Comment 1 for bug 1840704

Test Build 1) Old behavior

goal: show limitations/issues.

- original packaging
- zfs not built with debug symbols
- zfs modules not present in debug package
- extra modules lack .gnu_debuglink section

Original packaging:

There are no ZFS modules in the debug package:

 $ dpkg-deb -x linux-image-unsigned-5.3.0-8-generic-dbgsym_5.3.0-8.9_amd64.ddeb ddeb-orig

 $ ls ddeb-orig/usr/lib/debug/lib/modules/5.3.0-8-generic/kernel/zfs
 ...: No such file or directory

Accordingly, the ZFS modules are the only modules without '.gnu_debuglink' section in the 'linux-modules' package:

 $ dpkg-deb -x linux-modules-5.3.0-8-generic_5.3.0-8.9_amd64.deb deb-modules

 $ find deb-modules/ -name '*.ko' | while read ko; do objdump -h -j .gnu_debuglink $ko >/dev/null 2>&1 || echo "Module without debug link '$ko'"; done
 Module without debug link 'deb-modules/lib/modules/5.3.0-8-generic/kernel/zfs/icp.ko'
 Module without debug link 'deb-modules/lib/modules/5.3.0-8-generic/kernel/zfs/spl.ko'
 Module without debug link 'deb-modules/lib/modules/5.3.0-8-generic/kernel/zfs/zavl.ko'
 Module without debug link 'deb-modules/lib/modules/5.3.0-8-generic/kernel/zfs/zcommon.ko'
 Module without debug link 'deb-modules/lib/modules/5.3.0-8-generic/kernel/zfs/zfs.ko'
 Module without debug link 'deb-modules/lib/modules/5.3.0-8-generic/kernel/zfs/zlua.ko'
 Module without debug link 'deb-modules/lib/modules/5.3.0-8-generic/kernel/zfs/znvpair.ko'
 Module without debug link 'deb-modules/lib/modules/5.3.0-8-generic/kernel/zfs/zunicode.ko'

By the way, this is also the case for *all* modules in the 'linux-modules-extra' package:
(only modules in the 'linux-modules' package have '.gnu_debuglink' sections).

 $ dpkg-deb -x linux-modules-extra-5.3.0-8-generic_5.3.0-8.9_amd64.deb deb-modules-extras

 $ find deb-modules-extras/ -name '*.ko' | wc -l
 4508

 $ find deb-modules-extras/ -name '*.ko' | while read ko; do objdump -h -j .gnu_debuglink $ko >/dev/null 2>&1 || echo "Module without debug link '$ko'"; done | wc -l
 4508