From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE365C197A0 for ; Fri, 17 Nov 2023 01:25:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345628AbjKQBZK (ORCPT ); Thu, 16 Nov 2023 20:25:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54784 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345553AbjKQBZJ (ORCPT ); Thu, 16 Nov 2023 20:25:09 -0500 Received: from mail-pg1-f198.google.com (mail-pg1-f198.google.com [209.85.215.198]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0A32E182 for ; Thu, 16 Nov 2023 17:25:06 -0800 (PST) Received: by mail-pg1-f198.google.com with SMTP id 41be03b00d2f7-5bd26ef66d1so2176343a12.2 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=MTg2DYCW9LP3/TTzRPYOygmlRj7XmUadR39S3aUkCIBaC9Etv4hiViex+YCWlgDSV/ dsdj34TgaKhQaMUIRP7K0Ds8JhfIoO2Lc9v5ZrZibZK9o2oTepY8aWwxER6Pz2BXk8GB cQgv5IhSoIDoB+TnlTJeGe1XwXUOgoqv7/YRGwgqx0WxnULt9kTZZ9hT9iPH1iLsGsA2 Hb/H4NeVdNB3mJSeYXAD0KOBYMlTSkHNS/P/n94Nw3itU1UfJ0yzAY0snG2lecLVOF+G Tm55WKfjjaTdAbXb3WJxUn74zFSyTBFNolJVZ9ioOWfh5ZTfBH1ct9gFBruNYK8kRDTi 0m6A== X-Gm-Message-State: AOJu0YynX3eAEJ9CJOvnwKaM63W+eN5sLZPnFVsunhqvQE9VhfDnsku7 PtSYvoetcIYCHzGDNna2L4cgBOKGd1BkwURn2SzASRhsPPSN X-Google-Smtp-Source: AGHT+IEZQ7oXyxiWxmK+3mMIwuVi6kepyoGWFMrMJQaY2uJPqBt2+V4JzH085Nym1mQ8E5BzfIOpvnSSsyjKyBqYg+qJJuLDlN0A 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" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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