INFO: task syz.2.43:6231 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.43        state:D stack:28832 pid:6231  tgid:6214  ppid:5810   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x899/0x1040
 down_write_nested+0x1c6/0x210
 filename_create+0x200/0x370
 filename_mkdirat+0xd2/0x510
 __se_sys_mkdirat+0x35/0x150
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b7659b607
RSP: 002b:00007f4b774fee58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f4b774feee0 RCX: 00007f4b7659b607
RDX: 00000000000001ff RSI: 0000200000000100 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000200000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000100
R13: 00007f4b774feea0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e75e420 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
4 locks held by kworker/u10:4/85:
 #0: ffff8881622cf148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9ea/0x1830
 #1: ffffc900028bfc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa25/0x1830
 #2: ffff8881bb9ac0e0 (&type->s_umount_key#53){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff8881bb309d40 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530
2 locks held by getty/5634:
 #0: ffff88816fe9e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
3 locks held by kworker/1:7/5876:
 #0: ffff88810006b148 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9ea/0x1830
 #1: ffffc900063a7c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa25/0x1830
 #2: ffff88816826b240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x202/0x3d0
4 locks held by syz.2.43/6215:
2 locks held by syz.2.43/6231:
 #0: ffff8881bb9ac420 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881bb30a0f0 (&type->i_mutex_dir_key#9/1){+.+.}-{4:4}, at: filename_create+0x200/0x370
3 locks held by syz.2.496/9810:
3 locks held by dhcpcd-run-hook/9824:

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

NMI backtrace for cpu 0
CPU: 0 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/0x300
 sys_info+0x135/0x170
 watchdog+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9824 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:__lock_acquire+0x2a1/0x2cf0
Code: 01 00 00 4c 8b 84 24 28 01 00 00 4c 8b 74 24 08 4d 8d be 58 0b 00 00 83 fd 31 48 89 74 24 18 0f 83 14 28 00 00 48 89 6c 24 28 <48> 8d 04 ad 00 00 00 00 48 01 e8 89 f1 81 e1 ff 1f 00 00 ba 00 e0
RSP: 0000:ffffc90007d3f698 EFLAGS: 00000087
RAX: 00000000000000af RBX: 0000000000000000 RCX: ffffffff93c4a410
RDX: 0000000000000005 RSI: 0000000000000007 RDI: 0000000000000000
RBP: 0000000000000005 R08: ffffffff823c1f78 R09: ffffffff8e75e420
R10: dffffc0000000000 R11: fffff94000dff231 R12: 0000000000000000
R13: 0000000000000002 R14: ffff88816cb7ba80 R15: ffff88816cb7c5d8
FS:  00007fdeb6445380(0000) GS:ffff8882a9463000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdeb6581059 CR3: 00000001b4444000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_acquire+0xf0/0x2e0
 page_table_check_set+0x165/0x610
 set_pte_range+0x84b/0x8a0
 filemap_map_pages+0xff2/0x2050
 do_pte_missing+0x211a/0x3490
 handle_mm_fault+0x1bec/0x3310
 do_user_addr_fault+0xa73/0x1340
 exc_page_fault+0x6a/0xc0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7fdeb6581059
Code: b5 40 ff ff ff 48 89 e7 e8 5d 85 01 00 64 44 89 33 48 8d 65 d8 48 98 5b 41 5c 48 c1 f8 3f 41 5d 41 5e 48 83 c8 01 41 5f 5d c3 <41> 55 41 54 55 89 fd 53 8d 85 47 ff ff ff 48 83 ec 38 83 f8 0e 77
RSP: 002b:00007ffdbcc76428 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00007fdeb64be4f8 RCX: 0000000000000002
RDX: 00007ffdbcc76528 RSI: 00007ffdbcc76508 RDI: 000000000000001e
RBP: 00007fdeb64be4f0 R08: 0000000000000000 R09: 000000000000000d
R10: 00007ffdbcc76140 R11: 0000000000000246 R12: 0000000000000003
R13: 00007ffdbcc76508 R14: 00007ffdbcc76528 R15: 0000000000000000
 </TASK>
