First, thanks for a quick response.<div><span style="font: var(--bigRobotoFont); -webkit-tap-highlight-color: transparent; -webkit-text-size-adjust: 100%;"><br></span></div><div><span style="font: var(--bigRobotoFont); -webkit-tap-highlight-color: transparent; -webkit-text-size-adjust: 100%;">Second, is a reassignment to some Mesa package required?</span><div><div><br><div>Third, is there anything else I can do as a user to help the developers to bugfix this? Bug at line 1017 is strange: if there is a NULL dereference there, there should also probably be one in line 1016 unless someone has a deterministic concurrent access to that data.</div><div><br></div><div>Fourth, I apologize for long delays.I don’t always have the laptop at my direct disposal.</div></div></div></div>
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31.01.2020, 02:09, Bernhard Übelacker <<a href="mailto:bernhardu@mailbox.org">bernhardu@mailbox.org</a>>
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Hello Md Ayquassar,<br/>
sorry, I did not recognize that you<br/>
seem to have a usrmerge'd system.<br/>
<br/>
Then I get following backtraces from your<br/>
core dump, with and without debug symbols.<br/>
<br/>
It looks like a function pointer gets called<br/>
unconditionally, while containing NULL.<br/>
Seems to be graphics driver related.<br/>
<br/>
Kind regards,<br/>
Bernhard<br/>
<br/>
<br/>
<br/>
<a href="https://sources.debian.org/src/mesa/18.3.6-2/src/egl/drivers/dri2/egl_dri2.c/#L1017" target="_blank" title="https://sources.debian.org/src/mesa/18.3.6-2/src/egl/drivers/dri2/egl_dri2.c/#L1017">https://sources.debian.org/src/mesa/18.3.6-2/src/egl/drivers/dri2/egl_dri2.c/#L1017</a><br/>
<br/>
<br/>
<br/>
(gdb) bt<br/>
#0 0x00000000 in ?? ()<br/>
#1 0xaf7d2c74 in ?? () from /lib/i386-linux-gnu/libEGL_mesa.so.0<br/>
#2 0xaf7d755e in ?? () from /lib/i386-linux-gnu/libEGL_mesa.so.0<br/>
#3 0xade2d004 in ?? () from /usr/lib/i386-linux-gnu/dri/radeon_dri.so<br/>
#4 0xade2d812 in ?? () from /usr/lib/i386-linux-gnu/dri/radeon_dri.so<br/>
#5 0xade9232f in ?? () from /usr/lib/i386-linux-gnu/dri/radeon_dri.so<br/>
#6 0xaf7d29ba in ?? () from /lib/i386-linux-gnu/libEGL_mesa.so.0<br/>
#7 0xaf7c061c in eglMakeCurrent () from /lib/i386-linux-gnu/libEGL_mesa.so.0<br/>
#8 0xb4cd8b58 in ?? () from /lib/i386-linux-gnu/libEGL.so.1<br/>
#9 0xb674a1bd in _cogl_winsys_egl_make_current () from /usr/lib/i386-linux-gnu/mutter/libmutter-cogl-3.so<br/>
#10 0xb6d8f1f6 in ?? () from /lib/i386-linux-gnu/libmutter-3.so.0<br/>
#11 0xb6ceaca4 in meta_renderer_rebuild_views () from /lib/i386-linux-gnu/libmutter-3.so.0<br/>
#12 0xb6d920fa in meta_stage_native_rebuild_views () from /lib/i386-linux-gnu/libmutter-3.so.0<br/>
#13 0xb6d83ba7 in ?? () from /lib/i386-linux-gnu/libmutter-3.so.0<br/>
#14 0xb6ccf11a in ?? () from /lib/i386-linux-gnu/libmutter-3.so.0<br/>
#15 0xb6ccff40 in ?? () from /lib/i386-linux-gnu/libmutter-3.so.0<br/>
#16 0xb6d83f98 in ?? () from /lib/i386-linux-gnu/libmutter-3.so.0<br/>
#17 0xb6cd053a in meta_clutter_init () from /lib/i386-linux-gnu/libmutter-3.so.0<br/>
#18 0xb6d20323 in meta_init () from /lib/i386-linux-gnu/libmutter-3.so.0<br/>
#19 0x004ad53d in ?? ()<br/>
#20 0xb6aa2b41 in __libc_start_main (main=0x4ad430, argc=1, argv=0xbff2c2a4, init=0x4adfa0, fini=0x4ae000, rtld_fini=0xb7f97520 <_dl_fini>, stack_end=0xbff2c29c) at ../csu/libc-start.c:308<br/>
#21 0x004ad8d1 in ?? ()<br/>
(gdb) <br/>
<br/>
<br/>
<br/>
<br/>
Core was generated by `/usr/bin/gnome-shell'.<br/>
Program terminated with signal SIGSEGV, Segmentation fault.<br/>
#0 0x00000000 in ?? ()<br/>
[Current thread is 1 (Thread 0xb1f2eb80 (LWP 899))]<br/>
(gdb) set width 0<br/>
(gdb) set pagination off<br/>
(gdb) bt<br/>
#0 0x00000000 in ?? ()<br/>
#1 0xaf7d2c74 in dri2_egl_surface_alloc_local_buffer (dri2_surf=0x1b8e9f0, att=9, format=32) at ../src/egl/drivers/dri2/egl_dri2.c:1017<br/>
#2 0xaf7d755e in dri2_drm_get_buffers_with_format (driDrawable=0x1b73580, width=0x1b73598, height=0x1b7359c, attachments=0xbff2bb04, count=2, out_count=0xbff2baf8, loaderPrivate=0x1b8e9f0) at ../src/egl/drivers/dri2/platform_drm.c:344<br/>
#3 0xade2d004 in radeon_update_renderbuffers (context=0x19e7d60, drawable=0x1b73580, front_only=0 '\000') at ../src/mesa/drivers/dri/radeon/radeon_common_context.c:421<br/>
#4 0xade2d812 in radeonMakeCurrent (driContextPriv=0x19e7d60, driDrawPriv=0x1b73580, driReadPriv=0x1b73580) at ../src/mesa/drivers/dri/radeon/radeon_common_context.c:616<br/>
#5 0xade9232f in driBindContext (pcp=0x19e7d60, pdp=0x1b73580, prp=0x1b73580) at ../src/mesa/drivers/dri/common/dri_util.c:579<br/>
#6 0xaf7d29ba in dri2_make_current (drv=0x19e5120, disp=0x19e49c0, dsurf=0x1b8e9f0, rsurf=0x1b8e9f0, ctx=<optimized out>) at ../src/egl/drivers/dri2/egl_dri2.c:1516<br/>
#7 0xaf7c061c in eglMakeCurrent (dpy=0x19e49c0, draw=0x1b8e9f0, read=0x1b8e9f0, ctx=0x19fe5c0) at ../src/egl/main/eglapi.c:860<br/>
#8 0xb4cd8b58 in InternalMakeCurrentVendor (dpy=0x19e3dd0, draw=<a target="_blank" title="draw@entry">draw@entry</a>=0x1b8e9f0, read=0x1b8e9f0, <a target="_blank" title="read@entry">read@entry</a>=0x19c3310, context=0x19fe5c0, apiState=0x19fe360, vendor=<optimized out>) at ../../../src/EGL/libegl.c:861<br/>
#9 0xb4cd9606 in eglMakeCurrent (dpy=<optimized out>, draw=<optimized out>, read=0x1b8e9f0, context=0x19fe5c0) at ../../../src/EGL/libegl.c:727<br/>
#10 0xb674a1bd in _cogl_winsys_egl_make_current (display=0x19ca4d8, draw=0x1b8e9f0, read=0x1b8e9f0, context=0x19fe5c0) at winsys/cogl-winsys-egl.c:300<br/>
#11 0xb6d8f1f6 in meta_renderer_native_create_view (renderer=0x19c8610, logical_monitor=0x19bbf20) at backends/native/meta-renderer-native.c:2949<br/>
#12 0xb6ceaca4 in meta_renderer_create_view (logical_monitor=<optimized out>, renderer=0x19c8610) at ./backends/meta-renderer.h:36<br/>
#13 meta_renderer_rebuild_views (renderer=0x19c8610) at backends/meta-renderer.c:73<br/>
#14 0xb6d920fa in meta_stage_native_rebuild_views (stage_native=0x19c2470) at backends/native/meta-stage-native.c:141<br/>
#15 0xb6d83ba7 in meta_backend_native_update_screen_size (backend=0x19a48b8, width=1024, height=768) at backends/native/meta-backend-native.c:493<br/>
#16 0xb6ccf11a in meta_backend_sync_screen_size (backend=<a target="_blank" title="backend@entry">backend@entry</a>=0x19a48b8) at backends/meta-backend-private.h:52<br/>
#17 0xb6ccff40 in meta_backend_real_post_init (backend=0x19a48b8) at backends/meta-backend.c:442<br/>
#18 0xb6d83f98 in meta_backend_native_post_init (backend=0x19a48b8) at ./backends/meta-backend-private.h:52<br/>
#19 0xb6cd053a in meta_backend_post_init (backend=<optimized out>) at backends/meta-backend-private.h:52<br/>
#20 meta_clutter_init () at backends/meta-backend.c:1239<br/>
#21 0xb6d20323 in meta_init () at core/main.c:598<br/>
#22 0x004ad53d in main (argc=<optimized out>, argv=<optimized out>) at ../src/main.c:465<br/>
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