syzbot

WARNING: CPU: 1 PID: 5098 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x1d2/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:103
Modules linked in:
CPU: 1 PID: 5098 Comm: syz-executor365 Not tainted 6.8.0-syzkaller-08073-g480e035fc4c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:vkms_get_vblank_timestamp+0x1d2/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:103
Code: 00 74 08 48 89 ef e8 6d 69 22 fc 48 89 5d 00 b0 01 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 3f 19 bf fb 90 <0f> 0b 90 eb e0 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 74 fe ff ff 48
RSP: 0018:ffffc900039ff5a0 EFLAGS: 00010093
RAX: ffffffff85d5dc11 RBX: 00000011f8e83823 RCX: ffff888022a7bc00
RDX: 0000000000000000 RSI: 00000011f8e83823 RDI: 00000011f8e83823
RBP: ffffc900039ff670 R08: ffffffff85d5db79 R09: fffff5200073febc
R10: dffffc0000000000 R11: ffffffff85d5da40 R12: 00000011f8e83823
R13: 1ffff9200073fece R14: 0000000000000000 R15: ffff88801f810000
FS:  00005555848d3380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcb3afff100 CR3: 000000007ddb2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:867 [inline]
 drm_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:886 [inline]
 drm_update_vblank_count+0x25a/0x9c0 drivers/gpu/drm/drm_vblank.c:298
 drm_vblank_disable_and_save+0xee/0x3b0 drivers/gpu/drm/drm_vblank.c:467
 drm_crtc_vblank_off+0x34a/0x990 drivers/gpu/drm/drm_vblank.c:1351
 disable_outputs drivers/gpu/drm/drm_atomic_helper.c:1213 [inline]
 drm_atomic_helper_commit_modeset_disables+0xcff/0x1a10 drivers/gpu/drm/drm_atomic_helper.c:1417
 vkms_atomic_commit_tail+0x50/0x200 drivers/gpu/drm/vkms/vkms_drv.c:71
 commit_tail+0x2a9/0x3c0 drivers/gpu/drm/drm_atomic_helper.c:1832
 drm_atomic_helper_commit+0x953/0x9f0 drivers/gpu/drm/drm_atomic_helper.c:2072
 drm_atomic_commit+0x2ac/0x310 drivers/gpu/drm/drm_atomic.c:1514
 drm_client_modeset_commit_atomic+0x676/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1051
 drm_client_modeset_commit_locked+0xe0/0x520 drivers/gpu/drm/drm_client_modeset.c:1154
 drm_client_modeset_commit+0x4a/0x70 drivers/gpu/drm/drm_client_modeset.c:1180
 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:251 [inline]
 drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:278 [inline]
 drm_fb_helper_lastclose+0xbb/0x180 drivers/gpu/drm/drm_fb_helper.c:2005
 drm_fbdev_generic_client_restore+0x34/0x40 drivers/gpu/drm/drm_fbdev_generic.c:258
 drm_client_dev_restore+0x132/0x270 drivers/gpu/drm/drm_client.c:247
 drm_lastclose drivers/gpu/drm/drm_file.c:406 [inline]
 drm_release+0x47c/0x560 drivers/gpu/drm/drm_file.c:437
 __fput+0x429/0x8a0 fs/file_table.c:422
 __do_sys_close fs/open.c:1556 [inline]
 __se_sys_close fs/open.c:1541 [inline]
 __x64_sys_close+0x7f/0x110 fs/open.c:1541
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7fcb3af86200
Code: ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 80 3d c1 9e 07 00 00 74 17 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c
RSP: 002b:00007fcb3b117d68 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007fcb3af86200
RDX: 0000000020000400 RSI: 00000000c06864a2 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fcb3b117d8c
R13: 00007fcb3b117da0 R14: 00007fcb3b117de0 R15: 0000000000000001
 </TASK>