------------[ 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/1:1/2217
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: 2217 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 r5:8231a6c4 r4:00000001
[<80201af0>] (show_stack) from [<8021e32c>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201af0>] (show_stack) from [<8021e32c>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e2d0>] (dump_stack_lvl) from [<8021e358>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:82a1e6fc r6:00000000 r5:83f3e200 r4:82c7bd3c
[<8021e340>] (dump_stack) from [<8020260c>] (vpanic+0x114/0x320 kernel/panic.c:650)
[<802024f8>] (vpanic) from [<8020284c>] (trace_suspend_resume+0x0/0x104 kernel/panic.c:787)
 r7:80b49650
[<80202818>] (panic) from [<802507e4>] (check_panic_on_warn kernel/panic.c:524 [inline])
[<80202818>] (panic) from [<802507e4>] (get_taint+0x0/0x1c kernel/panic.c:519)
 r3:82a0b544 r2:00000001 r1:82301230 r0:82308afc
[<8025076c>] (check_panic_on_warn) from [<80250960>] (__warn+0x98/0x1ac kernel/panic.c:1062)
[<802508c8>] (__warn) from [<80250c5c>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:1097)
 r8:00000009 r7:82396a6c r6:ee469dfc r5:83f3e200 r4:00000000
[<80250a78>] (warn_slowpath_fmt) from [<80b49650>] (drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1320)
 r10:84235e44 r9:ffffff92 r8:00000000 r7:0006b162 r6:00000000 r5:00000000
 r4:83fce800
[<80b494b4>] (drm_crtc_wait_one_vblank) from [<80b4d21c>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1331)
 r10:8302ae05 r9:83fce800 r8:83892e00 r7:ee469ec4 r6:83fce800 r5:00000000
 r4:83f14040
[<80b4d1bc>] (drm_client_modeset_wait_for_vblank) from [<80b669e4>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:237 [inline])
[<80b4d1bc>] (drm_client_modeset_wait_for_vblank) from [<80b669e4>] (drm_fb_helper_damage_work+0x80/0x1e0 drivers/gpu/drm/drm_fb_helper.c:275)
 r7:ee469ec4 r6:83892eb4 r5:00000000 r4:83892e94
[<80b66964>] (drm_fb_helper_damage_work) from [<80276484>] (process_one_work+0x1c8/0x5a0 kernel/workqueue.c:3302)
 r9:83f3e200 r8:01800000 r7:ddde4e00 r6:8302ae00 r5:83892e94 r4:85c96f80
[<802762bc>] (process_one_work) from [<80277248>] (process_scheduled_works kernel/workqueue.c:3385 [inline])
[<802762bc>] (process_one_work) from [<80277248>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3466)
 r10:ddde4e00 r9:85c96fb0 r8:83f3e200 r7:82a03d80 r6:ddde4e20 r5:ddde4e00
 r4:85c96f80
[<802770dc>] (worker_thread) from [<8028125c>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:ecffde88 r8:86442e80 r7:85c96f80 r6:802770dc r5:83f3e200
 r4:8508eac0
[<80281140>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xee469fb0 to 0xee469ff8)
9fa0:                                     00000000 00000000 00000000 00000000
9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281140 r4:8508eac0
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..