For quite some time (at least since gdb 7.0), I've been unable to print char *
variables in gdb on Solaris 2/x86:

$ ./gdb ./gdb
GNU gdb (GDB) 7.1.50.20100416-cvs
[...]
(top-gdb) b main
Breakpoint 3 at 0x80dd33f: file /vol/gnu/src/binutils/src/gdb/gdb.c, line 28.
(top-gdb) run
(top-gdb) p argv
$1 = (char **) 0x8047904
(top-gdb) p argv[0] 
$2 = 0x8047a0c <error reading variable>
(top-gdb) printf "%s\n", $2
/vol/gnu/obj/src/gdb/gdb
(top-gdb) printf "%s\n", argv[0]
/vol/gnu/obj/src/gdb/gdb

This is extremely annoying and makes gdb next to unusable.