syzbot has found a reproducer for the following issue on: HEAD commit: 6764c317b6bb Merge tag 'scsi-fixes' of git://git.kernel.or.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=12be3328180000 kernel config: https://syzkaller.appspot.com/x/.config?x=2c0ac5dfae6ecc58 dashboard link: https://syzkaller.appspot.com/bug?extid=93bd128a383695391534 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12067e60180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=102774b7e80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/90c636d7609b/disk-6764c317.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9d76784c4adc/vmlinux-6764c317.xz kernel image: https://storage.googleapis.com/syzbot-assets/4fa116a29660/bzImage-6764c317.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+93bd128a383695391534@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5107 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x1dc/0x250 drivers/gpu/drm/vkms/vkms_crtc.c:103 Modules linked in: CPU: 1 PID: 5107 Comm: syz-executor297 Not tainted 6.8.0-rc2-syzkaller-00055-g6764c317b6bb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:vkms_get_vblank_timestamp+0x1dc/0x250 drivers/gpu/drm/vkms/vkms_crtc.c:103 Code: 08 fc e8 a7 f4 f6 fb 4c 89 e1 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 11 00 75 67 49 89 04 24 eb c0 e8 c5 0f 08 fc 90 <0f> 0b 90 eb b5 e8 6a bf 61 fc e9 d8 fe ff ff e8 c0 bf 61 fc e9 6a RSP: 0018:ffffc9000473f5d8 EFLAGS: 00010093 RAX: 0000000000000000 RBX: 0000001a34a6b1e9 RCX: ffffffff8584597f RDX: ffff888023a30000 RSI: ffffffff858459fb RDI: 0000000000000006 RBP: ffff88801fab0000 R08: 0000000000000006 R09: 0000001a34a6b1e9 R10: 0000001a34a6b1e9 R11: 0000000000000004 R12: ffffc9000473f700 R13: 0000001a34a6b1e9 R14: 0000000000004e20 R15: ffffffff85845820 FS: 0000555555568380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000240 CR3: 0000000022742000 CR4: 0000000000350ef0 Call Trace: <TASK> drm_crtc_get_last_vbltimestamp+0x106/0x1b0 drivers/gpu/drm/drm_vblank.c:867 drm_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:886 [inline] drm_update_vblank_count+0x1b1/0x9d0 drivers/gpu/drm/drm_vblank.c:298 drm_crtc_accurate_vblank_count+0xc2/0x260 drivers/gpu/drm/drm_vblank.c:411 drm_crtc_arm_vblank_event+0xfb/0x2b0 drivers/gpu/drm/drm_vblank.c:1097 vkms_crtc_atomic_flush+0x10b/0x2b0 drivers/gpu/drm/vkms/vkms_crtc.c:258 drm_atomic_helper_commit_planes+0x61f/0x1000 drivers/gpu/drm/drm_atomic_helper.c:2820 vkms_atomic_commit_tail+0x5e/0x240 drivers/gpu/drm/vkms/vkms_drv.c:73 commit_tail+0x287/0x410 drivers/gpu/drm/drm_atomic_helper.c:1832 drm_atomic_helper_commit+0x2fd/0x380 drivers/gpu/drm/drm_atomic_helper.c:2072 drm_atomic_commit+0x20e/0x2e0 drivers/gpu/drm/drm_atomic.c:1514 drm_atomic_helper_set_config+0x141/0x1c0 drivers/gpu/drm/drm_atomic_helper.c:3271 drm_mode_setcrtc+0xd0a/0x1690 drivers/gpu/drm/drm_crtc.c:886 drm_ioctl_kernel+0x1ef/0x3e0 drivers/gpu/drm/drm_ioctl.c:744 drm_ioctl+0x5d8/0xc00 drivers/gpu/drm/drm_ioctl.c:841 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __x64_sys_ioctl+0x196/0x220 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd8/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f0d5d4bdd89 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 19 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:00007ffe26838708 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0d5d4bdd89 RDX: 0000000020000300 RSI: 00000000c06864a2 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000555555569610 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
