You seem to have hit a bug in the exFAT code.
I would advise taking the external drive to a different computer, such as for example a Windows PC. Run chkdisk (or fsck on Linux), and the file system back in shape.
Afterwards you should be able to continue using the drive on your Mac.
If not, I would suggest using a different computer to copy away your ...
The handling of coredumps has changed on Mojave, so you cannot use "otool -c" as you did on older macOS versions. Instead you open the Terminal and run the following command:
lldb -c /cores/core.12345
where 12345 needs to be replaced by the actual filename of your coredump file.
When lldb has started up, you'll get an (lldb) prompt, where you enter the ...
I fixed the crash, the problem seems to be caused by a problem in the kext of the Thunderbolt port.
Steps to fix it:
reboot with CMD+R pressed.
sudo csrutil disable
reboot in normal mode
sudo mv /System/Library/Extensions/AppleThunderboltNHI.kext /System/Library/Extensions/AppleThunderboltNHI.kext.BAK
reboot with CMD+R pressed
Welcome @user65526! So, generally speaking, more information is needed for something like this. The closest I can guess is: some kernel extension, possible related to a graphics card or external video display (?) is getting hung up with Apple's "Power Nap" feature, also known as darkwake[s]. I'd recommended disabling the feature entirely, by entering in ...
I'd try running in safe mode. See if problem persists. Try a safe boot. Shutdown your machine. Hold down the shift key. Poweron. The boot up will take longer than normal because the filesystem on the startup drive is being checked and repaired as needed. All about safe mode including what features and apps safe boot leaves out. Safe boot uses a software ...
Back up your machine, and try this: https://www.tonymacx86.com/threads/imovie-crashes-on-startup-mojave.267438/
Basically, delete the Prographics Framework. If it works, no need to restore, if it does something even nastier, restore and look elsewhere :)