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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7E536C43215 for ; Fri, 22 Nov 2019 10:39:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5752B2071F for ; Fri, 22 Nov 2019 10:39:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574419150; bh=ruFM6nBCHdcOlFs3rbW4BGJ/ZQW+sZpJNoS0Qbdzh6Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=beM2f7E2ydG+E85xjtGl+kBOjKU0kd+xUWwFiGGodGxoQ1W+wArlavBB0+Z52f9DX hixBQ9rVOrdSJlQwk5EAL1u6PmMSrS1wpCjxXHYZCxF3MXnAlrxmfC4cDoaGuM6WjI 2ZKGKtDNnnBbPTWZLGgPx4+P8ivST9LTHtbntLlc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727333AbfKVKjJ (ORCPT ); Fri, 22 Nov 2019 05:39:09 -0500 Received: from mail.kernel.org ([198.145.29.99]:41934 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728749AbfKVKjG (ORCPT ); Fri, 22 Nov 2019 05:39:06 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D48CF20637; Fri, 22 Nov 2019 10:39:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574419144; bh=ruFM6nBCHdcOlFs3rbW4BGJ/ZQW+sZpJNoS0Qbdzh6Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tvgEqFiCWWUZwnrByfycGgrBApUPwb1coEyFQfGjytkGc93FukOKbNzCCS+r01FNN yQKLzjkWwGG6RWIV7lZD7lcTQZsVEarnFygrmmZGRupbWXVswCK6GuQU5vOSftDsZ6 aSccbW+2Q/HmxL6CjL1lunJ/3/cTT7bU54ymA/EA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Roman Gushchin , Johannes Weiner , Tejun Heo , Shakeel Butt , Michal Hocko , Michal Koutn , Andrew Morton , Linus Torvalds Subject: [PATCH 4.9 013/222] mm: memcg: switch to css_tryget() in get_mem_cgroup_from_mm() Date: Fri, 22 Nov 2019 11:25:53 +0100 Message-Id: <20191122100833.915522594@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191122100830.874290814@linuxfoundation.org> References: <20191122100830.874290814@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Roman Gushchin commit 00d484f354d85845991b40141d40ba9e5eb60faf upstream. We've encountered a rcu stall in get_mem_cgroup_from_mm(): rcu: INFO: rcu_sched self-detected stall on CPU rcu: 33-....: (21000 ticks this GP) idle=6c6/1/0x4000000000000002 softirq=35441/35441 fqs=5017 (t=21031 jiffies g=324821 q=95837) NMI backtrace for cpu 33 <...> RIP: 0010:get_mem_cgroup_from_mm+0x2f/0x90 <...> __memcg_kmem_charge+0x55/0x140 __alloc_pages_nodemask+0x267/0x320 pipe_write+0x1ad/0x400 new_sync_write+0x127/0x1c0 __kernel_write+0x4f/0xf0 dump_emit+0x91/0xc0 writenote+0xa0/0xc0 elf_core_dump+0x11af/0x1430 do_coredump+0xc65/0xee0 get_signal+0x132/0x7c0 do_signal+0x36/0x640 exit_to_usermode_loop+0x61/0xd0 do_syscall_64+0xd4/0x100 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The problem is caused by an exiting task which is associated with an offline memcg. We're iterating over and over in the do {} while (!css_tryget_online()) loop, but obviously the memcg won't become online and the exiting task won't be migrated to a live memcg. Let's fix it by switching from css_tryget_online() to css_tryget(). As css_tryget_online() cannot guarantee that the memcg won't go offline, the check is usually useless, except some rare cases when for example it determines if something should be presented to a user. A similar problem is described by commit 18fa84a2db0e ("cgroup: Use css_tryget() instead of css_tryget_online() in task_get_css()"). Johannes: : The bug aside, it doesn't matter whether the cgroup is online for the : callers. It used to matter when offlining needed to evacuate all charges : from the memcg, and so needed to prevent new ones from showing up, but we : don't care now. Link: http://lkml.kernel.org/r/20191106225131.3543616-1-guro@fb.com Signed-off-by: Roman Gushchin Acked-by: Johannes Weiner Acked-by: Tejun Heo Reviewed-by: Shakeel Butt Cc: Michal Hocko Cc: Michal Koutn Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- mm/memcontrol.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -741,7 +741,7 @@ static struct mem_cgroup *get_mem_cgroup if (unlikely(!memcg)) memcg = root_mem_cgroup; } - } while (!css_tryget_online(&memcg->css)); + } while (!css_tryget(&memcg->css)); rcu_read_unlock(); return memcg; }