netdev - Re: regression when connecting to ipv6 localhost

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Date:	Sun, 14 Oct 2012 22:45:46 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jan Hinnerk Stosch <janhinnerk.stosch@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: regression when connecting to ipv6 localhost

On Sun, 2012-10-14 at 22:39 +0200, Jan Hinnerk Stosch wrote:
> 2012/10/14 Eric Dumazet <eric.dumazet@...il.com>:
> > On Sun, 2012-10-14 at 22:27 +0200, Eric Dumazet wrote:
> >
> >> Also post :
> >>
> >
> > # grep Udp6 /proc/net/snmp6
> >
> > Before and after your "ntpq -p" try
> >
> >
> 
> Sorry, my fault. I executed the command as user not root:
> lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system
> /run/user/1000/gvfs
>       Output information may be incomplete.
> COMMAND PID USER   FD      TYPE             DEVICE SIZE/OFF   NODE NAME
> ntpd    368  ntp  cwd       DIR                8,2     4096      2 /
> ntpd    368  ntp  rtd       DIR                8,2     4096      2 /
> ntpd    368  ntp  txt       REG                8,2   582944 418889 /usr/bin/ntpd
> ntpd    368  ntp  mem       REG                8,2    84832 396501
> /usr/lib/libresolv-2.16.so
> ntpd    368  ntp  mem       REG                8,2    22936 396440
> /usr/lib/libnss_dns-2.16.so
> ntpd    368  ntp  mem       REG                8,2    52136 396470
> /usr/lib/libnss_files-2.16.so
> ntpd    368  ntp  mem       REG                8,2    18760 400111
> /usr/lib/libattr.so.1.1.0
> ntpd    368  ntp  mem       REG                8,2   137998 396481
> /usr/lib/libpthread-2.16.so
> ntpd    368  ntp  mem       REG                8,2    88656 399537
> /usr/lib/libz.so.1.2.7
> ntpd    368  ntp  mem       REG                8,2    14648 396487
> /usr/lib/libdl-2.16.so
> ntpd    368  ntp  mem       REG                8,2  2009849 396474
> /usr/lib/libc-2.16.so
> ntpd    368  ntp  mem       REG                8,2    16776 400227
> /usr/lib/libcap.so.2.22
> ntpd    368  ntp  mem       REG                8,2    31760 396469
> /usr/lib/librt-2.16.so
> ntpd    368  ntp  mem       REG                8,2  2392233 405328
> /usr/lib/libcrypto.so.1.0.0
> ntpd    368  ntp  mem       REG                8,2  1022344 396456
> /usr/lib/libm-2.16.so
> ntpd    368  ntp  mem       REG                8,2   165344 396512
> /usr/lib/ld-2.16.so
> ntpd    368  ntp    0u      CHR                1,3      0t0   1028 /dev/null
> ntpd    368  ntp    1u      CHR                1,3      0t0   1028 /dev/null
> ntpd    368  ntp    2u      CHR                1,3      0t0   1028 /dev/null
> ntpd    368  ntp    3u     unix 0xffff880214dfbb80      0t0  11432 socket
> ntpd    368  ntp    5w      REG                8,2        0 664219
> /var/log/ntp.log
> ntpd    368  ntp   16u     IPv4              10453      0t0    UDP *:ntp
> ntpd    368  ntp   17u     IPv6              10454      0t0    UDP *:ntp
> ntpd    368  ntp   18u     IPv4              10460      0t0    UDP
> localhost.localdomain:ntp
> ntpd    368  ntp   19u     IPv4              10461      0t0    UDP
> hinniepc.fritz.box:ntp
> ntpd    368  ntp   20u     IPv6               8775      0t0    UDP
> [fe80::922b:34ff:fe33:c292]:ntp
> ntpd    368  ntp   21u  netlink                         0t0  10463 ROUTE
> 
> and here is "grep Udp6 /proc/net/snmp6" before:
> Udp6InDatagrams                 	19
> Udp6NoPorts                     	0
> Udp6InErrors                    	0
> Udp6OutDatagrams                	19
> Udp6RcvbufErrors                	0
> Udp6SndbufErrors                	0
> 
> and after running "ntpq -p":
> Udp6InDatagrams                 	21
> Udp6NoPorts                     	0
> Udp6InErrors                    	0
> Udp6OutDatagrams                	21
> Udp6RcvbufErrors                	0
> Udp6SndbufErrors                	0

OK so IPv6 UDP frames are delivered to ntpd

could you strace it while doing one "ntpq -p"

strace -p 368


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