INFO: task kworker/u8:10:2837 blocked for more than 143 seconds.
      Not tainted 6.9.0-rc7-syzkaller-00188-gba16c1cf11c9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:10   state:D stack:21128 pid:2837  tgid:2837  ppid:2      flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:0)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x1a55/0x4bf0 kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0x147/0x320 kernel/sched/core.c:6838
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6895
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a0/0xd60 kernel/locking/mutex.c:752
 exfat_write_inode+0x65/0x120 fs/exfat/inode.c:105
 write_inode fs/fs-writeback.c:1498 [inline]
 __writeback_single_inode+0x6b9/0x1070 fs/fs-writeback.c:1715
 writeback_sb_inodes+0x901/0x1250 fs/fs-writeback.c:1941
 __writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:2012
 wb_writeback+0x467/0xcb0 fs/fs-writeback.c:2119
 wb_check_background_flush fs/fs-writeback.c:2189 [inline]
 wb_do_writeback fs/fs-writeback.c:2277 [inline]
 wb_workfn+0xc8a/0x10c0 fs/fs-writeback.c:2304
 process_one_work kernel/workqueue.c:3267 [inline]
 process_scheduled_works+0xa0c/0x17a0 kernel/workqueue.c:3348
 worker_thread+0xa5c/0xff0 kernel/workqueue.c:3429
 kthread+0x2ec/0x380 kernel/kthread.c:388
 ret_from_fork+0x47/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8dd321a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #0: ffffffff8dd321a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #0: ffffffff8dd321a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6614
4 locks held by kworker/u8:10/2837:
 #0: ffff88801a2ae948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3242 [inline]
 #0: ffff88801a2ae948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x8dc/0x17a0 kernel/workqueue.c:3348
 #1: ffffc9000aa7fd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3243 [inline]
 #1: ffffc9000aa7fd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x917/0x17a0 kernel/workqueue.c:3348
 #2: ffff88801dbcc0e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:561
 #3: ffff88801dbca0e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_write_inode+0x65/0x120 fs/exfat/inode.c:105
2 locks held by getty/4817:
 #0: ffff888029cf90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000312b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b1/0x1e10 drivers/tty/n_tty.c:2201
3 locks held by syz-executor.0/5414:

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.9.0-rc7-syzkaller-00188-gba16c1cf11c9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x23d/0x360 lib/dump_stack.c:114
 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x194/0x2f0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xfce/0x1010 kernel/hung_task.c:380
 kthread+0x2ec/0x380 kernel/kthread.c:388
 ret_from_fork+0x47/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5414 Comm: syz-executor.0 Not tainted 6.9.0-rc7-syzkaller-00188-gba16c1cf11c9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:arch_static_branch include/trace/events/preemptirq.h:36 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:207 [inline]
RIP: 0010:trace_irq_disable+0x2/0x110 include/trace/events/preemptirq.h:36
Code: 00 00 00 48 8b 3c 24 eb 1f 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 56 <53> 66 90 65 8b 05 e0 f1 66 7e 83 f8 08 73 3f 89 c3 48 89 d8 48 c1
RSP: 0018:ffffc900046a73b0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffff88802378bc00
RDX: 0000000000000000 RSI: ffffffff8b6ab3e0 RDI: ffffffff821c8a82
RBP: ffffc900046a7500 R08: ffffffff821c8a6b R09: ffffffff827b1bf3
R10: 0000000000000003 R11: ffff88802378bc00 R12: 0000000000000246
R13: dffffc0000000000 R14: 0000000000000200 R15: ffff88801cc8c500
FS:  00005555638d8480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc980fb0680 CR3: 000000007850c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lookup_bh_lru fs/buffer.c:1362 [inline]
 __find_get_block+0x172/0x10d0 fs/buffer.c:1397
 bdev_getblk+0x34/0x600 fs/buffer.c:1423
 __bread_gfp+0xa8/0x420 fs/buffer.c:1474
 sb_bread include/linux/buffer_head.h:321 [inline]
 exfat_get_dentry+0x537/0x730 fs/exfat/dir.c:691
 exfat_readdir fs/exfat/dir.c:121 [inline]
 exfat_iterate+0xbd3/0x33e0 fs/exfat/dir.c:261
 wrap_directory_iterator+0x90/0xd0 fs/readdir.c:67
 iterate_dir+0x535/0x6f0 fs/readdir.c:110
 __do_sys_getdents64 fs/readdir.c:409 [inline]
 __se_sys_getdents64+0x209/0x4f0 fs/readdir.c:394
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x84/0x190 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f7347ea9263
Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 32 8b fa ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 b0 ff ff ff f7 d8
RSP: 002b:00007ffc17d60598 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00005555638e1970 RCX: 00007f7347ea9263
RDX: 0000000000008000 RSI: 00005555638e1970 RDI: 0000000000000005
RBP: 00005555638e1944 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffb0
R13: 0000000000000010 R14: 00005555638e1940 R15: 0000000000000003
 </TASK>