Hi, Same situation like the panic i reported last month (http://lists.freebsd.org/pipermail/freebsd-stable/2005-March/013066.html ) but this time without ipl(4) in the kernel. I closed my laptop lid without closing the ssh session and boom the NAT gateway (running 5.4-PRERELEASE) crashed. db> where Tracing pid 27 tid 100021 td 0xc107f190 kdb_enter(c06ca9e8) at kdb_enter+0x2b panic(c06e1733,c1346a00,c0c6aae0,c06c929b,c06e1717) at panic+0xbb uma_dbg_free(c0c6aae0,0,c1346a00) at uma_dbg_free+0x110 uma_zfree_arg(c0c6aae0,c1346a00,0) at uma_zfree_arg+0xf3 m_freem(c1346a00,c1346a00,c1598a00,4,41) at m_freem+0x36 fr_check(c1346a50,14,c1120000,0,ca8a8c88) at fr_check+0xce8 fr_check_wrapper(0,ca8a8c88,c1120000,1,0) at fr_check_wrapper+0x2a pfil_run_hooks(c075f8a0,ca8a8cd4,c1120000,1,0) at pfil_run_hooks+0xbd ip_input(c1346a00) at ip_input+0x231 netisr_processqueue(c075eb38) at netisr_processqueue+0x6e swi_net(0) at swi_net+0x88 ithread_loop(c1074500,ca8a8d48,c1074500,c0520610,0) at ithread_loop+0x124 fork_exit(c0520610,c1074500,ca8a8d48) at fork_exit+0xa4 fork_trampoline() at fork_trampoline+0x8 Unfortunately still no gdb dump... regards tilman