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 BBFC9C54E76 for ; Sun, 19 Nov 2023 15:12:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231312AbjKSPML (ORCPT ); Sun, 19 Nov 2023 10:12:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52930 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230027AbjKSPMK (ORCPT ); Sun, 19 Nov 2023 10:12:10 -0500 Received: from mail-pf1-x42e.google.com (mail-pf1-x42e.google.com [IPv6:2607:f8b0:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1AD0DE1; Sun, 19 Nov 2023 07:12:07 -0800 (PST) Received: by mail-pf1-x42e.google.com with SMTP id d2e1a72fcca58-6cb74a527ceso240163b3a.2; Sun, 19 Nov 2023 07:12:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1700406726; x=1701011526; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:from:to:cc:subject:date:message-id :reply-to; bh=8EfKg+k4QXRL17tUiAU7LC5pyd3fy5K8isFLVnQcD7w=; b=dmtFKq+jZcJpnPfkSe1PXQ0ugDsFqnUZxwQx+4ekEOr1qD3gLZ9Vr9rGbiHGAtVH8X C090A1Cp0HAwNsSh7nAarA2TTsRYGk3F6GJvKdTr/nL06lRngWzZ4Ig+C6z0OP8gGuf2 1VphekuV/hZFKyslv1Czd06LDRE7YfqFtG3L+HcqZu+OxI/2UuIEYBUzzgCMvYbB7aov d0n/Y/owHq79zShE/K18fPitRgDR+fOZ44GXuZ/6lWxnmYFqFKV9w/lgZuH/IHhyoH5p qo8pAUbeCdELHbWxBfqka9MQqn5sHCEAo0wCk2bAhYzofwzYcxoBYrL2RoKAeVIFoNen jR/w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700406726; x=1701011526; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=8EfKg+k4QXRL17tUiAU7LC5pyd3fy5K8isFLVnQcD7w=; b=Zcmge/JaETPw74VQ0OsmlhmqM6D/eq+d82ZW//CdT0sabBd4J7pKEZ/+O/V+GP54ZH oLgsawne6M9JIX84bygsvpynv1DHBwJgqPrYU64H9Q/1Y5bZQODblNS7U+rdvGPbbE80 CxeXQmYFPeGggpK43nGMJjZMrfRb2RafZZuLzqOf/xmptEqkTrhVhay7pTj4dinnRaDL ofIueT1QyJGr5HIBUauE3KYv1PKCxDj4P59l3PFoMOZ9RJAk5FbZYuJ41PWG0bkbo7KI 5S04a/vuIMEueuzxRuPMcuaWX2cE+cgPrxv020MkKiguT3S4CTWVjPN2LgFbLeu5Bbny yd/Q== X-Gm-Message-State: AOJu0Yxe/jacuppVha4cjGQ/GneI6xSC6elEsizYzvL+NsyuuEeGXsHK SO1dw5HaK+QbTl/1Dt7kaP4= X-Google-Smtp-Source: AGHT+IGh5ysb2zBhFrgP4U+InFADY6GOsfaeTyqut6gkNtKaowLrmsgaAc4wNSKRcUjW5I0K14W/NA== X-Received: by 2002:a05:6a20:6a0b:b0:187:b2a7:c6cd with SMTP id p11-20020a056a206a0b00b00187b2a7c6cdmr3685940pzk.57.1700406726359; Sun, 19 Nov 2023 07:12:06 -0800 (PST) Received: from localhost (dhcp-72-253-202-210.hawaiiantel.net. [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> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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