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 85C43C4167B for ; Sat, 2 Dec 2023 02:15:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231238AbjLBCOp (ORCPT ); Fri, 1 Dec 2023 21:14:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46766 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231289AbjLBCOl (ORCPT ); Fri, 1 Dec 2023 21:14:41 -0500 Received: from mail-oi1-f197.google.com (mail-oi1-f197.google.com [209.85.167.197]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AF1BDD48 for ; Fri, 1 Dec 2023 18:14:47 -0800 (PST) Received: by mail-oi1-f197.google.com with SMTP id 5614622812f47-3b8b0fb63cbso256603b6e.1 for ; Fri, 01 Dec 2023 18:14:47 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701483287; x=1702088087; 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=hul+Elo9f6B4+TplkMlf+ft8nPG5pNQ1JFIjGrSDHVw=; b=njydJuVE8P/a7QgIwMS4YRl6B6qkLzBTSa4znKcYBdxjOLpaVekZSMDZTXcGXgkStq LfTwh7ywGhx+CB1myGpykO9ji7bw1wSSdBm03ejG0PLi/8RnE5kQIxRfnVzqI1TmJkP9 aHEe9/wKBCtfjsYHGDfo/7CYHV6nEqejvXpyA7mtnnbiftTDkJD9vR6po/QW04BTLFga L1np+l9v2eHSTP5o8guafTllB3R+0YQxlP1ijCsVjBMfx8cmaY1w+LOD0Y6z7lwwZidF 6uZI48OLk2SWa7Tb0trmzMWWQVO/DEaLnstqNJnl8ujCKDfMYoGxgb0ttXunWsmH2oRj 7cdQ== X-Gm-Message-State: AOJu0YwolEc3UsfSreUGq+wcg0QWgvZ0SE53SoZG4a9sJAVsQMuu3MLu i2eS5rNQzRdtmjN4m93L6Y06p5BpLRen7qT6FqkiQ78vMVzpwfw= X-Google-Smtp-Source: AGHT+IEcfiDrGCUuZRICRlKd+13SPobNyMwX7vNTqjpeDaHuaR9ZoMyObWbE0Wkn+0jukL884mm9hmRL5PEbDH9jxBfrOauGeJ0L MIME-Version: 1.0 X-Received: by 2002:a05:6808:bc4:b0:3b8:8f2e:5ef0 with SMTP id o4-20020a0568080bc400b003b88f2e5ef0mr227520oik.8.1701483286973; Fri, 01 Dec 2023 18:14:46 -0800 (PST) Date: Fri, 01 Dec 2023 18:14:46 -0800 In-Reply-To: <00000000000047eb7e060b652d9a@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000e952ff060b7d724d@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..a1b341722693 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_nested(&q->debugfs_mutex, 0); + else + mutex_lock_nested(&q->debugfs_mutex, 1); switch (cmd) { case BLKTRACESETUP: