gdb/725: Crash using debug target and regcaches (in 5.3 branch?)

[ac131313 at redhat dot com]

>Number:         725
>Category:       gdb
>Synopsis:       Crash using debug target and regcaches (in 5.3 branch?)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Sep 26 17:18:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     ac131313@redhat.com
>Release:        2002-09-26
>Organization:
>Environment:
[I've a sinking feeling about 5.3]
>Description:
On Wed, Sep 18, 2002 at 08:59:47PM -0400, Andrew Cagney wrote:

> >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''?


Definitely.  You can't see it with /bin/ls (which is linked to the
thread library, and turns on lin-lwp, but only uses one thread).  I can
see it in a true multithreaded application; it only happens when
there's more than one thread.

-- Daniel Jacobowitz MontaVista Software Debian GNU/Linux Developer 
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: