Comment 23 for bug 1864992

I don't think this is duplicate either. I agree that this seems to be in the kernel, but don't yet have proof. If I compile the mainline kernel (5.6-rc4) myself i get this error 5600 times (once per module):

depmod: ERROR: ../libkmod/libkmod.c:515 lookup_builtin_file() could not open builtin file '/home/doug/temp-k-git/linux/debian/linux-image/lib/modules/5.6.0-rc4-stock/modules.builtin.bin'

but the file is there (well, afterwards at least).
I didn't notice this with kernel 5.6-rc2, but might not have been looking.