Re: 2.4.22pre8 hangs too (Re: 2.4.21-jam1 solid hangs)

[Ville Herva <vherva@niksula.hut.fi>]

On Thu, Aug 28, 2003 at 10:13:41AM +0900, you [TeJun Huh] wrote:
> 
>  Your problem sounds very simlar to the problem we were suffering.
> The problem was a spinlock deadlock inside drivers/char/random.c which
> is used by tcp to generate random initial sequence number.  The bug
> fix was checked into 2.4 tree on 28th July after the release of pre8
> at 14th July.

Uhh, I tried 2.4.22pre8 a while ago (I think it was Herbert Pötzl's
suggestion), and it locked up too. Shame that the fix didn't make it in
it...

I'll give .22-final a spin.
 
> This problem can happen on UP machine if the kernel is compiled with
> CONFIG_SMP.

This is UP box and the kernel is _not_ compiled with CONFIG_SMP.

> Because the offending routine is called only every five
> minutes and it should receive a SYN packet while it's connecting, it
> occurs rarely, but it happens when it happens.

In my case, the lock up seems clearly related to disk io: it usually happens
during the nightly oracle backup dump, and at some point it kept happening
while compiling kernel. (It's random, I can no longer reproduce it by just
compiling a kernel.)

Do you still think it could be the same one?

>  Please try 2.4.22.
> 
> P.S. This bug is a real headache.  We had many servers deployed and
> they all randomly locked up about every two or four weeks.  I believe
> people should be warned about this one.

What's really strange is that the box kept running with 2.4.20pre7 for
almost a year without problems (with the same oracle dump jub in nightly
cron), and then suddenly begun acting up on my the first day of my summer
vacation...


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