INFO: task kworker/u9:1:32 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u9:1    state:D stack:22752 pid:32    tgid:32    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: writeback wb_workfn (flush-7:9)
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 jfs_commit_inode+0x1ca/0x530
 jfs_write_inode+0x145/0x220
 __writeback_single_inode+0x75a/0x11a0
 writeback_sb_inodes+0x992/0x1a20
 __writeback_inodes_wb+0x111/0x240
 wb_writeback+0x46a/0xb70
 wb_workfn+0x95b/0xf50
 process_scheduled_works+0xb6e/0x18c0
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task syz.6.393:8448 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.393       state:D stack:24960 pid:8448  tgid:8447  ppid:6820   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 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+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f930079c799
RSP: 002b:00007f9301624028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f9300a15fa0 RCX: 00007f930079c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f9300a15fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9300a16038 R14: 00007f9300a15fa0 R15: 00007ffe2e1b7c08
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/u9:1/32:
 #0: ffff888162a80948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90000a77c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff8881118e20e0 (&type->s_umount_key#91){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff8881163c38b8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5634:
 #0: ffff8881717ec0a0 (&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
4 locks held by syz-executor/6119:
4 locks held by syz.9.367/8324:
1 lock held by syz.6.393/8448:
 #0: ffff88810ed220e0 (&type->s_umount_key#64){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.717/11053:
 #0: ffff88810ed220e0 (&type->s_umount_key#64){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.813/11507:
 #0: ffff8881118e20e0 (&type->s_umount_key#91){++++}-{4:4}, at: super_lock+0x289/0x3d0
1 lock held by syz.6.873/11831:
 #0: ffff88810ed220e0 (&type->s_umount_key#64){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.6.873/11832:
 #0: ffff88810ed220e0 (&type->s_umount_key#64){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz.0.882/11903:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 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/0x300
 sys_info+0x135/0x170
 watchdog+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 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: 6119 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:mark_lock+0x3c/0x190
Code: 00 03 00 83 f9 01 bb 09 00 00 00 83 db 00 83 fa 08 0f 45 da bd 01 00 00 00 89 d9 d3 e5 25 ff 1f 00 00 48 0f a3 05 c4 fb 81 12 <73> 10 48 69 c0 c8 00 00 00 48 8d 88 10 d4 c4 93 eb 42 83 3d 8b 8b
RSP: 0018:ffffc9000776f390 EFLAGS: 00000003
RAX: 00000000000008bf RBX: 0000000000000002 RCX: 0000000000000002
RDX: 0000000000000002 RSI: ffff88816e8f0ba8 RDI: ffff88816e8f0000
RBP: 0000000000000004 R08: ffffffff82517b64 R09: ffff8881b8c74a58
R10: ffffc9000776f620 R11: fffff52000eedef2 R12: 0000000000000004
R13: ffff88816e8f0ba8 R14: ffff88816e8f0000 R15: 0000000000000002
FS:  000055556c65c500(0000) GS:ffff8882a9460000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faf1dde7158 CR3: 00000001ba772000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __lock_acquire+0x9d0/0x2cf0
 lock_acquire+0xf0/0x2e0
 _raw_spin_lock+0x2e/0x40
 writeback_single_inode+0x34/0xdc0
 sync_inode_metadata+0x122/0x1d0
 f2fs_write_checkpoint+0xb93/0x26a0
 kill_f2fs_super+0x314/0x720
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x437/0x4d0
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xed/0x480
 do_syscall_64+0x32d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff94c79d9d7
Code: a2 c7 05 1c fd 24 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:00007ffed59b6438 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007ff94c832050 RCX: 00007ff94c79d9d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffed59b64f0
RBP: 00007ffed59b64f0 R08: 00007ffed59b74f0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffed59b7580
R13: 00007ff94c832050 R14: 000000000001b1c5 R15: 00007ffed59b75c0
 </TASK>
