Bug#1000843: exim4: set message_id_header_domain cause SIGSEGV (maybe attempt to write to immutable memory)

[Youhei SASAKI]

Package: exim4
Version: 4.95-2
Severity: important
X-Debbugs-Cc: none, Youhei SASAKI <uwabami at gfd-dennou.org>

Dear Maintainer,

When I set 'message_id_header_domain', 'message_id_header_text'
in /etc/exim4/exim4.conf.localmacros,

    % sendmail -t < test
    2021-11-30 14:50:47 1mrw2R-000EV4-KH SIGSEGV (maybe attempt to write to
    immutable memory)
    55742 segmentation fault  sendmail -t < test

If I remove these parameter, just fine.

Best Wishes,
Youhei

-- System Information:
Debian Release: bookworm/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 5.15.0-2-amd64 (SMP w/4 CPU threads)
Kernel taint flags: TAINT_USER, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=ja_JP.UTF-8, LC_CTYPE=ja_JP.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages exim4 depends on:
ii  debconf [debconf-2.0]  1.5.79
ii  exim4-base             4.95-2
ii  exim4-daemon-light     4.95-2

exim4 recommends no packages.

exim4 suggests no packages.

-- debconf information:
  exim4/drec: