Re: [PATCH, committed]: Zone collector

[Daniel Berlin <dberlin at dberlin dot org>]

On Oct 27, 2003, at 2:03 AM, Andreas Jaeger wrote:

> I tried to bootstrapp on x86_64-linux-gnu using --with-gc=zone and
> full checking (including GCAC) and get this ICE:
>
> ./xgcc -B./ -B/opt/gcc/3.4-devel/x86_64-suse-linux-gnu/bin/ -isystem 
> /opt/gcc/3.4-devel/x86_64-suse-linux-gnu/include -isystem 
> /opt/gcc/3.4-devel/x86_64-suse-linux-gnu/sys-include 
> -L/abuild/aj/builds/gcc/misc/gcc/../ld -O2 -DIN_GCC    -W -Wall 
> -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -isystem 
> ./include  -I. -I. -I/usr/src/aj/cvs/gcc/gcc 
> -I/usr/src/aj/cvs/gcc/gcc/. -I/usr/src/aj/cvs/gcc/gcc/../include   -g0 
> -finhibit-size-directive -fno-inline-functions -fno-exceptions 
> -fno-zero-initialized-in-bss -fno-unit-at-a-time 
> -fno-omit-frame-pointer -fno-asynchronous-unwind-tables \
>    -c /usr/src/aj/cvs/gcc/gcc/crtstuff.c -DCRT_END \
>   -o crtend.o
> In file included from /usr/src/aj/cvs/gcc/gcc/tsystem.h:89,
>                  from /usr/src/aj/cvs/gcc/gcc/crtstuff.c:62:
> /usr/include/stdlib.h:394: internal compiler error: in sweep_pages, at 
> ggc-zone.c:1333
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <URL:http://gcc.gnu.org/bugs.html> for instructions.
> make: *** [crtend.o] Error 1
>
> Running gdb gives some more insight:
>
> (gdb) r -fpreprocessed crtstuff.i -quiet -dumpbase crtstuff.c 
> -mtune=k8 -auxbase-strip crtend.o -g0 -O2 -W -Wall -Wwrite-strings 
> -Wstrict-prototypes -Wmissing-prototypes -version 
> -finhibit-size-directive -fno-inline-functions -fno-exceptions 
> -fno-zero-initialized-in-bss -fno-unit-at-a-time 
> -fno-omit-frame-pointer -fno-asynchronous-unwind-tables -o crtstuff.s
> Starting program: /abuild/aj/builds/gcc/misc/gcc/cc1 -fpreprocessed 
> crtstuff.i -quiet -dumpbase crtstuff.c -mtune=k8 -auxbase-strip 
> crtend.o -g0 -O2 -W -Wall -Wwrite-strings -Wstrict-prototypes 
> -Wmissing-prototypes -version -finhibit-size-directive 
> -fno-inline-functions -fno-exceptions -fno-zero-initialized-in-bss 
> -fno-unit-at-a-time -fno-omit-frame-pointer 
> -fno-asynchronous-unwind-tables -o crtstuff.s
> Breakpoint 2 at 0x2a9569fc30
> Breakpoint 3 at 0x2a9569ed00
> GNU C version 3.4 20031027 (experimental) (x86_64-suse-linux-gnu)
>         compiled by GNU C version 3.3.1 (SuSE Linux).
> GGC heuristics: --param ggc-min-expand=0 --param ggc-min-heapsize=0
>
> Breakpoint 1, fancy_abort (file=0xf98440 
> "/usr/src/aj/cvs/gcc/gcc/ggc-zone.c", line=1333, function=0xf984c1 
> "sweep_pages")
>     at /usr/src/aj/cvs/gcc/gcc/diagnostic.c:584
> 584       internal_error ("in %s, at %s:%d", function, trim_filename 
> (file), line);
> (gdb) bt
> #0  fancy_abort (file=0xf98440 "/usr/src/aj/cvs/gcc/gcc/ggc-zone.c", 
> line=1333, function=0xf984c1 "sweep_pages")
>     at /usr/src/aj/cvs/gcc/gcc/diagnostic.c:584
> #1  0x0000000000c8bfd8 in sweep_pages (zone=0x11895a0) at 
> /usr/src/aj/cvs/gcc/gcc/ggc-zone.c:1333
> #2  0x0000000000c8c2a0 in ggc_collect_1 (zone=0x11895a0, 
> need_marking=true) at /usr/src/aj/cvs/gcc/gcc/ggc-zone.c:1401
> #3  0x0000000000c8c3f9 in ggc_collect () at 
> /usr/src/aj/cvs/gcc/gcc/ggc-zone.c:1472
> #4  0x00000000004029f6 in yyparse () at c-parse.y:295
> #5  0x000000000040d94c in c_parse_file () at c-parse.y:2834
> #6  0x000000000047f827 in c_common_parse_file (set_yydebug=0) at 
> /usr/src/aj/cvs/gcc/gcc/c-opts.c:1226
> #7  0x0000000000c3599a in compile_file () at 
> /usr/src/aj/cvs/gcc/gcc/toplev.c:1836
> #8  0x0000000000c3abb7 in do_compile () at 
> /usr/src/aj/cvs/gcc/gcc/toplev.c:4689
> #9  0x0000000000c3ac4f in toplev_main (argc=26, argv=0x7fbfffeec8) at 
> /usr/src/aj/cvs/gcc/gcc/toplev.c:4729
> #10 0x00000000004a76cb in main (argc=26, argv=0x7fbfffeec8) at 
> /usr/src/aj/cvs/gcc/gcc/main.c:35
> (gdb) up
> #1  0x0000000000c8bfd8 in sweep_pages (zone=0x11895a0) at 
> /usr/src/aj/cvs/gcc/gcc/ggc-zone.c:1333
> 1333                    abort ();
> (gdb) p p
> $1 = (page_entry *) 0x123c130
> (gdb) p *p
> $2 = {next = 0x123c0f0, bytes = 4096, survived = 2, page = 
> 0x2a95a2e000 "", bytes_free = 6990, context_depth = 0, large_p = 
> false,
^^^^^^^^^^^^^^^^^^^
This shouldn't happen (we can't have 6990 bytes free in a page of 4096).

There are only a couple causes of it, and it's usually pretty easy to 
track down, if i can get this bug to reproduce on a non-x86-64 machine.

>   zone = 0x11895a0}


I'll redo gcac checking on the mainline on my x86 (I haven't redone it 
since posting the patch).
>