Delayed presentation of keyboard interrupts in SBCL under WSL

[Paul F. Dietz]

When I load a certain compiled file with sufficiently complicated :load-toplevel forms, keyboard interrupts (C-c) no longer work. However, if a different error is stimulated, the interrupt condition is signaled instead.

In the following, r10.lsp is the file containing

(eval-when (:load-toplevel)
  (loop repeat 100 do (eval '(make-list 100000))))

This is under Ubuntu running under WSL on Windows 10, with Virtual Machine Platform enabled.

--------------------------------

This is SBCL 1.5.8.27-b8ee8710a, an implementation of ANSI Common Lisp.
More information about SBCL is available at <http://www.sbcl.org/>.

SBCL is free software, provided as is, with absolutely no warranty.
It is mostly in the public domain; some portions are provided under
BSD-style licenses. See the CREDITS and COPYING files in the
distribution for more information.
* (load (compile-file "r10.lsp"))
; compiling file "/home/dietz/ansi-test/r10.lsp" (written 30 OCT 2019 07:41:25 PM):
; compiling (LOOP REPEAT ...)

; wrote /home/dietz/ansi-test/r10.fasl
; compilation finished in 0:00:00.002
T
* ^C^C
()
NIL
* (foo)
; in: FOO
; (FOO)
;
; caught STYLE-WARNING:
; undefined function: COMMON-LISP-USER::FOO
;
; compilation unit finished
; Undefined function:
; FOO
; caught 1 STYLE-WARNING condition

debugger invoked on a SB-SYS:INTERACTIVE-INTERRUPT in thread
#<THREAD "main thread" RUNNING {10005104C3}>:
  Interactive interrupt at #x7F9290BDF1F6.

Type HELP for debugger help, or (SB-EXT:EXIT) to exit from SBCL.

restarts (invokable by number or by possibly-abbreviated name):
  0: [CONTINUE] Return from SB-UNIX:SIGINT.
  1: [ABORT ] Exit debugger, returning to top level.

("bogus stack frame")
0]