INFO: task syz-executor:6785 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:22728 pid:6785  tgid:6785  ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17db/0x58f0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7c1/0x1550
 lmLogClose+0xad/0x530
 jfs_umount+0x2da/0x3b0
 jfs_put_super+0x8c/0x190
 generic_shutdown_super+0x13d/0x2d0
 kill_block_super+0x44/0xa0
 deactivate_locked_super+0xbc/0x110
 cleanup_mnt+0x3d3/0x460
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0x204/0x770
 do_syscall_64+0x328/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa3fb19f397
RSP: 002b:00007ffce58719f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fa3fb2344bb RCX: 00007fa3fb19f397
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffce5871ab0
RBP: 00007ffce5871ab0 R08: 00007ffce5872ab0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffce5872b40
R13: 00007fa3fb2344bb R14: 000000000001af49 R15: 00007ffce5872b80
 </TASK>

Showing all locks held in the system:
locks held by rcu_exp_gp_kthr/19: 1, last CPU#0:
 #0: ffff88812103bb20 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2d/0x160
locks held by khungtaskd/34: 1, last CPU#1:
 #0: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
locks held by getty/5417: 2, on CPU#0:
 #0: ffff8881604990a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034832e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
locks held by sshd/5579: 1, last CPU#0:
 #0: ffff888170553a08 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500
locks held by syz-executor/5590: 2, on CPU#1:
 #0: ffff888114f940e8 (&type->s_umount_key#71){++++}-{4:4}, at: deactivate_super+0xac/0xe0
 #1: ffffffff8f213660 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xad/0x530
locks held by syz-executor/6785: 2, on CPU#1:
 #0: ffff888172ff20e8 (&type->s_umount_key#71){++++}-{4:4}, at: deactivate_super+0xac/0xe0
 #1: ffffffff8f213660 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xad/0x530
locks held by syz.9.507/8229: 1, on CPU#1:
 #0: ffff888114f940e8 (&type->s_umount_key#71){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
locks held by syz.5.518/8271: 1, on CPU#1:
 #0: ffff888114f940e8 (&type->s_umount_key#71){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
locks held by syz-executor/8291: 2, on CPU#0:
 #0: ffff88816abb40e8 (&type->s_umount_key#71){++++}-{4:4}, at: deactivate_super+0xac/0xe0
 #1: ffffffff8f213660 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xad/0x530
locks held by kworker/u8:8/9985: 7, last CPU#0:
 #0: ffff8881012d5940 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc900046dfc40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff90242488 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf5/0x810
 #3: ffffffff90250d00 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x28e/0x8d0
 #4: ffff8881012d42a0 (&root->kernfs_supers_rwsem){++++}-{4:4}, at: kernfs_remove_by_name_ns+0x3f/0x140
 #5: ffff8881012d4180 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_remove_by_name_ns+0x4e/0x140
 #6: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: kernfs_root+0x1c/0x230
locks held by syz-executor/10522: 2, last CPU#1:
 #0: ffff8881172ee9b8 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x1a4/0x9f0
 #1: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240
locks held by syz-executor/10525: 1, on CPU#0:
 #0: ffffffff8ed62aa8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
locks held by syz-executor/11496: 2, on CPU#0:
 #0: ffff888117ad80e8 (&type->s_umount_key#71){++++}-{4:4}, at: deactivate_super+0xac/0xe0
 #1: ffffffff8f213660 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xad/0x530
locks held by syz.6.1286/11886: 1, on CPU#0:
 #0: ffff888172ff20e8 (&type->s_umount_key#71){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
locks held by syz-executor/12094: 1, on CPU#0:
 #0: ffffffff90250d00 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xc10/0x1c30

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

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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17d/0x390
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x38b/0x480
 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: 5024 Comm: syslogd 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:mutex_lock_nested+0xa/0x20
Code: e8 bb 42 52 f6 eb 99 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 89 f2 4c 8b 04 24 <be> 02 00 00 00 31 c9 eb 1d 66 66 66 66 2e 0f 1f 84 00 00 00 00 00
RSP: 0018:ffffc900031af9b8 EFLAGS: 00000246
RAX: ffffffff8a853019 RBX: ffffc900031afad0 RCX: ffff88816b3c1e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888114b0c990
RBP: ffffc900031afb30 R08: ffffffff8a852f63 R09: 1ffffffff20f424f
R10: dffffc0000000000 R11: fffffbfff20f4250 R12: ffff888114b0c400
R13: ffffc900031afac0 R14: ffff888114b0c4e8 R15: ffff888114b0c400
FS:  00007f1923a0a380(0000) GS:ffff88818d6da000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdcd651b000 CR3: 0000000114a0e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __unix_dgram_recvmsg+0x1e3/0xd70
 sock_recvmsg+0x196/0x1e0
 sock_read_iter+0x22a/0x2f0
 vfs_read+0x595/0xa80
 ksys_read+0x150/0x270
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1923b5eb6a
Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffd92c68708 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f1923b5eb6a
RDX: 00000000000000ff RSI: 000055fd7b878950 RDI: 0000000000000000
RBP: 000055fd7b878910 R08: 0000000000004001 R09: 0000000000000000
R10: 000055fd7b878f00 R11: 0000000000000246 R12: 000055fd7b8789ae
R13: 000055fd7b878950 R14: 0000000000000000 R15: 00007f1923d43a80
 </TASK>
