INFO: task syz.3.453:9821 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.453       state:D stack:25128 pid:9821  tgid:9820  ppid:8978   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1854/0x4d60
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x98/0x2e0
 super_lock+0x2d6/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x516/0x990
 do_syscall_64+0xf0/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdafdb9acb9
RSP: 002b:00007fdafea2e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fdafde15fa0 RCX: 00007fdafdb9acb9
RDX: 0000000000000000 RSI: 0000200000000300 RDI: ffffffff80000802
RBP: 00007fdafdc08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdafde16038 R14: 00007fdafde15fa0 R15: 00007fff33dfb7e8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e13e760 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5636:
 #0: ffff8881749410a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45f/0x14a0
5 locks held by syz-executor/6058:
1 lock held by syz.3.453/9821:
 #0: ffff8880247960e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.631/11826:
 #0: ffff8880247960e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.721/12672:
 #0: ffff8880247960e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz-executor/12704:
 #0: ffffffff8e1441f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3f2/0x7e0
6 locks held by syz.4.780/13349:

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

NMI backtrace for cpu 1
CPU: 1 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+0x1a9/0x280
 nmi_cpu_backtrace+0x3a9/0x3e0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf5b/0xfa0
 kthread+0x726/0x8b0
 ret_from_fork+0x4d3/0x870
 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: 13070 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:debug_smp_processor_id+0x0/0x20
Code: e0 a0 1f 8e 4c 89 f6 e8 0e b0 69 f9 e9 67 ff ff ff cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 c7 c7 80 f9 de 8b 48 c7 c6 c0 f9 de 8b eb 1c 66 66
RSP: 0018:ffffc90004ac7208 EFLAGS: 00000283
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e13e760
RBP: ffffffff81d0c3d6 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90004ac73b8 R11: ffffffff81ad7f80 R12: 0000000000000002
R13: ffffffff8e13e760 R14: 0000000000000000 R15: 0000000000000000
FS:  000055557dfe0500(0000) GS:ffff88818e712000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557dffba28 CR3: 00000001a93e8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 rcu_is_watching+0x15/0xb0
 lock_acquire+0x5f/0x350
 is_bpf_text_address+0x47/0x2b0
 kernel_text_address+0xa5/0xe0
 __kernel_text_address+0xd/0x30
 unwind_get_return_address+0x4d/0x90
 arch_stack_walk+0xfb/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kmem_cache_free+0x199/0x680
 f2fs_destroy_node_manager+0x36b/0xd50
 f2fs_put_super+0xbe8/0x1260
 generic_shutdown_super+0x135/0x2c0
 kill_block_super+0x44/0x90
 kill_f2fs_super+0x3f7/0x720
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x437/0x4d0
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xe7/0x120
 do_syscall_64+0x2b3/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff0a219bf17
Code: a2 c7 05 7c 96 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:00007fff9678caf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007ff0a220471f RCX: 00007ff0a219bf17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff9678cbb0
RBP: 00007fff9678cbb0 R08: 00007fff9678dbb0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff9678dc40
R13: 00007ff0a220471f R14: 0000000000056e31 R15: 00007fff9678dc80
 </TASK>
