INFO: task syz.4.145:7143 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.145       state:D stack:13048 pid:7143  tgid:7142  ppid:6879   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: 0033:0x7f60f678ebe9
RSP: 002b:00007f60f75cd038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f60f69c5fa0 RCX: 00007f60f678ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007f60f6811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f60f69c6038 R14: 00007f60f69c5fa0 R15: 00007ffe96b774a8
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u8:1/13:
 #0: ffff88810919f948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffff88804b024008 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
 #2: ffff88804b025918 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x1ae/0xf30
1 lock held by khungtaskd/34:
 #0: ffffffff8e139f20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5673:
 #0: ffff8880215fe0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
2 locks held by syz-executor/6618:
1 lock held by syz.4.145/7143:
 #0: ffff888119f100e0 (&type->s_umount_key#73){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
3 locks held by syz-executor/9767:
 #0: ffffffff8f538c48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8db/0x1c70
 #1: ffff888035444d30 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: do_setlink+0x388/0x41c0
 #2: ffffffff8e13f9b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
3 locks held by syz.9.465/9856:
2 locks held by syz.0.466/9874:

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

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+0x3fc/0x770
 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: 9874 Comm: syz.0.466 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:match_held_lock+0x15/0xc0
Code: 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 56 53 bb 01 00 00 00 48 39 77 10 74 6a 81 7f 20 00 00 20 00 <72> 5f 48 8b 46 08 48 85 c0 75 17 31 db 49 89 fe 48 89 f7 31 f6 e8
RSP: 0018:ffffc900001e0d70 EFLAGS: 00000083
RAX: 0000000000000005 RBX: 0000000000000001 RCX: 32bdd4fdcc55fc00
RDX: 0000000000000000 RSI: ffff888136639f98 RDI: ffff888109092800
RBP: 00000000ffffffff R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003c1b0 R12: 0000000000000046
R13: ffff888109091cc0 R14: ffff888136639f98 R15: 0000000000000002
FS:  00007fc1940116c0(0000) GS:ffff8881a3c18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc1931733e0 CR3: 000000012bd4c000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lock_is_held_type+0xa8/0x190
 ttwu_do_activate+0x93/0x870
 sched_ttwu_pending+0x2ce/0x6e0
 __flush_smp_call_function_queue+0x86d/0xaa0
 __sysvec_call_function_single+0xa8/0x3d0
 sysvec_call_function_single+0x9e/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:console_flush_all+0x7f7/0xc40
Code: 48 21 c3 0f 85 e9 01 00 00 e8 65 49 1f 00 48 8b 5c 24 20 4d 85 f6 75 07 e8 56 49 1f 00 eb 06 e8 4f 49 1f 00 fb 48 8b 44 24 28 <42> 80 3c 20 00 74 08 48 89 df e8 5a b7 82 00 48 8b 1b 48 8b 44 24
RSP: 0018:ffffc900036cf480 EFLAGS: 00000287
RAX: 1ffffffff1d3684f RBX: ffffffff8e9b4278 RCX: 0000000000080000
RDX: ffffc9002c403000 RSI: 0000000000005d04 RDI: 0000000000005d05
RBP: ffffc900036cf5d0 R08: ffffffff8fa39037 R09: 1ffffffff1f47206
R10: dffffc0000000000 R11: fffffbfff1f47207 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000200 R15: ffffffff8e9b4220
 console_unlock+0xc4/0x270
 vprintk_emit+0x5b7/0x7a0
 _printk+0xcf/0x120
 _btrfs_printk+0x562/0x5b0
 btrfs_init_csum_hash+0x327/0x3d0
 open_ctree+0xba7/0x3a10
 btrfs_get_tree+0xf55/0x1820
 vfs_get_tree+0x92/0x2b0
 do_new_mount+0x2a2/0x9e0
 __se_sys_mount+0x317/0x410
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc19319038a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc194010e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc194010ef0 RCX: 00007fc19319038a
RDX: 0000200000000000 RSI: 00002000000015c0 RDI: 00007fc194010eb0
RBP: 0000200000000000 R08: 00007fc194010ef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00002000000015c0
R13: 00007fc194010eb0 R14: 000000000000559e R15: 0000200000001600
 </TASK>
