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

[Kevin Buettner <kevinb at redhat dot com>]

On Feb 13,  2:35pm, Kevin Buettner wrote:

> > That backtrace must be inaccurate?  read_next_frame_reg just passes fi
> > to frame_register_unwind...
> 
> I'll try to get a better one.  [...]

Okay, here's a better one.  This one shows that we're passing a NULL
frame starting from mips_init_extra_frame_info().

outer-gdb> bt
#0  internal_error (
    file=0x84abe0 "/home/devel/kevinb/sourceware-mips64/src.baseline/gdb/frame.c", line=187, string=0x84ac20 "%s%sAssertion `%s' failed.")
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/utils.c:800
#1  0x005e4ba4 in frame_register_unwind (frame=0x0, regnum=29, 
    optimizedp=0x7fff68d0, lvalp=0x7fff68e4, addrp=0x7fff68d8, 
    realnump=0x7fff68e0, bufferp=0x7fff68c0)
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/frame.c:187
#2  0x00536708 in read_next_frame_reg (fi=0x0, regno=29)
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/mips-tdep.c:1592
#3  0x00538c44 in heuristic_proc_desc (start_pc=715987376, limit_pc=715987376, 
    next_frame=0x0, cur_frame=1)
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/mips-tdep.c:2140
#4  0x0053a484 in find_proc_desc (pc=715987376, next_frame=0x0, cur_frame=1)
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/mips-tdep.c:2378
#5  0x0053ab58 in mips_init_extra_frame_info (fromleaf=0, fci=0x100573d0)
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/mips-tdep.c:2477
#6  0x00516d80 in gdbarch_init_extra_frame_info (gdbarch=0x10061798, 
    fromleaf=0, frame=0x100573d0)
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/gdbarch.c:4436
#7  0x005e88bc in get_prev_frame (next_frame=0x10057368)
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/frame.c:1321
#8  0x005e6298 in unwind_to_current_frame (ui_out=0x10059590, args=0x10057368)
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/frame.c:496
#9  0x005d423c in catcher (func=0x5e6258 <unwind_to_current_frame>, 
    func_uiout=0x10059590, func_args=0x10057368, func_val=0x7fff6c38, 
    func_caught=0x7fff6c3c, errstring=0x0, mask=2)
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/top.c:424
#10 0x005d43dc in catch_exceptions (uiout=0x10059590, 
    func=0x5e6258 <unwind_to_current_frame>, func_args=0x10057368, 
    errstring=0x0, mask=2)
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/top.c:474
#11 0x005e643c in get_current_frame ()
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/frame.c:518
#12 0x005e7c5c in reinit_frame_cache ()
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/frame.c:950
#13 0x0054d000 in solib_add (pattern=0x0, from_tty=0, target=0x0, readsyms=1)
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/solib.c:591
#14 0x004e68ec in handle_inferior_event (ecs=0x7fff6e58)
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/infrun.c:2078
#15 0x004e3388 in wait_for_inferior ()
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/infrun.c:1006
#16 0x004e2ec0 in proceed (addr=18446744073709551615, siggnal=TARGET_SIGNAL_0, 
    step=0)
    at /home/devel/kevinb/sourceware-mips64/src.baseline/gdb/infrun.c:804
...