------------[ 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/1:13/8839
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: 8839 Comm: kworker/1:13 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 r5:822a7808 r4:00000001
[<80201af0>] (show_stack) from [<8021e45c>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201af0>] (show_stack) from [<8021e45c>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e400>] (dump_stack_lvl) from [<8021e488>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:8281f940 r6:00000000 r5:85140c00 r4:82a80d14
[<8021e470>] (dump_stack) from [<802025f4>] (vpanic+0x114/0x320 kernel/panic.c:650)
[<802024e0>] (vpanic) from [<80202834>] (trace_suspend_resume+0x0/0x104 kernel/panic.c:787)
 r7:80b39d3c
[<80202800>] (panic) from [<80250a68>] (check_panic_on_warn kernel/panic.c:524 [inline])
[<80202800>] (panic) from [<80250a68>] (get_taint+0x0/0x1c kernel/panic.c:519)
 r3:8280c544 r2:00000001 r1:8228e5ac r0:82295e64
[<802509f0>] (check_panic_on_warn) from [<80250be4>] (__warn+0x98/0x1ac kernel/panic.c:1062)
[<80250b4c>] (__warn) from [<80250ee0>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:1097)
 r8:00000009 r7:823231c0 r6:dfbb5dfc r5:85140c00 r4:00000000
[<80250cfc>] (warn_slowpath_fmt) from [<80b39d3c>] (drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1320)
 r10:84155844 r9:ffffff92 r8:00000000 r7:0001255f r6:00000000 r5:00000000
 r4:83984000
[<80b39ba0>] (drm_crtc_wait_one_vblank) from [<80b3d924>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1330)
 r10:8302ae05 r9:83984000 r8:84154600 r7:dfbb5ec4 r6:83984000 r5:00000000
 r4:83806040
[<80b3d8c4>] (drm_client_modeset_wait_for_vblank) from [<80b56e04>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:236 [inline])
[<80b3d8c4>] (drm_client_modeset_wait_for_vblank) from [<80b56e04>] (drm_fb_helper_damage_work+0x80/0x1e0 drivers/gpu/drm/drm_fb_helper.c:274)
 r7:dfbb5ec4 r6:841546b8 r5:00000000 r4:84154698
[<80b56d84>] (drm_fb_helper_damage_work) from [<8027664c>] (process_one_work+0x1b8/0x58c kernel/workqueue.c:3275)
 r9:85140c00 r8:01800000 r7:ddde4d80 r6:8302ae00 r5:84154698 r4:85d96100
[<80276494>] (process_one_work) from [<80277410>] (process_scheduled_works kernel/workqueue.c:3358 [inline])
[<80276494>] (process_one_work) from [<80277410>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3439)
 r10:00000000 r9:85d9612c r8:85140c00 r7:82804d80 r6:ddde4da0 r5:ddde4d80
 r4:85d96100
[<802772a4>] (worker_thread) from [<8027f6d8>] (kthread+0x118/0x138 kernel/kthread.c:467)
 r10:00000000 r9:85d96100 r8:802772a4 r7:dfbb9e88 r6:85140c00 r5:8759d080
 r4:85db52c0
[<8027f5c0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdfbb5fb0 to 0xdfbb5ff8)
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 r5:8027f5c0 r4:85db52c0
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..