INFO: task syz.2.1137:10687 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.1137      state:D stack:26176 pid:10687 tgid:10682 ppid:5596   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
  307.314502][   T37]
 __schedule+0x17db/0x58f0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x87d/0x1080
 down_write+0x1bc/0x200
 fuse_file_fallocate+0x2d8/0x8a0
 vfs_fallocate+0x65a/0x7e0
 madvise_vma_behavior+0x2fc2/0x4cb0
 madvise_walk_vmas+0x57d/0xb70
 madvise_do_behavior+0x385/0x540
 do_madvise+0x327/0x3a0
 __x64_sys_madvise+0xa6/0xc0
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f708119f559
RSP: 002b:00007f708212a028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f7081426090 RCX: 00007f708119f559
RDX: 0000000000000009 RSI: 0000000000600002 RDI: 0000200000000000
RBP: 00007f7081236b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7081426128 R14: 00007f7081426090 R15: 00007ffcd15dd688
 </TASK>

Showing all locks held in the system:
locks held by kworker/u10:0/30: 3, on CPU#1:
 #0: ffff8881000ac140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90000a57c40 ((work_completion)(&pool->idle_cull_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffff88823c63bd60 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2d/0x160
locks held by kworker/1:1/35: 3, on CPU#1:
 #0: ffff888106a90140 ((wq_completion)md_misc){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90000aa7c40 ((work_completion)(&mddev->sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffff88817861c0a0 (&mddev->suspend_mutex){+.+.}-{4:4}, at: mddev_suspend+0x139/0x6f0
locks held by khungtaskd/37: 1, last CPU#0:
 #0: ffffffff8fd5c8e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
locks held by kworker/u9:2/56: 5, last CPU#0:
 #0: ffff8881000ac140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc9000142fc40 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff8fbe99b0 (cpu_hotplug_lock){++++}-{0:0}, at: static_key_disable+0x12/0x20
 #3: ffffffff8fe389e0 (jump_label_mutex){+.+.}-{4:4}, at: static_key_disable_cpuslocked+0x8d/0x1a0
 #4: ffffffff8fbff760 (text_mutex){+.+.}-{4:4}, at: arch_jump_label_transform_apply+0x17/0x30
locks held by kworker/0:3/5008: 1, last CPU#0:
 #0: ffffffff8fd5c8e0 (rcu_read_lock){....}-{1:3}, at: process_scheduled_works+0x97a/0x1630
locks held by getty/5421: 2, on CPU#1:
 #0: ffff88810f0140a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000348b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
locks held by sshd/5523: 2, last CPU#0:
 #0: ffff88816fc26b08 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500
 #1: ffffffff8fd5c8e0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240
locks held by syz.2.1137/10683: 4, last CPU#0:
 #0: ffff8881bdcc64f0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff888110b8e460 (sb_writers#16){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #2: ffff88810ffeb240 (&sb->s_type->i_mutex_key#31){+.+.}-{4:4}, at: fuse_file_write_iter+0xb7f/0x11b0
 #3: ffffffff8fd5c8e0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550
locks held by syz.2.1137/10687: 2, on CPU#1:
 #0: ffff888110b8e460 (sb_writers#16){.+.+}-{0:0}, at: vfs_fallocate+0x5e0/0x7e0
 #1: ffff88810ffeb240 (&sb->s_type->i_mutex_key#31){+.+.}-{4:4}, at: fuse_file_fallocate+0x2d8/0x8a0
locks held by syz.4.2501/19616: 1, last CPU#1:
 #0: ffff88810d866540 (&mm->mmap_lock){++++}-{4:4}, at: __se_sys_move_pages+0x149d/0x1c80

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 16 Comm: pr/ttyS0 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:io_serial_out+0x7c/0xc0
Code: 6a 52 fc 44 89 f9 d3 e5 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 7c 4b c4 fc 41 03 2e 89 d8 89 ea ee <5b> 41 5c 41 5e 41 5f 5d c3 cc cc cc cc cc 44 89 f9 80 e1 07 38 c1
RSP: 0018:ffffc90000157900 EFLAGS: 00000002
RAX: 000000000000003a RBX: 000000000000003a RCX: 0000000000000000
RDX: 00000000000003f8 RSI: 0000000000000000 RDI: 0000000000000020
RBP: 00000000000003f8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffffff8575b7e0 R12: dffffc0000000000
R13: 000000000000003a R14: ffffffff9bd4fe80 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8882a7cbb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000008000 CR3: 0000000112fa6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __serial8250_console_fifo_write+0x1e6/0x3e0
 serial8250_console_write+0xaa1/0x1200
 nbcon_emit_next_record+0xef5/0x1a90
 nbcon_kthread_func+0x679/0x880
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
