syzbot


WARNING in drm_wait_one_vblank

Status: upstream: reported C repro on 2023/04/05 12:39
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+6e0b86e99fb5d6cdc18c@syzkaller.appspotmail.com
First crash: 411d, last: 13d
Bug presence (1)
Date Name Commit Repro Result
2023/05/24 upstream (ToT) 9d646009f65d C [report] WARNING in drm_wait_one_vblank
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in drm_wait_one_vblank dri C error inconclusive 375 109d 1111d 0/26 auto-obsoleted due to no activity on 2024/04/11 15:51
linux-5.15 WARNING in drm_wait_one_vblank origin:upstream C 20 2d18h 416d 0/3 upstream: reported C repro on 2023/03/31 07:06
Fix bisection attempts (7)
Created Duration User Patch Repo Result
2024/05/07 11:37 1h22m bisect fix linux-6.1.y job log (0) log
2024/04/02 23:15 2h38m bisect fix linux-6.1.y job log (0) log
2024/03/03 13:15 2h04m bisect fix linux-6.1.y job log (0) log
2024/01/25 15:24 3h05m bisect fix linux-6.1.y job log (0) log
2023/12/25 12:31 1h23m bisect fix linux-6.1.y job log (0) log
2023/11/24 12:33 2h05m bisect fix linux-6.1.y job log (0) log
2023/09/21 22:00 1h30m bisect fix linux-6.1.y job log (0) log

Sample crash report:
WARNING: CPU: 0 PID: 3554 at drivers/gpu/drm/drm_vblank.c:1269 drm_wait_one_vblank+0x958/0x9d0 drivers/gpu/drm/drm_vblank.c:1269
Modules linked in:

CPU: 0 PID: 3554 Comm: syz-executor137 Not tainted 6.1.55-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
RIP: 0010:drm_wait_one_vblank+0x958/0x9d0 drivers/gpu/drm/drm_vblank.c:1269
Code: df 80 3c 08 00 74 08 4c 89 ff e8 e3 14 1a fd 49 8b 1f 48 c7 c7 80 19 4f 8b 4c 89 f6 48 89 da 8b 5c 24 0c 89 d9 e8 f8 ea 8a 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:ffffc90003b3fac0 EFLAGS: 00010246

RAX: 3eed908c05e9b200 RBX: 0000000000000000 RCX: ffff8880774a0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003b3fc00 R08: ffffffff81526ece R09: fffffbfff2092e4f
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000767f64
R13: 0000000000000aea R14: ffffffff8b5ff460 R15: ffff88801ff0c010
FS:  000055555613e380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 0000000021296000 CR4: 00000000003506f0
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:1267
 do_fb_ioctl+0x1d3/0x850 drivers/video/fbdev/core/fbmem.c:1190
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856
 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+0x63/0xcd
RIP: 0033:0x7f92c2155e29
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:00007ffc1f3f5f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffc1f3f5f60 RCX: 00007f92c2155e29
RDX: 0000000000000000 RSI: 0000000040044620 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000140 R09: 0000000000000140
R10: 0000000000000140 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc1f3f6178 R14: 00007ffc1f3f5f80 R15: 00007ffc1f3f5f70
 </TASK>

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/09/26 23:26 linux-6.1.y d23900f974e0 0b6a67ac .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in drm_wait_one_vblank
2023/05/24 12:30 linux-6.1.y fa74641fb6b9 4bce1a3e .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in drm_wait_one_vblank
2023/10/21 08:08 linux-6.1.y 7d24402875c7 361b23dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in drm_wait_one_vblank
2023/09/26 16:38 linux-6.1.y d23900f974e0 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in drm_wait_one_vblank
2023/07/10 07:41 linux-6.1.y 61fd484b2cf6 668cb1fa .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in drm_wait_one_vblank
2023/06/24 05:03 linux-6.1.y e84a4e368abe 79782afc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in drm_wait_one_vblank
2023/04/22 10:29 linux-6.1.y f17b0ab65d17 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in drm_wait_one_vblank
2023/04/05 12:39 linux-6.1.y 3b29299e5f60 831373d3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in drm_wait_one_vblank
* Struck through repros no longer work on HEAD.