INFO: task syz.1.1256:312 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1256      state:D stack:21704 pid:312   tgid:308   ppid:29166  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
 __iterate_supers+0x126/0x290
 ksys_sync+0x94/0x150
 __ia32_sys_sync+0xe/0x20
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcb1098ebe9
RSP: 002b:00007fcb1178b038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fcb10bc5fa0 RCX: 00007fcb1098ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fcb10bc5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcb10bc6038 R14: 00007fcb10bc5fa0 R15: 00007ffd4196a768
 </TASK>
INFO: task syz.3.1267:861 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1267      state:D stack:25128 pid:861   tgid:860   ppid:376    task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x872/0xfe0
 down_write+0x1ab/0x1f0
 super_lock+0x25c/0x3b0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x4da/0x950
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3b28b8ebe9
RSP: 002b:00007f3b29aac038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f3b28dc5fa0 RCX: 00007f3b28b8ebe9
RDX: 0000000000000000 RSI: 0000200000000040 RDI: ffffffff80000201
RBP: 00007f3b28c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3b28dc6038 R14: 00007f3b28dc5fa0 R15: 00007fffb9d39208
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139f20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by kworker/u10:1/36:
 #0: ffff88801a489148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900006afbc0 ((reaper_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
2 locks held by getty/5673:
 #0: ffff88810d4990a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
3 locks held by syz-executor/25666:
1 lock held by syz.1.1256/312:
 #0: ffff88802239e0e0 (&type->s_umount_key#56){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.3.1267/861:
 #0: ffff88802239e0e0 (&type->s_umount_key#56){++++}-{4:4}, at: super_lock+0x25c/0x3b0
3 locks held by syz.0.1580/7072:
 #0: ffff88801b694428 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x211/0xb30
 #1: ffff88810a6da370 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: shmem_file_write_iter+0x7f/0x120
 #2: ffffffff8e139f20 (rcu_read_lock){....}-{1:3}, at: get_mem_cgroup_from_mm+0x38/0x2a0
3 locks held by syz.8.1582/7125:

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

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+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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 25666 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:inode_io_list_move_locked+0x119/0x440
Code: 01 00 00 4c 89 e7 e8 36 57 8e 02 84 c0 4c 89 34 24 0f 84 9e 00 00 00 e8 95 c8 7d ff 4d 8d af 98 01 00 00 4c 89 e8 48 c1 e8 03 <48> b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ef e8 8f 36
RSP: 0018:ffffc90002c8f690 EFLAGS: 00000a02
RAX: 1ffff110223c7a4a RBX: ffff888020bd8080 RCX: ffff88810ea9d640
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888111e3d250
RBP: 0000000000000000 R08: ffff888111e3d13b R09: 1ffff110223c7a27
R10: dffffc0000000000 R11: ffffed10223c7a28 R12: ffff888111e3d248
R13: ffff888111e3d250 R14: ffff888020bd8068 R15: ffff888111e3d0b8
FS:  0000555565a5a500(0000) GS:ffff8880b8618000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e70cff8 CR3: 0000000127dde000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 writeback_single_inode+0x2b0/0x6a0
 sync_inode_metadata+0xb9/0x110
 f2fs_write_checkpoint+0xb06/0x1df0
 kill_f2fs_super+0x2c3/0x6c0
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f553178ff17
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 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 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffdd4bbb658 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f5531811c05 RCX: 00007f553178ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdd4bbb710
RBP: 00007ffdd4bbb710 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdd4bbc7a0
R13: 00007f5531811c05 R14: 000000000007aaff R15: 00007ffdd4bbc7e0
 </TASK>
