Date: Wed, 2 Feb 2022 17:46:26 +1100 From: MJ <mafsys1234@gmail.com> To: "freebsd-arm@freebsd.org" <freebsd-arm@FreeBSD.org> Subject: Re: Error detection for microSD-based swap, buildworld failures on pi3 Message-ID: <4f915aa6-4382-217e-d0b8-28346e5bb8f5@gmail.com> In-Reply-To: <DD5BA69F-E9BB-477E-8700-E2917C981129@yahoo.com> References: <20220129022255.GA59340@www.zefox.net> <6B822440-6F01-4578-803C-20A51DADF10C@yahoo.com> <20220130020546.GA63792@www.zefox.net> <1964F2B7-EC41-42C8-9C18-5E2B79EE0271@yahoo.com> <F4CAC6F9-B9E8-4BD3-BFA0-1706BE56A2AD@yahoo.com> <5B3DF910-23B1-4246-999E-0196E90269F2@yahoo.com> <20220131165333.GA69543@www.zefox.net> <9E0510D2-9FAC-4F01-89A3-E6D8C7C21FDA@yahoo.com> <20220131221405.GA70251@www.zefox.net> <14716537-6E22-44F5-B6AA-841E3EB2AD04@yahoo.com> <20220201161808.GA73977@www.zefox.net> <0e61e2d8-c65f-eb23-473f-69403e33da9e@gmail.com> <E849CF0D-F894-44DF-AA45-B29761242AD9@yahoo.com> <9b604f9e-45bf-b197-562f-1f6381ee5515@gmail.com> <DD5BA69F-E9BB-477E-8700-E2917C981129@yahoo.com>
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On 2/02/2022 3:10 pm, Mark Millard wrote: > On 2022-Feb-1, at 18:52, MJ <mafsys1234@gmail.com> wrote: > >> On 2/02/2022 12:25 pm, Mark Millard wrote: >>> On 2022-Feb-1, at 16:47, MJ <mafsys1234@gmail.com> wrote: >>>> On 2/02/2022 3:18 am, bob prohaska wrote: >>>>> [new subject, different emphasis, old problem] >>>>> On Mon, Jan 31, 2022 at 03:06:01PM -0800, Mark Millard wrote: >>>>>> >>>>>> One thing that could fit the behavior is if small part(s) >>>>>> of the system c++ compiler (or libraires it uses) were >>>>>> corrupted on that specific media. In that case, nothing >>>>>> elsewhere would replicate the failures but a lot might >>>>>> work without using the corrupted part(s), making the >>>>>> failures not random. >>>>> [spaced for emphasis] >>>>>> Checking on that is part of why >>>>>> I'd hoped to get a lldb report for a .sh/.cpp pair >>>>>> leading to failure on your RPi3* in question. >>>>>> >>>>> If/when the stable/13 Pi3 finishes its -j1 single-user >>>>> build/install cycle I'll make a point of trying the >>>>> .sh/.cpp test under lldb. >>>>> For most of their operational history both troublesome Pi3 >>>>> systems have had some of their swap on microSD. If there >>>>> is no error detection at all for microSD-based storage >>>> >>>> Is this true? I would have thought it used some form of error detection in the firmware or in >>>> the controller. >>> The type of error and stage at which the error occurs matters. >>> The firmware can not cover all issues that lead to corrupted >>> content on media. >> >> I did not state it covers all corruption. However, I would be totally surprised if the controller in >> ALL SD cards does not do error checking, whether ECC or even BCH. That remains my point. > > I've a lot more context on Bob's problem and was mostly > giving more context than he supplied. (My name is on the > most nested text that he sent. I've been working with him > for a while on this.) > <snip> Ok, understood, I will refrain. No more noise from me. MJ
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