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 0908BC07E97 for ; Sat, 2 Dec 2023 02:44:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231305AbjLBCo2 (ORCPT ); Fri, 1 Dec 2023 21:44:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40204 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229456AbjLBCo0 (ORCPT ); Fri, 1 Dec 2023 21:44:26 -0500 Received: from mail-ot1-f69.google.com (mail-ot1-f69.google.com [209.85.210.69]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9C2DAE6 for ; Fri, 1 Dec 2023 18:44:32 -0800 (PST) Received: by mail-ot1-f69.google.com with SMTP id 46e09a7af769-6d8755daf0fso265858a34.3 for ; Fri, 01 Dec 2023 18:44:32 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701485072; x=1702089872; 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=I8VsQd2odPhELMIVrd9xtcS8mJ60nf1olqzHfv0Kv38=; b=rrUS4oz0MrDs7U5BC5QKHSrjztR/pCM7JQnfhD1vmdvu6ZvY3NywtkoNACymwAK4Ov zM5qjZT2gke3oNcIWPem24qCUEvOl4+Gw6l3MPZxWnARBUm/fQC/Fswiuw4NGYlj41D6 M7f+Pi5fiQ4ZNiroZPR/VIrMiPGissb6cH+DQUEcCTz9GbH3Jid/Fbz9u4yk9r92CaMd 5gaPItkK7JZK52THnCh3LpB9aTQQS2ibPevqh98xuvw70Or3YJ6CLwy05T6bhPLbqD+M bSp6llIAgKyKOTipvUpWxj5aT2IYu2lBbEl6YX6AN0Kwi0ykQHHuxmEScaXFzq8ej0AY 9tyw== X-Gm-Message-State: AOJu0Yz9DOw9IWHdWs00jCNJIHMR6Tu8nkmQpRYciETeSaexAsWVMpnj dHOMmDDCFfbSJUbECyKUJNKLRWDTgzn9UzTcqfa4DUtOM4IM5sU= X-Google-Smtp-Source: AGHT+IHHF+3dX5oUR8dmH1WO539o1uCdmlSNSwscgHONbdcBMO8ZD6cPCf7sLj8sOFEZl5qI5aIa7lV6JD1eMxFjmmfgvFLGjMtB MIME-Version: 1.0 X-Received: by 2002:a05:6808:1a0c:b0:3ad:f525:52bf with SMTP id bk12-20020a0568081a0c00b003adf52552bfmr248132oib.1.1701485072031; Fri, 01 Dec 2023 18:44:32 -0800 (PST) Date: Fri, 01 Dec 2023 18:44:31 -0800 In-Reply-To: <00000000000047eb7e060b652d9a@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000004f26a8060b7ddda2@google.com> Subject: Re: [syzbot] [block?] [trace?] INFO: task hung in blk_trace_ioctl From: syzbot To: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org. *** Subject: [block?] [trace?] INFO: task hung in blk_trace_ioctl Author: eadavis@qq.com please test task hung in blk_trace_ioctl #syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 8c9660f65153 diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 54ade89a1ad2..f5d3576ef3ed 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -735,7 +735,10 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) int ret, start = 0; char b[BDEVNAME_SIZE]; - mutex_lock(&q->debugfs_mutex); + if (cmd == BLKTRACESETUP) + mutex_lock(&q->debugfs_mutex); + else + mutex_lock_nested(&q->debugfs_mutex, 2); switch (cmd) { case BLKTRACESETUP: