------------[ 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/1:4/6493
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: 6493 Comm: kworker/1:4 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
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)
 r7:82a20f78 r6:00000000 r5:82332448 r4:00000001
[<80201a74>] (show_stack) from [<8021e580>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201a74>] (show_stack) from [<8021e580>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e524>] (dump_stack_lvl) from [<8021e5ac>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:82a20f78 r6:00000000 r5:83f1ee40 r4:82c83d40
[<8021e594>] (dump_stack) from [<80202590>] (vpanic+0x114/0x320 kernel/panic.c:651)
[<8020247c>] (vpanic) from [<802027d0>] (trace_suspend_resume+0x0/0x100 kernel/panic.c:788)
 r7:80b7151c
[<8020279c>] (panic) from [<80250a80>] (check_panic_on_warn kernel/panic.c:525 [inline])
[<8020279c>] (panic) from [<80250a80>] (get_taint+0x0/0x1c kernel/panic.c:520)
 r3:82a0b144 r2:00000001 r1:823181ac r0:8231fb08
[<80250a08>] (check_panic_on_warn) from [<80250bfc>] (__warn+0x98/0x1a4 kernel/panic.c:1104)
[<80250b64>] (__warn) from [<80250ef0>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:1144)
 r8:00000009 r7:823b0044 r6:dfbb1dfc r5:83f1ee40 r4:00000000
[<80250d0c>] (warn_slowpath_fmt) from [<80b7151c>] (drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1329)
 r10:842a2844 r9:ffffff92 r8:00000000 r7:0000f5b6 r6:00000000 r5:00000000
 r4:83febc00
[<80b71380>] (drm_crtc_wait_one_vblank) from [<80b750d8>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1331)
 r10:8302ae05 r9:83febc00 r8:840f8300 r7:dfbb1ec4 r6:83febc00 r5:00000000
 r4:83f90040
[<80b75078>] (drm_client_modeset_wait_for_vblank) from [<80b8ea80>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:237 [inline])
[<80b75078>] (drm_client_modeset_wait_for_vblank) from [<80b8ea80>] (drm_fb_helper_damage_work+0x80/0x1e0 drivers/gpu/drm/drm_fb_helper.c:275)
 r7:dfbb1ec4 r6:840f83b4 r5:00000000 r4:840f8394
[<80b8ea00>] (drm_fb_helper_damage_work) from [<802761d8>] (process_one_work+0x1c8/0x580 kernel/workqueue.c:3322)
 r9:83f1ee40 r8:01800000 r7:ddde4f00 r6:8302ae00 r5:840f8394 r4:861b7680
[<80276010>] (process_one_work) from [<80276e84>] (process_scheduled_works kernel/workqueue.c:3405 [inline])
[<80276010>] (process_one_work) from [<80276e84>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3486)
 r10:00000000 r9:861b76b0 r8:83f1ee40 r7:82a03d80 r6:ddde4f20 r5:ddde4f00
 r4:861b7680
[<80276d18>] (worker_thread) from [<80281700>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:df879e88 r8:861b7b00 r7:861b7680 r6:80276d18 r5:83f1ee40
 r4:8626d080
[<802815e4>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdfbb1fb0 to 0xdfbb1ff8)
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 r5:802815e4 r4:8626d080
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..