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Tue, 25 Jul 2023 23:57:23 -0700 (PDT) Date: Tue, 25 Jul 2023 23:57:22 -0700 In-Reply-To: <000000000000607ff905ffc8e477@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000000aeb7f06015e5cbd@google.com> Subject: Re: [syzbot] [mm?] WARNING: suspicious RCU usage in mas_walk (2) From: syzbot To: akpm@linux-foundation.org, liam.howlett@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, willy@infradead.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 0018640005 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: ysk1zgsur9zxed76c5rw1mu7skh6d1ys X-HE-Tag: 1690354643-949025 X-HE-Meta: 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 aUknr/dR 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 VUPlvR6G mS7s8nTeNr2qFX+RiH0Uu86GWkonWmId4I+Vjs9NpLtrYGZsmjmeAG2Nq9db5tPVxwX4+uZnX1eE2sY62H876cAWyvRcxnlPuK7GbGD9eYgQ7mRyDvclG/DoVbQGYQLYIH9KSEBPUubLHZaZKISGXZTbC+n8oSU1 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: syzbot has bisected this issue to: commit a52f58b34afe095ebc5823684eb264404dad6f7b Author: Matthew Wilcox (Oracle) Date: Mon Jul 24 18:54:10 2023 +0000 mm: handle faults that merely update the accessed bit under the VMA lock bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1783585ea80000 start commit: [unknown] git tree: linux-next final oops: https://syzkaller.appspot.com/x/report.txt?x=1443585ea80000 console output: https://syzkaller.appspot.com/x/log.txt?x=1043585ea80000 kernel config: https://syzkaller.appspot.com/x/.config?x=f481ab36ce878b84 dashboard link: https://syzkaller.appspot.com/bug?extid=8645fe63c4d22c8d27b8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1697cec9a80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1566986ea80000 Reported-by: syzbot+8645fe63c4d22c8d27b8@syzkaller.appspotmail.com Fixes: a52f58b34afe ("mm: handle faults that merely update the accessed bit under the VMA lock") For information about bisection process see: https://goo.gl/tpsmEJ#bisection