From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out30-119.freemail.mail.aliyun.com (out30-119.freemail.mail.aliyun.com [115.124.30.119]) (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 637D7C8E9; Tue, 18 Jun 2024 01:28:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.119 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718674105; cv=none; b=VO2cZhq9feAHBz3nMZelo+8MraXS+BpzFQojxxRrijQKuslNQWPG+J9BzCBS92dsE8VdEfa6ng8SphRjojCQNF8lwudI4C3XJujNSZpoxagRZllIcmBO/vW55IDNNGvRBcLWo3qW1Plxeqc/zoKXlD+6tEMH2HQ4fdQ0vli/1hg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718674105; c=relaxed/simple; bh=NWWIyOvvwEm8OqF1u2GbyLpt/eCbcYgMTuV8ijj0Sso=; h=Message-ID:Subject:Date:From:To:Cc:References:In-Reply-To; b=pr5E0MDOSMu/BQYvsSJeqUdsihq0ZKEnn91qngfawTSbj4dvMu89cM42sFSuxS1uYSEy/5hEHArPI66efig5cV2XlaelN2v6p843c544K/yucMWhJrpXauf0ypWTTnddgxdop6hqUrU4uKF4zFOW7AQk4j51Dq6WwwkBDACivbI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=XmthzBcD; arc=none smtp.client-ip=115.124.30.119 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="XmthzBcD" DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1718674099; h=Message-ID:Subject:Date:From:To; bh=gC4s7CnM7P3cGUsD+zh1/ZpFsTnWxtbKTh5j1NrbJfY=; b=XmthzBcDn29iy3D9FmBMDOJwz7DXxpluxH56E/PV/9IoYYzzTh1lztgJFsmZQAecx9kxf5RfuryBuYkSexfTdnR9b+KPao20xZnWA3TBtFZkMgYsaxUu/dMosZmvxqxotE8sLEwwhRUWzKM78n61vZxQkbs0qdocTwP3tJdvigg= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R361e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033032014031;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=13;SR=0;TI=SMTPD_---0W8hwW80_1718674097; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0W8hwW80_1718674097) by smtp.aliyun-inc.com; Tue, 18 Jun 2024 09:28:18 +0800 Message-ID: <1718674059.0143738-1-xuanzhuo@linux.alibaba.com> Subject: Re: [syzbot] [net?] [virt?] upstream test error: KMSAN: uninit-value in receive_buf Date: Tue, 18 Jun 2024 09:27:39 +0800 From: Xuan Zhuo To: Tetsuo Handa Cc: syzbot , davem@davemloft.net, edumazet@google.com, eperezma@redhat.com, linux-kernel@vger.kernel.org, mst@redhat.com, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, virtualization@lists.linux.dev, Jason Wang , Jakub Kicinski References: <000000000000d10c260619498c25@google.com> <4ffb1d55-acfd-4647-a4d7-f227a6ad21ea@I-love.SAKURA.ne.jp> In-Reply-To: <4ffb1d55-acfd-4647-a4d7-f227a6ad21ea@I-love.SAKURA.ne.jp> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: On Mon, 17 Jun 2024 16:15:54 +0900, Tetsuo Handa wrote: > Bisection reached commit f9dac92ba908 ("virtio_ring: enable premapped mode > whatever use_dma_api"). > > On 2024/05/26 1:12, syzbot wrote: > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: 56fb6f92854f Merge tag 'drm-next-2024-05-25' of https://gi.. > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=157a5462980000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=1b6c22bca89a3565 > > dashboard link: https://syzkaller.appspot.com/bug?extid=799fbb6d9e02a7a1d62b > > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/39a256e13faa/disk-56fb6f92.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/d4ecc47a8198/vmlinux-56fb6f92.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/0d37bfdfb0ca/bzImage-56fb6f92.xz > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+799fbb6d9e02a7a1d62b@syzkaller.appspotmail.com > Maybe this patch can fix this issue: http://lore.kernel.org/all/20240606111345.93600-1-xuanzhuo@linux.alibaba.com Thanks.