From owner-freebsd-questions@freebsd.org Tue May 19 16:11:21 2020 Return-Path: Delivered-To: freebsd-questions@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 5F8A92DD4D6 for ; Tue, 19 May 2020 16:11:21 +0000 (UTC) (envelope-from galtsev@kicp.uchicago.edu) Received: from kicp.uchicago.edu (kicp.uchicago.edu [128.135.20.70]) by mx1.freebsd.org (Postfix) with ESMTP id 49RLV04MZ9z3Wfk for ; Tue, 19 May 2020 16:11:20 +0000 (UTC) (envelope-from galtsev@kicp.uchicago.edu) Received: from [192.168.43.113] (unknown [172.58.139.15]) (Authenticated sender: galtsev) by kicp.uchicago.edu (Postfix) with ESMTPSA id 05F234E649; Tue, 19 May 2020 11:11:19 -0500 (CDT) Subject: Re: OT: Weird Hardware Problem To: Tim Daneliuk , Michael Schuster Cc: freeBSD Mailing List References: <0a9f810d-7b4b-f4e6-4b7c-716044a9cf69@tundraware.com> <20200519103835.00003914@seibercom.net> <65f0c2dd-b431-9b9a-d256-1acf4801c771@tundraware.com> <06484655-6e1f-7ddd-561e-3ff896f8c646@tundraware.com> From: Valeri Galtsev Message-ID: <0292461d-c23e-4faf-34cf-9fd394c3bab6@kicp.uchicago.edu> Date: Tue, 19 May 2020 11:11:18 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <06484655-6e1f-7ddd-561e-3ff896f8c646@tundraware.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 49RLV04MZ9z3Wfk X-Spamd-Bar: ++++++ Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=uchicago.edu (policy=none); spf=none (mx1.freebsd.org: domain of galtsev@kicp.uchicago.edu has no SPF policy when checking 128.135.20.70) smtp.mailfrom=galtsev@kicp.uchicago.edu X-Spamd-Result: default: False [6.10 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; RECEIVED_SPAMHAUS_XBL(5.00)[172.58.139.15:received]; GREYLIST(0.00)[pass,meta]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; NEURAL_SPAM_SHORT(0.61)[0.614]; MIME_GOOD(-0.10)[text/plain]; DMARC_POLICY_SOFTFAIL(0.10)[uchicago.edu : No valid SPF, No valid DKIM,none]; NEURAL_SPAM_MEDIUM(0.38)[0.383]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_ALL(0.00)[]; R_SPF_NA(0.00)[no SPF record]; FREEMAIL_TO(0.00)[tundraware.com,gmail.com]; RCVD_NO_TLS_LAST(0.10)[]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:160, ipnet:128.135.0.0/16, country:US]; RCVD_COUNT_TWO(0.00)[2]; MID_RHS_MATCH_FROM(0.00)[]; RECEIVED_SPAMHAUS_PBL(0.00)[172.58.139.15:received] X-Spam: Yes X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 May 2020 16:11:21 -0000 On 5/19/20 11:01 AM, Tim Daneliuk wrote: > On 5/19/20 10:14 AM, Michael Schuster wrote: >> Any chance of capturing a serial console? > > Difficult. I'm not sure it would tell me much, though. When this happens, > the machine just does an instantaneous hard reset as if I had hit a button > to do so. > What if you replace power supply with new one speced twice as powerful as the original one? (borrow from someone for a day or two if you don't have one on the shelf) These things may happen when the power supply is marginally enough powerful for the machine. Also with age electrolytic capacitors are loosing capacitance, which leads to the same (both capacitors on AC adapter or on system board may be the culprit for slightly different reasons. I would inspect system board very carefully, especially around CPU, for any of capacitors bulging, or any traces of capacitors leaked. Those are filtering ripple on PCI[-x/e,...] bus, and ripple there hitting slightly above some threshold will make the machine just reboot. Please, keep us posted. Valeri > -- ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++