kmem_cache_alloc в net/netfilter/nf_conntrack_core.c nf_conntrack_alloc () возвращают ПУСТОЙ УКАЗАТЕЛЬ. Ядро не могло выделить память.
Проверьте свободный memore (кошка/proc/meminfo и slabtop).
The files you want are located in /var/lib/mailman the directories you want to copy are
/var/lib/mailman/data
/var/lib/mailman/archives
/var/lib/mailman/lists
After you have migrated the server just run
check_perms -f
To fix the permissions