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=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 B3FECC43461 for ; Wed, 12 May 2021 19:57:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9644E61422 for ; Wed, 12 May 2021 19:57:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1384412AbhELT6M (ORCPT ); Wed, 12 May 2021 15:58:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:55234 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353206AbhELSK4 (ORCPT ); Wed, 12 May 2021 14:10:56 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 82D8B61942; Wed, 12 May 2021 18:05:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1620842744; bh=HoXhbdPkempNh0y+GrVdzvcto/dJ8wWErjeD512HHMg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=a/Qf/00L0tmitPjYxmwQ0f8kpRyGCRTyhZbB3PtCSpFDuLcvDmqG5fEiggW6VBfw4 gi5rviYba5Czv+UIUFG8fIwtvUgNTbd7HHcCyb+jYB002YhCWBT4yjnv3DjcwteveS Ymgj+FX23/FeeNwLhNm/OBLN5QH1FqFuwHheAwLtFtpkuSPFJIv/7raHmKjrSRL1rC i0Za91Z1TEUswlOm7hUXs57k8e2/GCgAAYKNQuuA9eXfVAcACDMEb+qp3tZ33/ktEg mZG69i1YZqNz92JLWKBc8VNZIVOt3PoS4Vl4SuFCrYUwt1zFy+t7kUY2ZeTxCdWV8/ LghT76nrbstyQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zqiang , Andrew Halaney , Alexander Potapenko , "Gustavo A . R . Silva" , Vijayanand Jitta , Vinayak Menon , Yogesh Lal , Andrew Morton , Linus Torvalds , Sasha Levin Subject: [PATCH AUTOSEL 4.14 12/12] lib: stackdepot: turn depot_lock spinlock to raw_spinlock Date: Wed, 12 May 2021 14:05:22 -0400 Message-Id: <20210512180522.665788-12-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210512180522.665788-1-sashal@kernel.org> References: <20210512180522.665788-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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(-) diff --git a/lib/stackdepot.c b/lib/stackdepot.c index 759ff419fe61..c519aa07d2e9 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -78,7 +78,7 @@ static void *stack_slabs[STACK_ALLOC_MAX_SLABS]; 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(struct stack_trace *trace, 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(struct stack_trace *trace, 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. */ -- 2.30.2