------------[ 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/1:0/11121
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: 11121 Comm: kworker/1:0 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 r5:822a8908 r4:00000001
[<80201af0>] (show_stack) from [<8021e410>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201af0>] (show_stack) from [<8021e410>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e3b4>] (dump_stack_lvl) from [<8021e43c>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:8281f9b4 r6:00000000 r5:848924c0 r4:82a80d14
[<8021e424>] (dump_stack) from [<8020260c>] (vpanic+0x114/0x320 kernel/panic.c:650)
[<802024f8>] (vpanic) from [<8020284c>] (trace_suspend_resume+0x0/0x104 kernel/panic.c:787)
 r7:80b3d044
[<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 r1:8228f614 r0:82296ee0
[<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 r7:82324518 r6:ea91ddfc r5:848924c0 r4:00000000
[<80250d04>] (warn_slowpath_fmt) from [<80b3d044>] (drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1320)
 r10:840c9a44 r9:ffffff92 r8:00000000 r7:0002c379 r6:00000000 r5:00000000
 r4:8397a800
[<80b3cea8>] (drm_crtc_wait_one_vblank) from [<80b40c2c>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1331)
 r10:8302ae05 r9:8397a800 r8:840d1400 r7:ea91dec4 r6:8397a800 r5:00000000
 r4:831df040
[<80b40bcc>] (drm_client_modeset_wait_for_vblank) from [<80b5a174>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:236 [inline])
[<80b40bcc>] (drm_client_modeset_wait_for_vblank) from [<80b5a174>] (drm_fb_helper_damage_work+0x80/0x1e0 drivers/gpu/drm/drm_fb_helper.c:274)
 r7:ea91dec4 r6:840d14b8 r5:00000000 r4:840d1498
[<80b5a0f4>] (drm_fb_helper_damage_work) from [<802766b8>] (process_one_work+0x1c8/0x59c kernel/workqueue.c:3276)
 r9:848924c0 r8:01800000 r7:ddde4d80 r6:8302ae00 r5:840d1498 r4:8687bf80
[<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:ddde4d80 r9:8687bfb0 r8:848924c0 r7:82804d80 r6:ddde4da0 r5:ddde4d80
 r4:8687bf80
[<8027730c>] (worker_thread) from [<802814a4>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:eab65e88 r8:867bab00 r7:8687bf80 r6:8027730c r5:848924c0
 r4:85a9c9c0
[<80281388>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xea91dfb0 to 0xea91dff8)
dfa0:                                     00000000 00000000 00000000 00000000
dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281388 r4:85a9c9c0
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..