From owner-freebsd-hackers@freebsd.org Mon Mar 6 02:53:04 2017 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 18497CF9F6C for ; Mon, 6 Mar 2017 02:53:04 +0000 (UTC) (envelope-from embaudarm@gmail.com) Received: from mail-oi0-x22e.google.com (mail-oi0-x22e.google.com [IPv6:2607:f8b0:4003:c06::22e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id C961C1924 for ; Mon, 6 Mar 2017 02:53:03 +0000 (UTC) (envelope-from embaudarm@gmail.com) Received: by mail-oi0-x22e.google.com with SMTP id 126so27097256oig.3 for ; Sun, 05 Mar 2017 18:53:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=ulqQn5g72/7+hC4uT09ZTfTxjBAqgWBuSV8OBzQmVNA=; b=QzekDUbOtypSh2wwlgmrjMQHvdQsGbAYFtlF5yzgDtxeKYyVuVrsIwpixEj2/3tD/D vyjlm/lNCCNgf0mInHwOwulJqyFey9OIpUsdOcu7M50pcmpprbka7pDczMzwrSKoFmyH UieVvhP3GjudDuscqNgtHOOMac1XENsf1nUbun+NF5BwObDZ1w+OuKx0MANMDnm0eZRk CzkuzyvihZ9BShRbaJb4RAIzgc/gHk07bueXui3CkkC/4dLSQXOi/Uad8cQXBTuWAZWi dJKg/6F7wO/BWv1FKAdxxscGEXXCzEI6pUvs/KkUwqrLv2mCFYwSotynCjIMFXRDB0sV JBKw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=ulqQn5g72/7+hC4uT09ZTfTxjBAqgWBuSV8OBzQmVNA=; b=opsuOT5Qq07qmNDZ6v19wsjSKNCNdLEnV/IhLIPkjxpcw0eW92X4uK6Sl1hawjsoRq YEqXe5hDHlrxbScfHizZ0GpF3a8BB2AzLs8xyoHIT8mjoBFkRtt7I1gITkUFJgfHwq14 yAHmSP0MjwtRFNl0vxPDkPzVbdqfbdHeKO0qqwwK094yICQUzSdtykZPEFpceTJhJT6n mYoJXGX+FQJ5CIALdeoMcf+aEXzaUZWboYL7z1fcqUNP52cKvyCls0++rsF9H9wMBwlg VjGPKYbQuX+ikv3Pr/hwhF/jNglRlvkNvrISwZBw1vbySrH7B6HGIrH4P3zHtJdgflXV muQA== X-Gm-Message-State: AMke39kDACvqJABnwtgyZ4fXRpbijJ9wQVvScOY8wYaWkog6x5xJNelK8N6Qc3os895pHaaIh8T3idmCiYJowA== X-Received: by 10.202.240.70 with SMTP id o67mr7300064oih.195.1488768783152; Sun, 05 Mar 2017 18:53:03 -0800 (PST) MIME-Version: 1.0 Received: by 10.157.31.46 with HTTP; Sun, 5 Mar 2017 18:52:22 -0800 (PST) In-Reply-To: References: From: Lee D Date: Sun, 5 Mar 2017 21:52:22 -0500 Message-ID: Subject: Re: How approach debugging a kernel crash? To: Alexander Tarasikov Cc: freebsd-hackers@freebsd.org Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.23 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 06 Mar 2017 02:53:04 -0000 Thank you, I will give that a try. I didn't know about the FAR. Lee On Fri, Mar 3, 2017 at 9:57 AM, Alexander Tarasikov < alexander.tarasikov@gmail.com> wrote: > Hi, > the kernel prints the FAR, the fault address register, and the registers. > Looks like it crashes inside the fault handler itself? > > I would go to the "abort_handler" or "exception_exit" and add debugging > prints to UART into there to catch the initial abort. Hope this leads > somewhere > >