Cron issues after upgrade to 7.0

After I've upgraded to 7.0 I cannot acces my cron jobs and I am not sure are they working at all.

Output of "sudo strace -o /tmp/cron.strace cron -l" attached.

$ ps awx |grep cron
1798 ? Ss 0:00 cron

$ ls -l /var/run/crond.*
-rw-r--r-- 1 root root 5 ное 13 09:00 /var/run/crond.pid
---------- 1 root root 0 ное 13 09:00 /var/run/crond.reboot

$ cron -l
cron: can't open or create /var/run/crond.pid: Permission denied

$ sudo cron -l
no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory
cron: can't lock /var/run/crond.pid, otherpid may be 1798: Resource temporarily unavailable

$ sudo cat /var/run/crond.pid
1798