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

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Control: reassign -1 libfastjson-dev
Control: retitle -1 libfastjson4 linked without -lm causes segfault in rsyslog with libc6 2.42
Control: tags -1 debian
Control: affects -1 rsyslog
Control: forwarded -1 https://bugs.debian.org/1114612

Dimitris,

The issue appears to be lack of -lm linkage after a change in libc6 modf()
implementation in 2.42. However, it is only triggered in rsyslog builds without
systemd (hence only reports from  Devuan, Gentoo and Artix.)

It is fixed in libfastjson upstream[1]. Src:libfastjson is not forked in Devuan
and I have reopened the existing Debian bug[2] to request the fix be cherry-picked.

Mark

[1]  https://github.com/rsyslog/libfastjson/pull/167

[2]  https://bugs.debian.org/1114612

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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