffffffff81349864>] ? __schedule+0x5ac/0x5c3
[ 4560.732750] [<ffffffff81106915>] ? sys_ioctl+0x4b/0x72
[ 4560.732754] [<ffffffff8134fb92>] ? system_call_fastpath+0x16/0x1b
[ 4560.732759] INFO: task mkfs.ext4:5213 blocked for more than 120 seconds.
[ 4560.732761] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 4560.732764] mkfs.ext4 D ffff88011fc13740 0 5213 5212 0x00000004
[ 4560.732769] ffff8801176db120 0000000000000086 0000000000000000 ffffffff8160d020
[ 4560.732774] 0000000000013740 ffff8800d8013fd8 ffff8800d8013fd8 ffff8801176db120
[ 4560.732780] ffff8800d8013ad8 00000001d8013ad8 ffff8800d40d52f0 ffff88011fc13f90
[ 4560.732785] Call Trace:
[ 4560.732789] [<ffffffff81349b14>] ? io_schedule+0x59/0x71
[ 4560.732794] [<ffffffff81197e97>] ? get_request_wait+0x105/0x18f
[ 4560.732798] [<ffffffff8105f5f3>] ? add_wait_queue+0x3c/0x3c
[ 4560.732802] [<ffffffff81198dec>] ? blk_queue_bio+0x17f/0x28b
[ 4560.732807] [<ffffffff81197923>] ? generic_make_request+0x90/0xcf
[ 4560.732811] [<ffffffff81197a35>] ? submit_bio+0xd3/0xf1
[ 4560.732815] [<ffffffff8111fb36>] ? bio_alloc_bioset+0x43/0xb6
[ 4560.732819] [<ffffffff8111bae4>] ? submit_bh+0xe2/0xff
[ 4560.732823] [<ffffffff8111cea3>] ? __block_write_full_page+0x1ee/0x2d5
[ 4560.732828] [<ffffffff8111e6bf>] ? bit_spin_lock.constprop.30+0x22/0x22
[ 4560.732832] [<ffffffff81121197>] ? blkdev_get_blocks+0x83/0x83
[ 4560.732836] [<ffffffff810bb64e>] ? __writepage+0xa/0x21
[ 4560.732840] [<ffffffff810bb4d6>] ? write_cache_pages+0x1f8/0x2e9
[ 4560.732845] [<ffffffff810bb644>] ? set_page_dirty_lock+0x2b/0x2b
[ 4560.732849] [<ffffffff810bb601>] ? generic_writepages+0x3a/0x52
[ 4560.732855] [<ffffffff810b4c98>] ? __filemap_fdatawrite_range+0x4b/0x50
[ 4560.732860] [<ffffffff810b4cc2>] ? filemap_write_and_wait_range+0x25/0x4d
[ 4560.732864] [<ffffffff81120e98>] ? blkdev_fsync+0x13/0x38
[ 4560.732868] [<ffffffff8111aa1b>] ? sys_fsync+0x20/0x31
[ 4560.732872] [<ffffffff8134fb92>] ? system_call_fastpath+0x16/0x1b
[ 4560.732876] INFO: task flush-43:0:5215 blocked for more than 120 seconds.
[ 4560.732878] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 4560.732881] flush-43:0 D ffff88011fd13740 0 5215 2 0x00000000
[ 4560.732886] ffff88009c63f1e0 0000000000000046 0000000000000000 ffff88011aee80c0
[ 4560.732891] 0000000000013740 ffff8800a8669fd8 ffff8800a8669fd8 ffff88009c63f1e0
[ 4560.732897] ffff8800a8669850 00000001a8669850 ffff8800d40d5520 ffff88011fd13f90
[ 4560.732902] Call Trace:
[ 4560.732906] [<ffffffff81349b14>] ? io_schedule+0x59/0x71
[ 4560.732910] [<ffffffff81197e97>] ? get_request_wait+0x105/0x18f
[ 4560.732915] [<ffffffff8105f5f3>] ? add_wait_queue+0x3c/0x3c
[ 4560.732919] [<ffffffff81198dec>] ? blk_queue_bio+0x17f/0x28b
[ 4560.732923] [<ffffffff81197923>] ? generic_make_request+0x90/0xcf
[ 4560.732928] [<ffffffff81197a35>] ? submit_bio+0xd3/0xf1
[ 4560.732932] [<ffffffff8111fb36>] ? bio_alloc_bioset+0x43/0xb6
[ 4560.732936] [<ffffffff8111bae4>] ? submit_bh+0xe2/0xff
[ 4560.732940] [<ffffffff8111cea3>] ? __block_write_full_page+0x1ee/0x2d5
[ 4560.732944] [<ffffffff8111e6bf>] ? bit_spin_lock.constprop.30+0x22/0x22
[ 4560.732949] [<ffffffff81121197>] ? blkdev_get_blocks+0x83/0x83
[ 4560.732953] [<ffffffff810bb64e>] ? __writepage+0xa/0x21
[ 4560.732957] [<ffffffff810bb4d6>] ? write_cache_pages+0x1f8/0x2e9
[ 4560.732961] [<ffffffff810bb644>] ? set_page_dirty_lock+0x2b/0x2b
[ 4560.732966] [<ffffffff810bb601>] ? generic_writepages+0x3a/0x52
[ 4560.732971] [<ffffffff81117152>] ? writeback_single_inode+0x124/0x2d3
[ 4560.732976] [<ffffffff811175d2>] ? writeback_sb_inodes+0x16b/0x204
[ 4560.732980] [<ffffffff811176d8>] ? __writeback_inodes_wb+0x6d/0xab
[ 4560.732985] [<ffffffff8111783e>] ? wb_writeback+0x128/0x21f
[ 4560.732989] [<ffffffff81117d44>] ? wb_do_writeback+0x189/0x1a8
[ 4560.732994] [<ffffffff81117de7>] ? bdi_writeback_thread+0x84/0x1e5
[ 4560.732998] [<ffffffff81117d63>] ? wb_do_writeback+0x1a8/0x1a8
[ 4560.733002] [<ffffffff8105efad>] ? kthread+0x76/0x7e
[ 4560.733008] [<ffffffff81351cf4>] ? kernel_thread_helper+0x4/0x10
[ 4560.733012] [<ffffffff8105ef37>] ? kthread_worker_fn+0x139/0x139
[ 4560.733017] [<ffffffff81351cf0>] ? gs_change+0x13/0x13
[ 4680.732105] INFO: task qemu-nbd:5206 blocked for more than 120 seconds.
[ 4680.732109] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 4680.732112] qemu-nbd D ffff88009c63f8d0 0 5206 1 0x00000000
[ 4680.732117] ffff88009c63f8d0 0000000000000082 ffff88009c63f918 ffff88011aee87b0
[ 4680.732122] 0000000000013740 ffff8800b6df9fd8 ffff8800b6df9fd8 ffff88009c63f8d0
[ 4680.732126] ffff88011fd137b0 ffff88011fd13740 ffff8801164fc830 7fffffffffffffff
[ 4680.732130] Call Trace:
[ 4680.732138] [<ffffffff81349d2e>] ? schedule_timeout+0x2c/0xdb
[ 4680.732143] [<ffffffff8103f47f>] ? try_to_wake_up+0x187/0x197
[ 4680.732146] [<ffffffff81349974>] ? wait_for_common+0xa0/0x119
[ 4680.732149] [<ffffffff8103f48f>] ? try_to_wake_up+0x197/0x197
[ 4680.732153] [<ffffffff810ff18c>] ? do_coredump+0x2b5/0xab9
[ 4680.732157] [<ffffffff8107072d>] ? arch_local_irq_save+0x11/0x17
[ 4680.732161] [<ffffffff8134abd4>] ? _raw_spin_lock_irqsave+0x9/0x25
[ 4680.732163] [<ffffffff8103f47f>] ? try_to_wake_up+0x187/0x197
[ 4680.732167] [<ffffffff81053d3b>] ? __dequeue_signal+0xca/0xf4
[ 4680.732170] [<ffffffff81053bd8>] ? recalc_sigpending+0x23/0x3c
[ 4680.732174] [<ffffffff81055baf>] ? get_signal_to_deliver+0x464/0x48f
[ 4680.732178] [<ffffffff81343a19>] ? force_sig_info_fault+0x5b/0x63
[ 4680.732183] [<ffffffff8100de33>] ? do_signal+0x38/0x610
[ 4680.732186] [<ffffffff8103f48f>] ? try_to_wake_up+0x197/0x197
[ 4680.732191] [<ffffffff810fa727>] ? fget_light+0x5f/0x73
[ 4680.732194] [<ffffffff8100e441>] ? do_notify_resume+0x25/0x68
[ 4680.732197] [<ffffffff8134afbc>] ? retint_signal+0x48/0x8c
[ 4680.732200] INFO: task qemu-nbd:5207 blocked for more than 120 seconds.
[ 4680.732203] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 4680.732205] qemu-nbd D ffff88011aee87b0 0 5207 1 0x00000000
[ 4680.732208] ffff88011aee87b0 0000000000000082 0000000000000000 ffff8801164fc140
[ 4680.732212] 0000000000013740 ffff8800d81fdfd8 ffff8800d81fdfd8 ffff88011aee87b0
[ 4680.732216] ffff88011aee87b0 ffff8800d825f080 ffff88011aee87b0 ffff88011aee87b0
[ 4680.732220] Call Trace:
[ 4680.732224] [<ffffffff8104986f>] ? exit_mm+0x97/0x122
[ 4680.732228] [<ffffffff81049b40>] ? do_exit+0x246/0x6fc
[ 4680.732231] [<ffffffff8104a276>] ? do_group_exit+0x74/0x9e
[ 4680.732235] [<ffffffff81055bb8>] ? get_signal_to_deliver+0x46d/0x48f
[ 4680.732238] [<ffffffff8100de33>] ? do_signal+0x38/0x610
[ 4680.732242] [<ffffffff81037ec0>] ? set_next_entity+0x32/0x55
[ 4680.732246] [<ffffffff8100d025>] ? paravirt_write_msr+0xb/0xe
[ 4680.732249] [<ffffffff8100d6f1>] ? __switch_to+0x181/0x258
[ 4680.732253] [<ffffffff8106f2f9>] ? sys_futex+0x138/0x147
[ 4680.732257] [<ffffffff8100e441>] ? do_notify_resume+0x25/0x68
[ 4680.732261] [<ffffffff8134fe60>] ? int_signal+0x12/0x17
[ 4680.732264] INFO: task qemu-nbd:5208 blocked for more than 120 seconds.
[ 4680.732266] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 4680.732268] qemu-nbd D ffff8801164fc140 0 5208 1 0x00000000
[ 4680.732272] ffff8801164fc140 0000000000000082 0000000000000000 ffff8801164fc830
[ 4680.732276] 0000000000013740 ffff8800d4235fd8 ffff8800d4235fd8 ffff8801164fc140
[ 4680.732280] ffff8801164fc140 ffff8800d825f080 ffff8801164fc140 ffff8801164fc140
[ 4680.732284] Call Trace:
[ 4680.732287] [<ffffffff8104986f>] ? exit_mm+0x97/0x122
[ 4680.732291] [<ffffffff81049b40>] ? do_exit+0x246/0x6fc
[ 4680.732294] [<ffffffff8104a276>] ? do_group_exit+0x74/0x9e
[ 4680.732297] [<ffffffff81055bb8>] ? get_signal_to_deliver+0x46d/0x48f
[ 4680.732301] [<ffffffff8100de33>] ? do_signal+0x38/0x610
[ 4680.732305] [<ffffffff8106f2f9>] ? sys_futex+0x138/0x147
[ 4680.732308] [<ffffffff8100e441>] ? do_notify_resume+0x25/0x68
[ 4680.732311] [<ffffffff8134fe60>] ? int_signal+0x12/0x17
[ 4680.732314] INFO: task qemu-nbd:5209 blocked for more than 120 seconds.
[ 4680.732316] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 4680.732318] qemu-nbd D ffff88011fd13740 0 5209 1 0x00000000
[ 4680.732322] ffff8801164fc830 0000000000000082 0000000000000000 ffff88011aee80c0
[ 4680.732326] 0000000000013740 ffff88003719bfd8 ffff88003719bfd8 ffff8801164fc830
[ 4680.732330] 0000000000000246 0000000181047641 ffffffff0000000f ffff8800b6ef5078
[ 4680.732334] Call Trace:
[ 4680.732338] [<ffffffff8134a1bf>] ? __mutex_lock_common.isra.5+0xff/0x164
[ 4680.732341] [<ffffffff8134a0ad>] ? mutex_lock+0x1a/0x2d
[ 4680.732346] [<ffffffffa08df150>] ? sock_shutdown+0x16/0x62 [nbd]
[ 4680.732350] [<ffffffffa08df3f5>] ? sock_xmit+0x259/0x2c9 [nbd]
[ 4680.732353] [<ffffffff8103703b>] ? test_tsk_need_resched+0xa/0x13
[ 4680.732357] [<ffffffff8103ad6e>] ? check_preempt_curr+0x52/0x5f
[ 4680.732360] [<ffffffff8103f47f>] ? try_to_wake_up+0x187/0x197
[ 4680.732364] [<ffffffff8105aab7>] ? __queue_work+0x224/0x24c
[ 4680.732368] [<ffffffff81197afc>] ? freed_request+0x2f/0x4d
[ 4680.732371] [<ffffffff81198763>] ? __blk_end_bidi_request+0x1e/0x27
[ 4680.732375] [<ffffffffa08df987>] ? __nbd_ioctl+0x2ec/0x725 [nbd]
[ 4680.732379] [<ffffffff810ba32b>] ? get_page_from_freelist+0x497/0x665
[ 4680.732383] [<ffffffff81036d87>] ? cpumask_next+0x16/0x18
[ 4680.732386] [<ffffffff81040a54>] ? select_task_rq_fair+0x435/0x67e
[ 4680.732389] [<ffffffff8103703b>] ? test_tsk_need_resched+0xa/0x13
[ 4680.732392] [<ffffffff8103a303>] ? resched_task+0x39/0x65
[ 4680.732395] [<ffffffff8103a541>] ? check_preempt_wakeup+0x111/0x17a
[ 4680.732398] [<ffffffff8103703b>] ? test_tsk_need_resched+0xa/0x13
[ 4680.732402] [<ffffffff8103ad6e>] ? check_preempt_curr+0x52/0x5f
[ 4680.732405] [<ffffffff8103adcb>] ? ttwu_do_wakeup+0x50/0xc4
[ 4680.732408] [<ffffffff81036457>] ? should_resched+0x5/0x23
[ 4680.732411] [<ffffffffa08dff04>] ? nbd_ioctl+0x144/0x166 [nbd]
[ 4680.732415] [<ffffffff8105f5fc>] ? autoremove_wake_function+0x9/0x2a
[ 4680.732419] [<ffffffff8119d1bf>] ? blkdev_ioctl+0x5e6/0x5fb
[ 4680.732422] [<ffffffff8107072d>] ? arch_local_irq_save+0x11/0x17
[ 4680.732426] [<ffffffff811204f0>] ? block_ioctl+0x38/0x3c
[ 4680.732429] [<ffffffff811204b8>] ? bd_set_size+0x4a/0x4a
[ 4680.732433] [<ffffffff81106889>] ? do_vfs_ioctl+0x459/0x49a
[ 4680.732436] [<ffffffff81039896>] ? finish_task_switch+0xa2/0xba
[ 4680.732439] [<ffffffff810377cd>] ? put_task_struct+0xd/0x1c
[ 4680.732443] [<ffffffff81349864>] ? __schedule+0x5ac/0x5c3
[ 4680.732446] [<ffffffff81106915>] ? sys_ioctl+0x4b/0x72
[ 4680.732449] [<ffffffff8134fb92>] ? system_call_fastpath+0x16/0x1b


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