[Bug backtrace/9786] New: "info frame: generates an error when remote debugging

[Bug backtrace/9786] New: "info frame: generates an error when remote debugging

[nickrob at snap dot net dot nz]

This report is actually for GDB in CVS (6.8.50.20090123-cvs) but that's not
one of the listed options.

In one terminal:
gdbserver localhost:4444 myprog

In another:
gdb myprog
...
(gdb) target remote localhost:4444
Remote debugging using localhost:4444
0xb7fda810 in ?? () from /lib/ld-linux.so.2
(gdb) info frame
Stack level 0, frame at 0x0:
 eip = 0xb7fda810; saved eip 
findvar.c:299: internal-error: value_of_register_lazy: Assertion `frame_id_p
(get_frame_id (frame))' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n)

Previously (GNU gdb 6.6-debian):

(gdb) target remote localhost:4444
Remote debugging using localhost:4444
0xb7f3f810 in ?? () from /lib/ld-linux.so.2
(gdb) inf frame
Stack level 0, frame at 0x0:
 eip = 0xb7f3f810; saved eip 0xb7f3f810
 Outermost frame: unwinder did not report frame ID
 Arglist at unknown address.
 Locals at unknown address, Previous frame's sp in esp

The saved eip was reported as the same as the actual eip.  I'm not sure
if that's right but in any case "info frame" shouldn't throw an error but
report "unknown address" if that's the case.

-- 
           Summary: "info frame: generates an error when remote debugging
           Product: gdb
           Version: 6.8
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: backtrace
        AssignedTo: unassigned at sourceware dot org
        ReportedBy: nickrob at snap dot net dot nz
                CC: gdb-prs at sourceware dot org
 GCC build triplet: i486-linux-gnu
  GCC host triplet: i486-linux-gnu
GCC target triplet: i486-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=9786

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[Bug backtrace/9786] "info frame: generates an error when remote debugging

[brobecker at gnat dot com]

------- Additional Comments From brobecker at gnat dot com  2009-09-03 22:58 -------
The following patch, sent as an RFC, fixes this issue:

http://www.sourceware.org/ml/gdb-patches/2009-08/msg00524.html

-- 


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[Bug backtrace/9786] "info frame: generates an error when remote debugging

[nickrob at snap dot net dot nz]

------- Additional Comments From nickrob at snap dot net dot nz  2009-09-04 23:34 -------
Subject:  "info frame: generates an error when remote debugging

 > The following patch, sent as an RFC, fixes this issue:
 > 
 > http://www.sourceware.org/ml/gdb-patches/2009-08/msg00524.html

I can't comment on the broader implication of this patch but I can confirm
that it does, indeed, fix the bug that I reported.

Thanks,
Nick


-- 


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[Bug backtrace/9786] "info frame: generates an error when remote debugging

[brobecker at gnat dot com]

------- Additional Comments From brobecker at gnat dot com  2009-09-10 02:30 -------
To reproduce the problem without gdbserver, try the following on x86-linux:

(gdb) b _start
Breakpoint 1 at 0x80482a0
(gdb) run
Starting program: /lot.a/brobecke/info-frame/ex/foo 

Breakpoint 1, 0x080482a0 in _start ()
(gdb) info frame
Stack level 0, frame at 0x0:
 eip = 0x80482a0 in _start; saved eip 
/homes/brobecke/act/gdb-public/gdb/findvar.c:304: internal-error: value_of_regis
ter_lazy: Assertion `frame_id_p (get_frame_id (frame))' failed.


-- 


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[Bug backtrace/9786] "info frame: generates an error when remote debugging

[tromey at redhat dot com]

------- Additional Comments From tromey at redhat dot com  2009-10-13 16:47 -------
This patch went in, so I'm guessing this bug should be closed... ?

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at redhat dot com
             Status|UNCONFIRMED                 |WAITING


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[Bug backtrace/9786] "info frame: generates an error when remote debugging

[nickrob at snap dot net dot nz]

------- Additional Comments From nickrob at snap dot net dot nz  2009-10-14 00:44 -------
> This patch went in, so I'm guessing this bug should be closed... ?

Yes.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |FIXED


http://sourceware.org/bugzilla/show_bug.cgi?id=9786

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