linux-kernel - Re: [PATCH glibc 5/9] glibc: Perform rseq(2) registration at C startup and thread creation (v17)

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Date:   Wed, 29 Apr 2020 10:18:08 +0200
From:   Florian Weimer <fw@...eb.enyo.de>
To:     Szabolcs Nagy <szabolcs.nagy@....com>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        libc-alpha <libc-alpha@...rceware.org>,
        carlos <carlos@...hat.com>, Rich Felker <dalias@...c.org>,
        linux-api <linux-api@...r.kernel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Will Deacon <will.deacon@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ben Maurer <bmaurer@...com>, Dave Watson <davejwatson@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul <paulmck@...ux.vnet.ibm.com>, Paul Turner <pjt@...gle.com>,
        Joseph Myers <joseph@...esourcery.com>
Subject: Re: [PATCH glibc 5/9] glibc: Perform rseq(2) registration at C startup and thread creation (v17)

* Szabolcs Nagy:

> The 04/28/2020 10:58, Mathieu Desnoyers wrote:
>> ----- On Apr 28, 2020, at 8:54 AM, Florian Weimer fw@...eb.enyo.de wrote:
>> > That one definitely should work.
>> > 
>> > I expect you might see this if libgcc_s.so.1 is installed into a
>> > multiarch subdirectory that upstream glibc does not search.  (The
>> > Debian patches are unfortunately not upstream.)
>> 
>> My test environment is a Ubuntu 18.04.1 LTS.
>> 
>> > 
>> > I think on my system, the built glibc can find the system libgcc_s via
>> > /etc/ld.so.cache, so I haven't seen this issue yet.
>> 
>> On my system, libgcc_s is provided here:
>> 
>> /lib/x86_64-linux-gnu/libgcc_s.so.1
>> 
>> by this package:
>> 
>> Package: libgcc1
>> Architecture: amd64
>> Version: 1:8.4.0-1ubuntu1~18.04
>
> before running the tests
>
> cp `$CC --print-file-name libgcc_s.so.1` glibc/build/dir
> cp `$CC --print-file-name libstdc++.so.6` glibc/build/dir
>
> so those toolchain libs are in the search path
> of the newly built libc when running tests.

Do you actually see the need for these steps yourself?

I guess the correct fix would be to upstream the Debian multiarch
changes and activate them automatically with a configure check on
systems that use multiarch paths.