Re: [Bug: 21.5-b26+CVS] Crash in GC

Here's the C backtrace: (gdb) bt #0 0x00000033ac92fbe7 in ?? () from /lib64/libc.so.6 #1 0x00000000004c2f65 in fatal_error_signal (sig=6) at /home/james/Projects/xemacs/xemacs-21.5/src/emacs.c:3792 #2 <signal handler called> #3 0x00000033ac92fbe7 in ?? () from /lib64/libc.so.6 #4 0x00000000004c2f80 in fatal_error_signal (sig=11) at /home/james/Projects/xemacs/xemacs-21.5/src/emacs.c:3790 #5 <signal handler called> #6 lispdesc_indirect_count_1 (code=-2, idesc=Variable "idesc" is not available.) at /home/james/Projects/xemacs/xemacs-21.5/src/gc.c:373 #7 0x000000000056320c in kkcc_marking (cnt=100000) at /home/james/Projects/xemacs/xemacs-21.5/src/lrecord.h:1917 #8 0x00000000005632dc in gc_resume_mark (incremental=Variable "incremental" is not available. ) at /home/james/Projects/xemacs/xemacs-21.5/src/gc.c:1878 #9 0x00000000005635e0 in gc_1 (incremental=1) at /home/james/Projects/xemacs/xemacs-21.5/src/gc.c:1913 #10 0x00000000005636b0 in gc (incremental=1) at /home/james/Projects/xemacs/xemacs-21.5/src/gc.c:1945 #11 0x00000000004d0365 in Ffuncall (nargs=2, args=0x7fffffd0cf00) at /home/james/Projects/xemacs/xemacs-21.5/src/eval.c:3822 #12 0x00000000004d0f87 in call1 (fn=Variable "fn" is not available. ) at /home/james/Projects/xemacs/xemacs-21.5/src/eval.c:4545 #13 0x00000000004e1db0 in execute_internal_event (event=84134392) at /home/james/Projects/xemacs/xemacs-21.5/src/event-stream.c:3102 #14 0x00000000004e8ff2 in Fdispatch_event (event=84134392) at /home/james/Projects/xemacs/xemacs-21.5/src/event-stream.c:4644 #15 0x00000000004850d9 in Fcommand_loop_1 () at /home/james/Projects/xemacs/xemacs-21.5/src/cmdloop.c:600 #16 0x00000000004851ce in command_loop_1 (unused_dummy=Variable "unused_dummy" is not available. ) at /home/james/Projects/xemacs/xemacs-21.5/src/cmdloop.c:505 #17 0x00000000004cb7bf in condition_case_1 (handlers=Variable "handlers" is not available. ) at /home/james/Projects/xemacs/xemacs-21.5/src/eval.c:1924 #18 0x0000000000485305 in command_loop_2 (unused_dummy=Variable "unused_dummy" is not available. ) at /home/james/Projects/xemacs/xemacs-21.5/src/cmdloop.c:262 #19 0x00000000004c9db0 in internal_catch (tag=Variable "tag" is not available. ) at /home/james/Projects/xemacs/xemacs-21.5/src/eval.c:1530 #20 0x0000000000485544 in initial_command_loop (load_me=Variable "load_me" is not available. ) at /home/james/Projects/xemacs/xemacs-21.5/src/cmdloop.c:313 #21 0x00000000004c3e77 in xemacs_21_5_b26_x86_64_unknown_linux (argc=1, argv=0x7fffffd0d5d8, unused_envp=Variable "unused_envp" is not available. ) at /home/james/Projects/xemacs/xemacs-21.5/src/emacs.c:2666 #22 0x00000000004c4af7 in main (argc=Variable "argc" is not available. ) at /home/james/Projects/xemacs/xemacs-21.5/src/emacs.c:3110 Contrary to the print statement above, the crash is not due to address 0x8019c. It is due to address 0x10008019c (the value of irdata), which is 32 bytes past 0x10008017c (the value of the idata parameter in frame 6). This is because the print statement in vdb-posix.c that prints the addresses prints them as integers. On my platform, integers are 32 bits and addresses are 64 bits, so the print statement chops off the upper 32 bits. Note that the idata parameter in frame 6 is already bad: that address is not accessible in GDB. GDB and GCC don't seem to like each other very much on this platform (Fedora Core 5 for x86_64); note all the "is not available" messages in that backtrace. I can't visit anything meaningful in stack frame 7. I even compiled with -g3 this time, because I had the same thing happen to me when compiling with -g, but it does not seem to have helped at all. A quick test with -O0 -g3 shows that the problem persists even then. I'll save the core file in case someone can tell me what to do with it.