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[2a03:2880:31ff:75::face:b00c]) by smtp.gmail.com with ESMTPSA id ku17-20020a170907789100b00a32fb8e79e1sm423912ejc.65.2024.01.26.01.34.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Jan 2024 01:34:08 -0800 (PST) Date: Fri, 26 Jan 2024 01:34:06 -0800 From: Breno Leitao To: Andrew Morton Cc: syzbot , 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: References: <00000000000063895c060fd59596@google.com> <20240126012540.045d8521de02fab64f3cbf78@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240126012540.045d8521de02fab64f3cbf78@linux-foundation.org> X-Rspamd-Queue-Id: 0925818001A X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: jogmkwnzmnzcf75zdepqqm7k4miskmx7 X-HE-Tag: 1706261650-382228 X-HE-Meta: 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 vQMg00XG 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Jan 26, 2024 at 01:25:40AM -0800, Andrew Morton wrote: > 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 > Thanks Andrew. Let me investigate it. I post as I find what's wrong.