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Re: 11RC5: any EGL app (X11) crashes on exit with SIGSEGV - dlopen/atexit strikes again

Hello!

I was able to fix SIGSEGV in libEGL with this patch:
--- usr/src/external/mit/xorg/lib/libEGL/Makefile.orig 2026-07-05 06:29:08.032120003 +0000 +++ usr/src/external/mit/xorg/lib/libEGL/Makefile 2026-07-05 06:31:34.364661709 +0000 
@@ -92,7 +92,8 @@
 		-DHAVE_TIMESPEC_GET \
 		-DHAVE_PTHREAD \
 		-DHAVE_LIBDRM \
-		-DHAVE_MINCORE
+		-DHAVE_MINCORE \
+		-DHAVE_NOATEXIT

 .include "../libloader.mk"


Tested with following commands

cd /usr/src/
time ./build.sh -O ~/obj -T ~/tools -j 1C -x -U distribution

fastfetch # crashes with SIGSEGV
LD_LIBRARY_PATH=$HOME/obj/destdir.amd64/usr/X11R7/lib fastfetch # works
This resolution fully matches my expectation (that source file eglglobals.c. is correct but macro HAVE_NOATEXIT is not defined at build time). 

Best regards
  --Henryk Paluch


On 7/4/26 10:06 PM, Henryk Paluch wrote:

Hello!
Had found that specific X11 applications (fastfetch from latest pkgsrc) crashes on exit with SIGSEGV. It is same class of problem as reported earlier with Mesa applications - see https://gnats.netbsd.org/cgi-bin/ query-pr-single.pl?number=60025 but this time it is in different place. 

How to reproduce:
* have NetBSD 11.0_RC5 installed with X11
* run application that uses libEGL - tested "fastfetch" from pkgsrc
* it will SIGSEGV on exit - because of atexit(3) call inside libEGL.so library loaded via dlopen(3) - which is not supported on NetBSD. 


Details in GDB session:
gdb /usr/pkg/bin/fastfetch.

+break main
Breakpoint 1 at 0x2bf57: file /home/ansible/pkgsrc/sysutils/fastfetch/ work/fastfetch-2.64.2/src/fastfetch.c, line 831. 
+run
Starting program: /usr/pkg/bin/fastfetch
Breakpoint 1, main (argc=1, argv=0x7f7fff6f39f8) at /home/ansible/ pkgsrc/sysutils/fastfetch/work/fastfetch-2.64.2/src/fastfetch.c:831 
831    int main(int argc, char** argv) {
+break dlopen
Breakpoint 2 at 0x7adb3ee1b2f0: dlopen. (2 locations)
+c
Continuing.
Breakpoint 2.2, dlopen (name=name@entry=0x7f7fff6f2b70 "nss_compat.so.0", mode=mode@entry=513) at /usr/src/libexec/ld.elf_so/ rtld.c:1090 
1090    {
+break atexit
Breakpoint 3 at 0x7adb3ef1164b: file /usr/src/lib/libc/stdlib/atexit.c, line 265. 
+c
Continuing.
Breakpoint 2.2, dlopen (name=name@entry=0x7f7fff6f2b70 "nss_nis.so.0", mode=mode@entry=513) at /usr/src/libexec/ld.elf_so/rtld.c:1090 
1090    {
+c
Continuing.
Breakpoint 2.2, dlopen (name=name@entry=0x7f7fff6f2b70 "nss_files.so.0", mode=mode@entry=513) at /usr/src/libexec/ld.elf_so/rtld.c:1090 
1090    {
+c
Continuing.
Breakpoint 2.2, dlopen (name=name@entry=0x7f7fff6f2b70 "nss_dns.so.0", mode=mode@entry=513) at /usr/src/libexec/ld.elf_so/rtld.c:1090 
1090    {
+c
Continuing.
Breakpoint 3, atexit (func=0xe76dda <ffDestroyInstance>) at /usr/src/ lib/libc/stdlib/atexit.c:265 265        return (__cxa_atexit_internal((void (*)(void *))func, NULL, NULL)); 
+bt
#0  atexit (func=0xe76dda <ffDestroyInstance>) at /usr/src/lib/libc/ stdlib/atexit.c:265 #1  0x0000000000e6df7b in main (argc=1, argv=0x7f7fff6f39f8) at /home/ ansible/pkgsrc/sysutils/fastfetch/work/fastfetch-2.64.2/src/fastfetch.c:833 
+c
Continuing.
Breakpoint 2.2, dlopen (name=0x11b02d5 "libxcb-randr.so", mode=1) at / usr/src/libexec/ld.elf_so/rtld.c:1090 
1090    {
+c
Continuing.
Breakpoint 2.2, dlopen (name=0x11b0f6b "libXrandr.so", mode=1) at /usr/ src/libexec/ld.elf_so/rtld.c:1090 
1090    {
+c
Continuing.
Breakpoint 2.2, dlopen (name=0x11af6b4 "libdrm.so", mode=1) at /usr/src/ libexec/ld.elf_so/rtld.c:1090 
1090    {
+c
Continuing.
Breakpoint 2.2, dlopen (name=0x114afd1 "libEGL.so", mode=1) at /usr/src/ libexec/ld.elf_so/rtld.c:1090 
1090    {
+c
Continuing.
Breakpoint 3, atexit (func=func@entry=0x7adb3ea9be60 <_eglAtExit>) at / usr/src/lib/libc/stdlib/atexit.c:265 265        return (__cxa_atexit_internal((void (*)(void *))func, NULL, NULL)); 

+bt
#0  atexit (func=func@entry=0x7adb3ea9be60 <_eglAtExit>) at /usr/src/ lib/libc/stdlib/atexit.c:265 #1  0x00007adb3ea9bf33 in _eglAddAtExitCall (func=func@entry=0x7adb3eaa9f7c <_eglFiniTSD>) at /usr/xsrc/external/ mit/MesaLib/dist/src/egl/main/eglglobals.c:142 #2  0x00007adb3eaaa05a in _eglInitTSD () at /usr/xsrc/external/mit/ MesaLib/dist/src/egl/main/eglcurrent.c:94 #3  _eglCheckedGetTSD () at /usr/xsrc/external/mit/MesaLib/dist/src/egl/ main/eglcurrent.c:151 #4  _eglGetCurrentThread () at /usr/xsrc/external/mit/MesaLib/dist/src/ egl/main/eglcurrent.c:170 #5  0x00007adb3ea9d7cb in _eglSetFuncName (object=0x0, objectType=12344, disp=0x0, funcName=0x7adb3eab0f70 <__func__.42> "eglGetProcAddress") at /usr/xsrc/external/mit/MesaLib/dist/src/egl/main/eglapi.c:270 #6  eglGetProcAddress (procname=0x114af30 "glGetString") at /usr/xsrc/ external/mit/MesaLib/dist/src/egl/main/eglapi.c:2732 #7  0x0000000000e93ff1 in eglHandleData (result=0x7f7fff6f3130, data=0x7f7fff6f3030) at /home/ansible/pkgsrc/sysutils/fastfetch/work/ fastfetch-2.64.2/src/detection/opengl/opengl_shared.c:137 #8  0x0000000000e943f8 in ffOpenGLDetectByEGL (result=0x7f7fff6f3130) at /home/ansible/pkgsrc/sysutils/fastfetch/work/fastfetch-2.64.2/src/ detection/opengl/opengl_shared.c:206 #9  0x0000000001069c9b in ffDetectOpenGL (options=0x7f7fff6f3180, result=0x7f7fff6f3130) at /home/ansible/pkgsrc/sysutils/fastfetch/work/ fastfetch-2.64.2/src/detection/opengl/opengl_linux.c:183 #10 0x0000000000e9151c in detectByOpenGL (gpus=0x7f7fff6f3290) at /home/ ansible/pkgsrc/sysutils/fastfetch/work/fastfetch-2.64.2/src/detection/ gpu/gpu.c:92 #11 0x0000000000e919cd in ffDetectGPU (options=0x7f7fff6f35e0, result=0x7f7fff6f3290) at /home/ansible/pkgsrc/sysutils/fastfetch/work/ fastfetch-2.64.2/src/detection/gpu/gpu.c:197 #12 0x0000000000f12119 in ffPrintGPU (options=0x7f7fff6f35e0) at /home/ ansible/pkgsrc/sysutils/fastfetch/work/fastfetch-2.64.2/src/modules/gpu/ gpu.c:169 #13 0x0000000000e71a80 in parseStructureCommand (data=0x7f7fff6f3950, line=0x7adb3ed4527d "GPU", fn=0xe70be3 <genJsonResult>) at /home/ ansible/pkgsrc/sysutils/fastfetch/work/fastfetch-2.64.2/src/common/impl/ commandoption.c:183 #14 0x0000000000e72969 in ffPrintCommandOption (data=0x7f7fff6f3950) at /home/ansible/pkgsrc/sysutils/fastfetch/work/fastfetch-2.64.2/src/ common/impl/commandoption.c:218 #15 0x0000000000e6d5c1 in run (data=0x7f7fff6f3950) at /home/ansible/ pkgsrc/sysutils/fastfetch/work/fastfetch-2.64.2/src/fastfetch.c:764 #16 0x0000000000e6e08b in main (argc=1, argv=0x7f7fff6f39f8) at /home/ ansible/pkgsrc/sysutils/fastfetch/work/fastfetch-2.64.2/src/fastfetch.c:854 

+frame 1
#1  0x00007adb3ea9bf33 in _eglAddAtExitCall (func=func@entry=0x7adb3eaa9f7c <_eglFiniTSD>) at /usr/xsrc/external/ mit/MesaLib/dist/src/egl/main/eglglobals.c:142 
142             atexit(_eglAtExit);

+l
137
138    #if defined(HAVE_NOATEXIT)
139          registered = EGL_TRUE;
140    #else
141          if (!registered) {
142             atexit(_eglAtExit);
143             registered = EGL_TRUE;
144          }
145    #endif
146
To me it looks like error that macro HAVE_NOATEXIT is not actually defined (but should be) - so atexit(3) is called accidentally. 

References:
* https://cvsweb.netbsd.org/bsdweb.cgi/xsrc/external/mit/MesaLib/dist/ src/egl/main/eglglobals.c.diff?r1=1.7;r2=1.8;f=h 
* https://marc.info/?t=176604443000001&r=1&w=2
* https://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=60025

Best regards
   --Henryk Paluch
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