On Sun, Aug 18, 2024 at 11:58:33AM +0100, Stuart Henderson wrote: > On 2024/08/18 09:09, Walter Alejandro Iglesias wrote: > > I still don't understand how gdb(1) works. Today I ran the same command > > against the same Xorg.core file but I got different messages. The whole > > egdb output: > > > > $ egdb -q $(which X) Xorg.core > > Reading symbols from /usr/X11R6/bin/X... > [...] > > warning: .dynamic section for "/usr/lib/libc.so.100.3" is not at the > > expected address (wrong library or version mismatch?) > > You presumably rebooted between generating the core and trying to use > gdb and triggered the "library_aslr" mechanism, so the libc.so that you > now have is useless for debugging with that core. >
Oh, I see, because the "reordering libraries"! Then those messages I got were not related to the bug. The bad news is now I compiled xenocara with debug symbols and egdb still shows nothing (this time I didn't reboot): $ egdb $(which X) Xorg.core Reading symbols from /usr/X11R6/bin/X... BFD: warning: /home/morlock/Xorg.core is truncated: expected core file size >= 22428072, found: 1710504 [New process 138511] [New process 289405] [New process 532913] [New process 443937] Cannot access memory at address 0x255deaa5048 Cannot access memory at address 0x255deaa5040 Core was generated by `Xorg'. Program terminated with signal SIGABRT, Aborted. #0 0x000002564bc0643b in ?? () [Current thread is 1 (process 138511)] (gdb) bt #0 0x000002564bc0643b in ?? () Backtrace stopped: Cannot access memory at address 0x7739cdf761e0 (gdb) thread 2 [Switching to thread 2 (process 289405)] #0 0x000002564bc10f7b in ?? () (gdb) bt #0 0x000002564bc10f7b in ?? () Backtrace stopped: Cannot access memory at address 0x2569976dcc0 (gdb) thread 3 [Switching to thread 3 (process 532913)] #0 0x000002564bc10f7b in ?? () (gdb) bt #0 0x000002564bc10f7b in ?? () Backtrace stopped: Cannot access memory at address 0x25679aae6a0 (gdb) thread 4 [Switching to thread 4 (process 443937)] #0 0x000002564bc10f7b in ?? () (gdb) bt #0 0x000002564bc10f7b in ?? () Backtrace stopped: Cannot access memory at address 0x256444dbe10 (gdb) -- Walter
