INFO: task kworker/1:71:5934 blocked for more than 143 seconds.
      Not tainted 5.10.0-rc3-next-20201116-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:71    state:D stack:29680 pid: 5934 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4269 [inline]
 __schedule+0x890/0x2030 kernel/sched/core.c:5019
 schedule+0xcf/0x270 kernel/sched/core.c:5098
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5157
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103
 worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
 create_worker+0x461/0x6d0 kernel/workqueue.c:1941
 maybe_create_worker kernel/workqueue.c:2091 [inline]
 manage_workers kernel/workqueue.c:2143 [inline]
 worker_thread+0xaef/0x1120 kernel/workqueue.c:2390
 kthread+0x3af/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
INFO: task kworker/1:72:5935 blocked for more than 143 seconds.
      Not tainted 5.10.0-rc3-next-20201116-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:72    state:D stack:30880 pid: 5935 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4269 [inline]
 __schedule+0x890/0x2030 kernel/sched/core.c:5019
 schedule+0xcf/0x270 kernel/sched/core.c:5098
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5157
 kthread+0x2a6/0x4a0 kernel/kthread.c:285
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Showing all locks held in the system:
1 lock held by rcu_gp/3:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by mm_percpu_wq/9:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
3 locks held by kworker/u4:4/207:
 #0: ffff8881407aa938 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8881407aa938 ((wq_completion)netns){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff8881407aa938 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff8881407aa938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff8881407aa938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff8881407aa938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
 #1: ffffc9000145fda8 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
 #2: ffffffff8c920a90 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xb10 net/core/net_namespace.c:566
1 lock held by kworker/u4:8/410:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by khungtaskd/1658:
 #0: ffffffff8b339ce0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6252
1 lock held by khugepaged/1666:
 #0: ffffffff8b443368 (pcpu_drain_mutex){+.+.}-{3:3}, at: __drain_all_pages+0x4f/0x670 mm/page_alloc.c:3062
1 lock held by dm_bufio_cache/4362:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by ipv6_addrconf/4691:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
2 locks held by systemd-journal/4887:
1 lock held by in:imklog/8191:
1 lock held by wg-crypt-wg0/9273:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg1/9276:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg2/9320:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg0/10512:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg1/10515:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg2/10518:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg0/12166:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg1/12169:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg2/12172:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg0/13391:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg1/13392:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg2/13398:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg0/13401:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg1/13408:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg2/13415:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg0/14379:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg1/14382:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
1 lock held by wg-crypt-wg2/14385:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
2 locks held by kworker/u4:1/17532:
 #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
 #1: ffffc90002f2fda8 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
1 lock held by kworker/0:6/22694:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846
2 locks held by kworker/0:43/22737:
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
 #1: ffffc9001739fda8 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
3 locks held by kworker/0:212/22925:
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
 #1: ffffc9001af1fda8 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
 #2: ffffffff8b342428 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
 #2: ffffffff8b342428 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4f2/0x610 kernel/rcu/tree_exp.h:836
3 locks held by kworker/0:258/22978:
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
 #1: ffffc9001b20fda8 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
 #2: ffffffff8b342428 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
 #2: ffffffff8b342428 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x27e/0x610 kernel/rcu/tree_exp.h:836
2 locks held by kworker/u4:3/31884:
 #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
 #1: ffffc9000186fda8 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
1 lock held by kworker/1:71/5934:
 #0: ffffffff8b204b88 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x290 kernel/workqueue.c:1846

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1658 Comm: khungtaskd Not tainted 5.10.0-rc3-next-20201116-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline]
 watchdog+0xd89/0xf30 kernel/hung_task.c:338
 kthread+0x3af/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8192 Comm: rs:main Q:Reg Not tainted 5.10.0-rc3-next-20201116-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:validate_chain kernel/locking/lockdep.c:3613 [inline]
RIP: 0010:__lock_acquire+0xcd1/0x5c00 kernel/locking/lockdep.c:4830
Code: a6 48 00 00 41 8b 44 24 20 25 00 80 04 00 3d 00 00 04 00 0f 84 dd 09 00 00 48 c7 c2 5c 63 ed 8c 48 b8 00 00 00 00 00 fc ff df <48> c1 ea 03 0f b6 14 02 48 c7 c0 5c 63 ed 8c 83 e0 07 83 c0 03 38
RSP: 0018:ffffc90003f0f460 EFLAGS: 00000087
RAX: dffffc0000000000 RBX: 00000000efe4e552 RCX: 00000000106908ff
RDX: ffffffff8ced635c RSI: 573ad64604c3145b RDI: 000000000a8d94d6
RBP: ffff88801b288000 R08: 0000000000000000 R09: ffffffff8ebbf767
R10: fffffbfff1d77eec R11: 0000000000000000 R12: ffff88801b2889a0
R13: 0000000000000000 R14: 573ad64604c3145b R15: 0000000000000000
FS:  00007f2cc6dad700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4d78be8000 CR3: 000000001bc8e000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_acquire kernel/locking/lockdep.c:5435 [inline]
 lock_acquire+0x2a3/0x8c0 kernel/locking/lockdep.c:5400
 rcu_lock_acquire include/linux/rcupdate.h:253 [inline]
 rcu_read_lock include/linux/rcupdate.h:642 [inline]
 ext4_get_group_desc+0x11c/0x4e0 fs/ext4/balloc.c:284
 __ext4_get_inode_loc+0x1b3/0x1130 fs/ext4/inode.c:4309
 ext4_get_inode_loc+0xf3/0x1b0 fs/ext4/inode.c:4448
 ext4_reserve_inode_write+0xc6/0x230 fs/ext4/inode.c:5731
 __ext4_mark_inode_dirty+0x178/0x8a0 fs/ext4/inode.c:5898
 ext4_dirty_inode+0xf3/0x130 fs/ext4/inode.c:5942
 __mark_inode_dirty+0x888/0x1190 fs/fs-writeback.c:2260
 generic_update_time+0x21c/0x370 fs/inode.c:1764
 update_time fs/inode.c:1777 [inline]
 file_update_time+0x434/0x520 fs/inode.c:1992
 file_modified fs/inode.c:2015 [inline]
 file_modified+0x7d/0xa0 fs/inode.c:2000
 ext4_write_checks fs/ext4/file.c:248 [inline]
 ext4_buffered_write_iter+0xff/0x4d0 fs/ext4/file.c:265
 ext4_file_write_iter+0x422/0x1400 fs/ext4/file.c:664
 call_write_iter include/linux/fs.h:1902 [inline]
 new_sync_write+0x426/0x650 fs/read_write.c:518
 vfs_write+0x791/0xa30 fs/read_write.c:605
 ksys_write+0x12d/0x250 fs/read_write.c:658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f2cc97f11cd
Code: c2 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ae fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 f7 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007f2cc6dac590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f2cbc025440 RCX: 00007f2cc97f11cd
RDX: 00000000000003f6 RSI: 00007f2cbc025440 RDI: 0000000000000006
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f2cbc0251c0
R13: 00007f2cc6dac5b0 R14: 0000559ebec42360 R15: 00000000000003f6