Ruslan Ermilov writes:
> Well, I tried this on beast. It is easily reproduceable.
>
> It turned out that if you build groff with -DNO_CPU_CFLAGS
> (the way it is built during the bootstrap-tools stage of
> buildworld), it fails with the `out of memory' error in
> contrib/groff/src/libs/libgroff/new.cc. To reproduce, it
> is only necessary to build the following dirs, in order,
> with -DNO_CPU_CFLAGS:
>
> gnu/usr.bin/groff/src/libs/libgroff
> gnu/usr.bin/groff/src/roff/groff
>
> And then run groff from the latter as follows:
>
> groff -V
>
> More fun. Groff is built with -fno-rtti and -fno-exceptions:
FWIW, the "out of memory" is because it is attempting to malloc
a huge amount of ram. Apparently mistakenly:
(gdb) break /usr/src/contrib/groff/src/libs/libgroff/new.cc:45
Breakpoint 1 at 0x12000c9cc: file
/usr/src/contrib/groff/src/libs/libgroff/new.cc, line 45.
(gdb) r
Starting program: /usr/src/gnu/usr.bin/groff/src/roff/groff/groff
Breakpoint 1, operator new(unsigned long) (size=4832141312)
at /usr/src/contrib/groff/src/libs/libgroff/new.cc:45
45 if (p == 0) {
(gdb) p/x size
$1 = 0x12004a000
(gdb)
Note that 0x12004a000 looks quite a bit like an address in the data
segment. The stack looks like this (its happening before main is entered):
(gdb) where
#0 operator new(unsigned long) (size=4832141312)
at /usr/src/contrib/groff/src/libs/libgroff/new.cc:45
#1 0x12000d528 in operator new[](unsigned long) ()
#2 0x12000c1ac in search_path (this=0x120035930, envvar=0x0,
standard=0x12002b8b1 "/usr/share/groff_font", add_home=1,add_current=0)
at /usr/src/contrib/groff/src/libs/libgroff/searchpath.cc:39
#3 0x12000aec4 in __static_initialization_and_destruction_0 ( __initialize_p=1,
__priority=65535) at /usr/src/contrib/groff/src/libs/libgroff/fontfile.cc:34
#4 0x12000af30 in _GLOBAL__I__ZN4font3resE () at
/usr/src/contrib/groff/src/libs/libgroff/fontfile.cc:34
#5 0x12002a0b8 in __do_global_ctors_aux ()
#6 0x120000150 in _init ()
#7 0x120000228 in _start ()
The code calling new is this bit of c++ code:
(gdb) frame 2
#2 0x12000c1ac in search_path (this=0x120035930, envvar=0x0,
standard=0x12002b8b1 "/usr/share/groff_font", add_home=1,
add_current=0)
at /usr/src/contrib/groff/src/libs/libgroff/searchpath.cc:39
39 dirs = new char[((e && *e) ? strlen(e) + 1 : 0)
(gdb) l
34 if (add_home)
35 home = getenv("HOME");
36 char *e = 0;
37 if (envvar)
38 e = getenv(envvar);
39 dirs = new char[((e && *e) ? strlen(e) + 1 : 0)
40 + (add_current ? 1 + 1 : 0)
41 + ((home && *home) ? strlen(home) + 1 : 0)
42 + ((standard && *standard) ? strlen(standard) : 0)
43 + 1];
I have no idea what 'e' is, gdb doesn't like things declared in the
middle of a scope, apparently.
Drew
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