INFO: task syz.5.1165:11924 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.1165      state:D stack:26056 pid:11924 tgid:11923 ppid:11455  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x290
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9842b9acb9
RSP: 002b:00007f9843a0d028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f9842e15fa0 RCX: 00007f9842b9acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f9842e15fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9842e16038 R14: 00007f9842e15fa0 R15: 00007ffd55217868
 </TASK>
INFO: task syz.5.1165:11925 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.1165      state:D stack:28728 pid:11925 tgid:11923 ppid:11455  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x290
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9842b9acb9
RSP: 002b:00007f98439ec028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f9842e16090 RCX: 00007f9842b9acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f9842e16090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9842e16128 R14: 00007f9842e16090 R15: 00007ffd55217868
 </TASK>
INFO: task syz.5.1165:11926 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.1165      state:D stack:28728 pid:11926 tgid:11923 ppid:11455  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x290
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9842b9acb9
RSP: 002b:00007f98439cb028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f9842e16180 RCX: 00007f9842b9acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f9842e16180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9842e16218 R14: 00007f9842e16180 R15: 00007ffd55217868
 </TASK>

Showing all locks held in the system:
5 locks held by kworker/1:1/33:
 #0: ffff888104af7148 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90000a97bc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff88816d029198 (&dev->mutex){....}-{4:4}, at: hub_event+0x17f/0x4f30
 #3: ffff88816d02c518 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x217a/0x4f30
 #4: ffff88810bcf6668 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_event+0x21a2/0x4f30
1 lock held by khungtaskd/35:
 #0: ffffffff8e341ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/1:2/910:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc900079a7bc0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff8881af6c4240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x202/0x3d0
2 locks held by getty/5662:
 #0: ffff888113d480a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
2 locks held by syz-executor/9584:
1 lock held by syz.5.1165/11924:
 #0: ffff88816d63a0e0 (&type->s_umount_key#57){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.1165/11925:
 #0: ffff88816d63a0e0 (&type->s_umount_key#57){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.1165/11926:
 #0: ffff88816d63a0e0 (&type->s_umount_key#57){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.4.1725/14273:
 #0: ffff88816d63a0e0 (&type->s_umount_key#57){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
3 locks held by syz.7.1788/14532:
 #0: ffff8881bc570ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_unregister_dev+0x212/0x5a0
 #1: ffff8881bc5700c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x640/0x10e0
 #2: ffffffff8e347638 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xf90/0xfe0
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 14537 Comm: syz.6.1789 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:preempt_count_add+0x8/0x190
Code: eb 8c e9 f5 fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 <53> 49 bf 00 00 00 00 00 fc ff df 48 c7 c0 e0 b3 cc 99 48 c1 e8 03
RSP: 0000:ffffc900090bf968 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000296 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8be09640 RDI: 0000000000000001
RBP: 000000000021a310 R08: ffffffff8fc26477 R09: 1ffffffff1f84c8e
R10: dffffc0000000000 R11: fffffbfff1f84c8f R12: ffffffff99ed4b48
R13: 0000000000000000 R14: ffffffff99ed4b50 R15: ffffea0000000000
FS:  000055557907d500(0000) GS:ffff88818e409000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f959e887e20 CR3: 00000001a7322000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 _raw_spin_lock_irqsave+0x24/0x60
 debug_object_activate+0x83/0x580
 call_rcu+0x43/0x890
 kmem_cache_free+0x481/0x610
 exit_mmap+0x572/0xb60
 __mmput+0x118/0x430
 exit_mm+0x168/0x220
 do_exit+0x826/0x25c0
 do_group_exit+0x21b/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x2210/0x2210
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fed80b9acb9
Code: Unable to access opcode bytes at 0x7fed80b9ac8f.
RSP: 002b:00007fff7f720978 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fed80b9acb9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff7f7209dc R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000124
R13: 00000000000927c0 R14: 0000000000071a8c R15: 00007fff7f720a30
 </TASK>
