------------[ 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/1:1/40
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 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)
 r7:82a1eab8 r6:00000000 r5:8231dd70 r4:00000001
[<80201af0>] (show_stack) from [<8021e31c>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201af0>] (show_stack) from [<8021e31c>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e2c0>] (dump_stack_lvl) from [<8021e348>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:82a1eab8 r6:00000000 r5:8398d780 r4:82c7bd3c
[<8021e330>] (dump_stack) from [<8020260c>] (vpanic+0x114/0x320 kernel/panic.c:650)
[<802024f8>] (vpanic) from [<8020284c>] (trace_suspend_resume+0x0/0x104 kernel/panic.c:787)
 r7:80b526d0
[<80202818>] (panic) from [<80250844>] (check_panic_on_warn kernel/panic.c:524 [inline])
[<80202818>] (panic) from [<80250844>] (get_taint+0x0/0x1c kernel/panic.c:519)
 r3:82a0b544 r2:00000001 r1:82304838 r0:8230c134
[<802507cc>] (check_panic_on_warn) from [<802509c0>] (__warn+0x98/0x1ac kernel/panic.c:1103)
[<80250928>] (__warn) from [<80250cbc>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:1138)
 r8:00000009 r7:8239a608 r6:df905dfc r5:8398d780 r4:00000000
[<80250ad8>] (warn_slowpath_fmt) from [<80b526d0>] (drm_crtc_wait_one_vblank+0x19c/0x21c drivers/gpu/drm/drm_vblank.c:1320)
 r10:83143e44 r9:ffffff92 r8:00000000 r7:000212e8 r6:00000000 r5:00000000
 r4:83ebfc00
[<80b52534>] (drm_crtc_wait_one_vblank) from [<80b5629c>] (drm_client_modeset_wait_for_vblank+0x60/0x74 drivers/gpu/drm/drm_client_modeset.c:1331)
 r10:8302ae05 r9:83ebfc00 r8:831e4300 r7:df905ec4 r6:83ebfc00 r5:00000000
 r4:83e31040
[<80b5623c>] (drm_client_modeset_wait_for_vblank) from [<80b6fb24>] (drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:237 [inline])
[<80b5623c>] (drm_client_modeset_wait_for_vblank) from [<80b6fb24>] (drm_fb_helper_damage_work+0x80/0x1e0 drivers/gpu/drm/drm_fb_helper.c:275)
 r7:df905ec4 r6:831e43b4 r5:00000000 r4:831e4394
[<80b6faa4>] (drm_fb_helper_damage_work) from [<80276058>] (process_one_work+0x1c8/0x5a0 kernel/workqueue.c:3314)
 r9:8398d780 r8:01800000 r7:ddde4e00 r6:8302ae00 r5:831e4394 r4:83882c00
[<80275e90>] (process_one_work) from [<80276d24>] (process_scheduled_works kernel/workqueue.c:3397 [inline])
[<80275e90>] (process_one_work) from [<80276d24>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3478)
 r10:ddde4e00 r9:83882c30 r8:8398d780 r7:82a03d80 r6:ddde4e20 r5:ddde4e00
 r4:83882c00
[<80276bb8>] (worker_thread) from [<80281540>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:df879e88 r8:83112000 r7:83882c00 r6:80276bb8 r5:8398d780
 r4:83874e00
[<80281424>] (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 r5:80281424 r4:83874e00
SMP: failed to stop secondary CPUs
Rebooting in 86400 seconds..