Re: [syzbot] [dri?] WARNING in vkms_get_vblank_timestamp (2)

[Hillf Danton]

On Thu, 01 Feb 2024 16:13:40 -0800
> HEAD commit:    6764c317b6bb Merge tag 'scsi-fixes' of git://git.kernel.or..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=102774b7e80000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  master

--- x/drivers/gpu/drm/drm_vblank.c
+++ y/drivers/gpu/drm/drm_vblank.c
@@ -276,7 +276,7 @@ static void drm_update_vblank_count(stru
 	struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
 	u32 cur_vblank, diff;
 	bool rc;
-	ktime_t t_vblank;
+	ktime_t t_vblank = 128;
 	int count = DRM_TIMESTAMP_MAXRETRIES;
 	int framedur_ns = vblank->framedur_ns;
 	u32 max_vblank_count = drm_max_vblank_count(dev, pipe);
--