INFO: task syz.3.324:8506 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.324       state:D stack:24608 pid:8506  tgid:8504  ppid:7438   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: 0033:0x7fd6a919c799
RSP: 002b:00007fd6aa13d028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fd6a9415fa0 RCX: 00007fd6a919c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fd6a9415fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd6a9416038 R14: 00007fd6a9415fa0 R15: 00007ffc73bc1e78
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5634:
 #0: ffff8881122ad0a0 (&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
1 lock held by syz-executor/5792:
 #0: ffff88812103ade0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150
4 locks held by syz-executor/6025:
1 lock held by syz.3.324/8506:
 #0: ffff88811683c0e0 (&type->s_umount_key#55){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.498/10871:
 #0: ffff88811683c0e0 (&type->s_umount_key#55){++++}-{4:4}, at: super_lock+0x289/0x3d0
3 locks held by syz.8.508/10971:
 #0: ffff8881bbb702f8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff88810a66c420 (sb_writers#3){.+.+}-{0:0}, at: vfs_writev+0x2aa/0x990
 #2: ffff88811683c0e0 (&type->s_umount_key#55){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.648/12757:
 #0: ffff88811683c0e0 (&type->s_umount_key#55){++++}-{4:4}, at: super_lock+0x289/0x3d0
1 lock held by syz.3.648/12770:
 #0: ffff88811683c0e0 (&type->s_umount_key#55){++++}-{4:4}, at: super_lock+0x289/0x3d0
2 locks held by dhcpcd/13193:
 #0: ffff8881bf346208 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x9b/0x240
 #1: ffffffff8e7647b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by syz-executor/13408:
 #0: ffffffff8e7647b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
3 locks held by dhcpcd-run-hook/13782:

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

NMI backtrace for cpu 1
CPU: 1 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/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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6025 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_acquire+0x7/0x2cf0
Code: 00 b9 0a 00 00 00 5b e9 d7 55 00 00 5b c3 cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 <41> 54 53 48 81 ec e8 00 00 00 65 48 8b 05 87 72 7a 11 48 89 84 24
RSP: 0018:ffffc90006ccf478 EFLAGS: 00000006
RAX: 0000000000000000 RBX: 0000000000000246 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e75e520
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90006ccf580 R11: fffff52000d99eb3 R12: 0000000000000002
R13: ffffffff8e75e520 R14: 0000000000000000 R15: 0000000000000000
FS:  000055557f26c500(0000) GS:ffff88818de60000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559bc9066680 CR3: 000000011943c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_acquire+0xf0/0x2e0
 filemap_get_entry+0xe6/0x320
 __filemap_get_folio_mpol+0x6d/0xb00
 __get_node_folio+0x20f/0xe90
 f2fs_update_inode_page+0x83/0x2e0
 f2fs_write_checkpoint+0xbee/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: 0033:0x7f02a259d9d7
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:00007ffdca650268 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f02a2632050 RCX: 00007f02a259d9d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdca650320
RBP: 00007ffdca650320 R08: 00007ffdca651320 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdca6513b0
R13: 00007f02a2632050 R14: 0000000000012f18 R15: 00007ffdca6513f0
 </TASK>
