Bug#1093776: perl: occasionally hangs and no longer responds to trapped signals

[Vincent Lefevre]

Package: perl
Version: 5.36.0-7+deb12u1
Severity: normal

I have a Perl script that hung twice. Some signals are trapped
in the following way:

$SIG{'INT'} = sub
  { maplepid and quitmaple;
    $SIG{'PIPE'} = 'DEFAULT';
    warn "Interrupt\n";
    exit; };
$SIG{'QUIT'} = sub
  { maplepid and quitmaple;
    $SIG{'PIPE'} = 'DEFAULT';
    warn "Quit\n";
    $SIG{'QUIT'} = 'DEFAULT';
    kill 'QUIT', $$; };

While strace shows that perl received these signals, perl doesn't
output anything (note: maplepid returns undef) and these signals
are completely ignored.

Note that this issue is rather rare: the script is running
continuously, the this issue occurred twice in several months.

-- System Information:
Debian Release: 12.9
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.1.0-30-amd64 (SMP w/28 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=C.UTF-8, LC_CTYPE=C.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 perl depends on:
ii  dpkg               1.21.22
ii  libperl5.36        5.36.0-7+deb12u1
ii  perl-base          5.36.0-7+deb12u1
ii  perl-modules-5.36  5.36.0-7+deb12u1

Versions of packages perl recommends:
ii  netbase  6.4

Versions of packages perl suggests:
pn  libtap-harness-archive-perl                             <none>
pn  libterm-readline-gnu-perl | libterm-readline-perl-perl  <none>
ii  make                                                    4.3-4.1
ii  perl-doc                                                5.36.0-7+deb12u1

-- no debconf information

-- 
Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)