GDB examination of core file
hbarta@rocinante:~$ ls -l core
-rw------- 1 hbarta hbarta 104566784 Sep  5 11:18 core
hbarta@rocinante:~$ file core
core: ELF 64-bit LSB core file, x86-64, version 1 (SYSV), SVR4-style, from
'/usr/bin/Xwayland :0 -rootless -terminate -accessx -core -listen 4 -listen
5 -d', real uid: 1000, effective uid: 1000, real gid: 1000, effective gid:
1000, execfn: '/usr/bin/Xwayland', platform: 'x86_64'
hbarta@rocinante:~$ gdb /usr/bin/Xwayland  core
GNU gdb (Debian 8.1-4) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/bin/Xwayland...Reading symbols from
/usr/lib/debug/.build-id/b0/5eff2ea3c555f3a53cada3613925b052be1363.debug...done.
done.
[New LWP 5433]
[New LWP 5440]
[New LWP 5437]
[New LWP 5442]
[New LWP 5443]
[New LWP 5439]
[New LWP 5438]
[New LWP 5434]
[New LWP 5444]
[New LWP 5441]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/bin/Xwayland :0 -rootless -terminate -accessx
-core -listen 4 -listen 5 -d'.
Program terminated with signal SIGABRT, Aborted.
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
51 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
[Current thread is 1 (Thread 0x7f7ac5b4f640 (LWP 5433))]
(gdb) bt
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007f7ac72622f1 in __GI_abort () at abort.c:79
#2  0x000055680fc7a30a in OsAbort () at ../../../../os/utils.c:1350
#3  0x000055680fc7fe13 in AbortServer () at ../../../../os/log.c:877
#4  0x000055680fc80c79 in FatalError (f=f@entry=0x55680fca3fb0 "Caught
signal %d (%s). Server aborting\n") at ../../../../os/log.c:1015
#5  0x000055680fc77721 in OsSigHandler (signo=11, sip=<optimized out>,
unused=<optimized out>) at ../../../../os/osinit.c:156
#6  <signal handler called>
#7  0x00007f7abf517fe0 in st_renderbuffer_delete (ctx=0x55681106d610,
rb=0x5568114f55f0) at ../../../src/mesa/state_tracker/st_cb_fbo.c:239
#8  0x00007f7abf47eb11 in _mesa_reference_renderbuffer_
(ptr=ptr@entry=0x556811563748,
rb=rb@entry=0x0) at ../../../src/mesa/main/renderbuffer.c:212
#9  0x00007f7abf40dc5a in _mesa_reference_renderbuffer (rb=0x0,
ptr=0x556811563748) at ../../../src/mesa/main/renderbuffer.h:72
#10 _mesa_free_framebuffer_data (fb=fb@entry=0x556811563600) at
../../../src/mesa/main/framebuffer.c:223
#11 0x00007f7abf40dc8e in _mesa_destroy_framebuffer (fb=0x556811563600) at
../../../src/mesa/main/framebuffer.c:199
#12 0x00007f7abf40dd39 in _mesa_reference_framebuffer_
(ptr=ptr@entry=0x556811b94bd0,
fb=fb@entry=0x0) at ../../../src/mesa/main/framebuffer.c:256
#13 0x00007f7abf37a752 in _mesa_reference_framebuffer (fb=0x0,
ptr=0x556811b94bd0) at ../../../src/mesa/main/framebuffer.h:63
#14 _mesa_free_context_data (ctx=ctx@entry=0x556811b94ac0) at
../../../src/mesa/main/context.c:1320
#15 0x00007f7abf524d8d in st_destroy_context (st=0x556811ba9c40) at
../../../src/mesa/state_tracker/st_context.c:659
#16 0x00007f7abf6ec999 in dri_destroy_context () at
../../../../../src/gallium/state_trackers/dri/dri_context.c:239
#17 0x00007f7abf6eb923 in driDestroyContext (pcp=0x5568116282a0) at
../../../../../../src/mesa/drivers/dri/common/dri_util.c:532
#18 0x000055680fb9d229 in __glXDRIcontextDestroy
(baseContext=0x5568115ba790) at ../../../../glx/glxdriswrast.c:132
#19 0x000055680fb9bf7b in __glXFreeContext (cx=0x5568115ba790) at
../../../../glx/glxext.c:190
#20 ContextGone (cx=0x5568115ba790, id=<optimized out>) at
../../../../glx/glxext.c:82
#21 0x000055680fc662ad in doFreeResource (res=0x556811ce5ba0,
skip=skip@entry=0) at ../../../../dix/resource.c:880
#22 0x000055680fc66f66 in FreeResourceByType (id=<optimized out>,
type=<optimized out>, skipFree=skipFree@entry=0) at
../../../../dix/resource.c:941
#23 0x000055680fba1229 in __glXDisp_DestroyContext (cl=<optimized out>,
pc=0x55681150f520 "\227\004\002") at ../../../../glx/glxcmds.c:437
#24 0x000055680fc85d45 in dispatch_DestroyContext (client=0x556811532000)
at ../../../../glx/vnd_dispatch_stubs.c:82
#25 0x000055680fc4199e in Dispatch () at ../../../../dix/dispatch.c:478
#26 0x000055680fc45946 in dix_main (argc=12, argv=0x7ffccb324498,
envp=<optimized out>) at ../../../../dix/main.c:276
#27 0x00007f7ac724db17 in __libc_start_main (main=0x55680fb17150 <main>,
argc=12, argv=0x7ffccb324498, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>,
    stack_end=0x7ffccb324488) at ../csu/libc-start.c:310
#28 0x000055680fb1718a in _start () at ../../../../glx/glxcmds.c:125
(gdb)

I will provide the core file if helpful.

-- 
'03 BMW F650CS - hers
'98 Dakar K12RS - "BABY K" grew up.
'93 R100R w/ Velorex 700 (MBD starts...)
'95 Miata - "OUR LC"
polish visor: apply squashed bugs, rinse, repeat
Beautiful Sunny Winfield, Illinois

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