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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>
<br>
Regards,<br>
Michael<br>
<br>
<br>
<div class="moz-cite-prefix">Am 28.01.19 um 20:43 schrieb Michael
Balzer:<br>
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cite="mid:06d0ea65-f4d5-e2c5-9ca1-b0ad63bfa3b1@expeedo.de">
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For those not following the github discussion: I'm pretty sure
I've nailed the bug down.<br>
<br>
I have reproduced the bug in a simple test project and intend to
raise an issue with Espressif on this.<br>
<br>
<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>
<br>
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>
<br>
Regards,<br>
Michael<br>
<br>
<br>
<div class="moz-cite-prefix">Am 24.01.19 um 21:19 schrieb Michael
Balzer:<br>
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Everyone please have a look at…<br>
<br>
<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>
<br>
Please try to reproduce the bug on your modules.<br>
<br>
I'm open for explanations.<br>
<br>
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>
<br>
My remaining theories:<br>
<ul>
<li>A task writing out of bounds (but only 0-bytes?)</li>
<li>A hardware issue only affecting some modules<br>
</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>
<br>
Regards,<br>
Michael<br>
<br>
<pre class="moz-signature" cols="160">--
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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