INFO: task kworker/u4:2:154 blocked for more than 143 seconds.
      Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:2    state:D stack:20992 pid:  154 ppid:     2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:3)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5023 [inline]
 __schedule+0x12c4/0x4590 kernel/sched/core.c:6369
 schedule+0x11b/0x1f0 kernel/sched/core.c:6452
 rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
 __down_write_common kernel/locking/rwsem.c:1284 [inline]
 __down_write kernel/locking/rwsem.c:1293 [inline]
 down_write+0x164/0x170 kernel/locking/rwsem.c:1542
 f2fs_balance_fs+0x4d4/0x6a0 fs/f2fs/segment.c:529
 f2fs_write_inode+0x4c3/0x540 fs/f2fs/inode.c:727
 write_inode fs/fs-writeback.c:1475 [inline]
 __writeback_single_inode+0x644/0xe30 fs/fs-writeback.c:1680
 writeback_sb_inodes+0xbf0/0x1a50 fs/fs-writeback.c:1905
 __writeback_inodes_wb+0x114/0x400 fs/fs-writeback.c:1976
 wb_writeback+0x465/0xc50 fs/fs-writeback.c:2081
 wb_check_old_data_flush fs/fs-writeback.c:2181 [inline]
 wb_do_writeback fs/fs-writeback.c:2234 [inline]
 wb_workfn+0xc55/0x1130 fs/fs-writeback.c:2263
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2306
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2453
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8c91b920 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
4 locks held by kworker/u4:2/154:
 #0: ffff8880141b4138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2279
 #1: ffffc90001d4fd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2281
 #2: ffff888076e4e0e0 (&type->s_umount_key#52){++++}-{3:3}, at: trylock_super+0x1b/0xf0 fs/super.c:418
 #3: ffff8880190e1108 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x4d4/0x6a0 fs/f2fs/segment.c:529
2 locks held by getty/3274:
 #0: ffff888024e42098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc90002bb32e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1da0 drivers/tty/n_tty.c:2147
2 locks held by syz-executor.3/12895:
1 lock held by syz-executor.2/15613:

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.104-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
 watchdog+0xe72/0xeb0 kernel/hung_task.c:295
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 12895 Comm: syz-executor.3 Not tainted 5.15.104-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
RIP: 0010:__lock_acquire+0xd98/0x1ff0 kernel/locking/lockdep.c:4994
Code: ff 0f 85 b8 08 00 00 89 44 24 2c 48 89 d8 48 c1 e8 03 80 3c 38 00 74 12 48 89 df e8 02 b8 66 00 48 bf 00 00 00 00 00 fc ff df <4c> 89 3b 48 8b 44 24 40 0f b6 04 38 84 c0 0f 85 54 0b 00 00 41 8b
RSP: 0018:ffffc90004615920 EFLAGS: 00000046
RAX: 1ffff11004727c2e RBX: ffff88802393e170 RCX: ffffffff8162478f
RDX: 0000000000000000 RSI: 0000000000000008 RDI: dffffc0000000000
RBP: ffff88802393e110 R08: dffffc0000000000 R09: fffffbfff1f76c39
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000002
R13: ffff88802393e118 R14: 1ffff11004727c22 R15: df005233996d3e3a
FS:  00007fdf62fb8700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d729000 CR3: 000000001a2fa000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622
 down_read+0x3b/0x50 kernel/locking/rwsem.c:1488
 check_valid_map fs/f2fs/gc.c:881 [inline]
 gc_data_segment fs/f2fs/gc.c:1450 [inline]
 do_garbage_collect+0x20d8/0x7600 fs/f2fs/gc.c:1670
 f2fs_gc+0x9e5/0x1ad0 fs/f2fs/gc.c:1764
 f2fs_balance_fs+0x4e8/0x6a0 fs/f2fs/segment.c:530
 f2fs_write_single_data_page+0xc2a/0x1830 fs/f2fs/data.c:2866
 f2fs_write_cache_pages fs/f2fs/data.c:3079 [inline]
 __f2fs_write_data_pages fs/f2fs/data.c:3230 [inline]
 f2fs_write_data_pages+0x17de/0x2c00 fs/f2fs/data.c:3257
 do_writepages+0x481/0x730 mm/page-writeback.c:2364
 filemap_fdatawrite_wbc+0x1d6/0x230 mm/filemap.c:400
 __filemap_fdatawrite_range mm/filemap.c:433 [inline]
 file_write_and_wait_range+0x1cb/0x2b0 mm/filemap.c:810
 f2fs_do_sync_file+0x650/0x19d0 fs/f2fs/file.c:274
 generic_write_sync include/linux/fs.h:2913 [inline]
 f2fs_file_write_iter+0x476/0xb80 fs/f2fs/file.c:4357
 __kernel_write+0x5b1/0xa60 fs/read_write.c:539
 __dump_emit+0x264/0x3a0 fs/coredump.c:875
 dump_user_range+0x91/0x320 fs/coredump.c:949
 elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
 do_coredump+0x1852/0x31e0 fs/coredump.c:826
 get_signal+0xc06/0x14e0 kernel/signal.c:2875
 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
 exc_general_protection+0x358/0x4f0 arch/x86/kernel/traps.c:562
 asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:562
RIP: 0033:0x7fdf68e67101
Code: c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 48 3d 01 f0 ff ff 73 01 <c3> 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:0000000020000480 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fdf68f87050 RCX: 00007fdf68e670f9
RDX: 00000000200000c0 RSI: 0000000020000480 RDI: 0000000010040080
RBP: 00007fdf68ec2b39 R08: 00000000200004c0 R09: 00000000200004c0
R10: 00000000200001c0 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffd5d3e894f R14: 00007fdf62fb8300 R15: 0000000000022000
 </TASK>