mpv zsh completion hangs with specially crafter dirnames

[Patola]

This is regarding /usr/share/zsh/vendor-completions/_mpv which is in the package "mpv".

If you make a dirname with lots of dots and open bracket and close bracket, like:

/tmp/XXX.X.X.X.X.X.XX.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.XX-X.X.X.X.X.X.X[XXXXX]

Put some media files inside, and try to autocomplete with:

mpv /tmp/XXX.X.X.X.X.X.XX.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.XX-X.X.X.X.X.X.X\[XXXXX\]/<TAB>

zsh gets into a loop that depending on the disk might take dozens of minutes or hours to complete. In a network file system it might practically hangs forever. Using zsh -xv to check the completion I see that the completion has increasingly bigger hangs after this part repeats:

+compadd:9> PREFIX='(#a20)/tmp/XXX.X.X.X.X.X.XX.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.XX-X.X.X.X.X.X.X\[XXXXX\]/'
+compadd:12> (( 1 && 5 ))
+compadd:13> _correct_expl[_correct_group]=-J
+compadd:15> compadd -J corrections -X '- corrections - (errors 20})' -S '' -J urls -X '- URL -' cdda:// rtmp:// rtsp:// https:// mms:// mmst:// mmshttp:// rtp:// httpproxy:// hls:// rtmpe:// rtmps:// rtmpt:// rtmpte:// rtmpts:// srtp:// data:// lavf:// ffmpeg:// udp:// ftp:// tcp:// tls:// unix:// sftp:// md5:// concat:// avdevice:// av:// dvb:// smb:// file:// dvdread:// file:// dvd:// dvdnav:// file:// bd:// br:// bluray:// bdnav:// brnav:// bluraynav:// memory:// hex:// null:// mf:// edl:// rar:// file:// fd:// fdclose://

The delay to get to the next part seems to increase exponentially. I am attaching an excerpt of the zsh -xv run. A similar symptom happens with mplayer but it does not take as long - a couple minutes instead of more than half an hour. After it finishes, it doesn't match any media file, although there are mkv files in there: No matches for: `video file', `media file', `URL', `URL prefix', or `corrections'

This does not seem to occur with any other programs, media or otherwise. For media players I tried ffmpeg kmplayer totem xine avconv avplay.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: mpv 0.27.2-1ubuntu1 [modified: usr/share/zsh/vendor-completions/_mpv]
ProcVersionSignature: Ubuntu 4.15.0-22.24-lowlatency 4.15.17
Uname: Linux 4.15.0-22-lowlatency x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.1
Architecture: amd64
CurrentDesktop: Unity:Unity7:ubuntu
Date: Thu Jun 7 05:41:36 2018
InstallationDate: Installed on 2018-01-08 (150 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
SourcePackage: mpv
UpgradeStatus: Upgraded to bionic on 2018-06-03 (4 days ago)

[Daniel van Vugt (vanvugt)]

The bug report seems to say you have modified the file. What have you modified it to?

Package: mpv 0.27.2-1ubuntu1 [modified: usr/share/zsh/vendor-completions/_mpv]

[Patola (patola)]

Sorry for that. I was trying a few things to get rid of that problem and I forgot to take it back.
I copied it elsewhere and I reinstated the original package version. This is the diff:

[6:50] [3323] [patola@risadinha patola]% diff /home/patola/_mpv /usr/share/zsh/vendor-completions/_mpv
974c974
< _requested files expl 'media file' _files -g "*.(#i)(asf|asx|avi|flac|flv|m1v|m2p|m2v|m4a|m4v|mjpg|mka|mkv|mov|mp3|mp4|mpe|mpeg|mpg|ogg|ogm|ogv|opus|qt|rm|ts|vob|wav|webm|wma|wmv)(-.)" && rc=0
---
> _requested files expl 'media file' _files && rc=0
978c978
< compadd -S '' "$expl[@]" {cdda,rtmp,rtsp,https,mms,mmst,mmshttp,rtp,httpproxy,hls,rtmpe,rtmps,rtmpt,rtmpte,rtmpts,srtp,data,lavf,ffmpeg,udp,ftp,tcp,tls,unix,sftp,md5,concat,avdevice,av,dvb,smb,file,dvdread,file,dvd,dvdnav,file,bd,br,bluray,bdnav,brnav,bluraynav,memory,hex,null,mf,edl,rar,file,fd,fdclose}:// && rc=0
---
> compadd -S '' "$expl[@]" cdda:// rtmp:// rtsp:// http:// https:// mms:// mmst:// mmsh:// mmshttp:// rtp:// httpproxy:// hls:// rtmpe:// rtmps:// rtmpt:// rtmpte:// rtmpts:// srtp:// data:// lavf:// ffmpeg:// udp:// ftp:// tcp:// tls:// unix:// sftp:// md5:// concat:// avdevice:// av:// dvb:// smb:// file:// dvdread:// file:// dvd:// dvdnav:// file:// bd:// br:// bluray:// bdnav:// brnav:// bluraynav:// memory:// hex:// null:// mf:// edl:// rar:// file:// fd:// fdclose:// && rc=0
[6:50] [3324] [patola@risadinha patola]%

The behaviour is the same with my modified file and the original too.

[Patola (patola)]

/home/patola/_mpv is my modified version and /usr/share/zsh/vendor-completions/_mpv is the original, BTW

[Patola (patola)]

Any news on that? Bug continues to this day.