INFO: task syz.0.2530:17887 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.2530      state:D stack:25416 pid:17887 tgid:17886 ppid:17802  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 bdev_open+0xe0/0xd30
 bdev_file_open_by_dev+0x1be/0x240
 bdev_file_open_by_path+0x1cc/0x4d0
 xfs_blkdev_get+0x7a/0x100
 xfs_open_devices+0xb1/0x480
 xfs_fs_fill_super+0x338/0x1600
 get_tree_bdev_flags+0x40e/0x4d0
 vfs_get_tree+0x92/0x2b0
 do_new_mount+0x302/0x9e0
 __se_sys_mount+0x313/0x410
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1f0f7903ca
RSP: 002b:00007f1f10605e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f1f10605ef0 RCX: 00007f1f0f7903ca
RDX: 00002000000000c0 RSI: 00002000000006c0 RDI: 00007f1f10605eb0
RBP: 00002000000000c0 R08: 00007f1f10605ef0 R09: 0000000000008005
R10: 0000000000008005 R11: 0000000000000246 R12: 00002000000006c0
R13: 00007f1f10605eb0 R14: 00000000000095c0 R15: 0000200000000040
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e33d320 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5675:
 #0: ffff88810f28c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000290e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
1 lock held by udevd/10065:
 #0: ffff88802123e358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
2 locks held by syz.0.2530/17887:
 #0: ffff88812fef60e0 (&type->s_umount_key#72/1){+.+.}-{4:4}, at: alloc_super+0x1bb/0x930
 #1: ffff88802123e358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
2 locks held by syz.7.3172/20481:
1 lock held by syz.0.3178/20500:
 #0: ffff888029dd37a0 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x211/0x4d0
1 lock held by syz.0.3178/20501:

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

NMI backtrace for cpu 0
CPU: 0 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+0xf60/0xfa0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 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: 27 Comm: kworker/u10:0 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
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:should_fail_ex+0x4/0x560
Code: ae 8e 4c 89 f2 31 c9 e8 7a 8f c9 ff e9 75 fe ff ff 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 <55> 41 57 41 56 41 55 41 54 53 48 83 ec 18 89 14 24 49 89 f6 48 89
RSP: 0018:ffffc9000060f848 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000001000 RDI: ffffffff8e45f360
RBP: 00000000ffffffff R08: 00000000ffffffff R09: 0000000000000000
R10: ffff88813313cd80 R11: ffffffff81acd510 R12: dffffc0000000000
R13: ffff88801ac42140 R14: ffff88801ac42174 R15: 0000000000001000
FS:  0000000000000000(0000) GS:ffff8881a39fc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557b7605c8 CR3: 000000010f3fc000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 should_failslab+0xa8/0x100
 __kmalloc_node_track_caller_noprof+0xcd/0x800
 kmalloc_reserve+0x136/0x290
 __alloc_skb+0x142/0x2d0
 nsim_dev_trap_report_work+0x29a/0xb80
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
