From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 717AA1C2A0 for ; Fri, 26 Jan 2024 09:25:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706261146; cv=none; b=hVjYsGH5vjMYdWJ5xmZa4dtxAuUslkN+v4/pCgSglnTMNIjrA6TbK3+/5RjZ3xiCP8X02oTgKFCDR7FDXwSBGXnHjlL4Mkuh60f3JHAESo0apYE5oOfsEAq2a31IDB1oYGyN78Nf64vObA7c5TmuXYDaKJmJowCzjDs1NWtK9ao= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706261146; c=relaxed/simple; bh=yvjK49YeH3fT+kfbLz0NUAJLqFpzOT4UcCQn3OypYTY=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=Y3nn3cJen21Rr38/xqjbTl9Q8aiLzpU9sPpDgA2Vh3IBoN0Demu1PLxgiB5a7nL46mZBmqFveAWuh6YD/fSRllnadI+ckEoVLHkvjBedw1kpX4OnHyUCEbz/fNdR/no6VD9jeMJp8HttbK6L7v1nzKUnZDNfZRqf1UkksOqbX/s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=BW7p7oIl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="BW7p7oIl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0A972C433C7; Fri, 26 Jan 2024 09:25:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1706261145; bh=yvjK49YeH3fT+kfbLz0NUAJLqFpzOT4UcCQn3OypYTY=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=BW7p7oIloxclVlzTOx02Tv3FlLG1rxtCEqNHs7+Wh9/qOFES7N0VySaCmlvUEuU41 MSh+XMDZ/Xzn0vrQCyZsSqiseKOJRF3Anbak14KAutEmVByDBc/cmwGZkQkJPrAYbS jADOTnxPtNlotmJD8nqKVDQs/iD5F4YV9fZs0qfs= Date: Fri, 26 Jan 2024 01:25:40 -0800 From: Andrew Morton To: syzbot Cc: leitao@debian.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, muchun.song@linux.dev, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [mm?] possible deadlock in __unmap_hugepage_range Message-Id: <20240126012540.045d8521de02fab64f3cbf78@linux-foundation.org> In-Reply-To: <00000000000063895c060fd59596@google.com> References: <00000000000063895c060fd59596@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) 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=US-ASCII Content-Transfer-Encoding: 7bit On Fri, 26 Jan 2024 01:04:29 -0800 syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 8bf1262c53f5 Add linux-next specific files for 20240124 > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=1218a7abe80000 > kernel config: https://syzkaller.appspot.com/x/.config?x=ff4b59a824278780 > dashboard link: https://syzkaller.appspot.com/bug?extid=a1deb5533794ff31868e > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=151a9cf7e80000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=164b70cfe80000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/7696d711072d/disk-8bf1262c.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/92cd47c28072/vmlinux-8bf1262c.xz > kernel image: https://storage.googleapis.com/syzbot-assets/add5c7493418/bzImage-8bf1262c.xz > > The issue was bisected to: > > commit 947b031634e7af3d265275c26ec17e2f96fdb5a1 > Author: Breno Leitao > Date: Wed Jan 17 17:10:57 2024 +0000 > > mm/hugetlb: restore the reservation if needed Thanks. But moments after I moved this into mm.git's mm-hotfixes-stable branch, in preparation for upstreaming. I have fully dropped the patches titled mm/hugetlb: restore the reservation if needed selftests/mm: run_vmtests.sh: add hugetlb_madv_vs_map