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
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https://bugs.launchpad.net/bugs/1840704
Title:
ZFS kernel modules lack debug symbols
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