Re: rtfree: 0xffffff00036fb1e0 has 1 refs

On Mon, Aug 27, 2007 at 06:59:03PM -0500, Christian S.J. Peron wrote:
> 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
> > _______________________________________________
> > freebsd-current_at_freebsd.org mailing list
> > http://lists.freebsd.org/mailman/listinfo/freebsd-current
> > To unsubscribe, send any mail to "freebsd-current-unsubscribe_at_freebsd.org"
> 
> -- 
> Christian S.J. Peron
> csjp_at_FreeBSD.ORG
> FreeBSD Committer

Thanks for reply. I've used your patch and reinstalled kernel. But I haven't
found reliable way to reproduce this problem (sometimes it manifests right after
establishing connection, sometimes after several ppp restarts, etc.). Anyway,
I'll report back if I'll see it again.


Thanks,
Yuri