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From: Edward Adam Davis <eadavis@sina.com>
To: syzbot+cba1a1f459230395a076@syzkaller.appspotmail.com
Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [media?] [dri?] kernel BUG in sync_timeline_signal
Date: Thu,  5 Nov 2026 13:16:37 +0800	[thread overview]
Message-ID: <20261105051637.54502-1-eadavis@sina.com> (raw)
In-Reply-To: <6aead2eb.3c6f2eba.20048d.0000.GAE@google.com>

From: Edward Aadm Davis <eadavis@sina.com>

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 6628e7d4c6b2

diff --git a/drivers/dma-buf/sw_sync.c b/drivers/dma-buf/sw_sync.c
index 8df20b0218a9..6b37c52d4198 100644
--- a/drivers/dma-buf/sw_sync.c
+++ b/drivers/dma-buf/sw_sync.c
@@ -221,7 +221,11 @@ static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc)
 		if (!timeline_fence_signaled(&pt->base))
 			break;
 
-		dma_fence_get(&pt->base);
+		if (!dma_fence_get_rcu(&pt->base)) {
+			list_del_init(&pt->link);
+			rb_erase(&pt->node, &obj->pt_tree);
+			continue;
+		}
 
 		list_move_tail(&pt->link, &signalled);
 		rb_erase(&pt->node, &obj->pt_tree);

  parent reply	other threads:[~2026-11-05  5:16 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-11-04  6:38 syzbot
2026-11-05  3:31 ` Edward Adam Davis
2026-11-05  3:31   ` syzbot
2026-11-05  3:34 ` Edward Adam Davis
2026-11-05  5:44   ` syzbot
2026-11-05  4:14 ` [PATCH] dma-buf/sw_sync: Optimize the retrieval of fence reference counts Edward Adam Davis
2026-11-05  5:16 ` Edward Adam Davis [this message]
2026-11-05  5:58   ` [syzbot] [media?] [dri?] kernel BUG in sync_timeline_signal syzbot

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