[Bug breakpoints/26019] FreeRTOS task breakpoint causes core dump

["jeff at jkent dot net" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26019

--- Comment #4 from Jeff Kent <jeff at jkent dot net> ---
I was able to repro this bug with the following gdb session.  I'm using 8.3.0
because I accidentally wiped out my toolchain with GDB 9.1.  Woops.  It's
currently rebuilding.

GNU gdb (GNU Tools for Arm Embedded Processors 9-2019-q4-major)
8.3.0.20190709-git
Copyright (C) 2019 Free Software Foundation, Inc.
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(gdb) file examples/freertos-demo/build/freertos-demo.elf
Reading symbols from examples/freertos-demo/build/freertos-demo.elf...
(gdb) target remote localhost:2331
Remote debugging using localhost:2331
_vect_irq () at ../../baremetal/entry.S:41
41              ldr pc, [pc, #24]
(gdb) monitor halt
(gdb) monitor reset
Resetting target
(gdb) load
Loading section .entry, size 0xa4 lma 0x0
Loading section .entry_thumb, size 0x24 lma 0xa4
Loading section .text, size 0x3aa8 lma 0xc8
Loading section .rodata, size 0x58 lma 0x3b70
Loading section .data, size 0x10 lma 0x3bc8
Start address 0x0, load size 15320
Transfer rate: 56 KB/sec, 3064 bytes/write.
(gdb) monitor reset
Resetting target
(gdb) break examples/freertos-demo/main.c:61
Breakpoint 1 at 0x3b64: file main.c, line 61.
(gdb) continue
Continuing.

Breakpoint 1, task_b (
/mnt/workspace/workspace/GCC-9-pipeline/jenkins-GCC-9-pipeline-100_20191030_1572397542/src/gdb/gdb/frame.c:558:
internal-error: frame_id get_frame_id(frame_info*): Assertion `stashed' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) y

This is a bug, please report it.  For instructions, see:
<http://www.gnu.org/software/gdb/bugs/>.

/mnt/workspace/workspace/GCC-9-pipeline/jenkins-GCC-9-pipeline-100_20191030_1572397542/src/gdb/gdb/frame.c:558:
internal-error: frame_id get_frame_id(frame_info*): Assertion `stashed' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) y
Aborted (core dumped)

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