------------[ 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/1:3/1795
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: 1795 Comm: kworker/1:3 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 r5:822a7fe0 r4:00000001
[<80201af0>] (show_stack) from [<8021e430>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201af0>] (show_stack) from [<8021e430>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e3d4>] (dump_stack_lvl) from [<8021e45c>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:8281f940 r6:00000000 r5:845e8000 r4:82a80d14
[<8021e444>] (dump_stack) from [<8020260c>] (vpanic+0x114/0x320 kernel/panic.c:650)
[<802024f8>] (vpanic) from [<8020284c>] (trace_suspend_resume+0x0/0x104 kernel/panic.c:787)
 r7:80b3b764
[<80202818>] (panic) from [<80250a4c>] (check_panic_on_warn kernel/panic.c:524 [inline])
[<80202818>] (panic) from [<80250a4c>] (get_taint+0x0/0x1c kernel/panic.c:519)
 r3:8280c544 r2:00000001 r1:8228ed38 r0:82296600
[<802509d4>] (check_panic_on_warn) from [<80250bc8>] (__warn+0x98/0x1ac kernel/panic.c:1062)
[<80250b30>] (__warn) from [<80250ec4>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:1097)
 r8:00000009 r7:82323a78 r6:e0469dfc r5:845e8000 r4:00000000
[<80250ce0>] (warn_slowpath_fmt) from [<80b3b764>] (drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1320)
 r10:84146a44 r9:ffffff92 r8:00000000 r7:00046ed5 r6:00000000 r5:00000000
 r4:839a3800
[<80b3b5c8>] (drm_crtc_wait_one_vblank) from [<80b3f34c>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1331)
 r10:8302ae05 r9:839a3800 r8:8411fe00 r7:e0469ec4 r6:839a3800 r5:00000000
 r4:8381d040
[<80b3f2ec>] (drm_client_modeset_wait_for_vblank) from [<80b58894>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:236 [inline])
[<80b3f2ec>] (drm_client_modeset_wait_for_vblank) from [<80b58894>] (drm_fb_helper_damage_work+0x80/0x1e0 drivers/gpu/drm/drm_fb_helper.c:274)
 r7:e0469ec4 r6:8411feb8 r5:00000000 r4:8411fe98
[<80b58814>] (drm_fb_helper_damage_work) from [<8027667c>] (process_one_work+0x1c8/0x59c kernel/workqueue.c:3276)
 r9:845e8000 r8:01800000 r7:ddde4d80 r6:8302ae00 r5:8411fe98 r4:85bbe280
[<802764b4>] (process_one_work) from [<8027743c>] (process_scheduled_works kernel/workqueue.c:3359 [inline])
[<802764b4>] (process_one_work) from [<8027743c>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3440)
 r10:ddde4d80 r9:85bbe2b0 r8:845e8000 r7:82804d80 r6:ddde4da0 r5:ddde4d80
 r4:85bbe280
[<802772d0>] (worker_thread) from [<802813ec>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:dfbe9e88 r8:84c70a00 r7:85bbe280 r6:802772d0 r5:845e8000
 r4:84c27300
[<802812d0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xe0469fb0 to 0xe0469ff8)
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 r5:802812d0 r4:84c27300
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..