INFO: task kworker/u10:4:83 blocked for more than 149 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u10:4   state:D stack:23360 pid:83    tgid:83    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: writeback wb_workfn (flush-7:0)
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7f5/0x1550
 hfsplus_find_init+0x168/0x2d0
 hfsplus_cat_write_inode+0x22e/0x9c0
 __writeback_single_inode+0x75a/0x10e0
 writeback_sb_inodes+0x979/0x19d0
 __writeback_inodes_wb+0x111/0x240
 wb_writeback+0x459/0xb00
 wb_workfn+0xb12/0xf10
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 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 khungtaskd/34:
 #0: ffffffff8e95cce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
4 locks held by kworker/u10:4/83:
 #0: ffff888162a82140 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc9000279fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffff88801f7660d8 (&type->s_umount_key#52){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff888176e220a8 (&tree->tree_lock){+.+.}-{4:4}, at: hfsplus_find_init+0x168/0x2d0
2 locks held by getty/5653:
 #0: ffff8881105ba0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
4 locks held by syz.0.263/6859:
7 locks held by kworker/u8:5/7834:
 #0: ffff8881012b5940 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc900040a7c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffffffff8fdd3a88 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800
 #3: ffff8881ae5e2128 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x129/0x420
 #4: ffff8881ae5e1258 (&devlink->lock_key#6){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x142/0x420
 #5: ffffffff8fde2380 (rtnl_mutex){+.+.}-{4:4}, at: nsim_destroy+0x13a/0x830
 #6: ffffffff8e962fe8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by syz.9.740/9423:
 #0: ffffffff8fde2380 (rtnl_mutex){+.+.}-{4:4}, at: dev_ioctl+0x83c/0x1150
1 lock held by syz-executor/9431:

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

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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd3/0x1030
 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: 6859 Comm: syz.0.263 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:rcu_is_watching+0x5e/0xb0
Code: 03 42 80 3c 38 00 74 08 4c 89 f7 e8 fc 1b 86 00 48 c7 c3 d8 89 41 93 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 34 <8b> 03 65 ff 0d 89 6b 95 11 74 11 83 e0 04 c1 e8 02 5b 41 5e 41 5f
RSP: 0018:ffffc90000007738 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8881210339d8 RCX: 0000000000000103
RDX: ffffc90000007801 RSI: ffffffff8c289f40 RDI: ffffffff8c289f00
RBP: dffffc0000000000 R08: ffffc90003497a20 R09: 0000000000000000
R10: ffffc90000007878 R11: fffff52000000f11 R12: ffffc90003497a30
R13: ffffc90003490000 R14: ffffffff8e297790 R15: dffffc0000000000
FS:  00007f373be3f6c0(0000) GS:ffff88818dc1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff5995dff8 CR3: 00000001b6428000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 unwind_next_frame+0x1b76/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 insert_work+0x3d/0x330
 __queue_work+0xbad/0xfc0
 call_timer_fn+0x192/0x5e0
 __run_timer_base+0x67e/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x22a/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:vprintk_emit+0x45d/0x560
Code: 0f 84 44 ff ff ff e8 42 1c 21 00 fb eb 44 e8 3a 1c 21 00 e8 e5 21 13 0a 4d 85 f6 74 94 e8 2b 1c 21 00 fb 48 c7 c7 20 f1 94 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 1b 18
RSP: 0018:ffffc90003496ec0 EFLAGS: 00000293
RAX: ffffffff81a4a345 RBX: ffffffff81a4a1bf RCX: ffff88810c151d80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e94f120
RBP: ffffc90003496f70 R08: ffffffff903366f7 R09: 1ffffffff2066cde
R10: dffffc0000000000 R11: fffffbfff2066cdf R12: 0000000000000000
R13: 0000000000000065 R14: 0000000000000200 R15: 1ffff92000692ddc
 _printk+0xdd/0x130
 hfsplus_bnode_dump+0x189/0xa40
 hfsplus_brec_remove+0x617/0x700
 __hfsplus_delete_attr+0x1e0/0x420
 hfsplus_replace_attr+0x1ff/0x3d0
 __hfsplus_setxattr+0x4bf/0x2860
 hfsplus_setxattr+0x124/0x340
 hfsplus_trusted_setxattr+0x40/0x60
 __vfs_setxattr+0x43c/0x480
 __vfs_setxattr_noperm+0x12d/0x660
 vfs_setxattr+0x163/0x360
 filename_setxattr+0x296/0x630
 path_setxattrat+0x3eb/0x440
 __x64_sys_lsetxattr+0xbf/0xe0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f373af9c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f373be3f028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007f373b216090 RCX: 00007f373af9c819
RDX: 0000200000000940 RSI: 0000200000000840 RDI: 0000200000000000
RBP: 00007f373b032c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000361 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f373b216128 R14: 00007f373b216090 R15: 00007fff3ce8dd48
 </TASK>
