INFO: task syz.9.3083:18312 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.3083      state:D stack:24184 pid:18312 tgid:18311 ppid:16497  task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 __iterate_supers+0x126/0x290
 __se_sys_quotactl+0x353/0x950
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f42ea98ec29
RSP: 002b:00007f42eb844038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f42eabd5fa0 RCX: 00007f42ea98ec29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007f42eaa11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f42eabd6038 R14: 00007f42eabd5fa0 R15: 00007ffec19d7698
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5676:
 #0: ffff88813652e8a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc90000fe82f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
3 locks held by kworker/0:4/5849:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90003247bc0 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f813f48 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_global_led_trigger_worker+0x27/0xd0
4 locks held by kworker/0:6/5918:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900035a7bc0 ((rfkill_op_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f813f48 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_epo+0x4c/0x180
 #3: ffff88811d988dc0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_rfkill_set_block+0x179/0x2e0
2 locks held by syz-executor/13812:
1 lock held by syz.9.3083/18312:
 #0: ffff888110d9c0e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
2 locks held by syz.5.3573/20413:
2 locks held by syz.0.3574/20423:

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

NMI backtrace for cpu 0
CPU: 0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7960 Comm: kworker/1:5 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: xfs-conv/loop0 xfs_end_io
RIP: 0010:__lock_acquire+0x41d/0xd20
Code: 90 90 90 31 c9 48 8b 3c 24 84 db 0f 84 e3 01 00 00 41 8b 46 20 66 85 c0 0f 88 d6 01 00 00 0f b6 89 c5 00 00 00 84 c9 0f b6 d3 <44> 0f b6 e9 44 0f 44 ea 44 8b a7 e8 0a 00 00 41 8d 4c 24 ff 83 f9
RSP: 0018:ffffc90003027028 EFLAGS: 00000002
RAX: 0000000000020007 RBX: 0000000000000003 RCX: 0000000000000001
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffff888105ae8000
RBP: 0000000000000007 R08: 0000000000000000 R09: ffffffff8172c195
R10: ffffc90003027278 R11: ffffffff81ac3b00 R12: 0000000000020000
R13: 0000000000000000 R14: ffff888105ae8b68 R15: ffff888105ae8af0
FS:  0000000000000000(0000) GS:ffff8881a3c12000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555570808608 CR3: 0000000040962000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_acquire+0x120/0x360
 unwind_next_frame+0xc2/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kmem_cache_free+0x18f/0x400
 __xfs_trans_commit+0x3e0/0xbd0
 xfs_trans_commit+0x13e/0x1c0
 xfs_iomap_write_unwritten+0x554/0xa70
 xfs_end_ioend+0x31f/0x690
 xfs_end_io+0x253/0x2d0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
