Created attachment 120365 [details]
gdb dri3 remote

$ cat /etc/X11/xorg.conf.d/nouveau-dri3.conf
Section "Device"
    Identifier  "nvidia0"
    Driver      "nouveau"
    Option      "DRI" "3"
EndSection

$ grep DRI /var/log/Xorg.0.log
[    45.046] (**) NOUVEAU(0): Option "DRI" "3"
[    45.046] (**) NOUVEAU(0): Allowed maximum DRI level 3.
...
[    46.363] (II) NOUVEAU(0): DRI3 on EXA enabled
...

$ ssh -Y user@hostname

$ gdb glxinfo
...
Reading symbols from glxinfo...Reading symbols from /usr/lib/debug/usr/lib64/mesa/glxinfo.debug...done.
done.
(gdb) run
Starting program: /usr/bin/glxinfo 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
name of display: localhost:10.0
^C
Program received signal SIGINT, Interrupt.
0x00007ffff7531a40 in __poll_nocancel () at ../sysdeps/unix/syscall-template.S:84
84	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
(gdb) backtrace full
#0  0x00007ffff7531a40 in __poll_nocancel () at ../sysdeps/unix/syscall-template.S:84
No locals.
#1  0x00007ffff4f36272 in poll (__timeout=-1, __nfds=1, __fds=0x7fffffffdd60) at /usr/include/bits/poll2.h:46
No locals.
#2  _xcb_conn_wait (c=c@entry=0x555555762ea0, cond=cond@entry=0x7fffffffde80, vector=vector@entry=0x0, count=count@entry=0x0) at xcb_conn.c:459
        ret = <optimized out>
        fd = {fd = 3, events = 1, revents = 0}
#3  0x00007ffff4f37c27 in wait_for_reply (c=c@entry=0x555555762ea0, request=23, e=e@entry=0x0) at xcb_in.c:516
        cond = {__data = {__wseq = 0, __signals_sent = 0, __confirmed = 0, __generation = 0, __mutex = 0x0, __quiescence_waiters = 0, 
            __clockid = 0}, __size = '\000' <repeats 47 times>, __align = 0}
        reader = {request = 23, data = 0x7fffffffde80, next = 0x0}
        ret = 0x0
#4  0x00007ffff4f37d31 in xcb_wait_for_reply (c=0x555555762ea0, request=23, e=0x0) at xcb_in.c:546
        ret = <optimized out>
#5  0x00007ffff7b8d225 in loader_dri3_open () from /lib64/libGL.so.1
No symbol table info available.
#6  0x00007ffff7b88018 in dri3_create_screen () from /lib64/libGL.so.1
No symbol table info available.
#7  0x00007ffff7b5c911 in __glXInitialize () from /lib64/libGL.so.1
No symbol table info available.
#8  0x00007ffff7b58ccb in GetGLXPrivScreenConfig.part.2 () from /lib64/libGL.so.1
No symbol table info available.
#9  0x00007ffff7b58e2e in glXChooseVisual () from /lib64/libGL.so.1
No symbol table info available.
#10 0x0000555555556eb3 in mesa_hack (scrnum=0, dpy=0x555555760010) at glxinfo.c:1168
        visinfo = <optimized out>
        attribs = {4, 8, 1, 9, 1, 10, 1, 12, 1, 13, 1, 14, 1, 15, 1, 16, 1, 17, 1, 5, 0}
#11 main (argc=<optimized out>, argv=<optimized out>) at glxinfo.c:1257
        dpy = <optimized out>
        numScreens = 1
        scrnum = 0
        opts = {mode = Normal, findBest = 0 '\000', limits = 0 '\000', singleLine = 0 '\000', displayName = 0x0, allowDirect = 1 '\001'}
        coreWorked = <optimized out>
(gdb) q
A debugging session is active.

	Inferior 1 [process 4281] will be killed.

Quit anyway? (y or n) y

$ LIBGL_DEBUG=verbose LIBGL_DRI3_DISABLE=1 glxinfo
name of display: localhost:10.0
libGL error: failed to authenticate magic 1
libGL error: failed to load driver: nouveau
libGL: OpenDriver: trying /usr/lib64/dri/tls/swrast_dri.so
libGL: OpenDriver: trying /usr/lib64/dri/swrast_dri.so
libGL: Can't open configuration file /home/test/.drirc: No such file or directory.
libGL: Can't open configuration file /home/test/.drirc: No such file or directory.
display: localhost:10  screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
...
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
client glx extensions:
...
GLX version: 1.4
GLX extensions:
...
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: VMware, Inc. (0xffffffff)
    Device: llvmpipe (LLVM 3.7, 128 bits) (0xffffffff)
    Version: 11.2.0
    Accelerated: no
    Video memory: 1754MB
    Unified memory: no
    Preferred profile: compat (0x2)
    Max core profile version: 0.0
    Max compat profile version: 2.1
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 2.0
OpenGL vendor string: VMware, Inc.
OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.7, 128 bits)
OpenGL version string: 2.1 Mesa 11.2.0-devel (git-56aff6b)
OpenGL shading language version string: 1.30
OpenGL extensions:
...
OpenGL ES profile version string: OpenGL ES 2.0 Mesa 11.2.0-devel (git-56aff6b)
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 1.0.16
OpenGL ES profile extensions:
...