[Pkg-zsh-devel] Bug#927470: zsh: Segfault on completion menu in large git repo's

[Wesley Schwengle]

Package: zsh
Version: 5.7.1-1
Severity: important
Tags: upstream

Dear Maintainer,

ZSH seems to segfault in the following scenario in larger git
repositories:

```
vi Zaaksysteem::Bar::voo::vooo::voo<tab><ctrl-c>
# you'll receive the following message: Killed by signal in compadd after 0s
vi <tab>
# segfault
```

Steps to reproduce this:

* cd /tmp
* git clone git at github.com:git/git.git
* cd git
* zsh -f
* Set the following options:

```
autoload -Uz compinit

zstyle ':completion:*' completer _complete _match _approximate
zstyle ':completion:*:match:*' original only
zstyle ':completion:*:approximate:*' max-errors 1 numeric
zstyle ':completion:*' menu select
zstyle -e ':completion:*:approximate:*' \
    max-errors 'reply=($((($#PREFIX+$#SUFFIX)/3))numeric)'

zstyle ':completion:*' squeeze-slashes true

_ZCOMP=${ZDOTDIR:-$HOME}/.zcompdump
today=$(date --date '00:00 today' +%s)
if [[ ! -e $_ZCOMP || $today -gt $(stat --format %Y $_ZCOMP) ]];
then
    compinit -i
    touch ${_ZCOMP}
else
    compinit -C;
fi
unset _ZCOMP
```

* now execute the following commands
```
vi Zaaksysteem::Bar::voo::vooo::voo<tab><ctrl-c>
# you'll receive the following message: Killed by signal in compadd after 0s
vi <tab>
# segfault
```

I've submitted this bug already to upstream[1].

Cheers,
Wesley


[1]: http://www.zsh.org/mla/workers/2019/msg00251.html


-- Package-specific info:

Packages which provide vendor completions:

Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name             Version                     Architecture Description
+++-================-===========================-============-========================================================
ii  curl             7.64.0-2                    amd64        command line tool for transferring data with URL syntax
ii  docker-ce-cli    5:18.09.5~3-0~debian-buster amd64        Docker CLI: the open-source application container engine
ii  git-buildpackage 0.9.14                      all          Suite to help with Debian packages in Git repositories
ii  lastpass-cli     1.3.2-1                     amd64        command line interface to LastPass.com
ii  mpv              0.29.1-1                    amd64        video player based on MPlayer/mplayer2
ii  pulseaudio       12.2-4                      amd64        PulseAudio sound server
ii  systemd          241-3                       amd64        system and service manager
ii  udev             241-3                       amd64        /dev/ and hotplug management daemon
ii  vlc-bin          3.0.6-1                     amd64        binaries from VLC
ii  youtube-dl       2019.01.17-1                all          downloader of videos from YouTube and other sites

dpkg-query: no path found matching pattern /usr/share/zsh/vendor-functions/


-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (500, 'testing'), (300, 'unstable'), (50, 'experimental'), (10, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-4-amd64 (SMP w/8 CPU cores)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages zsh depends on:
ii  libc6       2.28-8
ii  libcap2     1:2.25-2
ii  libtinfo6   6.1+20181013-2
ii  zsh-common  5.7.1-1

Versions of packages zsh recommends:
ii  libc6         2.28-8
ii  libncursesw6  6.1+20181013-2
ii  libpcre3      2:8.39-12

Versions of packages zsh suggests:
pn  zsh-doc  <none>

-- no debconf information