From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (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 5FD982D2496; Sun, 22 Mar 2026 02:23:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.156.1 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774146215; cv=none; b=acJk6z6ivxutosiKo4Xoa7dhiZMyPXhi0gadgpb4UwOfaQa6OFs09mO6/kLTJjNXUpDYqDvobwjnX0WPoubeMbuYst0MFFGf5jTvscPVnNQgrbFNf9AMm8AGv9rIV8qCVoYxg5j0LlH8bKJgGevilRmHVwKUjGox/n+jzPBKgLE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774146215; c=relaxed/simple; bh=4vo/h6YHVIwdKVQ/QQvJAQBHryM/N2t+N2KvHMNiMO4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=nEhEnL8NOl2DdWEGfxAKewUDOYzSqYlui2lM6td5Asq2yc1w1h05TXxBfyX8xw+9shnAJeVV/jx0IdPRnBYhrs5xYrK3e5sVNfLJsL1ieOkHacpIdCkdfmpvfVYypoYV0IiSWr1Tu82dkWDp7ipNnUGeJ2D67q1zhg+jxfuys2g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=JNguzBEo; arc=none smtp.client-ip=148.163.156.1 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="JNguzBEo" Received: from pps.filterd (m0356517.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 62LKkYJf1829803; Sun, 22 Mar 2026 02:23:23 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-type:date:from:in-reply-to:message-id:mime-version :references:subject:to; s=pp1; bh=CPvyT85aQX28/6x6P3my1KWFDq8/t1 +3vnYHDCA91ik=; b=JNguzBEoBpizWgSXo5xYtqsA9JIa6GCJqz0JVdN0/5IZLQ DV/5aTCsjI9NxPqZgtk6NRAIO+woKGCzOFEpLpX3kHOX+PCa6gfG70s4eY3nzIqR sFT4YC2MR6bDF601Pl+CKJmtpZwSBSvWYHVROml6fiKI0LTf1llZQKwFTA4fXw1I nDFqKwybhYfY7J/js822AFTjQr1dOAVqR24GxZiMlW1kl+IljnV0UuCLwi9CfccB ddsFem2Bw0cFMmWiIhqNnQ+4L8HPVW2szcplg2dk+M9oaeiNcr57QJnfzUXpcT+K OPw21FyGx8DLxiaPMMTZHpczw8BF6zJ6nrC5rxyw== Received: from ppma11.dal12v.mail.ibm.com (db.9e.1632.ip4.static.sl-reverse.com [50.22.158.219]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4d1kw9jfne-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 22 Mar 2026 02:23:23 +0000 (GMT) Received: from pps.filterd (ppma11.dal12v.mail.ibm.com [127.0.0.1]) by ppma11.dal12v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 62LMUNoM012784; Sun, 22 Mar 2026 02:23:22 GMT Received: from smtprelay06.fra02v.mail.ibm.com ([9.218.2.230]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 4cwmq1w90y-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 22 Mar 2026 02:23:22 +0000 Received: from smtpav02.fra02v.mail.ibm.com (smtpav02.fra02v.mail.ibm.com [10.20.54.101]) by smtprelay06.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 62M2NKaV30474694 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 22 Mar 2026 02:23:20 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7AB1520043; Sun, 22 Mar 2026 02:23:20 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 27D5F20040; Sun, 22 Mar 2026 02:23:20 +0000 (GMT) Received: from localhost (unknown [9.111.74.1]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTPS; Sun, 22 Mar 2026 02:23:20 +0000 (GMT) Date: Sun, 22 Mar 2026 03:23:18 +0100 From: Vasily Gorbik To: syzbot Cc: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [block?] general protection fault in bio_alloc_bioset Message-ID: References: <69bf3539.050a0220.3bf4de.006a.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <69bf3539.050a0220.3bf4de.006a.GAE@google.com> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: jje7i1mwpQZGiz087lq5f5gmwK01bU6F X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzIyMDAxNyBTYWx0ZWRfXz8j6ymP5BUos UHpwVDBAKEYo5Sy296NdCKZLNz4Sw8y/9U7waywZMfPBNuBQ0gvhpkMKYP6Ld8oHUj/7elyaEoe Wxuc+/AzWWTGEc/O3AQsGh+OuklHkwcj8yJr1oL9Go69xIJa9mAyy18PtzaI1ZDXgOeEclEtbmy 7S0/W2D/liGblcMrSxBJlcz22oyHoQIaxb0Hle24tHG/alq1FODLQOXePUoy2EN+LjtVnx4Qdtm iDCVBhzRUddNmV/5s6xVZK+BpmNi8tUObrWV8HYqXgfpSAD3HRUQISfqEoWRhOywTNzI9CGB6hf bqW1cU9NVfY2tSRjAyRbI6OMxdRl7PQ+KvX8VjBdOlOhCLn7lDl0a0hxYcqAvZFXznSIL79f4Eh vs6lG1jv+r1asW6cmRhS3nPOJZ6Dm1JTYCay8ewATa+1RCypOgPGUsflALJ94Oajo7rSPhOameZ G31wG6rB+v9LszOln6Q== X-Proofpoint-GUID: jje7i1mwpQZGiz087lq5f5gmwK01bU6F X-Authority-Analysis: v=2.4 cv=OsZCCi/t c=1 sm=1 tr=0 ts=69bf529b cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=edf1wS77AAAA:8 a=gNbmwd2WZE6oeA4uFWwA:9 a=QEXdDO2ut3YA:10 a=DcSpbTIhAlouE1Uv7lRv:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-21_08,2026-03-20_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 adultscore=0 clxscore=1015 phishscore=0 suspectscore=0 lowpriorityscore=0 priorityscore=1501 bulkscore=0 spamscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603220017 On Sat, Mar 21, 2026 at 05:18:01PM -0700, syzbot wrote: > Hello, > > syzbot has tested the proposed patch but the reproducer is still triggering an issue: > SYZFAIL: failed to recv rpc > > SYZFAIL: failed to recv rpc > fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor) > > > Tested on: > > commit: 785f0eb2 Add linux-next specific files for 20260320 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1385ccba580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=22bf3527036b9be1 > dashboard link: https://syzkaller.appspot.com/bug?extid=09ddb593eea76a158f42 > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 > patch: https://syzkaller.appspot.com/x/patch.diff?x=143881d6580000 Well, keeping in mind that the repro does ioctl$BLKTRACESETUP(r1, 0xc0481273, &(0x7f00000001c0)={'\x00', 0x1, 0x18148795, 0x7, 0x6}) that is roughly 2.6 GiB per CPU of relay buffer on an ~8 GiB VM with tiny swap. Surviving 1h15m before syzbot loses it is about as good as it gets.