INFO: task syz-executor.0:5342 blocked for more than 143 seconds.
      Not tainted 6.3.0-syzkaller-12423-g865fdb08197e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D
 stack:19704 pid:5342  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0x18c5/0x4910 kernel/sched/core.c:6669
 schedule+0xbf/0x180 kernel/sched/core.c:6745
 wb_wait_for_completion+0x162/0x290 fs/fs-writeback.c:192
 sync_inodes_sb+0x293/0xab0 fs/fs-writeback.c:2730
 sync_filesystem+0x16b/0x220 fs/sync.c:64
 generic_shutdown_super+0x6b/0x340 fs/super.c:473
 kill_block_super+0x80/0xe0 fs/super.c:1407
 deactivate_locked_super+0xa0/0x110 fs/super.c:331
 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1177
 task_work_run+0x246/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x60/0x260 kernel/entry/common.c:297
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7facfc48d567
RSP: 002b:00007fff5fb216a8 EFLAGS: 00000246
 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007facfc48d567
RDX: 00007fff5fb21779 RSI: 000000000000000a RDI: 00007fff5fb21770
RBP: 00007fff5fb21770 R08: 00000000ffffffff R09: 00007fff5fb21540
R10: 000055555612d893 R11: 0000000000000246 R12: 00007facfc4e6b74
R13: 00007fff5fb22830 R14: 000055555612d810 R15: 00007fff5fb22870
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/u4:0/10:
 #0: 
ffff88814519d138
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x77a/0x10c0 kernel/workqueue.c:2378
 #1: 
ffffc900000f7d20
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x7c0/0x10c0 kernel/workqueue.c:2380
 #2: ffff888028cb8650
 (
sb_internal
#2
){.+.+}-{0:0}
, at: xfs_bmapi_convert_delalloc+0x263/0x1310 fs/xfs/libxfs/xfs_bmap.c:4521
 #3: 
ffff888073da9858
 (
&xfs_nondir_ilock_class#3){++++}-{3:3}, at: rcu_lock_acquire+0x9/0x30 include/linux/rcupdate.h:327
2 locks held by kworker/u4:1/12:
1 lock held by rcu_tasks_kthre/13:
 #0: 
ffffffff8d1260b0
 (
rcu_tasks.tasks_gp_mutex
){+.+.}-{3:3}
, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:518
1 lock held by rcu_tasks_trace/14:
 #0: 
ffffffff8d126470 (rcu_tasks_trace.tasks_gp_mutex
){+.+.}-{3:3}
, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:518
1 lock held by khungtaskd/28:
 #0: 
ffffffff8d125ee0
 (
rcu_read_lock
){....}-{1:2}
, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/4741:
 #0: ffff88802bc72098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900015802f0 (&ldata->atomic_read_lock){+.+.}-{3:3}
, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2176
6 locks held by kworker/1:4/5004:
2 locks held by syz-executor.0/5342:
 #0: ffff888028cb80e0 (&type->s_umount_key#50){+.+.}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:361
 #1: 
ffff888146df27d0
 (
&bdi->wb_switch_rwsem
){+.+.}-{3:3}
, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:364 [inline]
, at: sync_inodes_sb+0x274/0xab0 fs/fs-writeback.c:2728

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

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.3.0-syzkaller-12423-g865fdb08197e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x494/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x183/0x2d0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xeba/0xf00 kernel/hung_task.c:379
 kthread+0x2aa/0x340 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5004 Comm: kworker/1:4 Not tainted 6.3.0-syzkaller-12423-g865fdb08197e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Workqueue: xfs-buf/loop0 xfs_buf_ioend_work
RIP: 0010:io_serial_out+0x7a/0xb0 drivers/tty/serial/8250/8250_port.c:476
Code: fc 89 e9 41 d3 e7 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 d0 98 28 fd 44 03 3b 44 89 f0 44 89 fa ee <5b> 41 5c 41 5e 41 5f 5d c3 89 e9 80 e1 07 38 c1 7c ab 48 89 ef e8
RSP: 0018:ffffc900047cf3f0 EFLAGS: 00000002
RAX: 0000000000000036 RBX: ffffffff92089600 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: 0000000000000000 RDI: 0000000000000020
RBP: 0000000000000000 R08: ffffffff84bc3fd7 R09: ffffed1003ba6047
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 0000000000000036 R14: 0000000000000036 R15: 00000000000003f8
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e3ee399600 CR3: 000000000cf2f000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 serial8250_console_write+0x1281/0x1810 drivers/tty/serial/8250/8250_port.c:3458