Date: Tue, 19 May 2020 11:11:18 -0500 From: Valeri Galtsev <galtsev@kicp.uchicago.edu> To: Tim Daneliuk <tundra@tundraware.com>, Michael Schuster <michaelsprivate@gmail.com> Cc: freeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: OT: Weird Hardware Problem Message-ID: <0292461d-c23e-4faf-34cf-9fd394c3bab6@kicp.uchicago.edu> In-Reply-To: <06484655-6e1f-7ddd-561e-3ff896f8c646@tundraware.com> References: <0a9f810d-7b4b-f4e6-4b7c-716044a9cf69@tundraware.com> <a3aa3910-5f7e-813f-b6f8-b9ab12b1336d@qeng-ho.org> <20200519103835.00003914@seibercom.net> <e91cfa85-d7cf-637b-01e7-9fd6e870a103@kicp.uchicago.edu> <65f0c2dd-b431-9b9a-d256-1acf4801c771@tundraware.com> <CADqw_gKcZ_VeXhX7vBtdrKo7DYfbpHo4GO8Lm=RjRRxEjYpxPw@mail.gmail.com> <06484655-6e1f-7ddd-561e-3ff896f8c646@tundraware.com>
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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 ++++++++++++++++++++++++++++++++++++++++
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