internal-error: insert_step_resume_breakpoint_at_sal

[Andrew Cagney]

Nick Roberts wrote:
>  > > Well symtab = 0x0 looks unassigned to me.
>  > 
>  > More likely not-found, what's at that address?
> 
> Whats at 0x0?! Are you winding me up, or is it some kind of offset?

What's at $pc (where PC is 0x4012e7e9 or 0x80850d5), symtab==0 indicates 
a symtab lookup failure.

>  > Can you capture the output from "set debug infrun 1"?  It should help.
> 
> See below. I can send the full transcript if necessary.

How much more?

> Nick
> 
> ...
> infrun: TARGET_WAITKIND_STOPPED
> infrun: stop_pc = 0x4012e7e9
> infrun: random signal 20
> infrun: resume (step=0, signal=20)
> infrun: prepare_to_wait
> infrun: infwait_normal_state
> infrun: TARGET_WAITKIND_STOPPED
> infrun: stop_pc = 0x4012e7e9
> infrun: random signal 20
> infrun: resume (step=0, signal=20)
> 
> infrun: prepare_to_wait
> Breakpoint 3, Fsplit_window (window=137726961, size=137726961, 
>     horflag=137726961) at window.c:3688
> 3688      if (NILP (window))
> (gdb) n

There appears to be stuff missing here, the output should contain 
something like:

	resume(step=1, signal=0)
	resume(step=0, signal=0)

as GDB single-steps the thread off breakpoint 3.  The PC should be near 
or at 0x80850d5 found in the below.

> infrun: infwait_normal_state
> infrun: TARGET_WAITKIND_STOPPED
> infrun: stop_pc = 0x4012e7e9
> infrun: random signal 20
> infrun: resume (step=0, signal=20)
> infrun: prepare_to_wait
> infrun: infwait_normal_state
> infrun: TARGET_WAITKIND_STOPPED
> infrun: stop_pc = 0x4012e7e9
> infrun: random signal 20
> infrun: resume (step=0, signal=20)
> infrun: prepare_to_wait
> infrun: infwait_normal_state
> infrun: TARGET_WAITKIND_STOPPED
> infrun: stop_pc = 0x80850d5
> infrun: BPSTATE_WHAT_STOP_NOISY
> infrun: stop_stepping
> 
> Breakpoint 1, internal_error (file=0x82214d7 "infrun.c", line=2671, 
>     string=0x81ef681 "%s: Assertion `%s' failed.") at utils.c:789
> 789       va_start (ap, string);
> 

Andrew