BUG #13858: Server with debugger installed consumes 100% of one CPU core

The following bug has been logged on the website:

Bug reference:      13858
Logged by:          Sergey
Email address:      sergey-v@mail.ru
PostgreSQL version: 9.5.0
Operating system:   Windows 7 x64
Description:        

It happened few times today - after some period and I'm not sure which
particular my actions, one of the postgres.exe process starts eating 100% of
one CPU core.

I've found only way to fix that - kill that process, because normal control
functions do not work (i.e. stopping server from pgAdmin).

Last time i've capture the call stack of the thread consuming the CPU (via
https://technet.microsoft.com/en-us/sysinternals/processexplorer):

	ntoskrnl.exe!memset+0x61a
	ntoskrnl.exe!KeWaitForMultipleObjects+0xd52
	ntoskrnl.exe!KeWaitForMutexObject+0x19f
	ntoskrnl.exe!_misaligned_access+0xba4
	ntoskrnl.exe!_misaligned_access+0x1821
	ntoskrnl.exe!KiCheckForKernelApcDelivery+0x25
	ntoskrnl.exe!MmProbeAndLockPages+0xbc6
	afd.sys+0x460f3
	afd.sys+0x45963
	ntoskrnl.exe!NtMapViewOfSection+0x15b7
	ntoskrnl.exe!NtDeviceIoControlFile+0x56
	ntoskrnl.exe!KeSynchronizeExecution+0x3a23
	ntdll.dll!ZwDeviceIoControlFile+0xa
	mswsock.dll+0x174d
	WS2_32.dll!WSARecv+0x169
	postgres.exe!pgwin32_recv+0x79
	plugin_debugger.dll!BreakpointFreeSession+0x3f1
	plugin_debugger.dll!pg_finfo_pldbg_set_global_breakpoint+0xd6e
	plpgsql.dll!exec_get_datum_type_info+0xd65
	plpgsql.dll!exec_get_datum_type_info+0xcff
	plpgsql.dll!exec_get_datum_type_info+0x142a
	plpgsql.dll!exec_get_datum_type_info+0xe14
	plpgsql.dll!exec_get_datum_type_info+0xcff
	plpgsql.dll!exec_get_datum_type_info+0x142a
	plpgsql.dll!exec_get_datum_type_info+0xe14
	plpgsql.dll!exec_get_datum_type_info+0xbbb
	plpgsql.dll!plpgsql_exec_function+0x2e6
	plpgsql.dll!plpgsql_call_handler+0x11f
	postgres.exe!ExecProject+0x1ea8
	postgres.exe!ExecProject+0x1f60
	postgres.exe!ExecProject+0x47fa
	postgres.exe!ExecProject+0x166
	postgres.exe!ExecResult+0xb4
	postgres.exe!ExecProcNode+0x82
	postgres.exe!EvalPlanQualEnd+0x8cd
	postgres.exe!standard_ExecutorRun+0xa8
	postgres.exe!PortalRunFetch+0x64b
	postgres.exe!PortalRun+0x1c7
	postgres.exe!get_stats_option_name+0x2a19
	postgres.exe!PostgresMain+0x703
	postgres.exe!ShmemBackendArrayAllocation+0x2a6a
	postgres.exe!SubPostmasterMain+0x273
	postgres.exe!main+0x480
	postgres.exe!pgwin32_popen+0x130b
	kernel32.dll!BaseThreadInitThunk+0xd
	ntdll.dll!RtlUserThreadStart+0x21