Message-ID: <4366708B.4080900@unsolicited.net>
Date: Mon, 31 Oct 2005 19:29:15 +0000
From: David R <david@unsolicited.net>
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To: linux-kernel@vger.kernel.org
Subject: Kernel 2.6.14 and old versions of traceroute
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I've noticed that old versions of traceroute no longer work properly
with the latest kernel. 2.6.13.4 is OK. I've done a bit of strace and am
posting the differences here. These are from a 64 bit kernel using
traceroute 0.6.2 as shipped with most versions of SuSE. I have confirmed
that the same problem is present in a 32 bit kernel on a different
machine. A later traceroute 1.4a12 works properly.

2.6.13.4

poll([{fd=6, events=POLLERR, revents=POLLERR}, {fd=3, events=POLLERR},
{fd=4, events=POLLERR}, {fd=5, events=POLLERR}], 4, 1) = 1
recvmsg(6, {msg_name(16)={sa_family=AF_INET, sin_port=htons(33443),
sin_addr=inet_addr("69.10.132.115")}, msg_iov(0)=[], msg_controllen=80,
{cmsg_len=32, cmsg_level=SOL_SOCKET, cmsg_type=0x1d /* SCM_??? */, ...},
msg_flags=MSG_ERRQUEUE}, MSG_ERRQUEUE) = 0


2.6.14
poll([{fd=3, events=POLLERR, revents=POLLERR}, {fd=4, events=POLLERR},
{fd=5, events=POLLERR}, {fd=6, events=POLLERR}, {fd=7, events=POLLERR},
{fd=8, events=POLLERR}], 6, 1) = 1
recvmsg(3, 0x7fffffa30960, MSG_ERRQUEUE) = -1 EAGAIN (Resource
temporarily unavailable)
....
....
poll([{fd=3, events=POLLERR, revents=POLLERR}, {fd=4, events=POLLERR,
revents=POLLERR}, {fd=5, events=POLLERR}, {fd=6, events=POLLERR}, {fd=7,
events=POLLERR}, {fd=8, events=POLLERR}, {fd=9, events=POLLERR}], 7, 1) = 2
recvmsg(3, 0x7fffffa30960, MSG_ERRQUEUE) = -1 EAGAIN (Resource
temporarily unavailable)
recvmsg(4, 0x7fffffa30960, MSG_ERRQUEUE) = -1 EFAULT (Bad address)

I'm up for more diagnostics if necessary.

Cheers
David

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