Null pointer when flashing a sdimg.bz2 image

[jakakordez]

When I try to flash my board using a .sdimg.bz2 image, the flashing almost every time halts. I cloned the project and ran it with Visual Studio and I found out that there is a null pointer in the g_filebuffer_map of libuuu/buffer.cpp which causes a read access violation. I verified that null is never stored into the map explicitly in buffer.cpp:1211.

My system is Windows 11 and I am flashing an i.MX8M Plus board.
The problem is also that when uuu.exe is ran directly, without a debugger attached and that happens, the flashing procedure just freezes without any error message to the user.

[nxpfrankli]

What's size of your bz2? And how do you create bz2, by pbzip2 or bzip2? Suggest switch to use zstd.

[jakakordez]

The original sdimg is 7GB, compressed to bz2 is 137 MB. Image is produced using the Yocto build so I am not sure which compression tool is used internally.