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[72.253.202.210]) by smtp.gmail.com with ESMTPSA id x19-20020a62fb13000000b006870ed427b2sm4532387pfm.94.2023.11.19.07.12.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 19 Nov 2023 07:12:05 -0800 (PST) Sender: Tejun Heo Date: Sun, 19 Nov 2023 05:12:04 -1000 From: Tejun Heo To: syzbot Cc: boqun.feng@gmail.com, brauner@kernel.org, cgroups@vger.kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, lizefan.x@bytedance.com, longman@redhat.com, michael.christie@oracle.com, mingo@redhat.com, mst@redhat.com, oleg@redhat.com, peterz@infradead.org, syzkaller-bugs@googlegroups.com, wander@redhat.com, will@kernel.org Subject: Re: [syzbot] [cgroups?] possible deadlock in cgroup_free Message-ID: References: <000000000000f5b0d0060a430995@google.com> <0000000000009642b4060a4f017f@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0000000000009642b4060a4f017f@google.com> X-Spam-Status: No, score=-1.0 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on groat.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (groat.vger.email [0.0.0.0]); Sun, 19 Nov 2023 07:12:22 -0800 (PST) On Thu, Nov 16, 2023 at 05:25:05PM -0800, syzbot wrote: > syzbot has bisected this issue to: > > commit 2d25a889601d2fbc87ec79b30ea315820f874b78 > Author: Peter Zijlstra > Date: Sun Sep 17 11:24:21 2023 +0000 > > ptrace: Convert ptrace_attach() to use lock guards Looks like the tasklist_lock conversion in ptrace_attach() forgot _irq. Peter, Oleg? Thanks. -- tejun