Comment 2 for bug 1827946

* (run-crash-demo)
main thread: Starting main lisp on thread
main thread: Wait on sem #S(SB-THREAD:SEMAPHORE
                            :NAME NIL
                            :%COUNT 0
                            :WAITCOUNT 0
                            :MUTEX #<MUTEX "semaphore lock" (free)>
                            :QUEUE #<WAITQUEUE {10036D3F03}>).
foreign callback : in callback waiting on mutex
main thread: Doing a full GC.
fatal error encountered in SBCL pid 8504(tid 00000000010D18C0):
thread 00000000050D2000: bogus esp: 0000000000C5F2B0

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