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<div class="moz-cite-prefix">Mark,<br>
<br>
issue #2892 mentions using only the lower 2 MB of SPI RAM as a
workaround. Where are our allocations placed by the allocator?
Does it fill from the middle or end? If not we don't use the upper
half yet.<br>
<br>
A possible workaround for the most apparent issues with this
(string assembly) could be to use char buffers instead of
std::string. I was thinking about doing that at least for the
websocket stream.<br>
<br>
But if this really is a hardware issue it can affect all objects
in SPI RAM, appending to std::string then only triggers this more
often.<br>
<br>
Another workaround could be to run everything on core 0.<br>
<br>
Regards,<br>
Michael<br>
<br>
<br>
Am 30.01.19 um 03:33 schrieb Mark Webb-Johnson:<br>
</div>
<blockquote type="cite"
cite="mid:4737F304-A344-4BD8-9B0C-95366DB7A40F@webb-johnson.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
Michael,
<div class=""><br class="">
</div>
<div class="">Espressif’s response (and linking to that other
issue) sounds like others are seeing this.</div>
<div class=""><br class="">
</div>
<div class="">Lousy timing (with Chinese New Year next week), so
don’t expect anything quick from Espressif. I guess we’ll just
have to live with it until they can find a workaround. It sounds
like the issue is at the hardware level and a compiler patch
will be needed.</div>
<div class=""><br class="">
</div>
<div class="">Regards, Mark.<br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On 30 Jan 2019, at 3:07 AM, Michael Balzer
<<a href="mailto:dexter@expeedo.de" class=""
moz-do-not-send="true">dexter@expeedo.de</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class="">
<div text="#000000" bgcolor="#FFFFFF" class=""> → <a
class="moz-txt-link-freetext"
href="https://github.com/espressif/esp-idf/issues/3006"
moz-do-not-send="true">https://github.com/espressif/esp-idf/issues/3006</a><br
class="">
<br class="">
Regards,<br class="">
Michael<br class="">
<br class="">
<br class="">
<div class="moz-cite-prefix">Am 28.01.19 um 20:46
schrieb Michael Balzer:<br class="">
</div>
<blockquote type="cite"
cite="mid:b193b172-9a83-6df5-7b61-9e0cbfa46281@expeedo.de"
class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class="">
To clarify: the bug is most likely not restricted to
the case of building a message in a buffer. It can
possibly cause corruptions in any RAM section, so can
well be responsible for many/most of the unidentified
crashes and stack/heap corruptions we're experiencing.<br
class="">
<br class="">
Regards,<br class="">
Michael<br class="">
<br class="">
<br class="">
<div class="moz-cite-prefix">Am 28.01.19 um 20:43
schrieb Michael Balzer:<br class="">
</div>
<blockquote type="cite"
cite="mid:06d0ea65-f4d5-e2c5-9ca1-b0ad63bfa3b1@expeedo.de"
class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class="">
For those not following the github discussion: I'm
pretty sure I've nailed the bug down.<br class="">
<br class="">
I have reproduced the bug in a simple test project
and intend to raise an issue with Espressif on this.<br
class="">
<br class="">
<a class="moz-txt-link-freetext"
href="https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/issues/189#issuecomment-457965435"
moz-do-not-send="true">https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/issues/189#issuecomment-457965435</a><br
class="">
<br class="">
If you'd like to test this on your module, configure
the project to your wifi credentials, then use "make
flash". As the test project is small, this normally
will not erase your OVMS config partition, but a
backup is always recommended.<br class="">
<br class="">
Regards,<br class="">
Michael<br class="">
<br class="">
<br class="">
<div class="moz-cite-prefix">Am 24.01.19 um 21:19
schrieb Michael Balzer:<br class="">
</div>
<blockquote type="cite"
cite="mid:e4159a1c-b283-25b0-f1b5-ce570b529a1c@expeedo.de"
class="">
<meta http-equiv="content-type"
content="text/html; charset=UTF-8" class="">
Everyone please have a look at…<br class="">
<br class="">
<a class="moz-txt-link-freetext"
href="https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/issues/189#issuecomment-457334248"
moz-do-not-send="true">https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/issues/189#issuecomment-457334248</a><br
class="">
<br class="">
Please try to reproduce the bug on your modules.<br
class="">
<br class="">
I'm open for explanations.<br class="">
<br class="">
I thought this might be some copy-on-write bug
with std::string, but the gcc 5.x libstdc++ does
no longer use that implementation (wouldn't be
C++11 compliant as well). I also tried moving all
strings to temporary buffers, but modes 5 & 6
eliminated this explanation as well.<br class="">
<br class="">
My remaining theories:<br class="">
<ul class="">
<li class="">A task writing out of bounds (but
only 0-bytes?)</li>
<li class="">A hardware issue only affecting
some modules<br class="">
</li>
</ul>
A hardware issue only affecting some percentage of
ESP32 could explain this as well as the strange
heap corruptions that seem to affect some modules
especially often.<br class="">
<br class="">
Regards,<br class="">
Michael<br class="">
<br class="">
<pre class="moz-signature" cols="160">--
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
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