Bug 585106 – sys-kernel/dracut-044 and sys-devel/prelink-20151030: /usr/sbin/prelink: error while loading shared libraries: libelf.so.1: cannot open shared object file: No such file or directory

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Martin von Gagern 2016-06-05 13:10:20 UTC]

Dracut fails to prelink the initramfs on my system, because the prelink binary requires libelf.so.1 which is not installed by the dracut script.

dracut: *** Resolving executable dependencies ***
dracut: *** Resolving executable dependencies done***
dracut: *** Pre-linking files ***
/usr/sbin/prelink: error while loading shared libraries: libelf.so.1: cannot open shared object file: No such file or directory
dracut: *** Pre-linking files done ***
dracut: *** Stripping files ***
dracut: *** Stripping files done ***

The corresponding dracut code reads thus:

        dinfo "*** Pre-linking files ***"
        inst_multiple -o prelink /etc/prelink.conf /etc/prelink.conf.d/*.conf
        chroot "$initdir" "$PRELINK_BIN" -a
        rm -f -- "$initdir/$PRELINK_BIN"
        rm -fr -- "$initdir"/etc/prelink.*
        dinfo "*** Pre-linking files done ***"

So apparently it lists the files prelink will probably need, does the prelink step, then uninstalls said files again. But it misses the libelf reported by ldd:

# ldd /usr/sbin/prelink 
	linux-vdso.so.1 (…)
	libelf.so.1 => /usr/lib64/libelf.so.1 (…)
	libc.so.6 => /lib64/libc.so.6 (…)
	libz.so.1 => /lib64/libz.so.1 (…)
	/lib64/ld-linux-x86-64.so.2 (…)

I think `dracut-install --ldd` (or some shell function invoking this, e.g. `DRACUT_RESOLVE_DEPS=1 inst_multiple`) should be able to install the prelink binary with all accompanying files. But cleaning that up again might be tricky. So I'm not sure this can reasonably be addressed at the distribution level. Let me know whether I should forward this issue upstream, and if so, which upstream channel you'd suggest.

[Comment 1 Martin von Gagern 2016-08-21 16:27:01 UTC]

I've just reported this upstream at GitHub:
https://github.com/dracutdevs/dracut/issues/152

[Comment 2 Massimo Burcheri 2017-10-21 08:45:38 UTC]

Is dracut currently working for Gentoo in this state?

dracut development does not care much about Gentoo and even less about OpenRC, reading the upstream ticket neither about prelink.
But there is already a patch provided upstream, just not pulled yet. I adapted that patch to Gentoo, tested and working. Could we already apply that?

[Comment 3 Massimo Burcheri 2017-10-21 08:46:18 UTC]

Created attachment 499518 [details, diff]
dracut patch for prelink

[Comment 4 Peter Levine 2017-12-25 02:45:39 UTC]

Running with DRACUT_RESOLVE_DEPS=1 works for me on sys-kernel/dracut-046. 

I.e., something like:

> DRACUT_RESOLVE_DEPS=1 dracut --kver 4.14.8-gentoo-r1 -f --early-microcode --strip --prelink -H

[Comment 5 Peter Levine 2017-12-25 04:28:33 UTC]

(In reply to Peter Levine from comment #4)
> Running with DRACUT_RESOLVE_DEPS=1 works for me on sys-kernel/dracut-046. 
> 
> I.e., something like:
> 
> > DRACUT_RESOLVE_DEPS=1 dracut --kver 4.14.8-gentoo-r1 -f --early-microcode --strip --prelink -H

Actually, I can confirm that https://github.com/dracutdevs/dracut/commit/ed9281d6d13b6250e3f12408366fca46bc3384ce fixes the aforementioned error message.  The only message I get now is about e2fsck, but I don't think it's fatal.  


> dracut: *** Pre-linking files ***
> /usr/sbin/prelink: /sbin/e2fsck: COPY relocations don't point into .bss or .sbss section
> dracut: *** Pre-linking files done ***

[Comment 6 Larry the Git Cow 2018-03-09 19:08:35 UTC]

The bug has been closed via the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=4c3cc2518e9a02a232005dda2f4f136e7c008475

commit 4c3cc2518e9a02a232005dda2f4f136e7c008475
Author:     Alexander Tsoy <[e-mail]>
AuthorDate: 2018-03-06 16:40:24 +0000
Commit:     Michał Górny <[e-mail]>
CommitDate: 2018-03-09 19:08:31 +0000

    sys-kernel/dracut: bump to 047
    
    Closes: https://bugs.gentoo.org/585106
    Closes: https://bugs.gentoo.org/648508
    Closes: https://github.com/gentoo/gentoo/pull/7320

 sys-kernel/dracut/Manifest          |   1 +
 sys-kernel/dracut/dracut-047.ebuild | 151 ++++++++++++++++++++++++++++++++++++
 2 files changed, 152 insertions(+)