wait_for_queue() hangs on re-init of DFU service

Question

I have an app that requires BLE stack to be re-initialized, however it seems that if you run 
 ble_dfu_init();
 
 more than once, it crashes 
 Upon further inspection is seems the source the of crash is here: 
 nrf_dfu_settings_init();
 
 Drilling down, I discovered it seems to be hanging on: 
 wait_for_queue();
 
 I'm using nRF5_SDK_12.2.0 
 I can prevent it hanging by increasing this constant: 
 FS_QUEUE_SIZE
 
 However, it no longer advertises correctly because of: 
 // Delay starting advertising until the flash operations are complete.
if (flash_access_in_progress())
{
 m_advertising_start_pending = true;
 return NRF_SUCCESS;
}

ypearson · Accepted Answer

The problem is mainly due to the inability to re-init the flash whilst you have pending flash operations (from peer manager and DFU init). They need to be handled before attempting a re-init. Also if you are using freertos you need to modify: 
 app_timer_create()
 
 Here is the fix that seems to be working for me: 
 static uint8_t is_flash_busy(void) {

uint32_t count;

fs_queued_op_count_get(&count);

return (count!=0);}

static void pre_ble_reinit(void) {

while(is_flash_busy())
 {
 while (pdFALSE == xSemaphoreTake(m_ble_event_ready, portMAX_DELAY));

 intern_softdevice_events_execute();
 }}

wait_for_queue() hangs on re-init of DFU service

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