[Bug remote/24674] New: GDB crash on remote target reconnect: Assertion `ecs->event_thread->control.trap_expected' failed.

[bjames at byu dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=24674

            Bug ID: 24674
           Summary: GDB crash on remote target reconnect: Assertion
                    `ecs->event_thread->control.trap_expected' failed.
           Product: gdb
           Version: 8.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: remote
          Assignee: unassigned at sourceware dot org
          Reporter: bjames at byu dot net
  Target Milestone: ---

Created attachment 11835
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11835&action=edit
Matrix multiply executable file used

OS: 
Ubuntu 16.04 4.15.0-48-generic

Error message: 
infrun.c:5284: internal-error: int finish_step_over(execution_control_state*):
Assertion `ecs->event_thread->control.trap_expected' failed.

GDB version: 8.3.50.20190605-git, built from source, compiled `--with-python`

This error occurs when debugging a Renode (https://renode.io/) simulation of a
RISC-V processor as a remote target.  Basic setup steps were followed per
instructions at https://github.com/renode/renode/blob/master/README.rst
(version 1.7.1.41134 of Renode).  Target is running a simple matrix multiply
benchmark, file included.


Steps to reproduce:
* start Renode simulation with `renode`
* In Renode terminal:
  - $name?="SiFive-FE310"
  - mach create $name
  - machine LoadPlatformDescription @platforms/cpus/sifive-fe310.repl
  - $bin=@[path_to_executable]
  - showAnalyzer sysbus.uart0
  - sysbus LoadELF $bin
  - sysbus Tag <0x10008000 4> "PRCI_HFROSCCFG" 0xFFFFFFFF
  - sysbus Tag <0x10008008 4> "PRCI_PLLCFG" 0xFFFFFFFF
  - sysbus.cpu PerformanceInMips 320
  - sysbus.cpu StartGdbServer 3333
* start gdb with [path_to_repo]/gdb/gdb
--data-directory=[path_to_repo]/gdb/data-directory [path_to_executable]
* in GDB interpreter:
  - b mm.c:24
  - target remote :3333
  - monitor start
  - continue     // verifying breakpoint
* simulate the remote target crashing by typing `quit` in Renode terminal
* try to `continue` in GDB - reports "Remote connection closed"
* restart Renode simulation according to instructions above
* try to reconnect GDB to remote with `target remote :3333`
* GDB crashes with the above error message


Incidental information:
This is not actually a bug with the Renode simulator - I am using GDB to flip
bits in memory and registers of the running program.  Sometimes this causes the
PC to jump to 0x00, or something out of the valid section, which crashes the
Renode simulation.  I would like to be able to restart the simulation and
reconnect GDB, since I am scripting GDB with the Python interface.

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