WARNING in drm_wait_one_vblank

Status: upstream: reported C repro on 2023/03/31 07:06
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+9a8f87865d5e2e8ef57f@syzkaller.appspotmail.com
First crash: 1222d, last: 10d
Fix bisection: the issue occurs on the latest tested release (bisect log)
Crash: WARNING in drm_wait_one_vblank (log)
Repro: C syz .config
  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[PATCH] drm/vblank: fix misuse of drm_WARN in drm_wait_one_vblank() 4 (4) 2025/01/13 09:47
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2025/02/05 linux-5.15.y (ToT) c16c81c81336 C [report] WARNING in drm_wait_one_vblank
2023/05/17 upstream (ToT) f1fcbaa18b28 C [report] WARNING in drm_wait_one_vblank
2025/02/05 upstream (ToT) 5c8c229261f1 C Didn't crash
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 WARNING in drm_wait_one_vblank -1 1 121d 121d 0/2 auto-obsoleted due to no activity on 2026/07/13 20:24
upstream WARNING in drm_wait_one_vblank dri -1 syz, C error inconclusive 375 915d 1917d 0/29 auto-obsoleted due to no activity on 2024/04/11 15:51
upstream WARNING in drm_wait_one_vblank (2) dri -1 syz, C error 3650 209d 733d 29/29 fixed on 2026/01/07 12:29
linux-6.1 WARNING in drm_wait_one_vblank origin:upstream missing-backport -1 syz, C inconclusive 9 282d 1217d 0/3 upstream: reported C repro on 2023/04/05 12:39
upstream WARNING in drm_wait_one_vblank (3) prio:low dri -1 syz, C error error 3128 142d 205d 0/29 upstream: reported C repro on 2026/01/11 12:41
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/07/25 12:49 14m retest repro linux-5.15.y report log
2026/07/25 12:49 15m retest repro linux-5.15.y report log
2026/07/25 12:49 14m retest repro linux-5.15.y report log
2026/06/20 00:49 15m retest repro linux-5.15.y report log
2026/05/09 09:36 15m retest repro linux-5.15.y report log
2026/05/09 09:36 15m retest repro linux-5.15.y report log
2026/04/15 17:03 37m retest repro linux-5.15.y report log
2026/04/01 11:46 9m retest repro linux-5.15.y report log
2026/02/18 18:27 14m retest repro linux-5.15.y report log
2026/02/18 18:27 9m retest repro linux-5.15.y report log
▶ ▼ Fix bisection attempts (12)
Created Duration User Patch Repo Result
2025/03/01 17:56 1h27m fix candidate upstream OK (0) job log
2024/11/08 22:13 1h59m bisect fix linux-5.15.y OK (0) job log log
2024/09/14 20:08 2h32m bisect fix linux-5.15.y OK (0) job log log
2024/08/12 11:21 1h00m bisect fix linux-5.15.y OK (0) job log log
2024/06/26 15:44 1h18m bisect fix linux-5.15.y OK (0) job log log
2024/05/10 06:41 1h21m bisect fix linux-5.15.y OK (0) job log log
2024/04/05 20:10 2h41m bisect fix linux-5.15.y OK (0) job log log
2023/12/21 19:02 54m bisect fix linux-5.15.y OK (0) job log log
2023/11/07 21:11 1h44m bisect fix linux-5.15.y OK (0) job log log
2023/08/16 04:04 3h48m bisect fix linux-5.15.y OK (0) job log log
2023/06/22 10:17 42m bisect fix linux-5.15.y OK (0) job log log
2023/04/30 15:17 36m bisect fix linux-5.15.y OK (0) job log log

Sample crash report:
platform vkms: vblank wait timed out on crtc 0
WARNING: CPU: 1 PID: 3508 at drivers/gpu/drm/drm_vblank.c:1269 drm_wait_one_vblank+0x95a/0x9e0 drivers/gpu/drm/drm_vblank.c:1269
Modules linked in:

CPU: 1 PID: 3508 Comm: syz-executor427 Not tainted 5.15.145-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:drm_wait_one_vblank+0x95a/0x9e0 drivers/gpu/drm/drm_vblank.c:1269
Code: df 80 3c 08 00 74 08 4c 89 ff e8 91 3f 31 fd 49 8b 1f 48 c7 c7 60 3a eb 8a 4c 89 f6 48 89 da 8b 5c 24 0c 89 d9 e8 66 3f b3 fc <0f> 0b 49 be 00 00 00 00 00 fc ff df e9 80 fb ff ff 44 89 e9 80 e1
RSP: 0018:ffffc90002cb7ac0 EFLAGS: 00010246

RAX: e0381ce0d77ba000 RBX: 0000000000000000 RCX: ffff88807edd0000
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc90002cb7c00 R08: ffffffff81665aec R09: fffffbfff1f79e24
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000596f64
R13: 0000000000000b08 R14: ffffffff8af9dbe0 R15: ffff88801bd1c010
FS:  0000555556691380(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200000c8 CR3: 00000000795c8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 drm_fb_helper_ioctl+0x110/0x140 drivers/gpu/drm/drm_fb_helper.c:1197
 do_fb_ioctl+0x1d2/0x890 drivers/video/fbdev/core/fbmem.c:1191
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860
 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+0x61/0xcb
RIP: 0033:0x7f8a6ab2ee29
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffccaf74508 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffccaf74520 RCX: 00007f8a6ab2ee29
RDX: 0000000000000000 RSI: 0000000040044620 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000140 R09: 0000000000000140
R10: 0000000000000140 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffccaf74738 R14: 00007ffccaf74540 R15: 00007ffccaf74530
 </TASK>

Crashes (24):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/12/27 20:49 linux-5.15.y d93fa2c78854 fb427a07 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2023/09/10 20:59 linux-5.15.y aff03380bda4 6654cf89 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2023/05/22 04:27 linux-5.15.y 9d6bde853685 4bce1a3e .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2023/03/31 08:09 linux-5.15.y c957cbb87315 f325deb0 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2025/10/27 01:43 linux-5.15.y ac56c046adf4 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2024/12/01 17:00 linux-5.15.y 0a51d2d4527b 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2024/11/24 10:32 linux-5.15.y 0a51d2d4527b 68da6d95 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2024/07/01 03:05 linux-5.15.y 4878aadf2d15 757f06b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2024/05/18 04:30 linux-5.15.y 83655231580b c0f1611a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2024/03/05 12:25 linux-5.15.y 80efc6265290 5fc53669 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2024/02/22 23:12 linux-5.15.y 6139f2a02fe0 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2024/02/12 06:08 linux-5.15.y 6139f2a02fe0 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2024/02/01 03:39 linux-5.15.y 6139f2a02fe0 373b66cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2024/01/23 13:06 linux-5.15.y ddcaf4999061 1c0ecc51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2024/01/16 10:10 linux-5.15.y ddcaf4999061 2a7bcc7f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2024/01/07 01:36 linux-5.15.y 26c690eff0a5 d0304e9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2024/01/01 22:55 linux-5.15.y d93fa2c78854 fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2023/12/27 05:20 linux-5.15.y d93fa2c78854 fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2023/11/21 06:48 linux-5.15.y 2a910f4af54d cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2023/11/17 13:02 linux-5.15.y 80529b4968a8 cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2023/10/06 09:03 linux-5.15.y b911329317b4 db17ad9f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2023/09/09 20:35 linux-5.15.y aff03380bda4 6654cf89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2023/09/08 17:21 linux-5.15.y aff03380bda4 6654cf89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
2023/03/31 07:04 linux-5.15.y c957cbb87315 f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drm_wait_one_vblank
* Struck through repros no longer work on HEAD.