ssl_tls.c:5875 alloc(16717 bytes) failed (IDFGH-4286)

[zhaochengwei]

As you can see, 16384 is TLS maximum message content length.But I met this problem, So what's the problem?

esp-idf v3.1

[negativekelvin]

You probably ran out of free heap. You need 40k to do ssl with full length buffers.

[zhaochengwei]

You probably ran out of free heap. You need 40k to do ssl with full length buffers.

So, how can I enlarge my full length buffers?

[negativekelvin]

No, it means there is not enough memory available. You can try some of the menuconfig option for asymmetric buffers or reduce your app memory usage or use wrover/psram.

[zhaochengwei]

No, it means there is not enough memory available. You can try some of the menuconfig option for asymmetric buffers or reduce your app memory usage or use wrover/psram.

OK，I solved the problem thank you !

[Jigar3690]

@zhaochengwei How did you resolved it? I am facing the same issue with exact same number of bytes!
mbedtls: ssl_tls.c:6893 alloc(16717 bytes) failed I did enough memory leak analysis already. Tried increasing the stack size as well. But no change.

[VitoLeo92]

No, it means there is not enough memory available. You can try some of the menuconfig option for asymmetric buffers or reduce your app memory usage or use wrover/psram.

OK，I solved the problem thank you !

@zhaochengwei How did you resolved it?

[HamzaHajeir]

I'm having the exact same issue,
the number is a preprocessor-defined.
My heap is very large at the moment of the call H=143412 and the maximum heap block is also very large M=110580 :

             > altcp_tls: TCP_WND is smaller than the RX decrypion buffer, connection RX might stall!
04:10:41.028 > H4AT:1: H=143412 M=110580 S=4684
04:10:41.029 > IDF/components/mbedtls/mbedtls/library/ssl_tls.c:3857: alloc(16717 bytes) failed
04:10:41.030 > mbedtls_ssl_setup failed
04:10:41.031 > tcp_close: closing in State: CLOSED

[hitecSmartHome]

Facing the same issue. I also have enough max contigous heap block but calloc fails with mbedtls