INFO: task syz-executor:6212 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:17320 pid:6212  tgid:6212  ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 wb_wait_for_completion+0x15f/0x260
 __writeback_inodes_sb_nr+0x1f6/0x250
 sync_filesystem+0xa3/0x230
 generic_shutdown_super+0x6f/0x2c0
 bch2_kill_sb+0x41/0x50
 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: 0033:0x7f27d1d8ff17
RSP: 002b:00007ffc7e3f5658 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f27d1e11c05 RCX: 00007f27d1d8ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc7e3f5710
RBP: 00007ffc7e3f5710 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc7e3f67a0
R13: 00007f27d1e11c05 R14: 000000000001ebab R15: 00007ffc7e3f67e0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/u10:2/40:
 #0: ffff888136639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
 #1: ffff888136624008 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
 #2: ffff88812ae10768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: cfg80211_wiphy_work+0xc4/0x470
2 locks held by kworker/u9:8/1095:
 #0: ffff88801d68e948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90007057bc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
4 locks held by kworker/u10:4/3147:
 #0: ffff88801a489148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900202bfbc0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f538888 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
 #3: ffffffff8e13f978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730
2 locks held by dhcpcd/5595:
 #0: ffff8880379fb6d0 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: __netlink_dump_start+0xfe/0x7e0
 #1: ffffffff8f538888 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x92/0x200
2 locks held by getty/5679:
 #0: ffff8881101090a0 (&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 sshd/5781:
6 locks held by kworker/1:3/5900:
 #0: ffff88801b37b548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90004b2fbc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff888023089198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20
 #3: ffff8881224e0198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
 #4: ffff888127a85160 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
 #5: ffff8881332c1370 (&dev->usbc_mutex){+.+.}-{4:4}, at: device_authorization+0x31/0xbf0
1 lock held by syz-executor/6212:
 #0: ffff88801e5260e0 (&type->s_umount_key#61){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz-executor/10220:
 #0: ffffffff8e13f978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
3 locks held by syz.9.697/10297:

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

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: 5781 Comm: sshd 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:vma_interval_tree_remove+0x56c/0x9a0
Code: 4c 89 ef e8 b6 99 1c 00 49 89 5d 00 45 31 ff 4d 85 f6 0f 85 90 02 00 00 e9 3a 02 00 00 e8 7c 2a b9 ff 49 89 dd e9 8d 00 00 00 <e8> 6f 2a b9 ff 41 80 3c 2f 00 74 08 4c 89 e7 e8 80 99 1c 00 4d 89
RSP: 0018:ffffc90002eff818 EFLAGS: 00000246
RAX: ffff888028e815b0 RBX: ffff88810b20b5b1 RCX: ffff88810f415640
RDX: 0000000000000000 RSI: ffff88810b20b5b0 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffff888114016f7f R09: 1ffff11022802def
R10: dffffc0000000000 R11: ffffffff8206a270 R12: ffff88810b20b5c0
R13: 0000000000000000 R14: ffff88810b20b5b0 R15: 1ffff110216416b8
FS:  0000000000000000(0000) GS:ffff8880b861b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe64ca2ff8 CR3: 000000000df36000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 unlink_file_vma_batch_process+0x231/0x340
 free_pgtables+0x7dc/0x9c0
 exit_mmap+0x444/0xb50
 __mmput+0x118/0x420
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x21f7/0x2200
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f46bc4fca90
Code: Unable to access opcode bytes at 0x7f46bc4fca66.
RSP: 002b:00007ffe64ca4458 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007ffe64ca45a8 RCX: 00007f46bc4fca90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 00000000000000ff
RBP: 00000000000000ff R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00005647f3b59c08
R13: 00005647f3b5a208 R14: 00007f46bc8d3698 R15: 000056482fa0b150
 </TASK>
