Re: libax25 axio_flush bug hangs node and fix

From: Jeroen Vreeken (kzbjxras@mx.dy.fi)
Date: Thu Oct 17 2002 - 22:17:21 EEST

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    On 2002.10.17 20:41:54 +0200 Kjell Jarl wrote:
    > > No it isn't. This bug is only in 0.0.10. What exactly freezes?
    >
    > I get a kernel panic. Similar to
    >
    > > <0> Kernel panic: Aiee, killing interrupt handler!
    > > In interrupt handler - not syncing
    >
    > I do not have a recent write down.
    >
    > I am using a USCC card, which I have been suspecting before. But it
    > seems to be related to either netrom/node disconnects possibly with
    > outstanding frames or tcp/ip started from node, or an DISC/UA at the
    > ax.25 link layer.
    >
    > I have seen the DISC/UA in listen on a frozen vnc screen before (vnc)
    > tcp retried out and the screen wanished.

    I have a been chasing a bug that seems similar lately....
    It looks like something goes wrong in sock_def_write_space(). It is called
    as a result of kfree_skb().
    I have been trying to find the cause of it but have been unsuccessfull
    sofar.
    The problem I have is that it only occurs about once a week, so any fix I
    think I make takes at least a week to test :( unless I find a way to
    trigger it faster.

    Jeroen

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