[Devel] Re: Segmentation fault @ checkpoint

[Ralph-Gordon Paul]

Am 13.05.2009 um 23:37 schrieb Serge E. Hallyn:

> Quoting Ralph-Gordon Paul (Ralph-Gordon.Paul at uni-duesseldorf.de):
>> 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).
>
> Hi Gordon,
>
> Just to make sure, did you check out the v15-dev branch of user-cr?
> By default you get the v14 branch which is not compatible.  I
> suspect you're using v14 becaues sys_checkpoint is being
> called with flags 0, not 4, which is (now) wrong.
>
> thanks,
> -serge

Hi Serge,

That was the problem. :-)
Now i have the linux-cr v15-dev  and user-cr v15-dev.

Thanks very much :-)

Gordon


>
>> 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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