On Arch Linux, NRGEditor crashes with a segmentation fault upon unpacking a project.
(gdb) bt
#0  __pthread_clockjoin_ex (threadid=0, thread_return=0x0, clockid=0,
    abstime=0x0, block=true) at pthread_join_common.c:43
#1  0x0000000000f16e6a in ThreadStop ()
#2  0x0000000000f16e90 in ThreadDestroy ()
#3  0x00000000005ef6d6 in IdeShutdown ()
#4  0x000000000058310d in switchProfile ()
#5  0x0000000000583260 in drawFrame ()
#6  0x000000000058235b in EGLwindowRenderLoop ()
#7  0x000000000057ffce in main ()
linux-vdso.so.1 (0x00007f4709574000)
libGL.so.1 => /usr/lib/libGL.so.1 (0x00007f4709489000)
libX11.so.6 => /usr/lib/libX11.so.6 (0x00007f4709346000)
libOpenAL.so => ./libOpenAL.so (0x00007f4709282000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f4709000000)
libm.so.6 => /usr/lib/libm.so.6 (0x00007f4708f13000)
libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007f4708eee000)
libc.so.6 => /usr/lib/libc.so.6 (0x00007f4708d04000)
/lib64/ld-linux-x86-64.so.2 => /usr/lib64/ld-linux-x86-64.so.2 (0x00007f4709576000)
libGLdispatch.so.0 => /usr/lib/libGLdispatch.so.0 (0x00007f4708c4c000)
libGLX.so.0 => /usr/lib/libGLX.so.0 (0x00007f4708c1a000)
libxcb.so.1 => /usr/lib/libxcb.so.1 (0x00007f4708bef000)
libXau.so.6 => /usr/lib/libXau.so.6 (0x00007f470927b000)
libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0x00007f4708be5000)
This happens both with the official pre-built Linux version and with a fresh build off of the latest stable source. Please advise.

Can you give it a shot on ubuntu with in debug with GDB enabled... and tell me which line cause the crash specifically. Also I  would like to know which .npk you are trying to extract. Do not try to extract the publishing NPK, they are not NRG project files just source code and libraries used by the publishing phase to output a stand alone executable.

Turns out that it crashes on starting a new project as well.
__pthread_clockjoin_ex (threadid=0, thread_return=0x0, clockid=0, abstime=0x0, block=true) at pthread_join_common.c:43
Backtrace indicates that it occurs in IdeShutdown() call in switchProfile() call in drawFrame() in EGLwindowRenderLoop()

Ho! For that I would suggest you to use either Visual Studio Code or Code Blocks they would do all the work for you if you are not too familiar with using cmake directly. However what you can do it from the command line ie:

mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Debug ..
make

ps: Join us on discord if you need further help ;)

Honestly the crash seems to happen in you pthread library... :(

Try to fence the call preventing handles of 0x0 (if any) to don't join:
void ThreadStop( Thread *thread )
{
    thread->next_state = kStop;

    if( thread->handle )
    {
        pthread_join(thread->handle,
                    NULL);
    }
   
    memset( &thread->handle,
            0,
            sizeof( pthread_t ) );
}
pthread should be standard, however it seems that from distro. to distro. it behaves slightly differently...