"David S. Miller" wrote:
>
> Date: Thu, 09 Nov 2000 21:53:42 +1100
> From: Andrew Morton <andrewm@uow.edu.au>
>
> "David S. Miller" wrote:
> > I will compose a patch to fix all this.
>
> I've quickly been through just about all of the kernel wrt
> waitqueues.
>
> My analysis was in error, BEWARE!
>
> Being on multiple wait queues at once is just fine. I verified this
> with Linus tonight.
>
> The problem case is in mixing TASK_EXCLUSIVE and non-TASK_EXCLUSIVE
> sleeps, that is what can actually cause problems.
>
> Everything else is fine. Anyways, the (untested) patch below should
> cure the lock_sock() cases.
>
> --- ./net/ipv4/af_inet.c.~1~ Tue Oct 24 14:26:18 2000
> +++ ./net/ipv4/af_inet.c Wed Nov 8 17:28:47 2000
[...]
> --- ./net/ipv4/tcp.c.~1~ Fri Oct 6 15:45:41 2000
> +++ ./net/ipv4/tcp.c Wed Nov 8 17:35:31 2000
This touches the places where I saw hangs, so I'm testing.
Too soon to have statistics, but with this patch I have
observed no more failures to wake (what I referred to as
"soft hangs").
I have seen a total I/O lockup, but no info escapes to
indicate its source. No NMI wakeup available, maybe I should
rig a pushbutton.
Tom
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