Xorg crash after first connect.

[Kamil Choromański]

Issue seen on DELL Inspiron 5559, Ubuntu 16.04.2 x64 with latest updates installed, X.Org X Server 1.18.4.

OS info: Linux-4.8.0-52-generic-x86_64-with-Ubuntu-16.04-xenial
CPU info: Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz Cache: 4096 KB Cores: 2

Steps:
1. Install Ubuntu 16.04 x64.
2. Connect UDL (DL195) device with monitor attached to machine.

Issue:
Machine freeze for ~30sec and then logon screen will appear.
Xorg crashed.

Expected:
No Xorg crash.

Reproducibility:
100%
To reproduced using shorter path deleted ~/.config/monitors.xml

Notes:
- Issue also seen on Ubuntu 16.10x64;
- Issue also seen on Dell XPS 9360 (i7-7500u), Lenovo Yoga 2 pro (i7-4500u), Samsung Series 9 (i7-3517u);
- Issue is not reproducible on Ubuntu 17.04 x64;

(gdb) bt
#0 0x00007fa0de94d428 in __GI_raise (sig=sig@entry=6)
    at ../sysdeps/unix/sysv/linux/raise.c:54
#1 0x00007fa0de94f02a in __GI_abort () at abort.c:89
#2 0x00007fa0de945bd7 in __assert_fail_base (fmt=<optimized out>,
    assertion=assertion@entry=0x7fa0da44c325 "fbo->tex != 0",
    file=file@entry=0x7fa0da44c30b "../../glamor/glamor_fbo.c",
    line=line@entry=189,
    function=function@entry=0x7fa0da44c460 <__PRETTY_FUNCTION__.45021> "glamor_pixmap_ensure_fb") at assert.c:92
#3 0x00007fa0de945c82 in __GI___assert_fail (
    assertion=assertion@entry=0x7fa0da44c325 "fbo->tex != 0",
    file=file@entry=0x7fa0da44c30b "../../glamor/glamor_fbo.c",
    line=line@entry=189,
    function=function@entry=0x7fa0da44c460 <__PRETTY_FUNCTION__.45021> "glamor_pixmap_ensure_fb") at assert.c:101
#4 0x00007fa0da442b25 in glamor_pixmap_ensure_fb (
    glamor_priv=glamor_priv@entry=0x55cc675d3280, fbo=fbo@entry=0x55cc683e2b20)
    at ../../glamor/glamor_fbo.c:189
#5 0x00007fa0da442de2 in glamor_create_fbo_from_tex (
    glamor_priv=glamor_priv@entry=0x55cc675d3280, w=100, h=100, format=6408,
    tex=tex@entry=0, flag=flag@entry=0) at ../../glamor/glamor_fbo.c:250
#6 0x00007fa0da426ddf in glamor_set_pixmap_texture (
    pixmap=pixmap@entry=0x55cc6879a1c0, tex=0) at ../../glamor/glamor.c:106
#7 0x00007fa0da4253ae in glamor_egl_create_textured_pixmap_from_gbm_bo (
    pixmap=pixmap@entry=0x55cc6879a1c0, bo=bo@entry=0x55cc68183140)
    at ../../../../glamor/glamor_egl.c:361
#8 0x00007fa0da42561e in glamor_back_pixmap_from_fd (
    pixmap=pixmap@entry=0x55cc6879a1c0, fd=fd@entry=34, width=width@entry=100,
    height=height@entry=100, stride=stride@entry=512,
    depth=depth@entry=24 '\030', bpp=32 ' ')
    at ../../../../glamor/glamor_egl.c:558
#9 0x00007fa0da4256c6 in glamor_pixmap_from_fd (screen=0x55cc6745c870, fd=34,
    width=<optimized out>, height=<optimized out>, stride=<optimized out>,
    depth=24 '\030', bpp=32 ' ') at ../../../../glamor/glamor_egl.c:578
#10 0x000055cc6696e871 in dri3_pixmap_from_fd (
    ppixmap=ppixmap@entry=0x7ffd4d8e07f0, screen=<optimized out>,
    fd=fd@entry=34, width=<optimized out>, height=<optimized out>,
    stride=<optimized out>, depth=24 '\030', bpp=32 ' ')
    at ../../dri3/dri3_screen.c:73
#11 0x000055cc6696e461 in proc_dri3_pixmap_from_buffer (client=0x55cc683e67f0)
    at ../../dri3/dri3_request.c:162
#12 0x000055cc6683ad5f in Dispatch () at ../../dix/dispatch.c:430
#13 0x000055cc6683edd3 in dix_main (argc=11, argv=0x7ffd4d8e09d8,
    envp=<optimized out>) at ../../dix/main.c:300
#14 0x00007fa0de938830 in __libc_start_main (main=0x55cc66829010 <main>,
    argc=11, argv=0x7ffd4d8e09d8, init=<optimized out>, fini=<optimized out>,
    rtld_fini=<optimized out>, stack_end=0x7ffd4d8e09c8)
    at ../csu/libc-start.c:291
#15 0x000055cc66829049 in _start ()

[Timo Aaltonen (tjaalton)]

16.04 is EOL