INFO: task syz-executor:7951 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21960 pid:7951  tgid:7951  ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x87d/0x1080
 down_write+0x1bc/0x200
 deactivate_super+0xa9/0xe0
 cleanup_mnt+0x3d3/0x460
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0x1fa/0x730
 do_syscall_64+0x353/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a86f9e097
RSP: 002b:00007ffff8770cc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f5a870322ca RCX: 00007f5a86f9e097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffff8770d80
RBP: 00007ffff8770d80 R08: 00007ffff8771d80 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffff8771e10
R13: 00007f5a870322ca R14: 00000000000282fc R15: 00007ffff8771e50
 </TASK>
INFO: task syz.5.400:8700 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.400       state:D stack:27520 pid:8700  tgid:8698  ppid:8173   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 jfs_flush_journal+0x719/0xf50
 jfs_sync_fs+0x7d/0xa0
 dquot_quota_sync+0xd1/0x490
 __iterate_supers+0x137/0x240
 __se_sys_quotactl+0x3a0/0x9a0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe913b9ce59
RSP: 002b:00007fe914a5b028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fe913e16090 RCX: 00007fe913b9ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000101
RBP: 00007fe913c32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe913e16128 R14: 00007fe913e16090 R15: 00007fff093c18f8
 </TASK>
INFO: task syz.6.408:8760 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.408       state:D stack:24776 pid:8760  tgid:8759  ppid:6906   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6ba/0x920
 down_read+0x9c/0x330
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x120/0x240
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbd4c59ce59
RSP: 002b:00007fbd4d421028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fbd4c815fa0 RCX: 00007fbd4c59ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fbd4c815fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbd4c816038 R14: 00007fbd4c815fa0 R15: 00007ffefc232df8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e959c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5433:
 #0: ffff88816fbd20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
1 lock held by syz-executor/7951:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.5.400/8700:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.6.408/8760:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.419/9034:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.422/9160:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.422/9164:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.425/9177:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.425/9178:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.430/9330:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.430/9359:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.4.431/9527:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.4.431/9529:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.433/9570:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.434/9670:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.452/9813:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.452/9814:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.458/9830:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.6.461/9881:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.462/9943:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.462/9955:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.472/9981:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.479/10074:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.479/10075:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.483/10121:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.483/10123:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.4.487/10189:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.488/10227:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.488/10228:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.490/10279:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.490/10280:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.491/10323:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.491/10324:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.6.505/10517:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.6.505/10524:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.503/10552:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.503/10553:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.516/10578:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.516/10579:
 #0: ffff8881745b80d8 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2d6/0x3d0

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 0 Comm: swapper/0 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:pv_native_safe_halt+0xf/0x20
Code: 4c 74 02 e9 13 05 03 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d 53 2a 13 00 fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8e607de0 EFLAGS: 00000202
RAX: 0000000000247ad3 RBX: ffffffff819aa450 RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8dfe5ea1 RDI: ffffffff8c2ab880
RBP: ffffffff8e607eb8 R08: ffff8881210338db R09: 1ffff1102420671b
R10: dffffc0000000000 R11: ffffed102420671c R12: 0000000000000000
R13: 1ffffffff1cd1de8 R14: 1ffffffff1cc0fc4 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88818dc18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bf0c6487b8 CR3: 0000000113176000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 default_idle+0x9/0x20
 default_idle_call+0x72/0xb0
 do_idle+0x2e0/0x540
 cpu_startup_entry+0x43/0x60
 rest_init+0x2de/0x300
 start_kernel+0x392/0x3e0
 x86_64_start_reservations+0x24/0x30
 x86_64_start_kernel+0x137/0x1b0
 common_startup_64+0x13e/0x157
 </TASK>
