------------[ 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/1:2/90
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: 90 Comm: kworker/1:2 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
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)
 r7:8281f940 r6:00000000 r5:822a7a0c r4:00000001
[<80201af0>] (show_stack) from [<8021e44c>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201af0>] (show_stack) from [<8021e44c>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e3f0>] (dump_stack_lvl) from [<8021e478>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:8281f940 r6:00000000 r5:833c6c00 r4:82a80d14
[<8021e460>] (dump_stack) from [<802025f4>] (vpanic+0x114/0x320 kernel/panic.c:650)
[<802024e0>] (vpanic) from [<80202834>] (trace_suspend_resume+0x0/0x104 kernel/panic.c:787)
 r7:80b39edc
[<80202800>] (panic) from [<80250a74>] (check_panic_on_warn kernel/panic.c:524 [inline])
[<80202800>] (panic) from [<80250a74>] (get_taint+0x0/0x1c kernel/panic.c:519)
 r3:8280c544 r2:00000001 r1:8228e7b0 r0:82296068
[<802509fc>] (check_panic_on_warn) from [<80250bf0>] (__warn+0x98/0x1ac kernel/panic.c:1062)
[<80250b58>] (__warn) from [<80250eec>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:1097)
 r8:00000009 r7:82323410 r6:df94ddfc r5:833c6c00 r4:00000000
[<80250d08>] (warn_slowpath_fmt) from [<80b39edc>] (drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1320)
 r10:83ee7c44 r9:ffffff92 r8:00000000 r7:0000ba26 r6:00000000 r5:00000000
 r4:839d4800
[<80b39d40>] (drm_crtc_wait_one_vblank) from [<80b3dac4>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1331)
 r10:8302ae05 r9:839d4800 r8:83ef1600 r7:df94dec4 r6:839d4800 r5:00000000
 r4:83e33040
[<80b3da64>] (drm_client_modeset_wait_for_vblank) from [<80b5700c>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:236 [inline])
[<80b3da64>] (drm_client_modeset_wait_for_vblank) from [<80b5700c>] (drm_fb_helper_damage_work+0x80/0x1e0 drivers/gpu/drm/drm_fb_helper.c:274)
 r7:df94dec4 r6:83ef16b8 r5:00000000 r4:83ef1698
[<80b56f8c>] (drm_fb_helper_damage_work) from [<80276670>] (process_one_work+0x1b8/0x58c kernel/workqueue.c:3275)
 r9:833c6c00 r8:01800000 r7:ddde4d80 r6:8302ae00 r5:83ef1698 r4:83e46500
[<802764b8>] (process_one_work) from [<80277434>] (process_scheduled_works kernel/workqueue.c:3358 [inline])
[<802764b8>] (process_one_work) from [<80277434>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3439)
 r10:00000000 r9:83e4652c r8:833c6c00 r7:82804d80 r6:ddde4da0 r5:ddde4d80
 r4:83e46500
[<802772c8>] (worker_thread) from [<8027f6fc>] (kthread+0x118/0x138 kernel/kthread.c:467)
 r10:00000000 r9:83e46500 r8:802772c8 r7:df879e88 r6:833c6c00 r5:83e46580
 r4:83887cc0
[<8027f5e4>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdf94dfb0 to 0xdf94dff8)
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 r5:8027f5e4 r4:83887cc0
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..