------------[ 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/1:0/23
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: 23 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)
 r7:8281f900 r6:00000000 r5:822a4ebc r4:00000001
[<80201af0>] (show_stack) from [<8021e454>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201af0>] (show_stack) from [<8021e454>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e3f8>] (dump_stack_lvl) from [<8021e480>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:8281f900 r6:00000000 r5:8316a400 r4:82a7fd14
[<8021e468>] (dump_stack) from [<802025f4>] (vpanic+0x114/0x320 kernel/panic.c:650)
[<802024e0>] (vpanic) from [<80202834>] (trace_suspend_resume+0x0/0x104 kernel/panic.c:787)
 r7:80b33bc4
[<80202800>] (panic) from [<80250a68>] (check_panic_on_warn kernel/panic.c:524 [inline])
[<80202800>] (panic) from [<80250a68>] (get_taint+0x0/0x1c kernel/panic.c:519)
 r3:8280c544 r2:00000001 r1:8228bc60 r0:82293518
[<802509f0>] (check_panic_on_warn) from [<80250be4>] (__warn+0x98/0x1ac kernel/panic.c:1062)
[<80250b4c>] (__warn) from [<80250ee0>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:1097)
 r8:00000009 r7:82320360 r6:df879dfc r5:8316a400 r4:00000000
[<80250cfc>] (warn_slowpath_fmt) from [<80b33bc4>] (drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1320)
 r10:83be3e44 r9:ffffff92 r8:00000000 r7:000021ff r6:00000000 r5:00000000
 r4:83840000
[<80b33a28>] (drm_crtc_wait_one_vblank) from [<80b377ac>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1330)
 r10:8302ae05 r9:83840000 r8:83be2c00 r7:df879ec4 r6:83840000 r5:00000000
 r4:83b89040
[<80b3774c>] (drm_client_modeset_wait_for_vblank) from [<80b50c8c>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:236 [inline])
[<80b3774c>] (drm_client_modeset_wait_for_vblank) from [<80b50c8c>] (drm_fb_helper_damage_work+0x80/0x1e0 drivers/gpu/drm/drm_fb_helper.c:274)
 r7:df879ec4 r6:83be2cb8 r5:00000000 r4:83be2c98
[<80b50c0c>] (drm_fb_helper_damage_work) from [<80276338>] (process_one_work+0x1b8/0x58c kernel/workqueue.c:3275)
 r9:8316a400 r8:01800000 r7:ddde4d80 r6:8302ae00 r5:83be2c98 r4:830f0000
[<80276180>] (process_one_work) from [<802770fc>] (process_scheduled_works kernel/workqueue.c:3358 [inline])
[<80276180>] (process_one_work) from [<802770fc>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3439)
 r10:ddde4d80 r9:830f002c r8:8316a400 r7:82804d80 r6:ddde4da0 r5:ddde4d80
 r4:830f0000
[<80276f90>] (worker_thread) from [<8027f388>] (kthread+0x118/0x138 kernel/kthread.c:467)
 r10:00000000 r9:830f0000 r8:80276f90 r7:df819d20 r6:8316a400 r5:830eff80
 r4:830fa640
[<8027f270>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdf879fb0 to 0xdf879ff8)
9fa0:                                     00000000 00000000 00000000 00000000
9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8027f270 r4:830fa640
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..