Date: Tue, 19 May 2020 14:59:48 +0100 From: Arthur Chance <freebsd@qeng-ho.org> To: Tim Daneliuk <tundra@tundraware.com>, FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: OT: Weird Hardware Problem Message-ID: <a3aa3910-5f7e-813f-b6f8-b9ab12b1336d@qeng-ho.org> In-Reply-To: <0a9f810d-7b4b-f4e6-4b7c-716044a9cf69@tundraware.com> References: <0a9f810d-7b4b-f4e6-4b7c-716044a9cf69@tundraware.com>
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On 19/05/2020 14:46, Tim Daneliuk wrote: > I was recently given a Dell Inspiron 3847 which has an i7-4790 and 16G > of memory. Perfect for multibooting BSD and Linux. It needed a new power > supply but now that this is installed, it's exhibiting a very strange > problem. > > The machine will work for hours flawless and then - for no apparent reason - > reboot randomly. The former owner reports that this was also happening > when they last had it running Win8. > > I've run very heavy loads on it with load averages up to almost 50 - no > problem. I've run overnight memory tests which return 0 errors. > I've run CPU stress tests flawlessly and temperatures were fine. > > One hint here: I can consistently force the problem to happen if I start > a Linux installation and request full disk encryption as part of the install. > I doubt it has anything to with encryption per se, but there is some kind > of pattern of use that it causing the reboot. > > Has anyone else ever seen something like this and/or have resolution? > > Is there a known bug with that processor? I've got an i7-4790K (I presume you missed the K) in my desktop and Intel announced the CPU had problems with the TSX instruction set extension shortly after I got it, and that those instructions should be disabled in the BIOS. Other than that I've seen no suggestion anything else is buggy. > My first instinct was to blame flakey memory (DDR 1600 2x8G Hynix) but - > as I said - memory testing is flawless. > > Thoughts and ideas most welcome. If you hadn't changed the power supply I'd have suggested you look at that, but otherwise not a clue. -- Fat Earther: One who believes the world is round but has put on too much weight round the middle.
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