RE: Intermittent Watchdog Reset on nRF52832 (NCS v3.1.0) in Dual-Role BLE Device – Suspected BLE Subsystem Deadlock (NCSDK-31528 / NCSDK-30959)

Einar Thorsrud — Wed, 18 Mar 2026 13:17:50 GMT

Hi,

1. It is possible to log to noinit RAM and read that RAM after reset. RAM is never explicitly erased, so most likely the RAM content will be valid after the watchdog reset. However, you should add a checksum to verify that the data is intact. You can for instance do this in the watchdog interrupt handler, which gives you a bit of time to copy data to RAM (but not enough time to write to flash).

2. I would not say it is known to have stability issues. However, there are some corner cases which can lead do deadlocks, as you have referred to. One potential solution worth testing is to enable CONFIG_BT_HCI_ACL_FLOW_CONTROL=y. You will likely get build warnings with this and need to also adjust up some buffer sizes (as specified by the warnings). It is also a good idea to try increasing CONFIG_BT_BUF_EVT_RX_COUNT.