[Ovmsdev] OVMS v2 Memory/Settings Corruption

Wed Nov 30 05:13:37 HKT 2016

Thank you Michael,
Will flash it this weekend!

MfG,
JaXX./.

On Tue, Nov 29, 2016 at 10:10 PM, Michael Balzer <dexter at expeedo.de> wrote:

> Julien, Pierre,
>
> here's a firmware build with crash debug enabled:
> https://dexters-web.de/f/tw-beta/OVMS-Twizy-3.8.2-crashdebug.zip
>
> It excludes the diag mode (serial interface command shell) but is
> otherwise complete.
>
> The crash debug logs to the server (when it is/becomes available),
> historical record type "*-OVM-DebugCrash". These records expire after 30
> days, so you can collect some days.
>
> The crash count and data from the most recent crash will also be shown by
> the SMS/text command "DIAG".
>
> The crash records contain a crash count, crash reasons (flags from RCON)
> and the last checkpoint seen before the crash.
>
> Regards,
> Michael
>
>
>
> Am 28.11.2016 um 22:37 schrieb Julien Banchet:
>
> Sure Michael,
>
> I've never got around compiling it right, and I'm out of a Windows since,
> wow, I don't even know if grub would boot the partition anymore... If you
> have it under hand (i hope), I'd be happy to give it a shot, it would also
> be the occasion for me next weekend to pull a ribbon cable out once and for
> all (or find a clever way to keep it hidden though programmable)
>
> How does crash recording work ? over Diag ? (PS: 50M/month data if needed)
>
> Julien
> ./.
>
> On Mon, Nov 28, 2016 at 10:16 PM, Michael Balzer <dexter at expeedo.de>
> wrote:
>
>> There's no memory management in the module, there's too few RAM available
>> to do dynamic allocations.
>>
>> All buffers are static, the error can be some pointer corruption or
>> missing length check / end of string check.
>>
>> A stack overflow could also be possible, the software stack is 256 bytes
>> (1 page). As there's not enough ROM left to support the crash debug
>> framework anymore in the Twizy build, I cannot tell if that happens again.
>>
>> Julien, you could try a reduced build with crash debug recording
>> enabled...
>>
>> Regards,
>> Michael
>>
>>
>>
>> Am 28.11.2016 um 22:00 schrieb Greg D.:
>>
>> Ah!  That sounds much more likely.
>>
>> Is there an error (timeout) path that might be freeing the buffer when
>> it's still in use?
>>
>> Greg.
>>
>>
>> Michael Balzer wrote:
>>
>> Hi Greg, welcome :)
>>
>> Juliens parameter #0 has been overwritten with "Topping o", which is part
>> of the charge status message ("Topping off").
>>
>> So it's much more likely we've got a buffer corruption bug that's
>> triggered by (maybe) bad connectivity situations.
>>
>> Regards,
>> Michael
>>
>>
>> Am 28.11.2016 um 06:38 schrieb Greg D.:
>>
>> Hi all,
>>
>> New here, so this may be totally off the wall.
>>
>> I notice that the first example, with a "5" going to a "k", it may be
>> more easily explained as a bit *shift* instead of a set of flips.  Is
>> there anywhere in the system where the bytes are clocked serially between
>> devices, where there may be some marginal timing?
>>
>> Just a thought.
>>
>> Greg.
>>
>>
>> Mark Webb-Johnson wrote:
>>
>> $ perl -e 'printf "%08b\n",ord("5");'
>> 00110101
>> $ perl -e 'printf "%08b\n",ord("k");'
>> 01101011
>> $ perl -e 'printf "%08b\n",ord("8");'
>> 00111000
>> $ perl -e 'printf "%08b\n",ord("Z");'
>> 01011010
>>
>> Strange. Seems more than a simple bit flip. I haven’t seen this myself, or heard of it much from other users.
>>
>> Is the Twizy code using EEPROM for anything other than settings storage? I know that there are a very limit number of write cycles into that EEPROM space.
>>
>> I did some googling, but all I can find is corruption during writing (either power down, or interrupt during write). But, for our case of very very rare EEPROM writes, that shouldn’t be an issue.
>>
>> Regards, Mark.
>>
>>
>> On 25 Nov 2016, at 5:47 AM, Michael Balzer <dexter at expeedo.de> <dexter at expeedo.de> wrote:
>>
>> The EEPROM data loss is a known issue, and I'm afraid there's nothing we can do about that. It seems to be a bug in the PIC18.
>>
>> Regards
>> Michael
>>
>> Am 24.11.2016 um 22:10 schrieb Julien Banchet:
>>
>> Hi all,
>>
>> Thanks to Michaels last message to remind me to ask a question here:
>>
>> Since a few months, maybe a bit more because it happens only once in a while, I have noticed I wasn't receiving the SMS alerts (feature on SMSIP mode) , and sending a "Stats?" only gave me the nasty access denied answer.
>>
>> It turns out, using the application, I noticed that the phone number was getting corrupted (afaik, it's the only setting affected)
>>
>> Normally: "+33651886877" it became "+336k1886877" or "+33651886Z77" etc... like a solar flare bit flip !_______________________________________________
>>
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