FW: Firmware crashes when stopping 24 kHz microphone recording

[Ruben-Lohberg]

While music is streaming over LE Audio, enable and disable microphone recording at 24 kHz. After one or more cycles, the firmware may crash with a memory-slab corruption assertion and enter an infinite error loop:

ASSERTION FAIL ... mem_slab.c
slab corruption detected

[Ruben-Lohberg]

This issue might be resolved through #226

The detailed reproduction attempts are documented in the parent issue #225, especially Test 5.

The captured crash occurred shortly after starting 24 kHz microphone recording while LE Audio was active:

Starting Microphone at 24000 Hz → factor-2 decimator initialized → slab corruption detected.

The current likely cause is that decimated_audio is sized for factor-4 decimation, while factor 2 produces twice as much output. This writes beyond the static buffer and can corrupt Zephyr memory-slab metadata. Because the corruption is nondeterministic, some 24 kHz sessions continue normally while others crash.