Comment 0 for bug 1493721

Xmir -sw (software) mode crashes the Mir server. If not immediately on startup then soon after running a few X clients...

(gdb) bt
#0 0x00007f8586f64cc0 in gbm_bo_get_user_data ()
   from /usr/lib/x86_64-linux-gnu/libgbm.so.1
#1 0x00007f85858212af in ?? ()
   from /usr/lib/x86_64-linux-gnu/mir/server-platform/graphics-mesa-kms.so.4
#2 0x00007f8585822099 in ?? ()
   from /usr/lib/x86_64-linux-gnu/mir/server-platform/graphics-mesa-kms.so.4
#3 0x00007f858ac980ac in ?? ()
   from /usr/lib/x86_64-linux-gnu/libmirserver.so.33
#4 0x00007f858aca1176 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libmirserver.so.33
#5 0x00007f858ad23431 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libmirserver.so.33
#6 0x00007f858a910ed0 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#7 0x00007f858821d6aa in start_thread (arg=0x7f8583bab700)
    at pthread_create.c:333
#8 0x00007f858a37deed in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109