Re: rtfree: 0xffffff00036fb1e0 has 1 refs

Based on some comments in rtfree, we should only be calling rtfree if we
are sure we own the last reference to the route. I am not sure this is the
case in the stf/gif cases... Please try the attached patch and let me know
if there are any ill effects.

On Fri, Aug 24, 2007 at 12:17:26PM +0400, Yuri Pankov wrote:
> Hi,
> 
> I've recently started using he.net's ipv6 tunnel and getting this message:
> rtfree: 0xffffff00036fb1e0 has 1 refs
> 
> I've added kdb_backtrace() in route.c as Gleb Smirnoff suggested before. Here's
> backtrace:
> rtfree: 0xffffff00036fb1e0 has 1 refs
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
> rtfree() at rtfree+0xba
> gif_encapcheck4() at gif_encapcheck4+0x118
> gif_encapcheck() at gif_encapcheck+0xfd
> encap4_input() at encap4_input+0xcc
> ip_input() at ip_input+0xc0
> tunwrite() at tunwrite+0x1d5
> giant_write() at giant_write+0x51
> devfs_write_f() at devfs_write_f+0x9c
> dofilewrite() at dofilewrite+0x85
> kern_writev() at kern_writev+0x4c
> write() at write+0x54
> syscall() at syscall+0x1ce
> Xfast_syscall() at Xfast_syscall+0xab
> --- syscall (4, FreeBSD ELF64, write), rip = 0x80125c35c, rsp = 0x7fffffffda18,
> rbp = 0x60 ---
> 
> 
> ifconfig:
> gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1280
>         tunnel inet 194.186.18.14 --> 64.71.128.83
>         inet6 fe80::20f:eaff:fe7d:f320%gif0 prefixlen 64 scopeid 0x5 
>         inet6 2001:470:1f03:2d5::2 --> 2001:470:1f03:2d5::1 prefixlen 128 
>         inet6 2001:470:1f01:725::1 prefixlen 64 
> tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500
>         inet6 fe80::20f:eaff:fe7d:f320%tun0 prefixlen 64 scopeid 0x6 
>         inet 194.186.18.14 --> 194.186.18.2 netmask 0xffffff00 
>         Opened by PID 458
> 
> 
> Yuri
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-- 
Christian S.J. Peron
csjp_at_FreeBSD.ORG
FreeBSD Committer