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    SubjectRe: The Deadly `ping -f'
    Hello Greg, all,

    On Sat, 17 Apr 1999, Greg Zornetzer wrote:

    > On Sun, 18 Apr 1999, Taneli Vahakangas wrote:
    > > The machine fell into the ever-interesting land of __delay, __udelay and
    > > __global_cli (as witnessed with SysRq-P), and was not able to respond
    > > outside pings. Unfortunately, SysRq-U (or -S) didn't work.
    > I tried to reproduce this quickly on my machine: Uniprocessor with 3c509
    > compiled into the kernel. I ran a flood ping (using Alexy Kuznetsov's
    > fixed ping program) from my machine to 2 other machines on a personal lan,
    > as well as a flood ping to the machine's own ethernet address, and a flood
    > ping on loopback. The machine was totally stable (if a bit slow) - it's a
    > P66.
    > Anyway, maybe the problem is some SMP locking issue not present on UP.
    > Could you try recompiling the kernel uniprocessor and run the exact same
    > test (just be careful you remake all of the modules uniprocessor).

    Yes, it is SMP indeed. A UP kernel+modules works allright, using either
    3c509 or eexpress. A SMP kernel fails with both. The eexpress driver is
    more interesting, though, it spits out these:

    eth0: tx interrupt but no status

    while doing "The Double Flood Ping" and afterwards all networking is
    wedged, it only says:

    eth0: i82586 reset timed out, kicking (5 times in a row)
    eth0: i82586 not responding, giving up.

    Then I said
    # ifconfig down
    # ifconfig up
    and the machine locked up again. But as I said, UP kernel works pretty
    well -- although it says "tx interrupt but no status" during ping -f, it
    doesn't crash the machine.

    Taneli <>

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