INFO: task kworker/u9:7:1090 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u9:7    state:D stack:21192 pid:1090  tgid:1090  ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:6)
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x872/0xfe0
 down_write+0x1ab/0x1f0
 f2fs_issue_checkpoint+0x39c/0x570
 f2fs_balance_fs_bg+0x54d/0x980
 f2fs_write_node_pages+0x146/0x6e0
 do_writepages+0x32e/0x550
 __writeback_single_inode+0x145/0xff0
 writeback_sb_inodes+0x6c7/0x1010
 __writeback_inodes_wb+0x111/0x240
 wb_writeback+0x44f/0xaf0
 wb_workfn+0xaef/0xef0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </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
4 locks held by kworker/u9:7/1090:
 #0: ffff88801b34d948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90006fe7bc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff8880488620e0 (&type->s_umount_key#76){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff88801f729410 (&sbi->gc_lock){+.+.}-{4:4}, at: f2fs_issue_checkpoint+0x39c/0x570
2 locks held by getty/5675:
 #0: ffff8881061980a0 (&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
7 locks held by syz-executor/10947:
4 locks held by syz.6.1556/13463:
1 lock held by syz.4.2492/16440:
 #0: ffff888110a740e0 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
2 locks held by syz.0.2576/16803:

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

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: 10947 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:f2fs_get_node_info+0x406/0x1480
Code: 80 3c 28 00 74 08 48 89 df e8 76 41 14 fe 48 8b 1b 45 31 ff 31 ff 48 89 de e8 b6 d4 b0 fd 48 85 db 74 3a e8 cc cf b0 fd eb 08 <e8> c5 cf b0 fd 45 31 ff 44 89 f8 48 83 c4 68 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90003d4f5e0 EFLAGS: 00000246
RAX: ffffffff840ede86 RBX: ffffc90003d4f698 RCX: ffff888023651cc0
RDX: 0000000000000000 RSI: ffffffff8e7448f0 RDI: ffff888110be8160
RBP: 0000000000000000 R08: ffff888023651cc0 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000000 R12: ffff888110be8000
R13: dffffc0000000000 R14: 00000000ffffffff R15: 1ffff920007a9ed3
FS:  0000555587f49500(0000) GS:ffff8881a3c15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f84ef9bd000 CR3: 000000002a030000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 read_node_folio+0x20a/0x3f0
 __get_node_folio+0x22a/0x1410
 f2fs_update_inode_page+0x82/0x190
 f2fs_write_checkpoint+0xb6e/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: 0033:0x7f4ab2b8fed7
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:00007fffc6f1f508 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f4ab2c11c05 RCX: 00007f4ab2b8fed7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffc6f1f5c0
RBP: 00007fffc6f1f5c0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffc6f20650
R13: 00007f4ab2c11c05 R14: 0000000000052141 R15: 00007fffc6f20690
 </TASK>
