netdev - Fw: [Bug 59971] New: tcp_info::tcpi_last_ack

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Message-ID: <20130620082425.3bb6266a@nehalam.linuxnetplumber.net>
Date:	Thu, 20 Jun 2013 08:24:25 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	netdev@...r.kernel.org
Subject: Fw: [Bug 59971] New: tcp_info::tcpi_last_ack_recv = 0xFFFFFFF6



Begin forwarded message:

Date: Thu, 20 Jun 2013 04:20:40 -0700
From: "bugzilla-daemon@...zilla.kernel.org" <bugzilla-daemon@...zilla.kernel.org>
To: "stephen@...workplumber.org" <stephen@...workplumber.org>
Subject: [Bug 59971] New: tcp_info::tcpi_last_ack_recv = 0xFFFFFFF6


https://bugzilla.kernel.org/show_bug.cgi?id=59971

           Summary: tcp_info::tcpi_last_ack_recv = 0xFFFFFFF6
           Product: Networking
           Version: 2.5
    Kernel Version: 2.6.37
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Other
        AssignedTo: shemminger@...ux-foundation.org
        ReportedBy: _kobold@....net
        Regression: No


tcp_info::tcpi_last_ack_recv becomes "negative" sometimes. -10 msec or 1 jiffy
in my case. Probably due to lack of synchronization in the kernel.

struct tcp_info tinfo = {0};
socklen_t len = sizeof(tinfo);
if (getsockopt(thesocket, SOL_TCP, TCP_INFO, (void*)&tinfo, &len) == 0)
    printf("%u\n", tinfo.tcpi_last_ack_recv);

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