INFO: task kworker/u10:5:1105 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u10:5   state:D stack:23848 pid:1105  tgid:1105  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: writeback wb_workfn (flush-7:6)
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 hfsplus_write_inode+0x505/0x700
 __writeback_single_inode+0x6ac/0xf90
 writeback_sb_inodes+0x9de/0x1b00
 __writeback_inodes_wb+0x114/0x240
 wb_writeback+0x42f/0xad0
 wb_workfn+0xc92/0x10f0
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
 #0: ffffffff8eb5ff68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
2 locks held by kworker/0:1/10:
1 lock held by khungtaskd/35:
 #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
4 locks held by kworker/u10:5/1105:
 #0: ffff88816269f140 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90006f87c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffff88810e0640d8 (&type->s_umount_key#61){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff8881704440a8 (&tree->tree_lock){+.+.}-{4:4}, at: hfsplus_write_inode+0x505/0x700
2 locks held by getty/5425:
 #0: ffff8881711610a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034832e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
7 locks held by syz.6.1985/10911:
2 locks held by syz.9.3195/14685:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 14685 Comm: syz.9.3195 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
RIP: 0010:_raw_spin_lock+0xd/0x40
Code: e8 5b 41 5e 5d e9 c3 4a 00 00 cc 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 53 48 89 fb bf 01 00 00 00 <e8> 3e 1e c2 f5 48 8d 7b 18 31 f6 31 d2 31 c9 41 b8 01 00 00 00 45
RSP: 0018:ffffc90007557af0 EFLAGS: 00000246
RAX: 1ffff92000eaaf70 RBX: ffff88811587cc30 RCX: 0000000000080000
RDX: ffffc90021406000 RSI: 000000000007ffff RDI: 0000000000000001
RBP: ffffc90007557c20 R08: ffff88810b628000 R09: 0000000000000002
R10: 0000000000000406 R11: 0000000000000002 R12: ffffc90007557c30
R13: 1ffff92000eaaf68 R14: dffffc0000000000 R15: 1ffff110219a1827
FS:  00007f2f85e8b6c0(0000) GS:ffff88818d95c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe7c21eb7c0 CR3: 00000001053b0000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 xfs_ail_push_all_sync+0x107/0x290
 xfs_reclaim_inodes+0x193/0x2b0
 xfs_unmount_flush_inodes+0xb1/0xd0
 xfs_unmountfs+0x152/0x310
 xfs_fs_put_super+0x65/0x160
 generic_shutdown_super+0x13d/0x2d0
 kill_block_super+0x44/0x90
 xfs_kill_sb+0x15/0x50
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x3d3/0x460
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0x1fa/0x730
 do_syscall_64+0x353/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2f84f9f34a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2f85e8ae58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffec RBX: 00007f2f85e8aee0 RCX: 00007f2f84f9f34a
RDX: 0000200000009700 RSI: 0000200000009740 RDI: 00007f2f85e8aea0
RBP: 0000200000009700 R08: 00007f2f85e8aee0 R09: 0000000004000013
R10: 0000000004000013 R11: 0000000000000246 R12: 0000200000009740
R13: 00007f2f85e8aea0 R14: 000000000000975c R15: 00002000000000c0
 </TASK>
