Segmentation fault @ checkpoint

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Hi,

i'm trying out the checkpointer (version 15 from http://git.ncl.cs.columbia.edu/?p=linux-cr.git;a=shortlog;h=refs/heads/ckpt-v15) 
.

i used the the example programs at the checkpointer documentation:  
test.c and ckpt.c (i had to add #define __NR_checkpoint 333)

after compilation i tried:
./test &
kill -STOP 3058                3058 = PID from test
./ckpt 3058 > ckpt.image

now i get a Segmentation fault (it's at the syscall(__NR_checkpoint.  
pid, STDOUT_FILENO, 0) line).

dmesg:
[ 3948.213442] ckpt[3218]: segfault at 46 ip b7e1213d sp bf835e18  
error 4 in libc-2.7.so[b7db4000+155000]

Any idea what may be the problem?
Do i have a problem with my libc?

My System spec:
Debian 5.0 i686
CPU: AMD Athlon XP 2000+

Regards,
Gordon
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