Devuan bug report logs - #929
libfastjson4 linked without -lm causes segfault in rsyslog with libc6 2.42

Package: libfastjson-dev; Maintainer for libfastjson-dev is (unknown); Source for libfastjson-dev is src:libfastjson.

Affects: rsyslog

Reported by: "Dimitris T." <dimitris@stinpriza.org>

Date: Thu, 4 Dec 2025 12:18:01 UTC

Severity: grave

Tags: debian

Forwarded to https://bugs.debian.org/1114612

Full log

Message #13 received at 929@bugs.devuan.org (full text, mbox, reply):

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Date: Thu, 4 Dec 2025 13:44:01 +0000
From: Mark Hindley <mark@hindley.org.uk>
To: "Dimitris T." <dimitris@stinpriza.org>, 929@bugs.devuan.org
Subject: Re: bug#929: rsyslog: segfaults with latest libc6 (2.42-4)
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References: <176485054505.3039.12364368063517979913.reportbug@louise.lan>
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X-Debbugs-No-Ack: No Thanks

Dimitris

Thanks.

On Thu, Dec 04, 2025 at 02:15:45PM +0200, Dimitris T. wrote:
> Package: rsyslog
> Version: 8.2510.0-5devuan1
> Severity: grave
> Justification: renders package unusable
> 
> Hey,
> since upgrading libc6 today, rsyslog fails with following message : 
> 
> # /usr/sbin/rsyslogd -n -iNONE
> /usr/sbin/rsyslogd: Relink `/usr/lib/x86_64-linux-gnu/libfastjson.so.4' with `/usr/lib/x86_64-linux-gnu/libm.so.6' for IFUNC symbol `modf'
> Segmentation fault

I have to admit to not understanding fully the intricacies of the linking and
symbols here.

There is an apparently equivalent Gentoo bug[1] that suggests this should be
resolved in libfastjson4. In other words it is for Debian to resolve.

Let me do some more research.

Mark

[1]  https://bugs.gentoo.org/961289

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Devuan bug report logs - #929 libfastjson4 linked without -lm causes segfault in rsyslog with libc6 2.42

Devuan bug report logs - #929
libfastjson4 linked without -lm causes segfault in rsyslog with libc6 2.42