INFO: task syz.4.952:11214 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.952       state:D stack:24648 pid:11214 tgid:11213 ppid:9030   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
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x4da/0x950
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9ab9f8ebe9
RSP: 002b:00007f9ab81f6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f9aba1c5fa0 RCX: 00007f9ab9f8ebe9
RDX: 0000000000000000 RSI: 0000200000000000 RDI: ffffffff80000801
RBP: 00007f9aba011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9aba1c6038 R14: 00007f9aba1c5fa0 R15: 00007ffdc31c75b8
 </TASK>

Showing all locks held in the system:
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/5677:
 #0: ffff88801c3150a0 (&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/6723:
 #0: ffff88803f3000e0 (&type->s_umount_key#55){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff888129200278 (&c->state_lock){++++}-{4:4}, at: __bch2_fs_stop+0xf8/0x900
6 locks held by kworker/0:9/8630:
 #0: ffff88801bb57548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900031cfbc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: 
ffff88810a7f7198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20
 #3: ffff88810a8a2518 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x21b8/0x4a20
 #4: 
ffff88810a828d68 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_event+0x21e5/0x4a20
 #5: ffffffff8ede0950 (ehci_cf_port_reset_rwsem){.+.+}-{4:4}, at: hub_port_reset+0x163/0x1750
1 lock held by syz.4.952/11214:
 #0: ffff88803f3000e0 (&type->s_umount_key#55){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
2 locks held by kworker/u9:0/12678:
 #0: ffff88801a489148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000600fbc0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
2 locks held by syz.2.1426/13405:
 #0: ffff88810dec6298 (&net->xfrm.xfrm_cfg_mutex){+.+.}-{4:4}, at: pfkey_sendmsg+0x42f/0x1090
 #1: ffffffff8f666028 (pfkey_mutex){+.+.}-{4:4}, at: pfkey_register+0x10e/0x890
2 locks held by syz.2.1426/13407:
1 lock held by modprobe/13441:

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

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: 13407 Comm: syz.2.1426 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:number+0xad0/0xf60
Code: d9 80 e1 07 38 c1 0f 8c 7b ff ff ff 48 89 df e8 16 0e ad f6 e9 6e ff ff ff e8 8c 9f 49 f6 4d 01 e6 49 83 c6 04 b8 ff ff ff ff <48> 89 44 24 18 8b 5c 24 3c 89 df 4c 8b 7c 24 50 44 89 fe e8 28 a1
RSP: 0018:ffffc9000636ecc0 EFLAGS: 00000246
RAX: 00000000fffffffe RBX: 00000000ffffffff RCX: 0000000000080000
RDX: ffffc90008bf9000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000636ede0 R08: ffffc9000636ed57 R09: 0000000000000000
R10: ffffc9000636ed40 R11: fffff52000c6ddab R12: 00000000fffffffe
R13: 0000000000000003 R14: ffffc9000636f0c3 R15: 00000000ffff0a00
FS:  00007f39b42426c0(0000) GS:ffff8881a3c18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c64654f6f0 CR3: 000000003ed36000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 vsnprintf+0x91b/0xf00
 sprintf+0xd9/0x120
 info_print_prefix+0x155/0x310
 record_print_text+0x154/0x420
 printk_get_next_message+0x26d/0x7b0
 console_flush_all+0x4ca/0xc40
 console_unlock+0xc4/0x270
 vprintk_emit+0x5b7/0x7a0
 __bch2_print+0x176/0x220
 bch2_fs_start+0xb6d/0xda0
 bch2_fs_get_tree+0xb39/0x1520
 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: 0033:0x7f39b339038a
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:00007f39b4241e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f39b4241ef0 RCX: 00007f39b339038a
RDX: 0000200000000200 RSI: 0000200000000000 RDI: 00007f39b4241eb0
RBP: 0000200000000200 R08: 00007f39b4241ef0 R09: 0000000001800406
R10: 0000000001800406 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f39b4241eb0 R14: 000000000000598f R15: 0000200000000040
 </TASK>
