VSX Gateway might crash if SecureXL is disabled in the context of Virtual System 0.

The following function stack is seen during the crash:

#0 [...] crash_kexec at ...
#1 [...] kdb_main_loop at ...
#2 [...] kdb_save_running at ...
#3 [...] kdba_main_loop at ...
#4 [...] kdb at ...
#5 [...] die at ...
#6 [...] do_page_fault at ...
#7 [...] error_code (via page_fault) at ...
#8 [...] [simmod] dos_frag_should_drop(vsid=0, pkt=0x..., conn=0x...) at dosenf.c
#9 [...] [simmod] erdos_should_drop_frag(...) at erdos.c
#10 [...] [simmod] handle_inbound_packet(...) at sim_pkt.c
#11 [...] [simmod] sim_fromlinux(...) at linux_filter.c
#12 [...] netif_receive_skb_do(...) at dev.c
#13 [...] netif_receive_skb(...) at dev.c
#14 [...] ixgbe_poll() at ...
#15 [...] net_rx_action(...) at dev.c
#16 [...] __do_softirq() at softirq.c
#17 [...] do_softirq() at softirq.c
#18 [...] do_IRQ(regs=0x...) at irq.c
#19 [...] common_interrupt at ...
#20 [...] mwait_idle() at bitops.h
#21 [...] cpu_idle() at process.c