Crash using debug target and regcaches

[Andrew Cagney]

> Seen in a recent CVS checkout, and today's.  Just "set debug target 1" and
> run a threaded application:
> 
> #11524 0x0810c8f8 in read_register_gen (regnum=8,
>     buf=0xbfffe70c "\020Ï,\bÓ¤#\bÔ\f%\bP^\n\blð\021\bÿÿÿÿ") at ../../src/gdb/regcache.c:760
> #11525 0x080d585d in debug_print_register (func=0x823a4f1 "target_fetch_registers", regno=8)
>     at ../../src/gdb/target.c:1736
> #11526 0x080d5982 in debug_to_fetch_registers (regno=8) at ../../src/gdb/target.c:1756
> #11527 0x0810c434 in regcache_raw_read (regcache=0x82cfd08, regnum=8, buf=0xbfffe7ec)
>     at ../../src/gdb/regcache.c:694
> #11528 0x0810c991 in regcache_cooked_read (regcache=0x82cfd08, regnum=8, buf=0xbfffe7ec)
>     at ../../src/gdb/regcache.c:769
> #11529 0x0810c8f8 in read_register_gen (regnum=8,
>     buf=0xbfffe7ec "\020Ï,\bÓ¤#\bÔ\f%\bP^\n\blð\021\bÿÿÿÿ") at ../../src/gdb/regcache.c:760
> #11530 0x080d585d in debug_print_register (func=0x823a4f1 "target_fetch_registers", regno=8)
>     at ../../src/gdb/target.c:1736
> #11531 0x080d5982 in debug_to_fetch_registers (regno=8) at ../../src/gdb/target.c:1756
> #11532 0x0810c434 in regcache_raw_read (regcache=0x82cfd08, regnum=8, buf=0xbfffe8cc)
>     at ../../src/gdb/regcache.c:694
> #11533 0x0810c991 in regcache_cooked_read (regcache=0x82cfd08, regnum=8, buf=0xbfffe8cc)
>     at ../../src/gdb/regcache.c:769
> #11534 0x0810c8f8 in read_register_gen (regnum=8, buf=0xbfffe8cc "\020Ï,\b\b")
>     at ../../src/gdb/regcache.c:760
> #11535 0x0810d908 in read_register (regnum=8) at ../../src/gdb/regcache.c:1150
> #11536 0x0810d988 in read_register_pid (regnum=8, ptid={pid = 21520, lwp = 21520, tid = 0})
>     at ../../src/gdb/regcache.c:1162
> #11537 0x0810ddcd in generic_target_read_pc (ptid={pid = 21520, lwp = 21520, tid = 0})
>     at ../../src/gdb/regcache.c:1320

Is this still ``at''?

Andrew