In the source code, ksym_mod.c, we have
----
ksyms = fopen(KSYMS, "r");
if ( ksyms == NULL )
{
if ( errno == ENOENT )
Syslog(LOG_INFO, "No module symbols loaded - "
"kernel modules not enabled.\n");
else
Syslog(LOG_ERR, "Error loading kernel symbols " \
"- %s\n", strerror(errno));
fclose(ksyms);
return(0);
}
----
On OpenVZ, /proc/kallsyms (=KSYMS) does not exist. So ksyms == NULL.
Then we fclose a NULL file descriptor? => Segfault.
The trivial patch:
http://launchpadlibrarian.net/37613199/dont-fclose-null.patch
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