INFO: task kworker/u4:8:2439 blocked for more than 143 seconds.
      Not tainted 6.6.0-rc2-syzkaller-00244-g27bbf45eae9c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:8    state:D stack:24080 pid:2439  ppid:2      flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:0)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0xee1/0x5a10 kernel/sched/core.c:6695
 schedule+0xe7/0x1b0 kernel/sched/core.c:6771
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6830
 rwsem_down_write_slowpath+0x53d/0x12a0 kernel/locking/rwsem.c:1178
 __down_write_common kernel/locking/rwsem.c:1306 [inline]
 __down_write kernel/locking/rwsem.c:1315 [inline]
 down_write+0x1d3/0x200 kernel/locking/rwsem.c:1574
 f2fs_down_write fs/f2fs/f2fs.h:2132 [inline]
 f2fs_balance_fs+0x553/0x750 fs/f2fs/segment.c:437
 f2fs_write_inode+0x4b9/0xd90 fs/f2fs/inode.c:823
 write_inode fs/fs-writeback.c:1456 [inline]
 __writeback_single_inode+0xa81/0xe70 fs/fs-writeback.c:1668
 writeback_sb_inodes+0x599/0x1010 fs/fs-writeback.c:1894
 __writeback_inodes_wb+0xff/0x2d0 fs/fs-writeback.c:1965
 wb_writeback+0x7f8/0xa90 fs/fs-writeback.c:2072
 wb_check_old_data_flush fs/fs-writeback.c:2176 [inline]
 wb_do_writeback fs/fs-writeback.c:2229 [inline]
 wb_workfn+0xa02/0xfd0 fs/fs-writeback.c:2257
 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784
 kthread+0x33c/0x440 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>

Showing all locks held in the system:
1 lock held by ksoftirqd/1/22:
 #0: ffff8880b993c718 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:558
1 lock held by khungtaskd/29:
 #0: ffffffff8cbab2e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:303 [inline]
 #0: ffffffff8cbab2e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:749 [inline]
 #0: ffffffff8cbab2e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6613
4 locks held by kworker/u4:8/2439:
 #0: ffff88801525fd38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x787/0x15c0 kernel/workqueue.c:2605
 #1: ffffc90009dc7d80 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7e9/0x15c0 kernel/workqueue.c:2606
 #2: ffff8880255a20e0 (&type->s_umount_key#53){++++}-{3:3}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:607
 #3: ffff88802a4112a8 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2132 [inline]
 #3: ffff88802a4112a8 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x553/0x750 fs/f2fs/segment.c:437
3 locks held by kworker/u4:10/2503:
 #0: ffff8880b993c718 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:558
 #1: ffff8880b9928888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2d9/0x900 kernel/sched/psi.c:999
 #2: ffff8880b99297d8 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x6bd/0xea0 kernel/time/timer.c:1112
2 locks held by getty/4788:
 #0: ffff88814b0390a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc5/0x1480 drivers/tty/n_tty.c:2206
4 locks held by syz-executor.0/5507:
1 lock held by syz-executor.0/6085:

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.6.0-rc2-syzkaller-00244-g27bbf45eae9c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x277/0x380 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xf87/0x1210 kernel/hung_task.c:379
 kthread+0x33c/0x440 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2408 Comm: kworker/u4:7 Not tainted 6.6.0-rc2-syzkaller-00244-g27bbf45eae9c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Workqueue:  0x0 (events_unbound)
RIP: 0010:switch_ldt+0xa2/0x1b0 arch/x86/kernel/ldt.c:113
Code: 00 00 00 00 fc ff df 48 89 c1 83 e0 07 48 c1 e9 03 83 c0 03 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 e1 00 00 00 8b 1d 1e d2 fe 10 <31> ff 89 de e8 95 bc 58 00 85 db 75 1f e8 1c c1 58 00 31 ff 65 8b
RSP: 0018:ffffc90009e17c40 EFLAGS: 00000097
RAX: 0000000000000003 RBX: 0000000000000000 RCX: 1ffffffff245babc
RDX: 0000000000000004 RSI: ffffffff812f038e RDI: ffff88802a24bfc0
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1005449810
R10: ffff88802a24c083 R11: 0000000000000000 R12: ffff8880250ba2f0
R13: ffff8880b993d220 R14: ffff88801eeb22e8 R15: ffff8880b993c700
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f70ad9fe000 CR3: 0000000073d87000 CR4: 0000000000350ee0
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 context_switch kernel/sched/core.c:5364 [inline]
 __schedule+0xccd/0x5a10 kernel/sched/core.c:6695
 schedule+0xe7/0x1b0 kernel/sched/core.c:6771
 worker_thread+0x2e1/0x1290 kernel/workqueue.c:2799
 kthread+0x33c/0x440 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>