PSA Crypto (key derivation) fault on NRF54L15 when called from BLE callbacks

RE: PSA Crypto (key derivation) fault on NRF54L15 when called from BLE callbacks

Hung Bui — Mon, 22 Sep 2025 12:53:19 GMT

Thanks for the update. Then it's not the issue with context priority but about the memory buffer.

RE: PSA Crypto (key derivation) fault on NRF54L15 when called from BLE callbacks

Alex P — Mon, 22 Sep 2025 12:31:28 GMT

Hi Hung,

If it helps, I have managed to resolve the issue by increasing Bluetooth RX thread stack size to 4096 bytes.

RE: PSA Crypto (key derivation) fault on NRF54L15 when called from BLE callbacks

Hung Bui — Mon, 22 Sep 2025 09:23:39 GMT

Hi Alex,

You are right that the PSA API is supposed to run in thread context, not in event handler context. But it's quite strange that even with a worker call you still see the problem.
Could you try to do a test to first start the work in main() then try to start the same work in the BLE event handler.

Please send us the log when you see the assert.
And please send us the sample that does the test above so we can test here.