INFO: task syz.2.1391:11691 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.1391      state:D stack:25128 pid:11691 tgid:11690 ppid:10636  task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x872/0xfe0
 down_write+0x1ab/0x1f0
 super_lock+0x25c/0x3b0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x4da/0x950
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f687bf8ec29
RSP: 002b:00007f687ce25038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f687c1d5fa0 RCX: 00007f687bf8ec29
RDX: 0000000000000000 RSI: 0000200000000140 RDI: ffffffff80000301
RBP: 00007f687c011e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f687c1d6038 R14: 00007f687c1d5fa0 R15: 00007ffd0ac64498
 </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
3 locks held by kworker/1:2/794:
2 locks held by getty/5680:
 #0: ffff8880285d60a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029032f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
2 locks held by syz-executor/5862:
1 lock held by syz.2.1391/11691:
 #0: ffff88803c4740e0 (&type->s_umount_key#77){+.+.}-{4:4}, at: super_lock+0x25c/0x3b0
1 lock held by syz-executor/13796:
 #0: ffff888136639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
1 lock held by syz.8.1913/14623:

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

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: 5838 Comm: syz-executor 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:__free_object+0x135/0x6d0
Code: 65 8b 05 1e 2d d0 0d 85 c0 75 0f 65 8b 05 db 29 d0 0d 85 c0 0f 85 35 04 00 00 49 8d 5e 08 48 89 d8 48 c1 e8 03 48 89 44 24 20 <42> 0f b6 04 28 84 c0 0f 85 60 04 00 00 48 89 5c 24 28 f6 03 0f 4c
RSP: 0018:ffffc9000329fb80 EFLAGS: 00000806
RAX: 1ffff11026cc7739 RBX: ffff88813663b9c8 RCX: e5e5c0e03c840100
RDX: 0000000000000000 RSI: ffffffff8be33f60 RDI: ffffffff8be33f20
RBP: ffffc9000329fc70 R08: ffffffff8fa3a737 R09: 1ffffffff1f474e6
R10: dffffc0000000000 R11: fffffbfff1f474e7 R12: 1ffff110230a4839
R13: dffffc0000000000 R14: ffff88813663b9c0 R15: ffff8881185241c0
FS:  0000555585976500(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055559278d608 CR3: 000000010fea2000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 debug_object_free+0x2a2/0x340
 hrtimer_nanosleep+0x2a6/0x360
 __se_sys_clock_nanosleep+0x2f1/0x380
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbff29c14a3
Code: 1f 84 00 00 00 00 00 83 ff 03 74 7b 83 ff 02 b8 fa ff ff ff 49 89 ca 0f 44 f8 80 3d be 70 1e 00 00 74 14 b8 e6 00 00 00 0f 05 <f7> d8 c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec 28 48 89 54 24 10
RSP: 002b:00007fff60c89fc8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbff29c14a3
RDX: 00007fff60c89fe0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 000000001d9f96a8 R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff60c8a430
R13: 0000000000000004 R14: 00007fff60c8a01c R15: 00007fff60c8a0b0
 </TASK>
