From patchwork Thu May 20 09:23:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 445342 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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_NONE, URIBL_RED, USER_AGENT_GIT autolearn=ham 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 92F72C43462 for ; Thu, 20 May 2021 11:06:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 722B16135A for ; Thu, 20 May 2021 11:06:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239535AbhETLIN (ORCPT ); Thu, 20 May 2021 07:08:13 -0400 Received: from mail.kernel.org ([198.145.29.99]:39782 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239140AbhETLGE (ORCPT ); Thu, 20 May 2021 07:06:04 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DE33E60FDB; Thu, 20 May 2021 10:05:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621505130; bh=bxQYnJV0rEBNwhtbGDeP8nQut7nB2UF5lBADMfe58Sk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mJP+wGChkL5N8+j96JTVna8DbBPfDr1NZ2qrgrBZV0SOK3Yu/qwvz4btQLIo8Fn4r 0GNOSn2s4fvOCYHelpQ4VlpaALCI2QAfB74C3RfKvCvxuF7xujRQ6gmGCYryUjjywX ERA0NDkNm3uolFxUl08lv+t0W8khM4tcNbdSHFDw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Zqiang , Andrew Halaney , Alexander Potapenko , "Gustavo A. R. Silva" , Vijayanand Jitta , Vinayak Menon , Yogesh Lal , Andrew Morton , Linus Torvalds , Sasha Levin Subject: [PATCH 4.9 236/240] lib: stackdepot: turn depot_lock spinlock to raw_spinlock Date: Thu, 20 May 2021 11:23:48 +0200 Message-Id: <20210520092116.613782743@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092108.587553970@linuxfoundation.org> References: <20210520092108.587553970@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Zqiang [ Upstream commit 78564b9434878d686c5f88c4488b20cccbcc42bc ] In RT system, the spin_lock will be replaced by sleepable rt_mutex lock, in __call_rcu(), disable interrupts before calling kasan_record_aux_stack(), will trigger this calltrace: BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:951 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 19, name: pgdatinit0 Call Trace: ___might_sleep.cold+0x1b2/0x1f1 rt_spin_lock+0x3b/0xb0 stack_depot_save+0x1b9/0x440 kasan_save_stack+0x32/0x40 kasan_record_aux_stack+0xa5/0xb0 __call_rcu+0x117/0x880 __exit_signal+0xafb/0x1180 release_task+0x1d6/0x480 exit_notify+0x303/0x750 do_exit+0x678/0xcf0 kthread+0x364/0x4f0 ret_from_fork+0x22/0x30 Replace spinlock with raw_spinlock. Link: https://lkml.kernel.org/r/20210329084009.27013-1-qiang.zhang@windriver.com Signed-off-by: Zqiang Reported-by: Andrew Halaney Cc: Alexander Potapenko Cc: Gustavo A. R. Silva Cc: Vijayanand Jitta Cc: Vinayak Menon Cc: Yogesh Lal Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- lib/stackdepot.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -78,7 +78,7 @@ static void *stack_slabs[STACK_ALLOC_MAX static int depot_index; static int next_slab_inited; static size_t depot_offset; -static DEFINE_SPINLOCK(depot_lock); +static DEFINE_RAW_SPINLOCK(depot_lock); static bool init_stack_slab(void **prealloc) { @@ -253,7 +253,7 @@ depot_stack_handle_t depot_save_stack(st prealloc = page_address(page); } - spin_lock_irqsave(&depot_lock, flags); + raw_spin_lock_irqsave(&depot_lock, flags); found = find_stack(*bucket, trace->entries, trace->nr_entries, hash); if (!found) { @@ -277,7 +277,7 @@ depot_stack_handle_t depot_save_stack(st WARN_ON(!init_stack_slab(&prealloc)); } - spin_unlock_irqrestore(&depot_lock, flags); + raw_spin_unlock_irqrestore(&depot_lock, flags); exit: if (prealloc) { /* Nobody used this memory, ok to free it. */