------------[ cut here ]------------
WARNING: drivers/gpu/drm/drm_vblank.c:1329 at drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1329, CPU#1: kworker/1:1/40
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: 40 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
Workqueue: events drm_fb_helper_damage_work
Call trace: 
[<80201998>] (dump_backtrace) from [<80201a8c>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:82a20f78 r6:00000000 r5:82336570 r4:00000001
[<80201a74>] (show_stack) from [<8021ec68>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201a74>] (show_stack) from [<8021ec68>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021ec0c>] (dump_stack_lvl) from [<8021ec94>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:82a20f78 r6:00000000 r5:8331ee40 r4:82c85d40
[<8021ec7c>] (dump_stack) from [<80202590>] (vpanic+0x114/0x320 kernel/panic.c:651)
[<8020247c>] (vpanic) from [<802027d0>] (trace_suspend_resume+0x0/0x100 kernel/panic.c:788)
 r7:80b7e56c
[<8020279c>] (panic) from [<80251b50>] (check_panic_on_warn kernel/panic.c:525 [inline])
[<8020279c>] (panic) from [<80251b50>] (get_taint+0x0/0x1c kernel/panic.c:520)
 r3:82a0b144 r2:00000001 r1:8231c298 r0:82323c10
[<80251ad8>] (check_panic_on_warn) from [<80251ccc>] (__warn+0x98/0x1a4 kernel/panic.c:1104)
[<80251c34>] (__warn) from [<80251fc0>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:1144)
 r8:00000009 r7:823b4824 r6:df905dbc r5:8331ee40 r4:00000000
[<80251ddc>] (warn_slowpath_fmt) from [<80b7e56c>] (drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1329)
 r10:840f1e44 r9:ffffff92 r8:00000000 r7:00004cbf r6:00000000 r5:00000000
 r4:830c1000
[<80b7e3d0>] (drm_crtc_wait_one_vblank) from [<80b82128>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1331)
 r10:830c0c50 r9:830c10c4 r8:830c1188 r7:00000000 r6:830c1000 r5:00000000
 r4:83335040
[<80b820c8>] (drm_client_modeset_wait_for_vblank) from [<80b9d558>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:327 [inline])
[<80b820c8>] (drm_client_modeset_wait_for_vblank) from [<80b9d558>] (drm_fb_helper_damage_work+0x190/0x3d4 drivers/gpu/drm/drm_fb_helper.c:365)
 r7:00000000 r6:842276b4 r5:84227694 r4:84227600
[<80b9d3c8>] (drm_fb_helper_damage_work) from [<802772b8>] (process_one_work+0x1c8/0x580 kernel/workqueue.c:3322)
 r10:8302ae05 r9:8331ee40 r8:01800000 r7:ddde5000 r6:8302ae00 r5:84227694
 r4:83869f00
[<802770f0>] (process_one_work) from [<80277f64>] (process_scheduled_works kernel/workqueue.c:3405 [inline])
[<802770f0>] (process_one_work) from [<80277f64>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3486)
 r10:ddde5000 r9:83869f30 r8:8331ee40 r7:82a03d80 r6:ddde5020 r5:ddde5000
 r4:83869f00
[<80277df8>] (worker_thread) from [<802827b4>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:df879e88 r8:83869e80 r7:83869f00 r6:80277df8 r5:8331ee40
 r4:8388bb00
[<80282698>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdf905fb0 to 0xdf905ff8)
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 r5:80282698 r4:8388bb00
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..