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bochs-drm 0000:00:01.0: [drm] vblank wait timed out on crtc 0
WARNING: drivers/gpu/drm/drm_vblank.c:1329 at drm_crtc_wait_one_vblank+0x3bc/0x560, CPU#0: kworker/0:3/5666
Modules linked in:
CPU: 0 UID: 0 PID: 5666 Comm: kworker/0:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events drm_fb_helper_damage_work
RIP: 0010:drm_crtc_wait_one_vblank+0x51a/0x560
Code: c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ef e8 95 a0 9c fc 4d 8b 7d 00 4c 89 f7 4c 89 e6 4c 89 fa 89 d9 <67> 48 0f b9 3a 48 8b 3c 24 89 de e8 c6 f5 ff ff b8 92 ff ff ff 49
RSP: 0018:ffffc90004d277c0 EFLAGS: 00010246
RAX: 1ffff1102cd65c1a RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8881657ec460 RSI: ffffffff8c971000 RDI: ffffffff91864e50
RBP: ffffc90004d278a8 R08: ffffffff917a737f R09: 1ffffffff22f4e6f
R10: dffffc0000000000 R11: fffffbfff22f4e70 R12: ffffffff8c971000
R13: ffff888166b2e0d0 R14: ffffffff91864e50 R15: ffff8881657ec460
FS:  0000000000000000(0000) GS:ffff88818c4bb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5ea6c2aff8 CR3: 0000000173322000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 drm_client_modeset_wait_for_vblank+0xc5/0xf0
 drm_fb_helper_damage_work+0x6cf/0xf20
 process_scheduled_works+0xc3d/0x1630
 worker_thread+0xa47/0xfb0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
