------------[ 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/1:1/13386
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: 13386 Comm: kworker/1:1 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)
 r7:82a1e6fc r6:00000000 r5:8231adf0 r4:00000001
[<80201af0>] (show_stack) from [<8021e2cc>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201af0>] (show_stack) from [<8021e2cc>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e270>] (dump_stack_lvl) from [<8021e2f8>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:82a1e6fc r6:00000000 r5:84734980 r4:82c7bd3c
[<8021e2e0>] (dump_stack) from [<8020260c>] (vpanic+0x114/0x320 kernel/panic.c:650)
[<802024f8>] (vpanic) from [<8020284c>] (trace_suspend_resume+0x0/0x104 kernel/panic.c:787)
 r7:80b4b2d0
[<80202818>] (panic) from [<802506a8>] (check_panic_on_warn kernel/panic.c:524 [inline])
[<80202818>] (panic) from [<802506a8>] (get_taint+0x0/0x1c kernel/panic.c:519)
 r3:82a0b544 r2:00000001 r1:823018d8 r0:823091b8
[<80250630>] (check_panic_on_warn) from [<80250824>] (__warn+0x98/0x1ac kernel/panic.c:1103)
[<8025078c>] (__warn) from [<80250b20>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:1138)
 r8:00000009 r7:823973d0 r6:ea75ddfc r5:84734980 r4:00000000
[<8025093c>] (warn_slowpath_fmt) from [<80b4b2d0>] (drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1320)
 r10:8416fa44 r9:ffffff92 r8:00000000 r7:0007eb72 r6:00000000 r5:00000000
 r4:83f89c00
[<80b4b134>] (drm_crtc_wait_one_vblank) from [<80b4ee9c>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1331)
 r10:8302ae05 r9:83f89c00 r8:838b4500 r7:ea75dec4 r6:83f89c00 r5:00000000
 r4:83190040
[<80b4ee3c>] (drm_client_modeset_wait_for_vblank) from [<80b68664>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:237 [inline])
[<80b4ee3c>] (drm_client_modeset_wait_for_vblank) from [<80b68664>] (drm_fb_helper_damage_work+0x80/0x1e0 drivers/gpu/drm/drm_fb_helper.c:275)
 r7:ea75dec4 r6:838b45b4 r5:00000000 r4:838b4594
[<80b685e4>] (drm_fb_helper_damage_work) from [<80276360>] (process_one_work+0x1c8/0x5a0 kernel/workqueue.c:3302)
 r9:84734980 r8:01800000 r7:ddde4e00 r6:8302ae00 r5:838b4594 r4:85da1200
[<80276198>] (process_one_work) from [<80277124>] (process_scheduled_works kernel/workqueue.c:3385 [inline])
[<80276198>] (process_one_work) from [<80277124>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3466)
 r10:ddde4e00 r9:85da1230 r8:84734980 r7:82a03d80 r6:ddde4e20 r5:ddde4e00
 r4:85da1200
[<80276fb8>] (worker_thread) from [<8028117c>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:ede75e88 r8:85bba200 r7:85da1200 r6:80276fb8 r5:84734980
 r4:85cae800
[<80281060>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xea75dfb0 to 0xea75dff8)
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 r5:80281060 r4:85cae800
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..