------------[ 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/1:12/15510
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: 15510 Comm: kworker/1:12 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)
 r7:82a1eab8 r6:00000000 r5:8231e108 r4:00000001
[<80201af0>] (show_stack) from [<8021e37c>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201af0>] (show_stack) from [<8021e37c>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e320>] (dump_stack_lvl) from [<8021e3a8>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:82a1eab8 r6:00000000 r5:86193200 r4:82c7bd3c
[<8021e390>] (dump_stack) from [<8020260c>] (vpanic+0x114/0x320 kernel/panic.c:650)
[<802024f8>] (vpanic) from [<8020284c>] (trace_suspend_resume+0x0/0x104 kernel/panic.c:787)
 r7:80b528d8
[<80202818>] (panic) from [<80250844>] (check_panic_on_warn kernel/panic.c:524 [inline])
[<80202818>] (panic) from [<80250844>] (get_taint+0x0/0x1c kernel/panic.c:519)
 r3:82a0b544 r2:00000001 r1:82304bd0 r0:8230c4cc
[<802507cc>] (check_panic_on_warn) from [<802509c0>] (__warn+0x98/0x1ac kernel/panic.c:1103)
[<80250928>] (__warn) from [<80250cbc>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:1138)
 r8:00000009 r7:8239a9c0 r6:dfaf1dfc r5:86193200 r4:00000000
[<80250ad8>] (warn_slowpath_fmt) from [<80b528d8>] (drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1320)
 r10:8417e444 r9:ffffff92 r8:00000000 r7:0001eff0 r6:00000000 r5:00000000
 r4:8380d400
[<80b5273c>] (drm_crtc_wait_one_vblank) from [<80b564a4>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1331)
 r10:8302ae05 r9:8380d400 r8:831e5300 r7:dfaf1ec4 r6:8380d400 r5:00000000
 r4:83f82040
[<80b56444>] (drm_client_modeset_wait_for_vblank) from [<80b6fd2c>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:237 [inline])
[<80b56444>] (drm_client_modeset_wait_for_vblank) from [<80b6fd2c>] (drm_fb_helper_damage_work+0x80/0x1e0 drivers/gpu/drm/drm_fb_helper.c:275)
 r7:dfaf1ec4 r6:831e53b4 r5:00000000 r4:831e5394
[<80b6fcac>] (drm_fb_helper_damage_work) from [<80276084>] (process_one_work+0x1c8/0x5a0 kernel/workqueue.c:3314)
 r9:86193200 r8:01800000 r7:ddde4f00 r6:8302ae00 r5:831e5394 r4:8597d800
[<80275ebc>] (process_one_work) from [<80276d50>] (process_scheduled_works kernel/workqueue.c:3397 [inline])
[<80275ebc>] (process_one_work) from [<80276d50>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3478)
 r10:ddde4f00 r9:8597d830 r8:86193200 r7:82a03d80 r6:ddde4f20 r5:ddde4f00
 r4:8597d800
[<80276be4>] (worker_thread) from [<80281590>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:dfa3de88 r8:8636d600 r7:8597d800 r6:80276be4 r5:86193200
 r4:86427b80
[<80281474>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdfaf1fb0 to 0xdfaf1ff8)
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 r5:80281474 r4:86427b80
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..