From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-178.mta0.migadu.com (out-178.mta0.migadu.com [91.218.175.178]) (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 563713FE2E for ; Wed, 3 Apr 2024 03:59:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712116764; cv=none; b=PNIwwMscLN84wAsKw7qtGZ1T21PwMGAlka1hXWe43yZ7bgn9RT4/i4S6WteahV5mqr8h2TPy2swWXdvGVYRCkLuaQVIsJOgLufPk9PFyP/81LD74eG1VbbX+vo/k7yUUdumlTWwy0Mx/YdIWT2EwNJajZtmnpUmfDIpyy4rGOlM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712116764; c=relaxed/simple; bh=F4+Sg28rLD4dddq8PCOLJyguSpotNbjvEH897YBL8uM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=DlDy9YPGD5qtEP/+3PUbkpYGGa6kLvAGijilxrxm90Ig6zCGdup3284YBhUSTWbMlYA+kM9jp4fAQouh3ALiAeGswoRZJJRpHa3KM9XLVLmetUl2nMXkIWYNnYnemwYE/7RJigBl2tQ9IkpBRb0PNHOCdd4c9rc6PdoMgGyAzYE= 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=DYocQscY; arc=none smtp.client-ip=91.218.175.178 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="DYocQscY" Message-ID: <02d29315-13ee-45c1-984e-13c98e88247b@linux.dev> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1712116761; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=F4+Sg28rLD4dddq8PCOLJyguSpotNbjvEH897YBL8uM=; b=DYocQscYzrpszaBpRxEF4Fi4EaJPuxRGhiEoTyxA5roakT4BEyoSWtzKg9B88SPrG5PWXI ralqMy4jiGZmunp6uYqAG5gOuVDwErS0J+c8YsloGXZqvp5ypwLpwdVHTSVidM7w/D1KIw BZYrbskEWSDibawJ7bWs+YvgQ2kgzhs= Date: Tue, 2 Apr 2024 20:59:10 -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: Aleksandr Nogikh , Alexander Potapenko Cc: 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> <2ee098ec-a46f-44fa-8719-049331c4c206@linux.dev> X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Yonghong Song In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT On 4/1/24 11:36 PM, Aleksandr Nogikh wrote: > Hi, > > On Mon, Apr 1, 2024 at 8:55 PM Yonghong Song wrote: >> >> On 3/26/24 12:00 PM, syzbot wrote: >>> Hello, >>> >>> syzbot found the following issue on: >>> >>> ===================================================== >>> 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? >> > Does the kernel print any specific errors to the serial console while > booting? Or nothing at all? In my case, nothing at all. >