Re: pkg/60171: mpv quickly segfaults when using libcaca video output

["Leonardo Taccari via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR pkg/60171; it has been noted by GNATS.

From: Leonardo Taccari <leot%NetBSD.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: pkg/60171: mpv quickly segfaults when using libcaca video output
Date: Sun, 05 Apr 2026 12:15:53 +0200

 Hello Daniel,
 thanks for the PR!
 
 opensauce04%gmail.com@localhost via gnats writes:
 > >Number:         60171
 > >Category:       pkg
 > >Synopsis:       mpv quickly segfaults when using libcaca video output
 > >Confidential:   no
 > >Severity:       serious
 > >Priority:       high
 > >Responsible:    pkg-manager
 > >State:          open
 > >Class:          sw-bug
 > >Submitter-Id:   net
 > >Arrival-Date:   Thu Apr 02 18:45:00 +0000 2026
 > >Originator:     Daniel
 > >Release:        NetBSD 11.0_RC2 / pkgsrc 2026Q1
 > >Organization:
 > >Environment:
 > NetBSD netbook.powerhub 11.0_RC2 NetBSD 11.0_RC2 (GENERIC) #0: Wed Mar  4 21:02:00 UTC 2026  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
 > >Description:
 > When attempting to play a video via mpv using the libcaca video option via `mpv --vo=caca <url>`, I receive the following message:
 >
 > zsh: segmentation fault (core dumped)  mpv --vo=caca <url>
 >
 > I don't receive this message with the same video when using either the default or tct video output options, so this issue seems specific to the --vo=caca.
 >
 > libcaca support must be explicitly enabled before building mpv by adding the following to mk.conf:
 >
 > PKG_OPTIONS.mpv = caca
 > >How-To-Repeat:
 > Attempt to play a video with mpv while using the `--vo-caca` option, ensuring that mpv is built with libcaca support.
 > >Fix:
 >
 
 Adding some more info... It seems that I can reproduce that too with
 NetBSD -current(ish) and pkgsrc-current and here the initial backtrace:
 
  [...]
  Core was generated by `mpv'.
  Program terminated with signal SIGSEGV, Segmentation fault.
  #0  0x000075746a002384 in ti_getnum () from /usr/lib/libterminfo.so.1
  [Current thread is 1 (process 11304)]
  (gdb) bt
  #0  0x000075746a002384 in ti_getnum () from /usr/lib/libterminfo.so.1
  #1  0x000075746aa6d76e in _nc_locale_breaks_acs () from /usr/pkg/lib/libncurses.so.6
  #2  0x000075746aa55117 in _nc_setupscreen_sp () from /usr/pkg/lib/libncurses.so.6
  #3  0x000075746aa50585 in newterm_sp () from /usr/pkg/lib/libncurses.so.6
  #4  0x000075746aa509b0 in newterm () from /usr/pkg/lib/libncurses.so.6
  #5  0x000075746aa4c6d2 in initscr () from /usr/pkg/lib/libncurses.so.6
  #6  0x000075746ce4e303 in ncurses_init_graphics (dp=0x757465dc1000) at driver/ncurses.c:253
  #7  0x000075746ce3da9c in caca_install_driver (dp=dp@entry=0x757465dc1000, driver=driver@entry=0x0) at caca.c:318
  #8  0x000075746ce3dbfb in caca_create_display_with_driver (cv=0x757465dcc000, driver=0x0) at caca.c:131
  #9  0x0000000000e72126 in preinit ()
  #10 0x0000000000e4cb96 in vo_thread ()
  #11 0x000075746dbc336f in pthread__create_tramp (cookie=0x757467d06800) at /usr/src/lib/libpthread/pthread.c:607
  #12 0x000075746c96df60 in ?? () from /usr/lib/libc.so.12
  Backtrace stopped: Cannot access memory at address 0x7574611f0000
 
 I should try to rebuild more packages via:
 
  make install CFLAGS=-g2 INSTALL_UNSTRIPPED=yes
 
 To possibly have more helpful debug information.