Re: frame_register_unwind(): "frame != NULL" assertion failure

[Kevin Buettner <kevinb at redhat dot com>]

On Feb 13,  4:29pm, Daniel Jacobowitz wrote:
> Subject: Re: frame_register_unwind(): "frame != NULL" assertion failure
> On Thu, Feb 13, 2003 at 02:23:50PM -0700, Kevin Buettner wrote:
> > Andrew,
> > 
> > Any ideas about what to do about this assertion failure?  This is
> > occurring in a mips-linux native gdb built using current sources. 
> > (Okay, they're a few hours old by now...) I was debugging gdb with
> > itself and was running to a breakpoint placed on main().
> > 
> > #0  internal_error (
> >     file=0x7a1a60 "/home/devel/kevinb/sourceware-mips64/src.baseline/gdb/frame.c", line=187, string=0x7a1aa0 "%s%sAssertion `%s' failed.")
> >     at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/utils.c:800
> > #1  0x00577c94 in frame_register_unwind (frame=0x0, regnum=187, 
> >     optimizedp=0x7a1b20, lvalp=0x7fff68d4, addrp=0x7fff68d8, 
> >     realnump=0x7fff68e0, bufferp=0x7fff68c0)
> >     at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/frame.c:187
> > #2  0x004f8534 in read_next_frame_reg (fi=0x7fff68c0, regno=29)
> >     at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/mips-tdep.c:1592
> 
> That backtrace must be inaccurate?  read_next_frame_reg just passes fi
> to frame_register_unwind...

I'll try to get a better one.  gdb was compiled with -O2 and I see:

outer-gdb> down
#2  0x004f8534 in read_next_frame_reg (fi=0x7fff68c0, regno=29)
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/mips-tdep.c:1592
1592      frame_register_unwind (fi, regno, &optimized, &lval, &addr, &realnum,
outer-gdb> info address fi
Symbol "fi" is an argument in register s1.

I'll recompile without -O2 and post a new backtrace...

Kevin