INFO: task syz-executor:9494 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:21456 pid:9494  tgid:9494  ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 lmLogClose+0xb4/0x520
 jfs_umount+0x2ef/0x3c0
 jfs_put_super+0x8c/0x190
 generic_shutdown_super+0x135/0x2c0
 kill_block_super+0x44/0x90
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f442eb8ff57
RSP: 002b:00007ffc37b913d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f442ec11c2d RCX: 00007f442eb8ff57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc37b91490
RBP: 00007ffc37b91490 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc37b92520
R13: 00007f442ec11c2d R14: 000000000003a149 R15: 00007ffc37b92560
 </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
2 locks held by kworker/u9:9/1137:
 #0: ffff88801f259948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900071b7bc0 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
2 locks held by getty/5676:
 #0: ffff888021f780a0 (&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
1 lock held by syz.4.591/8529:
 #0: ffff888106bb00e0 (&type->s_umount_key#49){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
3 locks held by kworker/0:6/8598:
 #0: ffff8881050a7948 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90002c57bc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff888108f38198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20
2 locks held by syz-executor/8687:
 #0: ffff888106bb00e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8e56ede8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
2 locks held by syz-executor/8954:
 #0: ffff88803b1360e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8e56ede8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
2 locks held by syz-executor/8999:
 #0: ffff88803f87c0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8e56ede8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
2 locks held by syz-executor/9053:
 #0: ffff8880351120e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8e56ede8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
2 locks held by syz-executor/9494:
 #0: ffff88803512a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8e56ede8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
2 locks held by kworker/u10:11/10435:
 #0: ffff88801f259948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90003edfbc0 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
2 locks held by kworker/u10:14/10438:
 #0: ffff88801f259948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900044c7bc0 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
1 lock held by syz.9.1238/11159:
 #0: ffff888106bb00e0 (&type->s_umount_key#49){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.9.1238/11160:
 #0: ffff888106bb00e0 (&type->s_umount_key#49){++++}-{4:4}, at: super_lock+0x25c/0x3b0
1 lock held by syz.9.1238/11163:
 #0: ffff888106bb00e0 (&type->s_umount_key#49){++++}-{4:4}, at: super_lock+0x25c/0x3b0
1 lock held by syz.1.1426/11763:
 #0: ffff88803f87c0e0 (&type->s_umount_key#49){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.0.1601/12356:
 #0: ffff8880351120e0 (&type->s_umount_key#49){++++}-{4:4}, at: super_lock+0x25c/0x3b0

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

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+0x439/0x7d0
 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: 38 Comm: kcompactd0 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:unwind_next_frame+0x36/0x2390
Code: 54 53 48 81 ec 98 00 00 00 49 89 fe 48 bd 00 00 00 00 00 fc ff df 48 8d 5f 48 48 89 d8 48 c1 e8 03 48 89 44 24 30 80 3c 28 00 <74> 08 48 89 df e8 d0 69 b0 00 48 89 5c 24 18 49 8b 5e 48 4d 8d 6e
RSP: 0018:ffffc900006cebd8 EFLAGS: 00000246
RAX: 1ffff920000d9d9e RBX: ffffc900006cecf0 RCX: e24b68ed1ade5700
RDX: dffffc0000000000 RSI: ffffffff82065c37 RDI: ffffc900006ceca8
RBP: dffffc0000000000 R08: ffffc900006ced70 R09: 0000000000000001
R10: ffffc900006cecf8 R11: ffffffff81ac3b00 R12: ffff88801b310000
R13: 1ffff920000d9dc0 R14: ffffc900006ceca8 R15: ffffc900006ceca8
FS:  0000000000000000(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000232fe000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 save_stack+0xf5/0x1f0
 __reset_page_owner+0x71/0x1f0
 free_pages_prepare+0x86c/0x9b0
 compaction_free+0x147/0x3e0
 migrate_pages_batch+0x2fc8/0x35c0
 migrate_pages+0x2038/0x2930
 compact_zone+0x23e1/0x4ab0
 compact_node+0x1d2/0x280
 kcompactd+0xbc8/0x1290
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
