------------[ 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/1:4/14601
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: 14601 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: 
[<802019e8>] (dump_backtrace) from [<80201adc>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:8228ef3c r6:00000000 r5:822a086c r4:00000001
[<80201ac4>] (show_stack) from [<8021ee48>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201ac4>] (show_stack) from [<8021ee48>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021edec>] (dump_stack_lvl) from [<8021ee74>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:8228ef3c r6:85946c00 r5:00000000 r4:82a7dd14
[<8021ee5c>] (dump_stack) from [<8020256c>] (vpanic+0xe0/0x2e4 kernel/panic.c:490)
[<8020248c>] (vpanic) from [<802027a4>] (trace_suspend_resume+0x0/0xd8 kernel/panic.c:627)
 r7:80b1894c
[<80202770>] (panic) from [<8025158c>] (check_panic_on_warn kernel/panic.c:377 [inline])
[<80202770>] (panic) from [<8025158c>] (get_taint+0x0/0x1c kernel/panic.c:372)
 r3:8280c544 r2:00000001 r1:822876bc r0:8228ef3c
[<80251514>] (check_panic_on_warn) from [<80251708>] (__warn+0x98/0x1a8 kernel/panic.c:902)
[<80251670>] (__warn) from [<80251a00>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:937)
 r8:00000009 r7:8231b138 r6:e4325df4 r5:85946c00 r4:00000000
[<8025181c>] (warn_slowpath_fmt) from [<80b1894c>] (drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1320)
 r10:83f3a444 r9:ffffff92 r8:00000000 r7:0001eb76 r6:00000000 r5:00000000
 r4:83351c00
[<80b187b0>] (drm_crtc_wait_one_vblank) from [<80b1c4d4>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1330)
 r10:83018605 r9:83351c00 r8:84021400 r7:e4325ebc r6:83351c00 r5:00000000
 r4:83e81040
[<80b1c474>] (drm_client_modeset_wait_for_vblank) from [<80b359bc>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:236 [inline])
[<80b1c474>] (drm_client_modeset_wait_for_vblank) from [<80b359bc>] (drm_fb_helper_damage_work+0x80/0x1e0 drivers/gpu/drm/drm_fb_helper.c:274)
 r7:e4325ebc r6:840214b8 r5:00000000 r4:84021498
[<80b3593c>] (drm_fb_helper_damage_work) from [<80276280>] (process_one_work+0x1b8/0x4fc kernel/workqueue.c:3257)
 r9:83016170 r8:85946c00 r7:ddde3cc0 r6:83018600 r5:84021498 r4:85a44780
[<802760c8>] (process_one_work) from [<80276f04>] (process_scheduled_works kernel/workqueue.c:3340 [inline])
[<802760c8>] (process_one_work) from [<80276f04>] (worker_thread+0x1c4/0x394 kernel/workqueue.c:3421)
 r10:61c88647 r9:85946c00 r8:82804d80 r7:85a447ac r6:ddde3cc0 r5:ddde3ce0
 r4:85a44780
[<80276d40>] (worker_thread) from [<8027f254>] (kthread+0x118/0x138 kernel/kthread.c:467)
 r10:00000000 r9:85a44780 r8:80276d40 r7:e01ede80 r6:85946c00 r5:858fc480
 r4:86004240
[<8027f13c>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xe4325fb0 to 0xe4325ff8)
5fa0:                                     00000000 00000000 00000000 00000000
5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8027f13c r4:86004240
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..