From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 69776 invoked by alias); 3 Aug 2016 13:13:22 -0000 Mailing-List: contact systemtap-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: systemtap-owner@sourceware.org Received: (qmail 69758 invoked by uid 89); 3 Aug 2016 13:13:20 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.2 spammy=HTo:U*wcohen, H*Ad:U*fche X-HELO: mail-qt0-f171.google.com Received: from mail-qt0-f171.google.com (HELO mail-qt0-f171.google.com) (209.85.216.171) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES128-GCM-SHA256 encrypted) ESMTPS; Wed, 03 Aug 2016 13:13:09 +0000 Received: by mail-qt0-f171.google.com with SMTP id 52so142398353qtq.3 for ; Wed, 03 Aug 2016 06:13:09 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=5/Fc2QzCDqxkVZXhMSSVpcXxEFAIg4Fv4NV/7MOFpKA=; b=LD1YmfEwdr+kY7QNOeHLqnwDmxv1S+tartuRiyOHNwTUYxIWwrFWCN1ZGJLw8vvNKx DyVsqVWfDgsY1mL9k3BBPaLkPFzBCH5eYdxr2AoI0XHMdJqdGJhX3gCAL2Bvyeqld4jA RfczGZ8F1KYq7Olh4BOQRouvd+t7bvekIhTp1qUvU4Dw0c5cKHR1q6wuFvIAP6dSvzM1 cN5wPxjQ0Oo+QvvOi2Mwp4EBc2CHNfjLMGljv4C4V66Jh5i96So9+159UQ643Pa9T02q KpLjSTroGNMzpQtCW+k9UdMU5Gc3McWZVMoIk9qTgOszhRCD6+5aCD8SE+MuI/ssXRrS xG0A== X-Gm-Message-State: AEkooutD2+KZpJiFBLZ3n/MtmuXLlxmVYApRY2tsClPcIuMMPeEx78XfmdBrHv7sSPGip+mN X-Received: by 10.200.39.246 with SMTP id x51mr107197086qtx.42.1470229987812; Wed, 03 Aug 2016 06:13:07 -0700 (PDT) Received: from localhost ([122.180.189.31]) by smtp.gmail.com with ESMTPSA id a82sm4134470qkj.0.2016.08.03.06.13.05 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 03 Aug 2016 06:13:06 -0700 (PDT) Date: Wed, 03 Aug 2016 13:13:00 -0000 From: Pratyush Anand To: William Cohen Cc: David Long , systemtap@sourceware.org, Mark Brown , Jeremy Linton , David Smith , "Frank Ch. Eigler" Subject: Re: exercising current aarch64 kprobe support with systemtap Message-ID: <20160803131302.GC18785@localhost.localdomain> References: <8f40d0b9-5550-92f9-d1c5-8769f52304c0@redhat.com> <576B5501.1030106@linaro.org> <576C29E1.8060805@linaro.org> <0a594132-796b-779d-b473-a06c0f3e8ae8@redhat.com> <20160627141840.GB8139@dhcppc9> <577EA7EE.2070607@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.6.1 (2016-04-27) X-IsSubscribed: yes X-SW-Source: 2016-q3/txt/msg00112.txt.bz2 On 07/07/2016:03:58:37 PM, Frank Ch. Eigler wrote: > David Long writes: > > > [...] > >> - bug_handler() calls report_bug() which calls __warn() > >> - __warn() does lot of pr_warn() which invokes print_worker_info() > >> where we have a kprobe instrumented. > >> - Therefore, we are encountering this issue. Hi Will, Can you please cross-check if following branch works perfectly with kprobes_onthefly.exp and other systemtap tests. https://github.com/pratyushanand/linux/tree/uprobe/upstream_arm64_devel_v1.1 Following patch in above branch should solve this issue. https://github.com/pratyushanand/linux/commit/d0dcc6477f1279ab0bd99aefc30efdecb16c586e However, I am not yet sure that above modification could be the best solution, so discussing at arm kernel list. ~Pratyush