Re: [XenAccess-devel] Segmentation fault when calling the same function twice

[Bryan D. P. <br...@th...>]

Looks like you have uncovered a bug :-)  I looked at it this morning  
and found the cause.  I wasn't doing proper cleanup on the cache when  
xa_destroy was called.  The fix is already in the repository, in case  
you'd like to try it out.  Thanks for reporting this...

-bryan



On Aug 24, 2006, at 7:12 AM, Daniele Sgandurra wrote:

> Hi!
> I've tried to build a simple library, sort of a
> wrapper for your examples (process-list,
> process-data). It seems there are little problems when
> calling two times the same function. For example, if I
> modify the file process-list.c, in this way (I've
> replaced the name "main" with "mainb" and created
> another "main" that calls two times "mainb"):
>
> int mainb (int argc, char **argv)
> {
>     xa_instance_t xai;
>     unsigned char *memory = NULL;
>     uint32_t offset, next_process, list_head;
>     char *name = NULL;
>     int pid = 0;
>
> ......
> }
>
> int main (int argc, char **argv)
> {
>   printf("first\n");
>   mainb(argc, argv);
>   printf("second\n");
>   mainb(argc, argv);
>   return 0;
> }
>
> I get a segmentation fault error:
>
> [examples]# ./run ./process-list 1
> first
> [    1] init
> [    2] migration/0
> [    3] ksoftirqd/0
> [    4] watchdog/0
> [    5] events/0
> [    6] khelper
> [    7] kthread
> [    8] xenwatch
> [    9] xenbus
> [   16] kblockd/0
> [   20] khubd
> [   58] pdflush
> [   59] pdflush
> [   61] aio/0
> [   60] kswapd0
> [  577] kseriod
> [  657] kpsmoused
> [  660] nash-hotplug
> [  678] kjournald
> [ 1098] syslogd
> [ 1104] klogd
> [ 1148] exim4
> [ 1154] inetd
> [ 1163] sshd
> [ 1180] atd
> [ 1183] cron
> [ 1198] login
> [ 1199] getty
> [ 1200] getty
> [ 1201] getty
> [ 1202] getty
> [ 1203] getty
> [ 1204] bash
> [ 1218] sshd
> [ 1222] sftp-server
> second
> ./run: line 4:  6347 Segmentation fault      $@
> [examples]#
>
> I'm using Xenaccess 0.2 on Fedora 5, with Xen 3.0.2-2.
> I 've tried to find the problem and probably it's
> something with xa_access_kernel_symbol routine.
> Thanks
>
>
>
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-
Bryan D. Payne
Graduate Student, Computer Science
Georgia Tech Information Security Center
http://www.bryanpayne.org