INFO: task swapper/0:1 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:swapper/0       state:D stack:20200 pid:1     tgid:1     ppid:0      task_flags:0x0140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7008
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7065
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __ww_mutex_lock+0x11f4/0x2a20 kernel/locking/mutex.c:783
 ww_mutex_lock+0x3f/0x1c0 kernel/locking/mutex.c:901
 modeset_lock+0x2be/0x640 drivers/gpu/drm/drm_modeset_lock.c:316
 drm_atomic_get_plane_state+0x1e5/0x670 drivers/gpu/drm/drm_atomic.c:564
 drm_client_modeset_commit_atomic+0x227/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1056
 drm_client_modeset_commit_locked+0xcb/0x4d0 drivers/gpu/drm/drm_client_modeset.c:1207
 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1207 [inline]
 drm_fb_helper_pan_display+0x3e7/0xbd0 drivers/gpu/drm/drm_fb_helper.c:1267
 fb_pan_display+0x39e/0x680 drivers/video/fbdev/core/fbmem.c:193
 bit_update_start+0x4c/0x1e0 drivers/video/fbdev/core/bitblit.c:405
 fbcon_switch+0x127e/0x2040 drivers/video/fbdev/core/fbcon.c:2211
 redraw_screen+0x586/0xec0 drivers/tty/vt/vt.c:960
 fbcon_prepare_logo+0xa31/0xe00 drivers/video/fbdev/core/fbcon.c:665
 con2fb_init_display drivers/video/fbdev/core/fbcon.c:851 [inline]
 set_con2fb_map+0xa32/0xfc0 drivers/video/fbdev/core/fbcon.c:918
 do_fb_registered drivers/video/fbdev/core/fbcon.c:3023 [inline]
 fbcon_fb_registered+0x24e/0x610 drivers/video/fbdev/core/fbcon.c:3043
 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:512 [inline]
 register_framebuffer+0x738/0x8d0 drivers/video/fbdev/core/fbmem.c:579
 __drm_fb_helper_initial_config_and_unlock+0x14f1/0x1b90 drivers/gpu/drm/drm_fb_helper.c:1668
 drm_fbdev_client_hotplug+0x16c/0x230 drivers/gpu/drm/clients/drm_fbdev_client.c:66
 drm_client_register+0x172/0x210 drivers/gpu/drm/drm_client.c:143
 drm_fbdev_client_setup+0x1a0/0x3f0 drivers/gpu/drm/clients/drm_fbdev_client.c:168
 drm_client_setup+0x107/0x220 drivers/gpu/drm/clients/drm_client_setup.c:46
 virtio_gpu_probe+0x23a/0x2a0 drivers/gpu/drm/virtio/virtgpu_drv.c:111
 virtio_dev_probe+0xd93/0x1050 drivers/virtio/virtio.c:347
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x267/0xaf0 drivers/base/dd.c:721
 __driver_probe_device+0x18c/0x320 drivers/base/dd.c:863
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:893
 __driver_attach+0x34c/0x640 drivers/base/dd.c:1287
 bus_for_each_dev+0x23b/0x2c0 drivers/base/bus.c:383
 bus_add_driver+0x345/0x670 drivers/base/bus.c:756
 driver_register+0x23a/0x320 drivers/base/driver.c:249
 virtio_gpu_driver_init+0x96/0x110 drivers/gpu/drm/virtio/virtgpu_drv.c:195
 do_one_initcall+0x250/0x8d0 init/main.c:1382
 do_initcall_level+0x104/0x190 init/main.c:1444
 do_initcalls+0x59/0xa0 init/main.c:1460
 kernel_init_freeable+0x2a6/0x3e0 init/main.c:1692
 kernel_init+0x1d/0x1d0 init/main.c:1582
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
INFO: task kworker/0:1:10 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:1     state:D stack:26120 pid:10    tgid:10    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events virtio_gpu_dequeue_ctrl_func
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7008
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7065
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776
 drm_client_dev_hotplug+0xdc/0x4f0 drivers/gpu/drm/drm_client_event.c:98
 virtio_gpu_dequeue_ctrl_func+0x506/0x8c0 drivers/gpu/drm/virtio/virtgpu_vq.c:265
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
INFO: task kworker/0:2:53 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:2     state:D stack:24584 pid:53    tgid:53    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events drm_fb_helper_damage_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7008
 virtio_gpu_queue_ctrl_sgs drivers/gpu/drm/virtio/virtgpu_vq.c:399 [inline]
 virtio_gpu_queue_fenced_ctrl_buffer+0x760/0x1090 drivers/gpu/drm/virtio/virtgpu_vq.c:500
 virtio_gpu_resource_flush drivers/gpu/drm/virtio/virtgpu_plane.c:226 [inline]
 virtio_gpu_primary_plane_update+0xcff/0x13a0 drivers/gpu/drm/virtio/virtgpu_plane.c:301
 drm_atomic_helper_commit_planes+0x60f/0xec0 drivers/gpu/drm/drm_atomic_helper.c:3038
 drm_atomic_helper_commit_tail+0x5f/0x500 drivers/gpu/drm/drm_atomic_helper.c:1989
 commit_tail+0x29a/0x3a0 drivers/gpu/drm/drm_atomic_helper.c:2074
 drm_atomic_helper_commit+0xa6e/0xb10 drivers/gpu/drm/drm_atomic_helper.c:2312
 drm_atomic_commit+0x246/0x2b0 drivers/gpu/drm/drm_atomic.c:1775
 drm_atomic_helper_dirtyfb+0xdec/0xf80 drivers/gpu/drm/drm_damage_helper.c:183
 drm_fbdev_shmem_helper_fb_dirty+0x160/0x2d0 drivers/gpu/drm/drm_fbdev_shmem.c:117
 drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:248 [inline]
 drm_fb_helper_damage_work+0x2b3/0x750 drivers/gpu/drm/drm_fb_helper.c:274
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Showing all locks held in the system:
9 locks held by swapper/0/1:
 #0: ffff888032d121b8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:949 [inline]
 #0: ffff888032d121b8 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1166 [inline]
 #0: ffff888032d121b8 (&dev->mutex){....}-{4:4}, at: __driver_attach+0x341/0x640 drivers/base/dd.c:1286
 #1: ffff8880351fa278 (&dev->clientlist_mutex){+.+.}-{4:4}, at: drm_client_register+0x4f/0x210 drivers/gpu/drm/drm_client.c:129
 #2: ffffffff8ef5d448 (registration_lock){+.+.}-{4:4}, at: register_framebuffer+0x8d/0x8d0 drivers/video/fbdev/core/fbmem.c:578
 #3: ffffffff8e7509a0 (console_lock){+.+.}-{0:0}, at: fbcon_fb_registered+0x49/0x610 drivers/video/fbdev/core/fbcon.c:3039
 #4: ffff88801cd36a80 (&helper->lock){+.+.}-{4:4}, at: drm_fb_helper_pan_display+0xbe/0xbd0 drivers/gpu/drm/drm_fb_helper.c:1260
 #5: ffff8880351fa130 (&dev->master_mutex){+.+.}-{4:4}, at: drm_master_internal_acquire+0x20/0x80 drivers/gpu/drm/drm_auth.c:435
 #6: ffff88801cd36898 (&client->modeset_mutex){+.+.}-{4:4}, at: drm_client_modeset_commit_locked+0x4c/0x4d0 drivers/gpu/drm/drm_client_modeset.c:1205
 #7: ffffc900001aea70 (crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_client_modeset_commit_atomic+0x11a/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1043
 #8: ffffc900001aea98 (crtc_ww_class_mutex){+.+.}-{4:4}, at: drm_client_modeset_commit_atomic+0x11a/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1043
3 locks held by kworker/0:1/10:
 #0: ffff88801aca6948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3251 [inline]
 #0: ffff88801aca6948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3359
 #1: ffffc9000023fc40 ((work_completion)(&vgvq->dequeue_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3252 [inline]
 #1: ffffc9000023fc40 ((work_completion)(&vgvq->dequeue_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3359
 #2: ffff8880351fa278 (&dev->clientlist_mutex){+.+.}-{4:4}, at: drm_client_dev_hotplug+0xdc/0x4f0 drivers/gpu/drm/drm_client_event.c:98
2 locks held by kworker/u4:0/12:
 #0: ffff88801ac94148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3251 [inline]
 #0: ffff88801ac94148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3359
 #1: ffffc9000025fc40 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3252 [inline]
 #1: ffffc9000025fc40 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3359
1 lock held by khungtaskd/26:
 #0: ffffffff8e75e560 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #0: ffffffff8e75e560 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #0: ffffffff8e75e560 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
5 locks held by kworker/0:2/53:
 #0: ffff88801aca6948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3251 [inline]
 #0: ffff88801aca6948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3359
 #1: ffffc90000affc40 ((work_completion)(&helper->damage_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3252 [inline]
 #1: ffffc90000affc40 ((work_completion)(&helper->damage_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3359
 #2: ffffc90000aff870 (crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_atomic_helper_dirtyfb+0x106/0xf80 drivers/gpu/drm/drm_damage_helper.c:125
 #3: ffffc90000aff898 (crtc_ww_class_mutex){+.+.}-{4:4}, at: drm_atomic_helper_dirtyfb+0x106/0xf80 drivers/gpu/drm/drm_damage_helper.c:125
 #4: ffffffff8f0622d8 (drm_unplug_srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:187 [inline]
 #4: ffffffff8f0622d8 (drm_unplug_srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:294 [inline]
 #4: ffffffff8f0622d8 (drm_unplug_srcu){.+.+}-{0:0}, at: drm_dev_enter+0x49/0x150 drivers/gpu/drm/drm_drv.c:451

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