Freecad crashes at start

I can't reproduce this in a VM running the latest bionic daily build. Can you give more information on your setup?

This happens with "Gnome with X11" and not with "Gnome with Wayland"

My system is a Ryzen 1600.

See also https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=890882

I just recompiled from upstream git repo, and same problem.
(w/ X11)

I did:
$ lxc launch images:ubuntu/bionic/amd64 b
to get a fresh system, and followed the build instructions from https://www.freecadweb.org/wiki/CompileOnUnix

I used instructions from https://blog.simos.info/how-to-run-graphics-accelerated-gui-apps-in-lxd-containers-on-your-ubuntu-desktop/ to get an lxc image that has accelerated X11 access, glxinfo and xclock run ok.

I tried adding XInitThreads() into main() before Gui::Application::runApplication(), but no change.

The bt is:

(gdb) bt
#0 0x00007ffff4379e97 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1 0x00007ffff437b801 in __GI_abort () at abort.c:79
#2 0x00007ffff436b39a in __assert_fail_base (fmt=0x7ffff44f27d8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x7ffff4d7f660 "!xcb_xlib_threads_sequence_lost", file=file@entry=0x7ffff4d7f4cb "../../src/xcb_io.c", line=line@entry=259, function=function@entry=0x7ffff4d7f908 "poll_for_event") at assert.c:92
#3 0x00007ffff436b412 in __GI___assert_fail (assertion=0x7ffff4d7f660 "!xcb_xlib_threads_sequence_lost", file=0x7ffff4d7f4cb "../../src/xcb_io.c", line=259, function=0x7ffff4d7f908 "poll_for_event")
    at assert.c:101
#4 0x00007ffff4d0d1da in () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#5 0x00007ffff4d0d28b in () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#6 0x00007ffff4d0d57d in _XEventsQueued () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#7 0x00007ffff4d103c5 in _XGetRequest () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#8 0x00007fffdefc4ee2 in () at /usr/lib/x86_64-linux-gnu/libGLX_mesa.so.0
#9 0x00007ffff2a06ff4 in () at /usr/lib/x86_64-linux-gnu/libQtOpenGL.so.4
#10 0x00007ffff298a8ad in QGLFormat::openGLVersionFlags() () at /usr/lib/x86_64-linux-gnu/libQtOpenGL.so.4
#11 0x00007ffff72e2a38 in Gui::Application::runApplication() () at /usr/local/lib/libFreeCADGui.so
#12 0x000055555555742b in main ()

Status changed to 'Confirmed' because the bug affects multiple users.

Same think happened on Lubuntu 18.04.

FreeCAD 0.16, Libs: 0.16R
© Juergen Riegel, Werner Mayer, Yorik van Havre 2001-2015
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failed to create drawable
[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
freecad: ../../src/xcb_io.c:259: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
Aborted (core dumped)

Same deal here, 18.04 on a Ryzen 7 2700U (laptop variant) Could be AMD/ryzen specific?

FreeCAD 0.16, Libs: 0.16R
© Juergen Riegel, Werner Mayer, Yorik van Havre 2001-2015
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  # ## #### #### # # # # #
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  # # #### #### # # # # #
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  # # #### #### ### # # #### ## ## ##

failed to create drawable
[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
freecad: ../../src/xcb_io.c:259: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
Aborted (core dumped)

I have the same problem. In the end I went down to kubuntu 16.04 I only have the problem in Ubuntu 18.04.
 In Ubuntu 16.04 and 17.10 I had no problem.

I have the same problem with the stock version of Freecad. I have just upgraded and Freecad stopped working.
The output is the same as described above... but I have installed Freecad 0.17 beta from the Ubuntu Software package and it seems to work when I launch it from a terminal with the freecad.FreeCAD command.

If Freecad was installed previously, delete or move the old config directory:

/home/USERxxx/snap/freecad/4/.config

hi Jens, hi all,
thanks a lot for answering. In my case I had a fresh install of Xubuntu
18.04, so there was no old .config there.

First I installes Xubuntu and after next step I downloaded freecad-0.17
and installed it via dpkg -i.

But I got these known error as described.

Now I have found another "script" like this here :
LIBGL_DRI3_DISABLE=true ./FreeCAD-13522.glibc2.17-x86_64.AppImage

and it does the trick. Now it runs.
So far, I cannot find any problems due to the disabled LIBGL_DR3.
Maybe in further using freecad some behavior may appear.

Bye hans
************************************

Am Sonntag, den 20.05.2018, 18:51 +0000 schrieb Jens:
> I have the same problem with the stock version of Freecad. I have
> just upgraded and Freecad stopped working.
> The output is the same as described above... but I have installed
> Freecad 0.17 beta from the Ubuntu Software package and it seems to
> work when I launch it from a terminal with the freecad.FreeCAD
> command.
>
> If Freecad was installed previously, delete or move the old config
> directory:
>
> /home/USERxxx/snap/freecad/4/.config
>

So, I think I've figured it out.

Found somewhere else on the net that disabling DRI3 on start seems to solve it.

Doing:

LIBGL_DRI3_DISABLE=true freecad

gets FreeCAD to start, with no error or fault.

Maybe the desktop entry needs updating? Or some other routines.

My hardware is RX480 on AMDGPU DC, running under a daily Mesa driver as well as a preliminary 4.17.

Don: thanks for finding the corresponding Debian bug report (comment #3). I've added a bug watch, so that this bug will be automatically notified once the status changes in Debian.

I have the same error.

Running 'LIBGL_DRI3_DISABLE=true freecad' seems to work.

I have an AMD A8-7600.

Same here. 'LIBGL_DRI3_DISABLE=true freecad' worked OK

Works for me too

Same problem using kubuntu-desktop on 18.04

Console output:

FreeCAD 0.16, Libs: 0.16R
© Juergen Riegel, Werner Mayer, Yorik van Havre 2001-2015
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  # # # # # #
  # ## #### #### # # # # #
  #### # # # # # # # ##### # #
  # # #### #### # # # # #
  # # # # # # # # # ## ## ##
  # # #### #### ### # # #### ## ## ##

failed to create drawable
[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
freecad: ../../src/xcb_io.c:259: poll_for_event: La declaración `!xcb_xlib_threads_sequence_lost' no se cumple.
Abortado (`core' generado)

Same problem on Kubuntu 18.10

Same problem on Ubuntu 18.10 with both the repo 0.16.6712+dfsg1-3build1 version and the current Appimage 0.17 version.

OS: Ubuntu 18.10 x86_64
Kernel: 4.20.0-042000-generic
Packages: 2151 (dpkg), 26 (flatpak), 32 (snap)
Shell: bash 4.4.19
Resolution: 1680x1050, 1920x1200
DE: GNOME 3.30.1
WM: GNOME Shell
WM Theme: Adwaita
Theme: Adwaita-dark [GTK2/3]
Icons: Yaru [GTK2/3]
Terminal: gnome-terminal
CPU: AMD Ryzen Threadripper 1900X 8- (16) @ 3.800GHz
GPU: AMD ATI Radeon RX Vega 64
Memory: 4184MiB / 15958MiB

$ freecad
FreeCAD 0.16, Libs: 0.16R
© Juergen Riegel, Werner Mayer, Yorik van Havre 2001-2015
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  # ## #### #### # # # # #
  #### # # # # # # # ##### # #
  # # #### #### # # # # #
  # # # # # # # # # ## ## ##
  # # #### #### ### # # #### ## ## ##

failed to create drawable
[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
freecad: ../../src/xcb_io.c:263: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
Aborted (core dumped)

$ ./FreeCAD-0.17.13541.9948ee4.glibc2.17-x86_64.AppImage
FreeCAD 0.17, Libs: 0.17R13541 (Git)
© Juergen Riegel, Werner Mayer, Yorik van Havre 2001-2018
  ##### #### ### ####
  # # # # # #
  # ## #### #### # # # # #
  #### # # # # # # # ##### # #
  # # #### #### # # # # #
  # # # # # # # # # ## ## ##
  # # #### #### ### # # #### ## ## ##

failed to create drawable
[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
freecad: ../../src/xcb_io.c:263: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
Aborted (core dumped)

I am using the freecad 0.18-pre appimage on elementary juno (ubuntu 18.04) and this worked for me:

edit the .desktop file:

.local/share/applications/appimagekit_2886566de966dc3a1acbab1d9f01752f-freecad-daily.desktop

and change the Exec line to be

Exec=sh -c "LIBGL_DRI3_DISABLE=true /home/username/Applications/FreeCAD_0.18.15780.glibc2.17-x86_64.AppImage"

I have prepared a change to the Debian package that will eliminate this issue.

As noted in the Debian bug this may be a driver issue.
Freecad starts fine for me on Ubuntu 20.04 with nvidia drivers on a Geforce GTX 1060