linux-kernel - Re: [syzbot] [dri?] WARNING in vkms_get_vblank

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Message-Id: <20240208003607.1129-1-hdanton@sina.com>
Date: Thu,  8 Feb 2024 08:36:07 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+93bd128a383695391534@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [dri?] WARNING in vkms_get_vblank_timestamp (2)

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);
--