latest ecl git won't work with iolib example run-ex8-server (iomux).

Cannot use the iolib multiplexer.

> (ql:quickload :iolib.examples)

(:IOLIB.EXAMPLES)
> (iolib.examples:run-ex8-server)
Created socket: #<passive IPv4 stream socket, unbound 06870858>[fd=8]
Bound socket: #<passive IPv4 stream socket bound to 0.0.0.0/9999 06870858>
Listening on socket bound to: 0.0.0.0:9999
; Evaluation aborted on #<a EXT:SEGMENTATION-VIOLATION>.

the debugger:

Detected access to an invalid or protected memory address.
   [Condition of type EXT:SEGMENTATION-VIOLATION]

(lisp-implementation-version) "16.1.3"
(ext:lisp-implementation-vcs-id) "fb90d28ab5764059eea364b2d8108921b90a7572"
(software-type) "Linux"
(software-version) "4.9.52-v7+"
(machine-type) "armv7l"
*features* (:BORDEAUX-THREADS :21BIT-CHARS :THREAD-SUPPORT CFFI-FEATURES:FLAT-NAMESPACE
 CFFI-FEATURES:UNIX :CFFI CFFI-SYS::FLAT-NAMESPACE :ECL-WITH-BACKEND :ARM
 :SPLIT-SEQUENCE :SWANK :SERVE-EVENT :PROFILE :QUICKLISP :ASDF-PACKAGE-SYSTEM
 :ASDF3.1 :ASDF3 :ASDF2 :ASDF :OS-UNIX :NON-BASE-CHARS-EXIST-P :ASDF-UNICODE
 :WALKER :CDR-1 :CDR-5 :LINUX :FORMATTER :CDR-7 :ECL-WEAK-HASH :LITTLE-ENDIAN
 :ECL-READ-WRITE-LOCK :LONG-LONG :UINT64-T :UINT32-T :UINT16-T :LONG-FLOAT
 :UNICODE :DFFI :CLOS-STREAMS :CMU-FORMAT :UNIX :ECL-PDE :DLOPEN :CLOS :THREADS
 :BOEHM-GC :ANSI-CL :COMMON-LISP :IEEE-FLOATING-POINT :PACKAGE-LOCAL-NICKNAMES
 :CDR-14 :PREFIXED-API :FFI :ARMV7L :COMMON :ECL)