I have had several kernel panics the last few weeks, and I have only had em when I had aiccu running my ayiya tunnel . I have tried for a few days without aiccu and no kernel panics at all. I'm not a kernel log reader, but when I read route.c and rtunref, it sort of could be related to a ipv6 tunnel ? All the kernel panics I had where all with the same logfiles, maybe the problem is the tun/tap driver, but maybe someone could enlight me on that issue I'm running Mac OSX 10.5.6 and I have the self compiled from source aiccu. My tun/tap driver version I have no idea how to find out, my systemprofiler is not very verbose on the version. Here is the log: Mon Apr 13 18:26:48 2009 panic(cpu 0 caller 0x002232C6): "rtunref: bad refcnt 0 for rt=0x3e2dab0\n"@/SourceCache/xnu/xnu-1228.9.59/bsd/net/route.c:460 Backtrace (CPU 0), Frame : Return Address (4 potential args on stack) 0x3411fd28 : 0x12b4f3 (0x45b13c 0x3411fd5c 0x1335e4 0x0) 0x3411fd78 : 0x2232c6 (0x473df8 0x0 0x3e2dab0 0x0) 0x3411fd98 : 0x2237ba (0x3e2dab0 0x1 0x3411fde8 0x136713) 0x3411fdc8 : 0x224a66 (0x3e2dab0 0x2 0x8 0xf81a0120) 0x3411fde8 : 0x26c219 (0x3e2dab0 0x53076c 0x10 0x0) 0x3411fe68 : 0x229b69 (0x30135700 0x30135700 0x3411feb8 0x34ddd8c0) 0x3411fea8 : 0x34ddd1e4 (0x1e 0x30135700 0x3411fef8 0x34dda21d) 0x3411fec8 : 0x2151cf (0x5ec9204 0x1e 0x30135700 0x30135734) 0x3411fef8 : 0x21595b (0x52ad64 0x93b5808 0x30135734 0x3411ff4c) 0x3411ff68 : 0x215bb9 (0x0 0x30135700 0x0 0x52ade8) 0x3411ffc8 : 0x1a017c (0x52adc0 0x0 0x1a30b5 0x38953c8) Backtrace terminated-invalid frame pointer 0 Kernel loadable modules in backtrace (with dependencies): foo.tun(1.0)@0x34dd9000->0x34ddefff BSD process name corresponding to current thread: kernel_task Mac OS version: 9G55 Kernel version: Darwin Kernel Version 9.6.0: Mon Nov 24 17:37:00 PST 2008; root:xnu-1228.9.59~1/RELEASE_I386 System model name: MacBookPro2,2 (Mac-F42187C8)