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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) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: 86t7x9m7quuo964y4mb7d47aktasf1qg X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: E8F571C0002 X-Rspam-User: X-HE-Tag: 1706261147-300333 X-HE-Meta: U2FsdGVkX18hOf+fmsAt3DG83BApKvZRSqnoZsFEQpu0JahqNlpZ7agRzA06dZZpQLMcP4WMduQs86oIxgwM45PzEq2JbHVbvH1uMRxko99vtWBNpX1pTmcrM+zs+WmLZ1DKB3sgOwr1iJfNSbUJ/N5t13iR1kjbEdrBp5tOQHjOq/eLQZC+ZOcoiD+09KZxZStnzX30b8QMlV/o+NiB4dATWWsRnznK7WvO+2nt+EdYQcNhAqbEqq2+IUbTdlnTL4/Tusl3Jk7+l2g3iEeotWwkk9UYoMbVgUFDVPDX9nwqm/TTivfn9v9pwqcVRd3/tbZlgj0iM0qif4sRPgWOocVZt95XorhPySxssrqnLvJ4ZJC/ZSIEDig17DkAFWZnJ6czzWwfmofsQW5TNozS9zE5UIkJHu8Pp8mt4GyKg2YWf3AgE1hLyLo2TtbVC25dCDEavm7psCU8YBzR5GTSVSfdggX0Dv86sQA/VnYT0OwXlWxdOMuJSvOhlxUNzUlU0vaYVlNmdp2hpMKe9r3OPDsBCTXX0bib3Zw5rKAHkB30v/3OW2Ozh/EzvDMJHbfd+TD2CISdxXNuQ2iALJUhf0NOVCm3IqSq1mqh5wgTGv79VeOt5qJZ9eT/AWEUlgXhxy6WOJmSO2OVyMo6yoniy84tjx+AEWO/wlFujiSAUhpG1Q54Nc0DytOyTCRUzzfW5x1g4GhDPTrHWIWdDJ/kZVSpgv5UUwE6Xc4RH4Hl2U4RLgc2joR4wNI7CdZmN/TYCQIYbxhj6XD1u4gpHX/eijXq2ejF6/UmGtvd9Xuz7aQkP64pRzOvhyv/OFQgELyE29oT6eQSmZ3afimgbKSFYxZl+YNSLkPZORKEEckWV3vaz9OSf6zdjcYb1BMSFo+zYB09AcJNpwYaxS7JaKPzdhYbEACPV94R+s6nGbxeHfNj0AX6Gz5wmJJN+6GibGsCfJ7f8khRalftz/lduEb K2s8rgG6 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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, 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