OTG_HS_IRQHandler goes crazy when running CDC host and device simultaneously on STM32F446

[ban241]

I'm working with an ST NUCLEO -F 446ZE (STM32F446ZE microcontroller) development board and I'm a complete beginner when it comes to USB. My goal is make a VCP (Virtual Com Port) tunnel, where PA11/PA12 (OTG_FS) act as device and PB14/PB15 (OTG_HS) act as a host. I'm using FreeRTOS and the problem I'm seeing is that OTG_HS_IRQHandler goes crazy (10-39 microseconds in between consecutive interrupts) whenever I plug in a device to PB14/PB15, which means there is no CPU cycles left to do any other work. As soon as I unplug the device from PB14/PB15, then my microcontroller, including the USB device on PA11/PA12, works great again. The interrupts flags that are set in OTG_HS_IRQHandler are OTG_HS_HCINT, OTG_HS_SOF and OTG_HS_RXFLVL. Can someone please give me some advice on how I should tackle this or perhaps point me to a similar example that I use as a basis?