[Openmcl-devel] ccl crashes

Mario S. Mommer m_mommer at yahoo.com
Tue Jan 19 21:23:38 UTC 2010


the attached file contains some simple code that can be used to crash
ccl 1.4. I downloaded ccl 1.4 using subversion. I'm running it on Ubuntu
Jaunty (9.04), 64 bits, and on a stock kernel.

uname -a gives

Linux padme 2.6.28-17-generic #58-Ubuntu SMP Tue Dec 1 21:27:25 UTC 2009 x86_64 GNU/Linux

What I do is start two threads doing a simple computation intended to
use cycles. The observed behavior is erratic, as it takes a variable
time before ccl exits with a segfault:

mommer at padme:~/local/src/ccl$ ls
cocoa-ide         doc       library         lx86cl.image  x86-headers64
compiler          examples  lisp-kernel     objc-bridge   xdump
contrib           level-0   lx86cl          scripts
coretest.lisp     level-1   lx86cl64        tools
coretest.lx64fsl  lib       lx86cl64.image  x86-headers
mommer at padme:~/local/src/ccl$ lx86cl64 
Welcome to Clozure Common Lisp Version 1.4-r13119  (LinuxX8664)!
?  (compile-file "coretest.lisp")
? (load "coretest")     
? (coretest::start-threads 2 #'coretest::consing-f)
? Segmentation fault
mommer at padme:~/local/src/ccl$ 

It makes a difference if I compile the file or not (in the later case,
there is some chance that it won't crash). Also, if I do as follows,

mommer at padme:~/local/src/ccl$ lx86cl64 
Welcome to Clozure Common Lisp Version 1.4-r13119  (LinuxX8664)!
? (defun f ()
  (let ((x 2.0d0))
    (dotimes (i most-positive-fixnum)
      (setf x (sqrt x)))
? (loop repeat 2 collecting
     (ccl:process-run-function (format nil "~A" (random 1.0d0)) #'f))
(#<PROCESS 0.4779367736939041D0(2) [Active] #x30004116568D> #<PROCESS 0.9475384938042208D0(3) [Reset] #x3000411641AD>)

then it doesn't crash, although sometimes (!) one thread decides it
doesn't like it.

> Error: value #C(0.0D0 1.0D0) is not of the expected type REAL.
> While executing: COMPLEX, in process 0.9475384938042208D0(3).

;;; #<PROCESS 0.9475384938042208D0(3) [Active] #x30004113FB0D> requires access to Shared Terminal Input
;;; Type (:y 3) to yield control to this thread.
(:y 3)

;;; Shared Terminal Input is now owned by #<PROCESS 0.9475384938042208D0(3) [Active] #x30004113FB0D>

> Type :POP to abort, :R for a list of available restarts.
> Type :? for other options.
1 > :B
 (7F0105D4DE38) : 0 (COMPLEX 0 #C(0.0D0 1.0D0)) 1669
 (7F0105D4DE88) : 1 (F) 61
 (7F0105D4DEB0) : 2 (RUN-PROCESS-INITIAL-FORM #<PROCESS 0.9475384938042208D0(3) [Active] #x30004113FB0D> (#<COMPILED-LEXICAL-CLOSURE # #x30004113F8AF>)) 725
 (7F0105D4DF48) : 3 (FUNCALL #'#<(:INTERNAL (CCL::%PROCESS-PRESET-INTERNAL (PROCESS)))> #<PROCESS 0.9475384938042208D0(3) [Active] #x30004113FB0D> (#<COMPILED-LEXICAL-CLOSURE # #x30004113F8AF>)) 389
1 > 

Any ideas?



P.S: here is the code:

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