From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp153-170.sina.com.cn (smtp153-170.sina.com.cn [61.135.153.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9668A168BD for ; Sun, 31 Aug 2025 05:54:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=61.135.153.170 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756619673; cv=none; b=NimH7uZjhFCeywLlqeubCB4B+0CuLgWBLY4eASAiAE+6VXJtfcS3Y953aRWshuILhADzwlziNuHdXCZjhBAjMyg8hBuOxXJX6btTm3h1y8ZO/SrWQZGdja4SLMI58rEb6fLNnrAU9dW18N5Evwof2L0dEYgsTfG4QfnqGKjCPnA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756619673; c=relaxed/simple; bh=1gKGU80sVeH2ymc3lkeDcPWdrj5ARQCinAUBXIHq+ro=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Lziosdib61wI2D8A3FuXKb4aOuMnXhiYT2Tq8GeMyv5XTL2PSFclR7oG2C0t8Qnc7u5uzO9fth6mYpOCWyPg9LsiSA4ZLjzPgLV/CuFb5cAf5x6NXhEGzmYcWz4mz8dpgNt+8SBR5rQ2asgJ4O9KIRdVHT8GNY9neRyTwiO6SA8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b=r0jntuYR; arc=none smtp.client-ip=61.135.153.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b="r0jntuYR" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1756619663; bh=1Go6r1pPVA1kb1vlFEdGxvvy7m6v9fkC3gXKtCoVb+s=; h=From:Subject:Date:Message-ID; b=r0jntuYRznupXn39e26FaLHvf0Rhd00Fhe5m2VLiXQEVYuLuz2E/gcvrAw2D8IOm0 3C0rD0P68I9KcpLym9E7qNtEEEWI98hZt7wSj2cbBb1BhrQ5G6BM7FTrGAW+G6Ev56 i3ZQoaeq5hOoFsz3zyLrYGJrVEUefgZyv106MghM= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([114.249.58.236]) by sina.com (10.54.253.34) with ESMTP id 68B3E382000039D6; Sun, 31 Aug 2025 13:54:13 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=hdanton@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=hdanton@sina.com X-SMAIL-MID: 3302026291844 X-SMAIL-UIID: 589DCAB089894068B9FDBEC06AE3E9A7-20250831-135413-1 From: Hillf Danton To: syzbot Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [net] [virt] INFO: task hung in __vhost_worker_flush Date: Sun, 31 Aug 2025 13:53:59 +0800 Message-ID: <20250831055402.6159-1-hdanton@sina.com> In-Reply-To: <68b3b1ac.a70a0220.1c57d1.028b.GAE@google.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit > Date: Sat, 30 Aug 2025 19:21:32 -0700 [thread overview] > syzbot has found a reproducer for the following issue on: > > HEAD commit: 11e7861d680c Merge tag 'for-linus' of git://git.kernel.org.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=17c5c242580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=d4703ac89d9e185a > dashboard link: https://syzkaller.appspot.com/bug?extid=7f3bbe59e8dd2328a990 > compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1671ba62580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1685aa62580000 #syz test --- x/kernel/vhost_task.c +++ y/kernel/vhost_task.c @@ -34,8 +34,10 @@ static int vhost_task_fn(void *data) if (signal_pending(current)) { struct ksignal ksig; - if (get_signal(&ksig)) + if (get_signal(&ksig)) { + vtsk->fn(vtsk->data); break; + } } /* mb paired w/ vhost_task_stop */ --