Port, board and/or hardware

esp32 port

MicroPython version

➜  esp32 git:(master) git describe --dirty
v1.24.0-224-ga4ab84768

Reproduction

Making single requests to 2 different TLS endpoints (which have small payloads).

➜  esp32 git:(master) ✗ idf.py --version
ESP-IDF v5.4
...
Chip is ESP32-D0WDQ6 (revision v0.0)
Features: WiFi, BT, Dual Core, Coding Scheme None
Crystal is 40MHz

Expected behaviour

IDF 5.3 was stable without change to MICROPY_GC_INITIAL_HEAP_SIZE

➜  esp32 git:(master) idf.py --version
ESP-IDF v5.3

Observed behaviour

I was getting various intermittent lock up (including no ping responses via network to device) or OSError with TLS HTTP requests:
(-17040, 'MBEDTLS_ERR_RSA_PUBLIC_FAILED+MBEDTLS_ERR_MPI_ALLOC_FAILED')
(-29312, 'MBEDTLS_ERR_SSL_CONN_EOF')
[Errno 104] ECONNRESET

Workaround: Adjusting MICROPY_GC_INITIAL_HEAP_SIZE to (52 * 1024) (from 56) none of these errors triggered. Errors triggered if I had the value set to (54 * 1024) as well.

Additional Information

It is unstable on 5.3.2 as well, but I noted it is not in the "approved" IDF versions. I am not sure if the patch version matters, but because 5.2 and 5.2.2 are explicitly listed, it makes me think they are. Unfortunately, IDF does not have a 5.3.0, so I think micropython esp32 port just lists 5.3. May be worth indicating that supported patch versions will be explicitly listed.

it was relatively stable on 5.3.1 (not as bad as 5.3.2)

Code of Conduct

Yes, I agree