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[2620:137:e000::3:4]) by mx.google.com with ESMTPS id q4-20020a056a00084400b006cbf1bb0b34si4255184pfk.323.2023.12.01.18.54.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 18:54:47 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:4 as permitted sender) client-ip=2620:137:e000::3:4; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:4 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by howler.vger.email (Postfix) with ESMTP id BDC8684AA9F9; Fri, 1 Dec 2023 18:54:44 -0800 (PST) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.11 at howler.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229537AbjLBCy0 (ORCPT + 99 others); Fri, 1 Dec 2023 21:54:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56672 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229456AbjLBCy0 (ORCPT ); Fri, 1 Dec 2023 21:54:26 -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 B213FD4A for ; Fri, 1 Dec 2023 18:54:32 -0800 (PST) Received: by mail-oi1-f197.google.com with SMTP id 5614622812f47-3b88c1f5ecaso1342799b6e.3 for ; Fri, 01 Dec 2023 18:54:32 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701485672; x=1702090472; 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=0HQfyyLQgiVMocyXxgPBbUQnxc/KUPh6dUwMZ5FwIiA=; b=Cf+jbq0aG1ATEQ1f5QcHSIV081wDgpwVFuJm91a8K5SziDLP44V84LuICwcvfXElgG 0m/cfLJ/P4bs4PmB5lTFzAh4ELbY4hFAx6B0hwGL45eYJCQu6Ijkf7nap73g46/joNWX 94G6m/z4sLrVja+0PIBiI2YFVNIGVSE5PnT2hjtL+ixjMzcsijIlUjyPHXkAmFB18czL +eqXeeLxKjLoG5auiWZZ4Mnf1+00kc0RLioebYHPTgaXntzCqtD81ZJjgfBchm1fPkhh THBRWxXWrNuEDZ5fyCIO/WjqP8X0OaJRA4WYqMcIqdc4FKdna0g4hzG69h89eeEojf8h K9gQ== X-Gm-Message-State: AOJu0Yx5PEiR6ZeRLO83citpX2x3IJYj3n9oanXP73gP4i77kwVhEtg3 sy/jhHfMg6f8J2IB9c+QP/cB+cfwt4jU7/byiCPdhzIN7XcGPAU= MIME-Version: 1.0 X-Received: by 2002:a05:6808:178e:b0:3b8:94f5:9158 with SMTP id bg14-20020a056808178e00b003b894f59158mr230510oib.10.1701485672199; Fri, 01 Dec 2023 18:54:32 -0800 (PST) Date: Fri, 01 Dec 2023 18:54:32 -0800 In-Reply-To: <00000000000047eb7e060b652d9a@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000014fd00060b7e01f7@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" X-Spam-Status: No, score=1.1 required=5.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_SORBS_WEB, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on howler.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (howler.vger.email [0.0.0.0]); Fri, 01 Dec 2023 18:54:44 -0800 (PST) X-Spam-Level: * 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..34e5bce42b1e 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -735,7 +735,8 @@ 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 (!mutex_trylock(&q->debugfs_mutex)) + return -EBUSY; switch (cmd) { case BLKTRACESETUP: