INFO: task syz.7.431:8042 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.431       state:D stack:28808 pid:8042  tgid:8040  ppid:7752   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6ba/0x920
 down_read+0x9c/0x330
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x120/0x240
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f784c19ce59
RSP: 002b:00007f784d03c028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f784c415fa0 RCX: 00007f784c19ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f784c415fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f784c416038 R14: 00007f784c415fa0 R15: 00007ffead8ca0e8
 </TASK>
INFO: task syz.3.434:8054 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.434       state:D stack:24544 pid:8054  tgid:8053  ppid:5802   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6ba/0x920
 down_read+0x9c/0x330
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x120/0x240
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fda9ab9ce59
RSP: 002b:00007fda9bb1e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fda9ae15fa0 RCX: 00007fda9ab9ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fda9ae15fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fda9ae16038 R14: 00007fda9ae15fa0 R15: 00007ffe68508148
 </TASK>
INFO: task syz.3.434:8062 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.434       state:D stack:28808 pid:8062  tgid:8053  ppid:5802   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6ba/0x920
 down_read+0x9c/0x330
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x120/0x240
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fda9ab9ce59
RSP: 002b:00007fda9bafd028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fda9ae16090 RCX: 00007fda9ab9ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fda9ae16090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fda9ae16128 R14: 00007fda9ae16090 R15: 00007ffe68508148
 </TASK>

Showing all locks held in the system:
2 locks held by kworker/1:2/33:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90000a97c40 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
1 lock held by khungtaskd/35:
 #0: ffffffff8e959c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5441:
 #0: ffff8881780ce0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
3 locks held by syz-executor/6562:
1 lock held by syz.7.431/8042:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.434/8054:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.434/8062:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.435/8193:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.435/8199:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.437/8279:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.439/8286:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.444/8541:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.4.447/8613:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.451/8653:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.6.455/8805:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.456/8858:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.458/8867:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.458/8868:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.463/8933:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.462/9001:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.462/9004:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.465/9003:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.465/9005:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.470/9064:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.470/9066:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.471/9157:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.4.469/9160:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.4.469/9161:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.472/9205:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.475/9296:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.6.478/9310:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.6.478/9315:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.482/9372:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.482/9373:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.483/9475:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.488/9496:
 #0: ffff88816a3a00d8 (&type->s_umount_key#98){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz-executor/9499:
 #0: ffff88802b61cea0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_unregister_dev+0x22a/0x5b0

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
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/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6562 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:lock_release+0x2d7/0x3c0
Code: 7d 9e 11 00 00 00 00 eb b5 e8 c5 fd 13 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 b5 38 9e 11 48 3b 44 24 28 75 44 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 9a fe 16 0a cc 48 8d 3d 72 62 94
RSP: 0018:ffffc90003fbf7f8 EFLAGS: 00000282
RAX: 7a52fcd5a4c97300 RBX: 0000000000000202 RCX: 0000000080000001
RDX: 0000000000000002 RSI: ffffffff8e260595 RDI: ffffffff8c2ab880
RBP: ffff888172558bf0 R08: ffff88801ee781fb R09: 1ffff11003dcf03f
R10: dffffc0000000000 R11: ffffed1003dcf040 R12: 0000000000000002
R13: 0000000000000002 R14: ffff88816ec3cc30 R15: ffff888172558000
FS:  00005555819d1500(0000) GS:ffff8882a9218000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe844ac0440 CR3: 000000017763a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 _raw_spin_unlock+0x16/0x50
 f2fs_write_checkpoint+0xbde/0x2710
 kill_f2fs_super+0x2f6/0x700
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x3d3/0x460
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0x1fa/0x730
 do_syscall_64+0x353/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f28a659e097
Code: a2 c7 05 5c 06 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffcf8ab1318 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f28a66322ca RCX: 00007f28a659e097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcf8ab13d0
RBP: 00007ffcf8ab13d0 R08: 00007ffcf8ab23d0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcf8ab2460
R13: 00007f28a66322ca R14: 00000000000229f8 R15: 00007ffcf8ab24a0
 </TASK>
