INFO: task syz.1.12890:5580 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.12890     state:D stack:26760 pid:5580  tgid:5578  ppid:5537   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_timeout+0xc0/0x2c0
 __down_common+0x3b7/0x850
 down+0x80/0xd0
 console_lock+0x58/0x90
 do_con_write+0x12c/0x5500
 con_write+0x27/0x290
 n_tty_write+0xd49/0x11e0
 file_tty_write+0x509/0x9c0
 vfs_write+0x612/0xba0
 ksys_write+0x150/0x270
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd2f759e0d9
RSP: 002b:00007fd2f83ad028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd2f7826090 RCX: 00007fd2f759e0d9
RDX: 0000000000001006 RSI: 0000200000001080 RDI: 000000000000000a
RBP: 00007fd2f7635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd2f7826128 R14: 00007fd2f7826090 R15: 00007ffdf901c578
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by kworker/u12:0/55:
 #0: ffff88816d3ea140 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc9000141fc40 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
2 locks held by kworker/u13:0/56:
 #0: ffff88816d7a3940 ((wq_completion)nbd1-recv){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc9000142fc40 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
3 locks held by kworker/0:2/2410:
2 locks held by getty/5424:
 #0: ffff88810f0ac0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034762e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
3 locks held by kworker/0:5/5673:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90004c57c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffff888119e14250 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1fd/0x3b0
4 locks held by kworker/1:0/24584:
2 locks held by kworker/u12:1/717:
 #0: ffff88816d3ea140 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90008f37c40 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
4 locks held by syz-executor/2617:
2 locks held by kworker/u13:1/4373:
 #0: ffff88816d7a3940 ((wq_completion)nbd1-recv){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90008f0fc40 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
6 locks held by syz.7.12832/5391:
 #0: ffffffff8eb4bfa0 (console_lock){+.+.}-{0:0}, at: vt_ioctl+0x1cf1/0x20d0
 #1: ffff88816c872a70 (&helper->lock){+.+.}-{4:4}, at: __drm_fb_helper_restore_fbdev_mode_unlocked+0x7b/0x1c0
 #2: ffff88816c728128 (&dev->master_mutex){+.+.}-{4:4}, at: drm_master_internal_acquire+0x20/0x80
 #3: ffff88816c872890 (&client->modeset_mutex){+.+.}-{4:4}, at: drm_client_modeset_commit_locked+0x4c/0x4d0
 #4: ffffc900036e73f0 (crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_client_modeset_commit_atomic+0x11a/0x7e0
 #5: ffffc900036e7418 (crtc_ww_class_mutex){+.+.}-{4:4}, at: drm_client_modeset_commit_atomic+0x11a/0x7e0
4 locks held by syz.1.12890/5580:
 #0: ffff8881717ce0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffff8881717ce128 (&tty->atomic_write_lock){+.+.}-{4:4}, at: file_tty_write+0x1e4/0x9c0
 #2: ffff8881717ce2c8 (&tty->termios_rwsem){++++}-{4:4}, at: n_tty_write+0x1f5/0x11e0
 #3: ffffc9000465b370 (&ldata->output_lock){+.+.}-{4:4}, at: n_tty_write+0x66d/0x11e0
1 lock held by syz.4.12973/5976:
2 locks held by kworker/u9:6/7959:
 #0: ffff8881000ac140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90002817c40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
2 locks held by syz.3.13952/8519:
 #0: ffff8881717ce0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffff8881717ce2c8 (&tty->termios_rwsem){++++}-{4:4}, at: tty_set_termios+0x147/0x1800
7 locks held by syz.0.14197/9264:
 #0: ffff88817215d2f0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff88816a69c450 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #2: ffff888174115480 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540
 #3: ffffffff8f397f20 (pci_rescan_remove_lock){+.+.}-{4:4}, at: pci_stop_and_remove_bus_device_locked+0x13/0xb0
 #4: ffff88816851c1f8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb9/0x880
 #5: ffff88816c728260 (&dev->clientlist_mutex){+.+.}-{4:4}, at: drm_client_dev_unregister+0xa1/0x2d0
 #6: ffffffff8f3bf260 (registration_lock){+.+.}-{4:4}, at: unregister_framebuffer+0x2e/0x3b0
3 locks held by syz.9.14208/9292:
 #0: ffff8881717ce0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000465b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
 #2: ffff8881717ce2c8 (&tty->termios_rwsem){++++}-{4:4}, at: n_tty_read+0x530/0x1360
1 lock held by modprobe/9625:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 5045 Comm: udevd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__lock_acquire+0x3d1/0x2e50
Code: 83 3d 26 b4 b4 0e 00 75 13 48 8d 3d d9 0f b8 0e 48 c7 c6 50 fd 34 8e 67 48 0f b9 3a 90 31 c0 48 8b 3c 24 0f b6 98 c4 00 00 00 <49> 8b 46 20 25 ff 1f 00 00 48 0f a3 05 4e 61 d1 12 73 17 48 69 c0
RSP: 0018:ffffc90002807508 EFLAGS: 00000006
RAX: ffffffff941a0bc8 RBX: 0000000000000003 RCX: 000000000000066f
RDX: 0000000000040000 RSI: 0000000000000000 RDI: ffff88816f619e00
RBP: 0000000000000000 R08: 9a00000000000000 R09: 0000000000080000
R10: 0000000000000000 R11: ffff8880239950a0 R12: 000000000000066f
R13: ffff88816f61a9a8 R14: ffff88816f61aa20 R15: 0000000000000003
FS:  00007ff6b34a7c80(0000) GS:ffff88818d95c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3a8c90f108 CR3: 000000017243a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_acquire+0x115/0x350
 _raw_spin_lock_irqsave+0x40/0x60
 __wake_up_common_lock+0x30/0x1f0
 ep_poll_callback+0x5c4/0xad0
 __wake_up_common_lock+0x13a/0x1f0
 sock_def_readable+0x1eb/0x550
 netlink_sendskb+0xa1/0x140
 netlink_sendmsg+0x813/0xb40
 sock_sendmsg_nosec+0x13a/0x180
 ____sys_sendmsg+0x54e/0x850
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1b1/0x290
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff6b3124a4b
Code: ff 89 ef 48 89 04 24 e8 22 56 f9 ff 48 8b 04 24 48 83 c4 20 5d c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6d 48 8b 15 ae c3 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffc12eafe48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000055d7f33a59e0 RCX: 00007ff6b3124a4b
RDX: 0000000000000000 RSI: 00007ffc12eafe58 RDI: 0000000000000004
RBP: 000055d7f33c6b10 R08: 0000000000000001 R09: 0000000000000000
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000000b6 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
