INFO: task kworker/1:0:24 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:0     state:D stack:23528 pid:24    tgid:24    ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: xfs-sync/loop0 xfs_flush_inodes_worker
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 wb_wait_for_completion+0x15f/0x260
 sync_inodes_sb+0x1bb/0xa10
 xfs_flush_inodes_worker+0x61/0x80
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task syz.0.1:5919 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1         state:D stack:21048 pid:5919  tgid:5917  ppid:5846   task_flags:0x400740 flags:0x00004006
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x9a/0x270
 wait_for_completion+0x2bf/0x5d0
 __flush_work+0x9b9/0xbc0
 xfs_file_buffered_write+0x266/0x8a0
 __kernel_write_iter+0x428/0x910
 dump_user_range+0x8a0/0xc90
 elf_core_dump+0x337b/0x3990
 coredump_write+0x1169/0x1900
 vfs_coredump+0x1daa/0x2a50
 get_signal+0x1109/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fab8644f920
RSP: 002b:00007fab873d2c78 EFLAGS: 00000246
 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 00007fab867d5fa8 RCX: 00007fab8658eba9
RDX: 00007fab873d2c80 RSI: 00007fab873d2db0 RDI: 000000000000000b
RBP: 00007fab867d5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fab867d6038 R14: 00007ffe194e4830 R15: 00007ffe194e4918
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/1:0/24:
 #0: ffff8881124aa548 ((wq_completion)xfs-sync/loop0){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900001c7bc0 ((work_completion)(&mp->m_flush_inodes_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff88803a30e0e0 (&type->s_umount_key#51){++++}-{4:4}, at: xfs_flush_inodes_worker+0x45/0x80
 #3: 
ffff88801fd847d0
 (
&bdi->wb_switch_rwsem
){+.+.}-{4:4}
, at: sync_inodes_sb+0x19f/0xa10
1 lock held by khungtaskd/34:
 #0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
7 locks held by kworker/u10:5/4976:
2 locks held by getty/5675:
 #0: ffff88810dd8c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000290e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
2 locks held by syz.0.1/5919:
 #0: ffff88803a30e428 (sb_writers#12){.+.+}-{0:0}, at: vfs_coredump+0x1daa/0x2a50
 #1: 
ffff8881198f1b30
 (
&sb->s_type->i_mutex_key
#21
){++++}-{4:4}
, at: xfs_ilock+0xfe/0x390

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 4976 Comm: kworker/u10:5 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:io_serial_in+0x77/0xc0
Code: e8 8e e7 6f fc 44 89 f9 d3 e3 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 df 70 d3 fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f e9 1a 86 2d 06 cc 44 89 f9 80 e1 07
RSP: 0018:ffffc90004935bb8 EFLAGS: 00000006
RAX: 1ffffffff33bf105 RBX: 00000000000003f9 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffffc90004935d90 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffffff854fd580 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff99df8ac0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010f750000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 serial8250_console_write+0x584/0x1ba0
 console_flush_all+0x728/0xc40
 console_unlock+0xc4/0x270
 vprintk_emit+0x5b7/0x7a0
 _printk+0xcf/0x120
 print_hex_dump+0x1a8/0x260
 xfs_hex_dump+0x3d/0x50
 xfs_buf_verifier_error+0x1cc/0x2a0
 xfs_agf_read_verify+0x16e/0x1f0
 __xfs_buf_ioend+0x342/0x6f0
 xfs_buf_iowait+0x167/0x480
 xfs_buf_read_map+0x335/0xa50
 xfs_trans_read_buf_map+0x1d7/0x8e0
 xfs_read_agf+0x281/0x5c0
 xfs_alloc_read_agf+0x17c/0xb70
 xfs_bmapi_allocate+0x1426/0x2e00
 xfs_bmapi_convert_delalloc+0x7e2/0x1430
 xfs_writeback_range+0x674/0xf70
 iomap_writeback_folio+0xe75/0x1c80
 iomap_writepages+0x162/0x2d0
 xfs_vm_writepages+0x296/0x310
 do_writepages+0x32e/0x550
 __writeback_single_inode+0x145/0xff0
 writeback_sb_inodes+0x6c7/0x1010
 wb_writeback+0x43b/0xaf0
 wb_workfn+0x409/0xef0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
