INFO: task syz-executor.0:10790 blocked for more than 143 seconds.
      Not tainted 5.9.0-rc3-next-20200903-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:29800 pid:10790 ppid:  6886 flags:0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3777 [inline]
 __schedule+0xea9/0x2230 kernel/sched/core.c:4526
 schedule+0xd0/0x2a0 kernel/sched/core.c:4601
 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x163/0x260 kernel/sched/completion.c:138
 io_sq_thread_stop fs/io_uring.c:6906 [inline]
 io_finish_async fs/io_uring.c:6920 [inline]
 io_sq_offload_create fs/io_uring.c:7595 [inline]
 io_uring_create fs/io_uring.c:8671 [inline]
 io_uring_setup+0x1495/0x29a0 fs/io_uring.c:8744
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5b9
Code: Bad RIP value.
RSP: 002b:00007f7337505c78 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9
RAX: ffffffffffffffda RBX: 0000000000008540 RCX: 000000000045d5b9
RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 000000000000029e
RBP: 000000000118cf78 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007fff4b9dbe4f R14: 00007f73375069c0 R15: 000000000118cf4c
INFO: task io_uring-sq:10792 blocked for more than 143 seconds.
      Not tainted 5.9.0-rc3-next-20200903-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:io_uring-sq     state:D stack:31120 pid:10792 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3777 [inline]
 __schedule+0xea9/0x2230 kernel/sched/core.c:4526
 schedule+0xd0/0x2a0 kernel/sched/core.c:4601
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4660
 kthread+0x2ac/0x4a0 kernel/kthread.c:285
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Showing all locks held in the system:
1 lock held by khungtaskd/1174:
 #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5829
2 locks held by in:imklog/6551:
 #0: ffff8880a7d0db70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930
 #1: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: rq_lock kernel/sched/sched.h:1292 [inline]
 #1: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: ttwu_queue kernel/sched/core.c:2698 [inline]
 #1: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: try_to_wake_up+0x52b/0x12b0 kernel/sched/core.c:2978

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

NMI backtrace for cpu 1
CPU: 1 PID: 1174 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x198/0x1fd lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x223 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:339
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.9.0-rc3-next-20200903-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events nsim_dev_trap_report_work
RIP: 0010:lock_acquire+0x7/0xae0 kernel/locking/lockdep.c:4977
Code: 24 08 e9 00 fb ff ff 48 c7 c7 f8 e9 bc 8a e8 d0 dd 5a 00 e9 3e fc ff ff 90 66 2e 0f 1f 84 00 00 00 00 00 41 57 41 56 41 89 d6 <41> 55 41 89 f5 41 54 41 89 cc 55 48 89 fd 53 44 89 c3 48 81 ec b8
RSP: 0018:ffffc90000d2fb40 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff89c67500
RBP: ffffc90000d2fbb8 R08: 0000000000000000 R09: 0000000000000000
R10: ffffed1013e77508 R11: 00000000410c905c R12: ffff88808ed72bc0
R13: ffff88809f3ba810 R14: 0000000000000000 R15: ffffffff88cbf600
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7828999000 CR3: 00000000a1b4d000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 rcu_lock_acquire include/linux/rcupdate.h:248 [inline]
 rcu_read_lock include/linux/rcupdate.h:641 [inline]
 net_dm_hw_report+0x39/0x1e0 net/core/drop_monitor.c:989
 devlink_trap_report+0x39e/0x550 net/core/devlink.c:9190
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:571 [inline]
 nsim_dev_trap_report_work+0x879/0xbe0 drivers/net/netdevsim/dev.c:599
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294