NACK
The same faulty behaviour persists with linux-
image-3.13.0-33-generic=3.13.0-33.58~lp1349768v201407290941 (uname
3.13.0-33-generic #58~lp1349768v201407290941).
I do not notice any difference; identical symptoms. `rmmod ip_vs_rr
ip_vs` continues to immediately resolve the fault.
Note that my configuration also includes openvswitch. The tftp stall
continues to happen when flushing the ipvs ruleset, only unloading the
ip_vs module resolves it. However, only re-loading the ip_vs_rr module
does not trigger the stall, but loading the ipvs ruleset does. My IPVS
ruleset consists of only four TCP "Masq" forwards.
Using ktrace to try and get a rough stack trace, I was able to observe
the following sequences:
dnsmasq-5012 [001] .... 2060.572946: ipv6_find_hdr
<-ip_vs_out.part.23
dnsmasq-5012 [001] .... 2060.572955: <stack trace>
=> ip_vs_local_reply6
=> nf_iterate
=> nf_hook_slow
=> __ip_local_out
=> ip_local_out
=> ip_send_skb
=> udp_send_skb
=> udp_sendmsg
=> inet_sendmsg
=> sock_sendmsg
=> SYSC_sendto
=> SyS_sendto
=> tracesys
dnsmasq-5012 [001] .... 2060.572956: ipv6_find_hdr
<-ip_vs_out_icmp_v6.isra.22
dnsmasq-5012 [001] .... 2060.572963: <stack trace>
=> ip_vs_out.part.23
=> ip_vs_local_reply6
=> nf_iterate
=> nf_hook_slow
=> __ip_local_out
=> ip_local_out
=> ip_send_skb
=> udp_send_skb
=> udp_sendmsg
=> inet_sendmsg
=> sock_sendmsg
=> SYSC_sendto
=> SyS_sendto
=> tracesys
with the first sequence being repeated for every packet (?) and the
second, slightly different, sequence corresponding per the timestamp to
the dmesg:
[ 2060.572964] IPv6 header not found
This is with a my full iptables rulset loaded, but my OUTPUT DROP rules
counters do not indicate any matches. The ftrace output seems to be
identical with the iptables ruleset flushed.
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https://bugs.launchpad.net/bugs/1349768
Title:
kernel 3.13.0-32 ipvs "IPv6 header not found" related to UDP socket
sendto() EPERM errors
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