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.
Regards,
Michael
Am 28.01.19 um 20:43 schrieb Michael
Balzer:
For those not following the github discussion: I'm pretty sure
I've nailed the bug down.
I have reproduced the bug in a simple test project and intend to
raise an issue with Espressif on this.
https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/issues/189#issuecomment-457965435
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.
Regards,
Michael
Am 24.01.19 um 21:19 schrieb
Michael Balzer:
Everyone please have a look at…
https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/issues/189#issuecomment-457334248
Please try to reproduce the bug on your modules.
I'm open for explanations.
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.
My remaining theories:
- A task writing out of bounds (but only 0-bytes?)
- A hardware issue only affecting some modules
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.
Regards,
Michael
--
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Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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