syzbot

INFO: task kworker/u4:2:42 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:2    state:D stack:19576 pid:42    tgid:42    ppid:2      flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:0)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6778
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
 rwsem_down_write_slowpath+0xeea/0x13b0 kernel/locking/rwsem.c:1178
 __down_write_common+0x1aa/0x200 kernel/locking/rwsem.c:1306
 f2fs_down_write fs/f2fs/f2fs.h:2133 [inline]
 f2fs_balance_fs+0x500/0x730 fs/f2fs/segment.c:437
 f2fs_write_inode+0x3f0/0x470 fs/f2fs/inode.c:823
 write_inode fs/fs-writeback.c:1473 [inline]
 __writeback_single_inode+0x69b/0xfc0 fs/fs-writeback.c:1690
 writeback_sb_inodes+0x8e3/0x1220 fs/fs-writeback.c:1916
 __writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:1987
 wb_writeback+0x461/0xc70 fs/fs-writeback.c:2094
 wb_check_background_flush fs/fs-writeback.c:2164 [inline]
 wb_do_writeback fs/fs-writeback.c:2252 [inline]
 wb_workfn+0xc33/0xfb0 fs/fs-writeback.c:2279
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x90f/0x1420 kernel/workqueue.c:2703
 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2784
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8d92d060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #0: ffffffff8d92d060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #0: ffffffff8d92d060 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6613
4 locks held by kworker/u4:2/42:
 #0: ffff888142641d38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline]
 #0: ffff888142641d38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2703
 #1: ffffc90000b2fd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline]
 #1: ffffc90000b2fd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2703
 #2: ffff88801e8380e0 (&type->s_umount_key#46){++++}-{3:3}, at: super_trylock_shared+0x22/0xf0 fs/super.c:610
 #3: ffff88807e7292a8 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2133 [inline]
 #3: ffff88807e7292a8 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x500/0x730 fs/f2fs/segment.c:437
2 locks held by getty/4808:
 #0: ffff88814b2560a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
4 locks held by syz-executor364/5075:

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x310 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+0xfaf/0xff0 kernel/hung_task.c:379
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5075 Comm: syz-executor364 Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x0/0x80 kernel/kcov.c:312
Code: 89 11 48 c7 44 0a 08 05 00 00 00 48 89 44 0a 10 48 89 74 0a 18 4c 89 44 0a 20 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <f3> 0f 1e fa 4c 8b 04 24 65 48 8b 0d 00 36 75 7e 65 8b 05 01 36 75
RSP: 0018:ffffc9000445eaa8 EFLAGS: 00000246
RAX: 1ffffd4000397ae8 RBX: 00fff00000000021 RCX: ffff888012d73b80
RDX: 0000000000000000 RSI: 00fff00000000021 RDI: ffffffffffffffff
RBP: 1ffffd4000397ae9 R08: ffffffff83da1b88 R09: 1ffffd4000397ae8
R10: dffffc0000000000 R11: fffff94000397ae9 R12: 0000000000000000
R13: ffffea0001cbd740 R14: dffffc0000000000 R15: ffffea0001cbd748
FS:  00007f7dc1e246c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020ffd000 CR3: 000000001a3ec000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 PagePoisoned include/linux/page-flags.h:298 [inline]
 ClearPageUptodate include/linux/page-flags.h:773 [inline]
 f2fs_finish_read_bio+0x2ea/0xb30 fs/f2fs/data.c:158
 f2fs_submit_page_read+0x163/0x190 fs/f2fs/data.c:1178
 f2fs_get_read_data_page+0x50e/0x850 fs/f2fs/data.c:1348
 f2fs_get_lock_data_page+0x52/0xe0 fs/f2fs/data.c:1396
 move_data_page fs/f2fs/gc.c:1432 [inline]
 gc_data_segment fs/f2fs/gc.c:1641 [inline]
 do_garbage_collect+0x3941/0x81e0 fs/f2fs/gc.c:1766
 f2fs_gc+0xeff/0x3170 fs/f2fs/gc.c:1869
 f2fs_balance_fs+0x549/0x730 fs/f2fs/segment.c:439
 f2fs_map_blocks+0x2e75/0x4710 fs/f2fs/data.c:1790
 f2fs_preallocate_blocks fs/f2fs/file.c:4581 [inline]
 f2fs_file_write_iter+0xf21/0x23a0 fs/f2fs/file.c:4790
 call_write_iter include/linux/fs.h:2020 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x792/0xb20 fs/read_write.c:584
 ksys_write+0x1a0/0x2c0 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f7dc1e67789
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 18 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7dc1e24218 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7dc1ef36c8 RCX: 00007f7dc1e67789
RDX: 0000000000ffe000 RSI: 0000000020000000 RDI: 0000000000000006
RBP: 00007f7dc1ef36c0 R08: 00007f7dc1e23fb7 R09: 0000000000000000
R10: 0000000000000012 R11: 0000000000000246 R12: 00007f7dc1ec0708
R13: 0073746e6576652e R14: 652e79726f6d656d R15: 00007f7dc1ebb07e
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.969 msecs