Saving a Core Image from a Compiled File Session: possible?

I've been unable to get CMUCL to save a core image from a compiled file.

After loading "myapp.x86f" -- I'm running CMU Common Lisp 19c on
debian 2.4.27-2-386, BTW -- into memory, executing (ext:save-lisp
"myapp.core") always results in a "Segmentation Violation".

But when I try (ext:save-lisp "myapp.core") after loading the source
file "myapp.lisp" -- instead of "myapp.x86f" -- I can always save the
core image successfuly.

So is saving core images not available for compiled files?

I've also tried explicitly setting :purify nil in the (ext:save-lisp)
call, but the result is the same.

Here's one such attempt and debugger backtrace:

* (ext:save-lisp "myapp.core")
[Doing purification:


Error in function UNIX::SIGSEGV-HANDLER:  Segmentation Violation at #x805292D.
   [Condition of type SIMPLE-ERROR]

Restarts:
  0: [ABORT] Return to Top-Level.

Debug  (type H for help)

(UNIX::SIGSEGV-HANDLER #<unused-arg>
                       #<unused-arg>
                       #.(SYSTEM:INT-SAP #x3FFFC950))
Source: Error finding source:
Error in function DEBUG::GET-FILE-TOP-LEVEL-FORM:  Source file no longer exists:
  target:code/signal.lisp.
0] backtrace

0: (UNIX::SIGSEGV-HANDLER #<unused-arg>
                          #<unused-arg>
                          #.(SYSTEM:INT-SAP #x3FFFC950))
1: (UNIX::SIGSEGV-HANDLER 3
                          #<unused-arg>
                          #<unused-arg>
                          #.(SYSTEM:INT-SAP #x3FFFC950))[:EXTERNAL]
2: ("call_into_lisp+#x8C [#x8054A5C] /usr/local/cmucl-19c/bin/lisp")
3: ("funcall3+#x29 [#x805486B] /usr/local/cmucl-19c/bin/lisp")
4: ("interrupt_handle_now+#xF0 [#x80504CF] /usr/local/cmucl-19c/bin/lisp")
5: ("NIL+#x805509C [#x805509C] /usr/local/cmucl-19c/bin/lisp")
6: ("NIL+#x80550D4 [#x80550D4] /usr/local/cmucl-19c/bin/lisp")
7: ("Foreign function call land")
8: ("NIL+#x8053926 [#x8053926] /usr/local/cmucl-19c/bin/lisp")
9: ("NIL+#x805339C [#x805339C] /usr/local/cmucl-19c/bin/lisp")
10: ("NIL+#x805390D [#x805390D] /usr/local/cmucl-19c/bin/lisp")
11: ("purify+#x194 [#x8053DF5] /usr/local/cmucl-19c/bin/lisp")
12: (LISP::%PURIFY 671088651 671088651)
13: ((FLET #:G5
       LISP::SUB-GC))
14: (LISP::SUB-GC :VERBOSE-P T :FORCE-P T ...)
15: (PURIFY :ROOT-STRUCTURES NIL :ENVIRONMENT-NAME "Auxiliary")
16: (SAVE-LISP "myapp.core" :PURIFY T :ROOT-STRUCTURES ...)
17: (INTERACTIVE-EVAL (SAVE-LISP "myapp.core"))
18: (LISP::%TOP-LEVEL)
19: ((LABELS LISP::RESTART-LISP
       SAVE-LISP))

0]