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Tue, 27 Aug 2024 20:31:02 -0700 (PDT) Date: Tue, 27 Aug 2024 20:31:02 -0700 In-Reply-To: <00000000000041df050616f6ba4e@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000c69eb60620b5fc4b@google.com> Subject: Re: [syzbot] [mm?] possible deadlock in __mmap_lock_do_trace_start_locking From: syzbot To: akpm@linux-foundation.org, axelrasmussen@google.com, cgroups@vger.kernel.org, hannes@cmpxchg.org, hawk@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, lizefan.x@bytedance.com, longman@redhat.com, mathieu.desnoyers@efficios.com, mhiramat@kernel.org, netdev@vger.kernel.org, penguin-kernel@I-love.SAKURA.ne.jp, penguin-kernel@i-love.sakura.ne.jp, rostedt@goodmis.org, syzkaller-bugs@googlegroups.com, tj@kernel.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 589D4C0013 X-Stat-Signature: tdzdf9rm7rrunwn4ze6k8p1kw8s3ons3 X-Rspam-User: X-HE-Tag: 1724815863-802971 X-HE-Meta: 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 /OroYJLE 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 ItEXUcIV n6xaYd4A6osVFCnhxrPNJpt9p1LzAppkEf/WxUfkgo43v4oxTOYEThiEShaoforOtxVyEZJ6vixIqumKlAzlsAYHYGURUceNNtUbjxJqG4DbRDJHrS3fBA== 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: syzbot suspects this issue was fixed by commit: commit 7d6be67cfdd4a53cea7147313ca13c531e3a470f Author: Tetsuo Handa Date: Fri Jun 21 01:08:41 2024 +0000 mm: mmap_lock: replace get_memcg_path_buf() with on-stack buffer bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1412f697980000 start commit: 36534d3c5453 tcp: use signed arithmetic in tcp_rtx_probe0_.. git tree: bpf kernel config: https://syzkaller.appspot.com/x/.config?x=333ebe38d43c42e2 dashboard link: https://syzkaller.appspot.com/bug?extid=6ff90931779bcdfc840c syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1585acfa980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17bdb7ee980000 If the result looks correct, please mark the issue as fixed by replying with: #syz fix: mm: mmap_lock: replace get_memcg_path_buf() with on-stack buffer For information about bisection process see: https://goo.gl/tpsmEJ#bisection