lkml.org 
[lkml]   [1996]   [May]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: Alan's bug catalogue

    In article <4ojt5a$qd3@nz12.rz.uni-karlsruhe.de>,
    Olaf Erb <erb@inss1.etec.uni-karlsruhe.de> wrote:
    >In article <m0uOsZW-0005FrC@lightning.swansea.linux.org.uk>,
    >Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
    >>TCP hang 2.0 pre7
    >
    >Maybe that's the same: sendmail (8.7.5) hangs while connect() with no
    >timer running (pre7, 8, 9):
    >
    >tcp 0 0 myself.uni-karlsruhe.de:1126 blah.de:smtp
    >SYN_SENT myself off (0.00/0)
    >
    >then connect() never fails and sendmail hangs until it's killed.

    I've seen sockets that get stuck in this state as well. It doesn't
    happen very often for me, but when it happens, the connect also never
    finishes without killing the program.

    One other problem I have seen at least though 2.0 pre7 was ip
    forwarding was still failing for me when the data was over a few K.
    Telneting from one linux machine through another linux machine to
    a SunOS machine would hang when I tried to display a large amount
    of information at once (I run trn, and it hangs trying to display
    the screen).

    I've done a tcp dump of around the time of the hang, and I'm seeing
    lots of acks to the same packet. The connection to the SunOS machine
    at netcom is via a SLIP connection.

    # tcpdump "host zeego && host netcom10.netcom.com"
    <Cut>
    19:39:44.509778 netcom10.telnet > zeego.1036: . ack 80 win 16000
    19:39:44.529778 netcom10.telnet > zeego.1036: . 1453:1457(4) ack 80 win 16000
    19:39:44.689778 zeego.1036 > netcom10.telnet: . ack 1457 win 31744
    19:39:44.949778 netcom10.telnet > zeego.1036: . 1457:1526(69) ack 80 win 16000
    19:39:45.109778 zeego.1036 > netcom10.telnet: . ack 1526 win 31744
    19:39:45.249778 netcom10.telnet > zeego.1036: . 1526:2535(1009) ack 80 win 16000
    19:39:45.409778 zeego.1036 > netcom10.telnet: . ack 2535 win 31744
    19:39:45.649778 netcom10.telnet > zeego.1036: . 3975:3995(20) ack 80 win 16000
    19:39:45.649778 zeego.1036 > netcom10.telnet: . ack 2535 win 31744
    19:39:45.709778 netcom10.telnet > zeego.1036: . 3995:4183(188) ack 80 win 16000
    19:39:45.709778 zeego.1036 > netcom10.telnet: . ack 2535 win 31744
    19:39:45.829778 netcom10.telnet > zeego.1036: . 4183:4589(406) ack 80 win 16000
    19:39:45.829778 zeego.1036 > netcom10.telnet: . ack 2535 win 31744
    19:39:46.059778 zeego.1036 > netcom10.telnet: . ack 2535 win 31744

    ****************************************************************************
    Hang occurs around here (Maybe a bit earlier from the looks of the acks)
    ****************************************************************************

    19:39:55.449778 netcom10.telnet > zeego.1036: . 3975:3995(20) ack 80 win 16000
    19:39:55.449778 zeego.1036 > netcom10.telnet: . ack 2535 win 31744
    19:39:55.509778 netcom10.telnet > zeego.1036: . 3995:4183(188) ack 80 win 16000
    19:39:55.509778 zeego.1036 > netcom10.telnet: . ack 2535 win 31744
    19:39:55.629778 netcom10.telnet > zeego.1036: . 4183:4589(406) ack 80 win 16000
    19:39:55.629778 zeego.1036 > netcom10.telnet: . ack 2535 win 31744
    19:39:55.859778 zeego.1036 > netcom10.telnet: . ack 2535 win 31744
    19:40:05.479778 netcom10.telnet > zeego.1036: . 3975:3995(20) ack 80 win 16000
    19:40:05.479778 zeego.1036 > netcom10.telnet: . ack 2535 win 31744
    19:40:05.539778 netcom10.telnet > zeego.1036: . 3995:4183(188) ack 80 win 16000
    19:40:05.539778 zeego.1036 > netcom10.telnet: . ack 2535 win 31744
    19:40:05.659778 netcom10.telnet > zeego.1036: . 4183:4589(406) ack 80 win 16000
    19:40:05.659778 zeego.1036 > netcom10.telnet: . ack 2535 win 31744
    19:40:05.889778 zeego.1036 > netcom10.telnet: . ack 2535 win 31744
    19:40:15.489778 netcom10.telnet > zeego.1036: . 3975:3995(20) ack 80 win 16000
    <Cut>

    Gordon Chaffee
    chaffee@bugs-bunny.cs.berkeley.edu




    \
     
     \ /
      Last update: 2005-03-22 13:37    [W:0.021 / U:2.228 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site