From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-177.mta1.migadu.com (out-177.mta1.migadu.com [95.215.58.177]) (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 3C71E4CDE0 for ; Mon, 1 Apr 2024 18:55:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.177 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711997733; cv=none; b=WZ3z+te31BHNT4PTmd8CfHDYoFlujanpWjqV71c4Gf9BVEv4wyEnBdjovMUfixUKn3cmkMRzdFAYC+Ad83UoWuvkbnzlkQVjyBDfzrRNsOm8EQw3DbwUFVwplsg9vPtez+6uqh1+IlM89iDAHLG17u0AXegt4ID4I7jLKyGoGrg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711997733; c=relaxed/simple; bh=4SaZuBFazkBBKNpoTWiW8ROSSgI2jLrGDikbbq1uaH8=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; b=Pg8DMrhexHNgFOHY3FHeOEeyGQA80gjB1iDy+OQ03/QYoyAJIxrExWI8RrXrFQE4oacovDjj/kNaXg1EB1Yb63d5S+CaZBYovgdT/52P4/FOCBmvWznyqDcAu/RiBCktkbOEt5NY9fXhiNpBO46DcjVIEMGAFQztpl33WXojRZc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=vwRjbn/t; arc=none smtp.client-ip=95.215.58.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="vwRjbn/t" Message-ID: <2ee098ec-a46f-44fa-8719-049331c4c206@linux.dev> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1711997729; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TwaXuGDQ6zaSeml1dtFpJh0djt9NWcXU/UO1873hCxE=; b=vwRjbn/tgF4l7bk4tGLN6N7m/NhuxHgXdkJr2khWniTxEi9ZMgQ3wRvo2Dld1NlGVN98xx wtNL+XWC4XC/jCZjfi98ZDMDc16DzKXFdHWdXUdXsOgEawqPsgQ48Pn7GCndRC8Xu5Gyh8 CmAkFwHJHFPJ1iuCBLnAEhqFTXYds1A= Date: Mon, 1 Apr 2024 11:55:17 -0700 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [syzbot] [bpf?] KMSAN: uninit-value in trie_delete_elem Content-Language: en-GB To: syzbot , andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, haoluo@google.com, john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org, linux-kernel@vger.kernel.org, martin.lau@linux.dev, sdf@google.com, song@kernel.org, syzkaller-bugs@googlegroups.com References: <000000000000f9ce6d061494e694@google.com> X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Yonghong Song In-Reply-To: <000000000000f9ce6d061494e694@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT On 3/26/24 12:00 PM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 4f55aa85a874 Merge tag 'fbdev-for-6.9-rc1' of git://git.ke.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=11a8dc6e180000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e6bd769cb793b98a > dashboard link: https://syzkaller.appspot.com/bug?extid=603bcd9b0bf1d94dbb9b > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > userspace arch: i386 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/991fcbce770a/disk-4f55aa85.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/bd716e5d2c3c/vmlinux-4f55aa85.xz > kernel image: https://storage.googleapis.com/syzbot-assets/bf1151dbf5fc/bzImage-4f55aa85.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+603bcd9b0bf1d94dbb9b@syzkaller.appspotmail.com > > ===================================================== > BUG: KMSAN: uninit-value in trie_delete_elem+0xc0/0xbe0 kernel/bpf/lpm_trie.c:448 Unrelated to the bug itself, with KMSAN is enabled, qemu cannot boot my vm any more. Anything special I need to do in order to boot a KMSAN kernel?