WARNING in drm_wait_one

WARNING in drm_wait_one_vblank
Status: upstream: reported on 2021/05/05 14:02
Reported-by: syzbot+6f7fe2dbc479dca0ed17@syzkaller.appspotmail.com
First crash: 89d, last: 2h13m

Sample crash report:

------------[ cut here ]------------
platform vkms: vblank wait timed out on crtc 0
WARNING: CPU: 1 PID: 23867 at drivers/gpu/drm/drm_vblank.c:1269 drm_wait_one_vblank+0x930/0x9b0 drivers/gpu/drm/drm_vblank.c:1269
Modules linked in:
CPU: 1 PID: 23867 Comm: syz-executor.4 Not tainted 5.14.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:drm_wait_one_vblank+0x930/0x9b0 drivers/gpu/drm/drm_vblank.c:1269
Code: 3c 08 00 74 08 4c 89 ff e8 4d b6 2e fd 49 8b 1f 48 c7 c7 e0 56 ab 8a 4c 89 f6 48 89 da 8b 5c 24 0c 89 d9 31 c0 e8 60 52 b1 fc <0f> 0b 49 be 00 00 00 00 00 fc ff df e9 8a fb ff ff 89 d1 80 e1 07
RSP: 0018:ffffc9000993fac0 EFLAGS: 00010246
RAX: b5437b7766bd4e00 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc90012162000 RSI: 0000000000016576 RDI: 0000000000016577
RBP: ffffc9000993fc00 R08: ffffffff81663bd2 R09: ffffed10173a3f24
R10: ffffed10173a3f24 R11: 0000000000000000 R12: ffff88801ed40000
R13: 1ffff92001327f64 R14: ffffffff8aaf51e0 R15: ffff88801ed1c010
FS:  00007f6b5c8be700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000970004 CR3: 0000000092690000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 drm_fb_helper_ioctl+0x110/0x140 drivers/gpu/drm/drm_fb_helper.c:1197
 do_fb_ioctl+0x1a9/0x7e0 drivers/video/fbdev/core/fbmem.c:1169
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:1055
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6b5c8be188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000000 RSI: 0000000040044620 RDI: 0000000000000003
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fff14e5755f R14: 00007f6b5c8be300 R15: 0000000000022000

Crashes (9):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci-upstream-kasan-gce-smack-root	2021/07/30 09:09	upstream	7e96bf476270	c585c7b0	.config	log	report	info	WARNING in drm_wait_one_vblank
ci-upstream-kasan-gce-root	2021/07/29 15:52	upstream	4010a528219e	b44001ce	.config	log	report	info	WARNING in drm_wait_one_vblank
ci-upstream-kasan-gce	2021/07/09 05:24	upstream	3dbdb38e2869	1b20171a	.config	log	report	info	WARNING in drm_wait_one_vblank
ci-upstream-kasan-gce-smack-root	2021/07/06 00:48	upstream	3dbdb38e2869	55aa55c2	.config	log	report	info	WARNING in drm_wait_one_vblank
ci-upstream-kasan-gce-root	2021/06/23 11:14	upstream	0c18f29aae7c	aba2b2fb	.config	log	report	info	WARNING in drm_wait_one_vblank
ci-upstream-kasan-gce-root	2021/06/06 15:26	upstream	f5b6eb1e0182	500c2339	.config	log	report	info	WARNING in drm_wait_one_vblank
ci-upstream-kasan-gce	2021/05/30 07:37	upstream	6799d4f2da49	325a8dab	.config	log	report	info	WARNING in drm_wait_one_vblank
ci-upstream-kasan-gce	2021/05/26 13:20	upstream	ad9f25d33860	54f0bcf1	.config	log	report	info	WARNING in drm_wait_one_vblank
ci-upstream-kasan-gce	2021/05/01 14:00	upstream	d2b6f8a17919	77e2b668	.config	log	report	info	WARNING in drm_wait_one_vblank