------------[ cut here ]------------
WARNING: drivers/gpu/drm/drm_vblank.c:1320 at drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1320, CPU#1: kworker/1:5/10668
faux_driver vkms: [drm] vblank wait timed out on crtc 0
Modules linked in:
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 1 UID: 0 PID: 10668 Comm: kworker/1:5 Not tainted syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
Workqueue: events drm_fb_helper_damage_work
Call trace: 
[<80201a14>] (dump_backtrace) from [<80201b08>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:8281f9b4 r6:00000000 r5:822a8494 r4:00000001
[<80201af0>] (show_stack) from [<8021e400>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201af0>] (show_stack) from [<8021e400>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e3a4>] (dump_stack_lvl) from [<8021e42c>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:8281f9b4 r6:00000000 r5:83febd40 r4:82a80d14
[<8021e414>] (dump_stack) from [<8020260c>] (vpanic+0x114/0x320 kernel/panic.c:650)
[<802024f8>] (vpanic) from [<8020284c>] (trace_suspend_resume+0x0/0x104 kernel/panic.c:787)
 r7:80b3c254
[<80202818>] (panic) from [<80250a70>] (check_panic_on_warn kernel/panic.c:524 [inline])
[<80202818>] (panic) from [<80250a70>] (get_taint+0x0/0x1c kernel/panic.c:519)
 r3:8280c544 r2:00000001 r1:8228f1c0 r0:82296a8c
[<802509f8>] (check_panic_on_warn) from [<80250bec>] (__warn+0x98/0x1ac kernel/panic.c:1062)
[<80250b54>] (__warn) from [<80250ee8>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:1097)
 r8:00000009 r7:82323f6c r6:dfa45dfc r5:83febd40 r4:00000000
[<80250d04>] (warn_slowpath_fmt) from [<80b3c254>] (drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1320)
 r10:84116e44 r9:ffffff92 r8:00000000 r7:0000dc84 r6:00000000 r5:00000000
 r4:831c0c00
[<80b3c0b8>] (drm_crtc_wait_one_vblank) from [<80b3fe3c>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1331)
 r10:8302ae05 r9:831c0c00 r8:84191e00 r7:dfa45ec4 r6:831c0c00 r5:00000000
 r4:831d2040
[<80b3fddc>] (drm_client_modeset_wait_for_vblank) from [<80b59384>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:236 [inline])
[<80b3fddc>] (drm_client_modeset_wait_for_vblank) from [<80b59384>] (drm_fb_helper_damage_work+0x80/0x1e0 drivers/gpu/drm/drm_fb_helper.c:274)
 r7:dfa45ec4 r6:84191eb8 r5:00000000 r4:84191e98
[<80b59304>] (drm_fb_helper_damage_work) from [<802766b8>] (process_one_work+0x1c8/0x59c kernel/workqueue.c:3276)
 r9:83febd40 r8:01800000 r7:ddde4d80 r6:8302ae00 r5:84191e98 r4:86205f00
[<802764f0>] (process_one_work) from [<80277478>] (process_scheduled_works kernel/workqueue.c:3359 [inline])
[<802764f0>] (process_one_work) from [<80277478>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3440)
 r10:00000000 r9:86205f30 r8:83febd40 r7:82804d80 r6:ddde4da0 r5:ddde4d80
 r4:86205f00
[<8027730c>] (worker_thread) from [<80281434>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:df915e88 r8:83015780 r7:86205f00 r6:8027730c r5:83febd40
 r4:86515240
[<80281318>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdfa45fb0 to 0xdfa45ff8)
5fa0:                                     00000000 00000000 00000000 00000000
5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281318 r4:86515240
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..