RE: Modem crash with 0x4 while using DECT nr+ MAC/DLC APIs

0x41 — Thu, 18 Jun 2026 14:49:09 GMT

Hi,

Thanks for your answer, but maybe is not the point of what I'm looking for, CONFIG_NRF_MODEM_LIB_SHMEM_CTRL_SIZE is not directly user assignable.

From .config in build directory it sets to 1832, value found inside <sdk home>/nrfxlib/nrf_modem/Kconfig.

In my project I don't re-define NRF_MODEM_DECT_SHMEM_CTRL_SIZE.

Regards,
Alessandro.

RE: Modem crash with 0x4 while using DECT nr+ MAC/DLC APIs

Syed Maysum Abbas Zaidi — Thu, 18 Jun 2026 14:05:51 GMT

Hi,

Yes , the error 0x4 is a modem-internal memory management fault, the modem runs out of internal memory during PDU reassembly on the FT side. One thing I would like to mention that the define NRF_MODEM_DECT_PHY_SHMEM_CTRL_SIZE was renamed to NRF_MODEM_DECT_SHMEM_CTRL_SIZE in 3.3.0. If your project still uses the old name, the control region size may get silently ignored so can you please look through all project files and if you find any old name then rename it to NRF_MODEM_DECT_SHMEM_CTRL_SIZE.

Moreover also ensure CONFIG_NRF_MODEM_LIB_SHMEM_CTRL_SIZE is set to at least 1832.

Best Regards,
Syed Maysum