[Bug gdb/19394] New: crash in get_frame_type() while stepping (s)

["gerhard.gappmeier at ascolab dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19394

            Bug ID: 19394
           Summary: crash in get_frame_type() while stepping (s)
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: gerhard.gappmeier at ascolab dot com
  Target Milestone: ---

Overview:

This problem is somehow related to having a custom pretty printer installed.
When debugging an application and using the step command to step into a
specific function it crashes.
I don't see anything from the pretty printer in the callstack, but without the
pretty printer it does not happen.

How to reproduce:
1.) start gdb: gdb ./server1
2.) set breakpoint on problematic function call
3.) run
3.) step -> core dumped

This happens with various GDB versions:
* GNU gdb (Gentoo 7.9.1 vanilla) 7.9.1
* Latest git version built from source
(6d265cb4a956310d2cae231ac63a37e11fe376e1)

I attached to coredump created with the latest Git build (-O1 -ggdb)

The frame info in get_frame_type is invalid for any reason:
(gdb) print *frame
$1 = {
  level = 0,
  pspace = 0x0,
  aspace = 0x650000006c,
  prologue_cache = 0x5400000072,
  unwind = 0x7000000079,
...
(gdb) print *frame->unwind
Cannot access memory at address 0x7000000079

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