Kernel 2.6.14 and old versions of traceroute

From: David R (david_at_unsolicited.net)
Date: 10/31/05

  • Next message: Yuval: "Re: [Linux-NTFS-Dev] [2.6-GIT] NTFS: Release 2.1.25." 
    Date:	Mon, 31 Oct 2005 19:29:15 +0000
To: linux-kernel@vger.kernel.org

    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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