From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; dkim=none Received: from mail-pl1-f200.google.com (mail-pl1-f200.google.com [209.85.214.200]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 091A0129 for ; Thu, 16 Nov 2023 17:25:06 -0800 (PST) Received: by mail-pl1-f200.google.com with SMTP id d9443c01a7336-1ce5d31e709so3857955ad.3 for ; Thu, 16 Nov 2023 17:25:06 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700184305; x=1700789105; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=RJo6nMVJndBB899kUvGypW1akG0rhdJo5ej1y6RnVs8=; b=rzGGeT0pVBxgHoCavI2dDdWbk6hdpschqjvRE41yXjJSeEizmqzNj1zXPsVzMiVtd2 ZzlN5/4Ypjweu7ixXl/8V7tAtDuGnCFaOX61HiPcV3/IxS8kXu4yDMydYdM69rl03Ymd d2vatzaK0m/qblEwvK5y5dXIkiS72UHY7FQ7mqETNBpjk1e4AgcmsmO1XevjI2Ux5x7y c0xsRR/lENmZU2A5b1zDjhEDP54JusSPVDNblqtcno6y4GZB2DIb+K4jH2e6eKBYc5zr olFYCk9w3dp1nBKl3UnD4YCvamYdxdkaAj/a/RuiYMUrKCHbP4rD6TaggfUICIBmyw5U lhlA== X-Gm-Message-State: AOJu0YzN+iMjsvLHi4VBXptuo6CrPnDXs2V8G0T7gyfP3SFe7ZsFxzP7 kY4HT9e0K5EFcM/pXDvVmguGZzzRN3hEde7UzKnIoRfl+Pu8 X-Google-Smtp-Source: AGHT+IEZQ7oXyxiWxmK+3mMIwuVi6kepyoGWFMrMJQaY2uJPqBt2+V4JzH085Nym1mQ8E5BzfIOpvnSSsyjKyBqYg+qJJuLDlN0A Precedence: bulk X-Mailing-List: cgroups@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a17:903:2681:b0:1ce:1892:2fb1 with SMTP id jf1-20020a170903268100b001ce18922fb1mr2611444plb.0.1700184305580; Thu, 16 Nov 2023 17:25:05 -0800 (PST) Date: Thu, 16 Nov 2023 17:25:05 -0800 In-Reply-To: <000000000000f5b0d0060a430995@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000009642b4060a4f017f@google.com> Subject: Re: [syzbot] [cgroups?] possible deadlock in cgroup_free From: syzbot To: 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, tj@kernel.org, wander@redhat.com, will@kernel.org Content-Type: text/plain; charset="UTF-8" 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 bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=130edb3f680000 start commit: f31817cbcf48 Add linux-next specific files for 20231116 git tree: linux-next final oops: https://syzkaller.appspot.com/x/report.txt?x=108edb3f680000 console output: https://syzkaller.appspot.com/x/log.txt?x=170edb3f680000 kernel config: https://syzkaller.appspot.com/x/.config?x=f59345f1d0a928c dashboard link: https://syzkaller.appspot.com/bug?extid=cef555184e66963dabc2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13fd7920e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17d80920e80000 Reported-by: syzbot+cef555184e66963dabc2@syzkaller.appspotmail.com Fixes: 2d25a889601d ("ptrace: Convert ptrace_attach() to use lock guards") For information about bisection process see: https://goo.gl/tpsmEJ#bisection