OS: Windows 10
Fatal error when server sends ->~"[New Thread 2]\n"

Upgrading to newest version of Arm toolchain doesn't resolve the issue

    C:\Program Files (x86)\GNU Arm Embedded Toolchain\9 2020-q2-update\bin\arm-none-eabi-gdb.exe: warning: Couldn't determine a path for the index cache directory.
    GNU gdb (GNU Arm Embedded Toolchain 9-2020-q2-update) 8.3.1.20191211-git
    Copyright (C) 2019 Free Software Foundation, Inc.
    License GPLv3+: GNU GPL version 3 or later 
    <http://gnu.org/licenses/gpl.html>
    This is free software: you are free to change and redistribute it.
    There is NO WARRANTY, to the extent permitted by law.

Stack trace of the debug session included below
    1: (112559) 1106: elapsed time 2
    1: (112560) <-1107-var-create - * "ftp_err"
    1: (112569) ->1107^done,name="var30",numchild="0",value="<optimized out>",type="TcpServerStartStatus",thread-id="2",has_more="0"
    1: (112570) ->(gdb)
    1: (112570) 1107: elapsed time 9
    1: (112570) ->&"\n"
    1: (112570) ->^done
    1: (112570) ->(gdb)
    <--   C (variables-43): {"command":"variables","arguments":{"variablesReference":1000},"type":"request","seq":43}
    <--   C (stepIn-44): {"command":"stepIn","arguments":{"threadId":536886584},"type":"request","seq":44}
    1: (114754) <-1108-exec-step
    1: (114764) ->1108^running
    1: (114764) ->*running,thread-id="all"
    1: (114764) 1108: elapsed time 9
    1: (114765) ->(gdb)
    1: (114765) ->&"\n"
    1: (114770) ->^done
    1: (114770) ->(gdb)
    1: (114895) ->=thread-created,id="7",group-id="i1"
    1: (114895) <-1109-thread-info 7
    1: (114895) ->~"[New Thread 2]\n"
    1: (114896) ->&"/mnt/workspace/workspace/GCC-9-pipeline/jenkins-GCC-9-pipeline-200_20200521_1590053374/src/gdb/gdb/infrun.c:5335: internal-error: int finish_step_over(execution_control_state*): Assertion `ecs->event_thread->control.trap_expected' failed.\nA problem internal to GDB has been detected,\nfurther debugging may prove unreliable.\n"
    1: (114897) ->&"\nThis is a bug, please report it."
    1: (114897) ->&"  For instructions, see:\n<http://www.gnu.org/software/gdb/bugs/>."
    1: (114897) ->&"\n\n"
    [New Thread 2]
    1: (115046) "C:\Program Files (x86)\GNU Arm Embedded Toolchain\9 2020-q2-update\bin\arm-none-eabi-gdb.exe" exited with code 3 (0x3).
    1: (115054) <-logout
    1: (115055) <-logout
    1: (115062) Send Event AD7MessageEvent
ERROR: GDB exited unexpectedly with exit code 3 (0x3). Debugging will now abort.
    1: (115065) Send Event AD7ProgramDestroyEvent
The program 'C:\Users\mjmen\Documents\vscode\pvconnex\firmware\BUILD\DISCO_F746NG\GCC_ARM-DEBUG\firmware.elf' has exited with code -1 (0xffffffff).
    <--   C (disconnect-45): {"command":"disconnect","arguments":{"restart":false},"type":"request","seq":45}

Possible duplicates :

Bug 21497 - FreeBSD: infrun.c:5565: internal-error: int finish_step_over(execution_control_state*): Assertion `ecs->event_thread->control.trap_expected' failed
Bug 21774 - Ubuntu: infrun.c:5565: internal-error: int finish_step_over(execution_control_state*): Assertion `ecs->event_thread->control.trap_expected' failed
Bug 22063 - infrun.c:5570: internal-error: int finish_step_over(execution_control_state*): Assertion `ecs->event_thread->control.trap_expected' failed.
Bug 22925 - gdb assumes target can activate threads at will, causes internal error in infrun.c in 'finish_step_over'
Bug 24674 - GDB crash on remote target reconnect: Assertion `ecs->event_thread->control.trap_expected' failed.
Bug 26284 - [arm] infrun.c:5312: internal-error: int finish_step_over(execution_control_state*): Assertion `ecs->event_thread->control.trap_expected' failed