------------[ cut here ]------------
WARNING: drivers/gpu/drm/drm_vblank.c:1318 at drm_wait_one_vblank+0x198/0x258 drivers/gpu/drm/drm_vblank.c:1318, CPU#1: kworker/1:7/6943
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: 6943 Comm: kworker/1:7 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: ARM-Versatile Express
Workqueue: events drm_fb_helper_damage_work
Call trace: 
[<80201a74>] (dump_backtrace) from [<80201b70>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:82283ac4 r6:83f08c00 r5:00000000 r4:82295878
[<80201b58>] (show_stack) from [<8021ee18>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201b58>] (show_stack) from [<8021ee18>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:120)
[<8021edc4>] (dump_stack_lvl) from [<8021ee58>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000000 r4:82a7bd14
[<8021ee40>] (dump_stack) from [<80202648>] (vpanic+0xe0/0x2e8 kernel/panic.c:489)
[<80202568>] (vpanic) from [<80202884>] (trace_suspend_resume+0x0/0xd8 kernel/panic.c:626)
 r7:80b11fb4
[<80202850>] (panic) from [<802520b0>] (check_panic_on_warn kernel/panic.c:376 [inline])
[<80202850>] (panic) from [<802520b0>] (get_taint+0x0/0x1c kernel/panic.c:371)
 r3:8280c704 r2:00000001 r1:8227c02c r0:82283ac4
[<80252038>] (check_panic_on_warn) from [<80252228>] (__warn+0x94/0x1a4 kernel/panic.c:901)
[<80252194>] (__warn) from [<80252520>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:936)
 r8:00000009 r7:823116ac r6:eabd5dd4 r5:83f08c00 r4:00000000
[<8025233c>] (warn_slowpath_fmt) from [<80b11fb4>] (drm_wait_one_vblank+0x198/0x258 drivers/gpu/drm/drm_vblank.c:1318)
 r10:83016170 r9:840d0c44 r8:00000000 r7:000128eb r6:00000000 r5:00000000
 r4:8325f400
[<80b11e1c>] (drm_wait_one_vblank) from [<80b1208c>] (drm_crtc_wait_one_vblank+0x18/0x1c drivers/gpu/drm/drm_vblank.c:1334)
 r9:83018605 r8:8325f400 r7:840d1e00 r6:8325f400 r5:00000000 r4:83f29040
[<80b12074>] (drm_crtc_wait_one_vblank) from [<80b15c3c>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1330)
[<80b15bdc>] (drm_client_modeset_wait_for_vblank) from [<80b2eef8>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:334 [inline])
[<80b15bdc>] (drm_client_modeset_wait_for_vblank) from [<80b2eef8>] (drm_fb_helper_damage_work+0x50/0x1c8 drivers/gpu/drm/drm_fb_helper.c:369)
 r7:840d1e00 r6:840d1eb8 r5:00000000 r4:840d1e98
[<80b2eea8>] (drm_fb_helper_damage_work) from [<80275db8>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3257)
 r8:83f08c00 r7:ddde3b40 r6:83018600 r5:840d1e98 r4:85d85480
[<80275c04>] (process_one_work) from [<802764f8>] (process_scheduled_works kernel/workqueue.c:3340 [inline])
[<80275c04>] (process_one_work) from [<802764f8>] (worker_thread+0x1fc/0x3d8 kernel/workqueue.c:3421)
 r10:61c88647 r9:83f08c00 r8:85d854ac r7:82804d80 r6:ddde3b40 r5:ddde3b60
 r4:85d85480
[<802762fc>] (worker_thread) from [<8027f6fc>] (kthread+0x12c/0x280 kernel/kthread.c:463)
 r10:00000000 r9:85d85480 r8:802762fc r7:df879e60 r6:85d85b00 r5:83f08c00
 r4:00000001
[<8027f5d0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xeabd5fb0 to 0xeabd5ff8)
5fa0:                                     00000000 00000000 00000000 00000000
5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8027f5d0
 r4:85f3fb00
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..