Custom Query (1030 matches)

Our busy server (6 processes pulling and parsing XML feeds plus Hunchentoot serving web pages), got an infinite loop while interning a string.

We've seen this only once after a week of running this code 24/7, so it's likely hard to reproduce.

(lisp-implementation-version)
"Version 1.5-r13695M  (LinuxX8664)"

Relevant code:

(defun make-weak-hash-table (&rest rest)
  (declare (dynamic-extent rest))
  #-ccl                                                                         
  (apply #'make-hash-table rest)
  #+ccl
  (apply #'make-hash-table :weak :value rest))

(defvar *equal-object-hash*
  (make-weak-hash-table :test 'equal))

(defun equal-object-p (object)
  (or (stringp object)
      (and (numberp object) (not (fixnump object)))))

(defun intern-equal-object (object)
  (cond ((equal-object-p object)
         (or (gethash object *equal-object-hash*)
             (setf (gethash object *equal-object-hash*) object)))
        (t object)))

Error: Stack overflow: "CCL has entered the kernel debugger, due to an exception 11"

Backtrace:

(#x00007F7502647CA0) #x00003000000B2294 : #<Function LOCK-FREE-COUNT-ENTRIES #x00003000000B220F> + 133
(#x00007F7502647CE8) #x00003000000B2F9C : #<Function %LOCK-FREE-REHASH #x00003000000B2F0F> + 141
(#x00007F7502647D40) #x00003000000B29F4 : #<Function LOCK-FREE-REHASH #x00003000000B291F> + 213
(#x00007F7502647D80) #x00003000000B2294 : #<Function LOCK-FREE-COUNT-ENTRIES #x00003000000B220F> + 133
(#x00007F7502647DC8) #x00003000000B2F9C : #<Function %LOCK-FREE-REHASH #x00003000000B2F0F> + 141
(#x00007F7502647E20) #x00003000000B29F4 : #<Function LOCK-FREE-REHASH #x00003000000B291F> + 213
(#x00007F7502647E60) #x00003000000B2294 : #<Function LOCK-FREE-COUNT-ENTRIES #x00003000000B220F> + 133
(#x00007F7502647EA8) #x00003000000B2F9C : #<Function %LOCK-FREE-REHASH #x00003000000B2F0F> + 141
(#x00007F7502647F00) #x00003000000B29F4 : #<Function LOCK-FREE-REHASH #x00003000000B291F> + 213
(#x00007F7502647F40) #x00003000000B2294 : #<Function LOCK-FREE-COUNT-ENTRIES #x00003000000B220F> + 133
[...]
(#x00007F7502655680) #x00003000000960B4 : #<Function GETHASH #x0000300000095E4F> + 613
(#x00007F75026556D0) #x000030200297F85C : #<Function INTERN-EQUAL-OBJECT #x000030200297F7CF> + 141
(#x00007F75026556E8) #x0000302002B0659C : #<Function (:INTERNAL BUILD-FN12015 BWIN-XML-PARSER) #x0000302002B0654F> + 77
(#x00007F7502655748) #x0000302002A09714 : #<Function MAYBE-BUILD-GAME-INTERNAL #x0000302002A096AF> + 101
(#x00007F7502655780) #x0000302002B07974 : #<Function (:INTERNAL ***-XML-PARSER) #x0000302002B0750F> + 1125
(#x00007F7502655828) #x0000302002A8D9FC : #<Function DOM-TRAVERSAL-HELPER #x0000302002A8D80F> + 493
(#x00007F7502655888) #x0000302002A8E1AC : #<Function DOM-TRAVERSAL-HELPER #x0000302002A8D80F> + 2461
(#x00007F7502655948) #x0000302002A8E1AC : #<Function DOM-TRAVERSAL-HELPER #x0000302002A8D80F> + 2461
(#x00007F7502655A08) #x0000302002A8E1AC : #<Function DOM-TRAVERSAL-HELPER #x0000302002A8D80F> + 2461
(#x00007F7502655AC8) #x0000302002A8C9FC : #<Function DOM-TRAVERSAL #x0000302002A8C82F> + 461
(#x00007F7502655B60) #x0000302002A04A04 : #<Function PROCESS-FEED-INTERNAL #x0000302002A043BF> + 1605
(#x00007F7502655C30) #x0000302002A05D04 : #<Function PROCESS-FEED #x0000302002A05A6F> + 661
(#x00007F7502655CB0) #x00003020029FC43C : #<Function (:INTERNAL PROCESS-NEXT-FEED) #x00003020029FB7AF> + 3213
(#x00007F7502655D50) #x0000302002414C24 : #<Function (:INTERNAL MAKE-TASK) #x000030200241471F> + 1285
(#x00007F7502655DE8) #x000030200240BE3C : #<Function (:INTERNAL NEW-WORKER-THREAD) #x000030200240BADF> + 861
(#x00007F7502655E68) #x0000302000F1EFDC : #<Function (:INTERNAL BINDING-DEFAULT-SPECIALS) #x0000302000F1ECBF> + 797
(#x00007F7502655EB0) #x00003000004718E4 : #<Function RUN-PROCESS-INITIAL-FORM #x000030000047160F> + 725
(#x00007F7502655F48) #x0000300000472204 : #<Function (:INTERNAL (%PROCESS-PRESET-INTERNAL (PROCESS))) #x000030000047207F> + 389
(#x00007F7502655F98) #x000030000044F66C : #<Function (:INTERNAL THREAD-MAKE-STARTUP-FUNCTION) #x000030000044F53F> + 301

(gui::background-process-run-function 'foo1 (lambda () (print "I'm dead")))

(gui::background-process-run-function 'foo2 (lambda () (loop (sleep 1))))

Executing the above two forms causes the expected results: a second Listener that says "I'm dead".

However, if you close that Listener window, the window comes back when you hit cmd-L (even though its process is dead). Windows attached to dead Listener processes should be deleted completely once closed.

Apple has decided that renaming some structures dealing with thread contexts and the fields in those structures would help to ensure compatibility with some C standard or other; the names of these fields therefore depend on what header files one looks at (and what -preserve-broken-legacy-behavior options are in effect.)

Lisp code occasionally needs to poke around in these structures, and therefore defines its own set of record types with its own field names "manually".

The manual definition of :darwin-ppc-thread-state64 in ccl/level-1/ppc-trap-support.lisp has been wrong; the structure is defined with #pragma pack(4) in effect, so some 64-bit fields that should be misaligned are actually (and incorrectly) naturally aligned.

One consequence of this is that backtrace doesn't work on darwinppc64 in some contexts, e.g., after a keyboard interrupt. There may be other consequences, as well.