I got hit with this Issue too. I suspect a common factor is that X server to which mythtv-setup is being forward is hosted on 12.04.
The Problem only arose after and update on the the mythtv client side to 12.04 from 11.10, The server is (for now) still an 11.10 host. the -- You received this bug notification because you are a member of UBUNTU - AL - BR, which is subscribed to Mythbuntu. https://bugs.launchpad.net/bugs/995941 Title: mythtv-setup.real assert failure: *** glibc detected *** /usr/bin /mythtv-setup.real: malloc(): memory corruption: 0x0000000001768480 *** Status in Mythbuntu, Ubuntu derivative focused upon MythTV: New Bug description: Attempting to run mythtv-setup -O ThemePainter=qt over an ssh -X connection causes myhtv-setup.real to crash with a memory corruption error. The problem also occurs if I don't specify the Theme Painter manually (Michael T. Dean suggested that I do so). Mythtv-setup works fine when I go over to the machine and run it there. root@zotac:~# mythbackend --version Please attach all output as a file in bug reports. MythTV Version : v0.24.2-30-ge9a0ecb MythTV Branch : fixes/0.24 Network Protocol : 63 Library API : 0.24.20110505-1 QT Version : 4.7.2 Options compiled in: linux profile using_alsa using_oss using_pulse using_pulseoutput using_backend using_bindings_perl using_bindings_python using_crystalhd using_dvb using_firewire using_frontend using_hdhomerun using_hdpvr using_iptv using_ivtv using_joystick_menu using_lirc using_mheg using_opengl_video using_opengl_vsync using_qtdbus using_qtwebkit using_v4l using_x11 using_xrandr using_xv using_bindings_perl using_bindings_python using_mythtranscode using_opengl using_vdpau using_ffmpeg_threads using_live using_mheg ProblemType: Crash DistroRelease: Ubuntu 11.04 Package: mythtv-backend 2:0.24.2+fixes.20120409.e9a0ecb-0ubuntu0mythbuntu3 ProcVersionSignature: Ubuntu 2.6.38-14.58-generic 2.6.38.8 Uname: Linux 2.6.38-14-generic x86_64 Architecture: amd64 AssertionMessage: *** glibc detected *** /usr/bin/mythtv-setup.real: malloc(): memory corruption: 0x0000000001768480 *** CrashDB: mythbuntu Date: Mon May 7 14:56:27 2012 ExecutablePath: /usr/bin/mythtv-setup.real Installed_mythtv_dbg: 2:0.24.2+fixes.20120409.e9a0ecb-0ubuntu0mythbuntu3 ProcCmdline: /usr/bin/mythtv-setup.real -O ThemePainter=qt ProcEnviron: LANG=en_GB.UTF-8 SHELL=/bin/bash Signal: 6 SourcePackage: mythtv StacktraceTop: raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64 abort () at abort.c:92 __libc_message (do_abort=2, fmt=0x7fed927230a0 "*** glibc detected *** %s: %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:189 malloc_printerr (av=0x7fed9295d1c0, bytes=<value optimised out>) at malloc.c:6283 _int_malloc (av=0x7fed9295d1c0, bytes=<value optimised out>) at malloc.c:4396 Title: mythtv-setup.real assert failure: *** glibc detected *** /usr/bin/mythtv-setup.real: malloc(): memory corruption: 0x0000000001768480 *** UpgradeStatus: Upgraded to natty on 2012-03-18 (50 days ago) UserGroups: adm admin cdrom dialout kvm libvirtd lpadmin mythtv plugdev sambashare To manage notifications about this bug go to: https://bugs.launchpad.net/mythbuntu/+bug/995941/+subscriptions -- Mailing list: https://launchpad.net/~linux-traipu Post to : [email protected] Unsubscribe : https://launchpad.net/~linux-traipu More help : https://help.launchpad.net/ListHelp

