------------[ 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/1:0/23
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: 
[<80201998>] (dump_backtrace) from [<80201a8c>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:82a20ef8 r6:00000000 r5:8232a110 r4:00000001
[<80201a74>] (show_stack) from [<8021e494>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201a74>] (show_stack) from [<8021e494>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e438>] (dump_stack_lvl) from [<8021e4c0>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:82a20ef8 r6:00000000 r5:8317a4c0 r4:82c7ed40
[<8021e4a8>] (dump_stack) from [<80202590>] (vpanic+0x114/0x320 kernel/panic.c:651)
[<8020247c>] (vpanic) from [<802027d0>] (trace_suspend_resume+0x0/0x100 kernel/panic.c:788)
 r7:80b691b4
[<8020279c>] (panic) from [<80250ad0>] (check_panic_on_warn kernel/panic.c:525 [inline])
[<8020279c>] (panic) from [<80250ad0>] (get_taint+0x0/0x1c kernel/panic.c:520)
 r3:82a0b144 r2:00000001 r1:8230fe74 r0:823177d0
[<80250a58>] (check_panic_on_warn) from [<80250c4c>] (__warn+0x98/0x1a4 kernel/panic.c:1104)
[<80250bb4>] (__warn) from [<80250f40>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:1144)
 r8:00000009 r7:823a77e0 r6:df879dfc r5:8317a4c0 r4:00000000
[<80250d5c>] (warn_slowpath_fmt) from [<80b691b4>] (drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1329)
 r10:84069a44 r9:ffffff92 r8:00000000 r7:000014f5 r6:00000000 r5:00000000
 r4:831c8800
[<80b69018>] (drm_crtc_wait_one_vblank) from [<80b6cd70>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1331)
 r10:8302ae05 r9:831c8800 r8:831e4800 r7:df879ec4 r6:831c8800 r5:00000000
 r4:83bc5040
[<80b6cd10>] (drm_client_modeset_wait_for_vblank) from [<80b86718>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:237 [inline])
[<80b6cd10>] (drm_client_modeset_wait_for_vblank) from [<80b86718>] (drm_fb_helper_damage_work+0x80/0x1e0 drivers/gpu/drm/drm_fb_helper.c:275)
 r7:df879ec4 r6:831e48b4 r5:00000000 r4:831e4894
[<80b86698>] (drm_fb_helper_damage_work) from [<80276218>] (process_one_work+0x1c8/0x580 kernel/workqueue.c:3322)
 r9:8317a4c0 r8:01800000 r7:ddde4f00 r6:8302ae00 r5:831e4894 r4:83111580
[<80276050>] (process_one_work) from [<80276ec4>] (process_scheduled_works kernel/workqueue.c:3405 [inline])
[<80276050>] (process_one_work) from [<80276ec4>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3486)
 r10:ddde4f00 r9:831115b0 r8:8317a4c0 r7:82a03d80 r6:ddde4f20 r5:ddde4f00
 r4:83111580
[<80276d58>] (worker_thread) from [<80281740>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:df819d10 r8:83111500 r7:83111580 r6:80276d58 r5:8317a4c0
 r4:8310a4c0
[<80281624>] (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 r5:80281624 r4:8310a4c0
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..