Bugzilla – Bug 147075
IPv6 broken (xfrm_lookup: IPv4 route is stale)
Last modified: 2006-02-09 11:12:41 UTC
I hit this with today's KOTD when doing some IPv6 testing. It's not possible to ping to offlink hosts. dmesg shows: xfrm_lookup: IPv4 route is stale (obsolete=4294967295, loops=0) [<c0279deb>] xfrm_lookup+0x403/0x481 [<e142878b>] ipv6_dev_get_saddr+0x4ff/0x585 [ipv6] [<e142456a>] ip6_dst_lookup+0x1e7/0x250 [ipv6] [<e14409a8>] ip6_datagram_connect+0x2e5/0x418 [ipv6] [<c022d6d5>] release_sock+0x10/0x9b [<c026cb37>] inet_dgram_connect+0x45/0x4e [<c022cbf2>] sys_connect+0x76/0x98 [<c014db91>] fd_install+0x24/0x50 [<c022c353>] sock_map_fd+0x10d/0x117 [<c022bba8>] __sock_create+0x15d/0x1a2 [<c022cd2f>] sys_socketcall+0x8c/0x19e [<c0102a3b>] sysenter_past_esp+0x54/0x79 I'll try to take care of this, building a test kernel with some debug printks right now. I submited it to bugzilla just in case someone else hits it as well.
*** Bug 147206 has been marked as a duplicate of this bug. ***
What happens when you use a kerneltest kernel that doesn't include that change yet? ------------------------------------------------------------------- Mon Jan 30 17:23:51 CET 2006 - okir@suse.de - patches.fixes/xfrm-endless-loop: Try to fix infinite loop in xfrm_lookup (117749, 115200).
the one before that patch works fine
kernel-smp-2.6.16_rc1_git3-20060130145842 (x86_64)
Ok I will drop it from CVS then for beta3 until Olaf debugs it.
*** Bug 147040 has been marked as a duplicate of this bug. ***
It's dropped.
I confirm that Olaf's patch mentioned in #2 is the culprit. I reverted the single patch and IPv6 started to work. Olaf: I don't quite understand the difference between dst->obsolete being set to 0 and -1, but it's initialized to -1 by ip6_route_add() and that's where your check fails. Maybe you want to test for dst->obsolete > 0 instead of != 0 ?
I guess we can lower the severity since the patch is dropped now. Maybe it would be better to reopen the original bug that lead to the broken patch and close this one.
That would be our old friend the hanging ipsec bug. Should still be open I think.
Sorry, but this hits us badly on S/390 with Beta3. X11 installation via CTC is basically unuseable.
Well well well... I think I deserve this for giving in to requests to add what was essentially a debug patch :-/
*** Bug 147656 has been marked as a duplicate of this bug. ***
*** Bug 148120 has been marked as a duplicate of this bug. ***
*** Bug 148653 has been marked as a duplicate of this bug. ***
An updated xfrm-lookup patch is now in CVS