------------[ cut here ]------------ WARNING: CPU: 3 PID: 31898 at drivers/gpu/drm/vkms/vkms_crtc.c:98 vkms_get_vblank_timestamp+0x185/0x1e0 drivers/gpu/drm/vkms/vkms_crtc.c:98 Modules linked in: CPU: 3 UID: 0 PID: 31898 Comm: syz.8.7706 Not tainted 6.12.0-syzkaller-07749-g28eb75e178d3 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:vkms_get_vblank_timestamp+0x185/0x1e0 drivers/gpu/drm/vkms/vkms_crtc.c:98 Code: eb fb e8 1e c4 d9 fb 48 89 e9 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 11 00 75 50 48 89 45 00 eb c0 e8 ec db eb fb 90 <0f> 0b 90 eb b5 e8 c1 6b 4e fc e9 dc fe ff ff 48 89 df e8 44 6c 4e RSP: 0018:ffffc900038cf630 EFLAGS: 00010287 RAX: 0000000000000d2b RBX: 000000faac3dcc7c RCX: ffffc90034230000 RDX: 0000000000080000 RSI: ffffffff85a18c54 RDI: 0000000000000006 RBP: ffffc900038cf798 R08: 0000000000000006 R09: 000000faac3dcc7c R10: 000000faac3dcc7c R11: 0000000000000000 R12: 000000faac3dcc7c R13: ffff888022310000 R14: 0000000000004e20 R15: ffffffff85a18ad0 FS: 0000000000000000(0000) GS:ffff88802b700000(0063) knlGS:00000000f5115b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000002c30bff8 CR3: 0000000078d7e000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: drm_crtc_get_last_vbltimestamp+0x103/0x1b0 drivers/gpu/drm/drm_vblank.c:878 drm_crtc_next_vblank_start+0x182/0x300 drivers/gpu/drm/drm_vblank.c:1012 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1558 [inline] drm_atomic_helper_wait_for_fences+0x1fc/0x820 drivers/gpu/drm/drm_atomic_helper.c:1605 drm_atomic_helper_commit+0x1cf/0x380 drivers/gpu/drm/drm_atomic_helper.c:2034 drm_atomic_commit+0x232/0x300 drivers/gpu/drm/drm_atomic.c:1518 drm_atomic_connector_commit_dpms+0x36b/0x4a0 drivers/gpu/drm/drm_atomic_uapi.c:984 set_property_atomic+0x234/0x380 drivers/gpu/drm/drm_mode_object.c:539 drm_mode_obj_set_property_ioctl+0x411/0x5c0 drivers/gpu/drm/drm_mode_object.c:586 drm_connector_property_set_ioctl+0x103/0x170 drivers/gpu/drm/drm_connector.c:3094 drm_ioctl_kernel+0x1e6/0x3d0 drivers/gpu/drm/drm_ioctl.c:796 drm_ioctl+0x57e/0xba0 drivers/gpu/drm/drm_ioctl.c:893 drm_compat_ioctl+0x327/0x460 drivers/gpu/drm/drm_ioc32.c:379 __do_compat_sys_ioctl+0x1cb/0x2c0 fs/ioctl.c:1004 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7fb0579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f511555c EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000000000a RCX: 00000000c01064ab RDX: 0000000020000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi