------------[ cut here ]------------
WARNING: drivers/gpu/drm/drm_vblank.c:1329 at drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1329, CPU#1: kworker/1:4/3723
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: 3723 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
Workqueue: events drm_fb_helper_damage_work
Call trace: 
[<80201998>] (dump_backtrace) from [<80201a8c>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:82a20f78 r6:00000000 r5:82331fc0 r4:00000001
[<80201a74>] (show_stack) from [<8021e5e0>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201a74>] (show_stack) from [<8021e5e0>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e584>] (dump_stack_lvl) from [<8021e60c>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:82a20f78 r6:00000000 r5:84984980 r4:82c83d40
[<8021e5f4>] (dump_stack) from [<80202590>] (vpanic+0x114/0x320 kernel/panic.c:651)
[<8020247c>] (vpanic) from [<802027d0>] (trace_suspend_resume+0x0/0x100 kernel/panic.c:788)
 r7:80b6f46c
[<8020279c>] (panic) from [<80250a88>] (check_panic_on_warn kernel/panic.c:525 [inline])
[<8020279c>] (panic) from [<80250a88>] (get_taint+0x0/0x1c kernel/panic.c:520)
 r3:82a0b144 r2:00000001 r1:82317d24 r0:8231f680
[<80250a10>] (check_panic_on_warn) from [<80250c04>] (__warn+0x98/0x1a4 kernel/panic.c:1104)
[<80250b6c>] (__warn) from [<80250ef8>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:1144)
 r8:00000009 r7:823afb18 r6:dfe01dfc r5:84984980 r4:00000000
[<80250d14>] (warn_slowpath_fmt) from [<80b6f46c>] (drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1329)
 r10:841fa644 r9:ffffff92 r8:00000000 r7:00005e45 r6:00000000 r5:00000000
 r4:840f7800
[<80b6f2d0>] (drm_crtc_wait_one_vblank) from [<80b73028>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1331)
 r10:8302ae05 r9:840f7800 r8:841bc600 r7:dfe01ec4 r6:840f7800 r5:00000000
 r4:83333040
[<80b72fc8>] (drm_client_modeset_wait_for_vblank) from [<80b8c9d0>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:237 [inline])
[<80b72fc8>] (drm_client_modeset_wait_for_vblank) from [<80b8c9d0>] (drm_fb_helper_damage_work+0x80/0x1e0 drivers/gpu/drm/drm_fb_helper.c:275)
 r7:dfe01ec4 r6:841bc6b4 r5:00000000 r4:841bc694
[<80b8c950>] (drm_fb_helper_damage_work) from [<802761e0>] (process_one_work+0x1c8/0x580 kernel/workqueue.c:3322)
 r9:84984980 r8:01800000 r7:ddde4f00 r6:8302ae00 r5:841bc694 r4:860ffe80
[<80276018>] (process_one_work) from [<80276e8c>] (process_scheduled_works kernel/workqueue.c:3405 [inline])
[<80276018>] (process_one_work) from [<80276e8c>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3486)
 r10:ddde4f00 r9:860ffeb0 r8:84984980 r7:82a03d80 r6:ddde4f20 r5:ddde4f00
 r4:860ffe80
[<80276d20>] (worker_thread) from [<80281708>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:e02d5e88 r8:860ffe00 r7:860ffe80 r6:80276d20 r5:84984980
 r4:860452c0
[<802815ec>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdfe01fb0 to 0xdfe01ff8)
1fa0:                                     00000000 00000000 00000000 00000000
1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802815ec r4:860452c0
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..