INFO: task syz.1.189:7485 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.189       state:D stack:25128 pid:7485  tgid:7484  ppid:7055   task_flags:0x400040 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: 0033:0x7f2d67b8ebe9
RSP: 002b:00007f2d68a60038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f2d67dc5fa0 RCX: 00007f2d67b8ebe9
RDX: 000000000000ee01 RSI: 0000200000000240 RDI: ffffffff80000800
RBP: 00007f2d67c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000080 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2d67dc6038 R14: 00007f2d67dc5fa0 R15: 00007ffed1a12838
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139f60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/0:2/791:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffff88804b024008 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
 #2: ffff888030d55240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x26b/0x3180
2 locks held by getty/5676:
 #0: ffff888107de90a0 (&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
3 locks held by syz-executor/5851:
2 locks held by syz-executor/5854:
2 locks held by syz-executor/5988:
3 locks held by syz-executor/6319:
3 locks held by syz-executor/6490:
1 lock held by syz.1.189/7485:
 #0: ffff88802282a0e0 (&type->s_umount_key#70){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.2.214/7748:
 #0: ffff888122ec80e0 (&type->s_umount_key#70){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
2 locks held by syz.9.391/8800:
 #0: ffffffff8e88e608 (bio_slab_lock){+.+.}-{4:4}, at: bioset_exit+0x44a/0x690
 #1: ffffffff8e13f8c0 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570
3 locks held by syz.3.394/8804:
1 lock held by cmp/8821:

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

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+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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8822 Comm: rm 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:__sanitizer_cov_trace_pc+0x11/0x70
Code: 5b e9 43 9d 58 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 80 a0 92 <65> 8b 15 18 d1 e0 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc90002f9f7b8 EFLAGS: 00000246
RAX: ffffffff822e42aa RBX: ffffea0001059000 RCX: ffff8880215ad640
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 1ffffffff1b7b08f R08: ffff8880223651df R09: 1ffff1100446ca3b
R10: dffffc0000000000 R11: ffffed100446ca3c R12: fffa800041648000
R13: ffffea0001059000 R14: dffffc0000000000 R15: dead000000000100
FS:  0000000000000000(0000) GS:ffff8880b8618000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffc0fa4ff8 CR3: 0000000045170000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __page_table_check_zero+0x6a/0x530
 post_alloc_hook+0x253/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x370
 ___slab_alloc+0xbeb/0x1410
 kmem_cache_alloc_noprof+0x283/0x3c0
 getname_flags+0xb8/0x540
 do_sys_openat2+0xbc/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1a8bedfa46
Code: 10 00 00 00 44 8b 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 44 89 c2 4c 89 ce bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 0c f7 d8 89 05 0a 48 01 00 48 83 c8 ff c3 31
RSP: 002b:00007fffc0fa45d8 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fffc0fa4838 RCX: 00007f1a8bedfa46
RDX: 0000000000080000 RSI: 00007fffc0fa4650 RDI: 00000000ffffff9c
RBP: 00007fffc0fa4640 R08: 0000000000080000 R09: 00007fffc0fa4650
R10: 0000000000000000 R11: 0000000000000287 R12: 00007fffc0fa4650
R13: 0000000000000002 R14: 00007fffc0fa481f R15: 00000000ffffffff
 </TASK>
