[ 2090.430521][   T44] INFO: task ipvtap_test.sh:10250 blocked for more than 122 seconds.
[ 2090.430850][   T44]       Not tainted 7.2.0-rc2-virtme #1
[ 2090.430977][   T44]       Blocked by coredump.
[ 2090.431073][   T44] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 2090.431236][   T44] task:ipvtap_test.sh  state:D stack:25688 pid:10250 tgid:10250 ppid:10191  task_flags:0x40050c flags:0x00080003
[ 2090.431496][   T44] Call Trace:
[ 2090.431576][   T44]  <TASK>
[ 2090.431632][   T44]  __schedule+0xf8c/0x20e0
[ 2090.431747][   T44]  ? io_schedule_timeout+0x140/0x140
[ 2090.431849][   T44]  ? find_held_lock+0x2b/0x80
[ 2090.431955][   T44]  ? lockdep_hardirqs_on+0x8c/0x130
[ 2090.432060][   T44]  schedule+0xe7/0x2f0
[ 2090.432137][   T44]  request_wait_answer+0x4b0/0x760
[ 2090.432240][   T44]  ? fuse_dev_install+0x80/0x80
[ 2090.432348][   T44]  ? finish_wait+0x320/0x320
[ 2090.432465][   T44]  ? virtio_fs_send_req+0xf6/0x480
[ 2090.432571][   T44]  fuse_chan_send+0x35c/0x610
[ 2090.438531][   T44]  ? request_wait_answer+0x4b0/0x760
[ 2090.438765][   T44]  ? fuse_dev_install+0x80/0x80
[ 2090.438873][   T44]  ? finish_wait+0x320/0x320
[ 2090.438985][   T44]  ? virtio_fs_send_req+0xf6/0x480
[ 2090.439091][   T44]  ? fuse_chan_send+0x35c/0x610
[ 2090.439193][   T44]  ? fuse_file_put+0x286/0x470
[ 2090.439295][   T44]  ? fuse_file_release+0x57/0x290
[ 2090.439492][   T44]  ? fuse_release+0x12c/0x230
[ 2090.439601][   T44]  ? __fput+0x363/0xac0
[ 2090.439680][   T44]  ? lockdep_hardirqs_on+0x8c/0x130
[ 2090.439786][   T44]  ? __call_rcu_common.constprop.0+0x3d1/0xa10
[ 2090.439917][   T44]  ? trace_irq_enable.constprop.0+0x9b/0x160
[ 2090.440047][   T44]  ? task_work_run+0x12b/0x240
[ 2090.440205][   T44]  ? __rwlock_init+0x150/0x150
[ 2090.440369][   T44]  ? task_work_cancel+0x30/0x30
[ 2090.440475][   T44]  ? do_raw_spin_unlock+0x59/0x250
[ 2090.448017][   T44]  ? do_task_dead+0xd1/0x110
[ 2090.448147][   T44]  ? _raw_spin_unlock_irqrestore+0x53/0x80
[ 2090.448522][   T44]  ? do_exit+0x8f7/0xdc0
[ 2090.448607][   T44]  ? exit_notify+0x890/0x890
[ 2090.448711][   T44]  ? find_held_lock+0x2b/0x80
[ 2090.448814][   T44]  ? __lock_release.isra.0+0x6b/0x1a0
[ 2090.448916][   T44]  ? __rwlock_init+0x150/0x150
[ 2090.449020][   T44]  ? do_group_exit+0xb8/0x370
[ 2090.449169][   T44]  ? lockdep_hardirqs_on_prepare.part.0+0x9a/0x160
[ 2090.449326][   T44]  ? lockdep_hardirqs_on+0x8c/0x130
[ 2090.449447][   T44]  ? _raw_spin_unlock_irq+0x28/0x50
[ 2090.449719][   T44]  ? _raw_spin_unlock_irq+0x33/0x50
[ 2090.449826][   T44]  ? get_signal+0x1886/0x1980
[ 2090.449938][   T44]  ? __bfs+0x2d6/0x310
[ 2090.450019][   T44]  ? ptrace_signal+0x630/0x630
[ 2090.452958][   T44]  ? arch_do_signal_or_restart+0xc2/0x3a0
[ 2090.453309][   T44]  ? _copy_to_user+0x4b/0x70
[ 2090.453434][   T44]  ? get_sigframe_size+0x20/0x20
[ 2090.453540][   T44]  ? rcu_is_watching+0x15/0xd0
[ 2090.453646][   T44]  ? trace_irq_enable.constprop.0+0x9b/0x160
[ 2090.453781][   T44]  ? exit_to_user_mode_loop+0xd5/0x5a0
[ 2090.453888][   T44]  ? rcu_is_watching+0x15/0xd0
[ 2090.454222][   T44]  ? do_syscall_64+0x437/0x590
[ 2090.454337][   T44]  ? trace_hardirqs_off+0xd/0x30
[ 2090.454450][   T44]  ? exc_page_fault+0xee/0x100
[ 2090.454555][   T44]  ? entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 2090.454691][   T44]  </TASK>
[ 2090.454781][   T44] 
[ 2090.454781][   T44] Showing all locks held in the system:
[ 2090.454939][   T44] 1 lock held by khungtaskd/44:
[ 2090.455040][   T44]  #0: ffffffff9cf91dc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire.constprop.0+0x7/0x30
[ 2090.460188][   T44] 1 lock held by timeout/10192:
[ 2090.460538][   T44]  #0: ffffffff9cfa6d68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x535/0x640
[ 2090.461049][   T44] 1 lock held by timeout/10211:
[ 2090.461162][   T44] 2 locks held by timeout/10222:
[ 2090.461262][   T44] 2 locks held by timeout/10228:
[ 2090.461370][   T44] 2 locks held by timeout/10229:
[ 2090.461484][   T44] 2 locks held by ip/10838:
[ 2090.461675][   T44] 1 lock held by ip/10862:
[ 2090.462241][   T44] 1 lock held by ip/10863:
[ 2090.462477][   T44]  #0: ffffffff9cfa6d68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x319/0x640
[ 2090.462764][   T44] 1 lock held by ip/10866:
[ 2090.462975][   T44] 1 lock held by ip/10867:
[ 2090.463325][   T44] 2 locks held by ipvtap_test.sh/10875:
[ 2090.465080][   T44] 3 locks held by ipvtap_test.sh/10876:
[ 2090.465195][   T44] 1 lock held by ipvtap_test.sh/10877:
[ 2090.465309][   T44] 
[ 2090.465370][   T44] =============================================
[ 2090.465370][   T44] 
[ 2094.892248][T11157] ip (11157) used greatest stack depth: 22880 bytes left