INFO: task syz.6.2405:29176 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.2405      state:D stack:25256 pid:29176 tgid:29175 ppid:21756  task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x4da/0x950
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1f3df8ebe9
RSP: 002b:00007f1f3ee6a038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f1f3e1b5fa0 RCX: 00007f1f3df8ebe9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: ffffffff80000600
RBP: 00007f1f3e011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000580 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1f3e1b6038 R14: 00007f1f3e1b5fa0 R15: 00007ffdbf6d4748
 </TASK>
INFO: lockdep is turned off.
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+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 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: 11671 Comm: syz.6.506 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_acquire+0x18b/0x360
Code: 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 4b f4 02 11 48 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e <41> 5f 5d c3 cc cc cc cc cc 65 8b 05 35 34 03 11 85 c0 75 ce 65 8b
RSP: 0018:ffffc9000296f550 EFLAGS: 00000286
RAX: 8417f00a21a29300 RBX: ffff888030e28b88 RCX: 8417f00a21a29300
RDX: 0000000000000000 RSI: ffffffff8be33660 RDI: ffffffff8be33620
RBP: ffffffff8409c610 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10061c520f R12: ffff888031896084
R13: ffff888030e29250 R14: 0000000000000000 R15: 0000000000000001
FS:  00007f98bf15a6c0(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000004941 CR3: 000000010a5a2000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 _raw_spin_lock+0x2e/0x40
 f2fs_write_checkpoint+0xab0/0x1df0
 kill_f2fs_super+0x2c3/0x6c0
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 do_exit+0x6b5/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f98be3c14a5
Code: Unable to access opcode bytes at 0x7f98be3c147b.
RSP: 002b:00007f98bf159f80 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007f98be5b5fa0 RCX: 00007f98be3c14a5
RDX: 00007f98bf159fc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f98be411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f98be5b6038 R14: 00007f98be5b5fa0 R15: 00007ffe4352dae8
 </TASK>
