Re: Serious reproducible 2.4.x kernel hang

[Chris Evans]

On Thu, 1 Feb 2001, Malcolm Beattie wrote:

> Chris Evans writes:
> > I've just managed to reproduce this personally on 2.4.0. I've had a report
> > that 2.4.1 is also affected. Both myself and the other person who
> > reproduced this have SMP i686 machines, which may or may not be relevant.
> >
> > To reproduce, all you need to do is get my vsftpd ftp server:
> > ftp://ferret.lmh.ox.ac.uk/pub/linux/vsftpd-0.0.9.tar.gz
>
> I got this just before lunch too. I was trying out 2.4.1 + zerocopy
> (with netfilter configured off, see the sendfile/zerocopy thread for

[...]

I reproduced with 2.4.1.

> Looking at the kernel's EIP every so often to see what was going
> showed remove_wait_queue, add_wait_queue, skb_recv_datagram and
> wait_for_packet mostly. Random thought: if vsftpd did a sendfile and
> then exited, becoming a zombie, could there be a problem with
> tearing down a sendfile mapping? I'm off to read some code.

I get it simply doing CTRL-C at the ftp logon prompt. No sendfile has been
used at this point. Trying to distill a test case...

Cheers
Chris