Date: Mon, 11 Jul 2016 12:44:24 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-stable@freebsd.org Subject: Re: Not-so stable if you take a CAM error.... Message-ID: <21f3f685-4618-e258-0538-75602608cf9b@denninger.net> In-Reply-To: <1468258789.72182.122.camel@freebsd.org> References: <2b0c454b-c1a0-4b5b-e778-bf0939e90ae1@denninger.net> <op.ykfe1fvbkndu52@ronaldradial.radialsg.local> <6e9c07e1-12a6-a7cd-f775-6b0fe5a706bc@denninger.net> <1468243977.72182.118.camel@freebsd.org> <877f5e8e-c1e7-6fb0-6ceb-031ce3e68582@denninger.net> <CAKFCL4WrRS1ic1CZqcmbCEnsrD2pkh4VHPBFyB%2B-3NaNJZ%2BJkw@mail.gmail.com> <1468254746.72182.121.camel@freebsd.org> <f22ab40d-42f0-78a3-d3a7-945387259109@denninger.net> <1468258789.72182.122.camel@freebsd.org>
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On 7/11/2016 12:39, Ian Lepore wrote:
> On Mon, 2016-07-11 at 12:30 -0500, Karl Denninger wrote:
>> On 7/11/2016 11:32, Ian Lepore wrote:
>>> On Mon, 2016-07-11 at 09:50 -0400, Brandon Allbery wrote:
>>>> On Mon, Jul 11, 2016 at 9:46 AM, Karl Denninger <
>>>> karl@denninger.net>
>>>> wrote:
>>>>
>>>>> Here's the backtrace ... sounds like expected behavior, which
>>>>> is
>>>>> not-so
>>>>> good all-in for a situation like this. I guess the strategy is
>>>>> to
>>>>> turn
>>>>> off softupdates before attempting such an update so as not to
>>>>> crash
>>>>> the
>>>>> host machine if there's a problem with the card.
>>>>>
>>>> I would tend to assume that removable media should not have
>>>> softupdates
>>>> enabled. Even with properly working media, it's practically
>>>> begging
>>>> for
>>>> corruption.
>>>>
>>> Writing to an sdcard without softupdates enabled will be an
>>> exercise in
>>> patience. Like, come back next week and maybe it'll be done.
>>>
>>> The only thing that comes to mind with this is maybe some sort of
>>> mount
>>> flag to say you're willing to live with any amount of filesystem
>>> corruption in lieu of panicking. I'm not sure how easy/practical
>>> that
>>> would be to implement, though.
>>>
>>> -- Ian
>> Why not force-detach the volume that takes the error instead of a
>> panic()?
>>
> Patches welcome.
>
> -- Ian
Any hints on where the routine(s) live that would forcibly detach a
volume? (I'll go digging as well but shortening the time would help :))
--
Karl Denninger
karl@denninger.net <mailto:karl@denninger.net>
/The Market Ticker/
/[S/MIME encrypted email preferred]/
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