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

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Date: Mon, 26 Feb 2024 10:37:15 +0800
From: Lizhi Xu <lizhi.xu@...driver.com>
To: <syzbot+93bd128a383695391534@...kaller.appspotmail.com>
CC: <syzkaller-bugs@...glegroups.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [syzbot] [dri?] WARNING in vkms_get_vblank_timestamp (2)

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git v6.8

diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
index 61e500b8c9da..ae31e000dce2 100644
--- a/drivers/gpu/drm/vkms/vkms_crtc.c
+++ b/drivers/gpu/drm/vkms/vkms_crtc.c
@@ -100,7 +100,7 @@ static bool vkms_get_vblank_timestamp(struct drm_crtc *crtc,
 
 	*vblank_time = READ_ONCE(output->vblank_hrtimer.node.expires);
 
-	if (WARN_ON(*vblank_time == vblank->time))
+	if (WARN_ON(in_vblank_irq && *vblank_time == vblank->time))
 		return true;
 
 	/*