Re: OOPS (kswapd) in 2.4.5 and 2.4.6

From: Andrew Morton (
Date: Sat Jul 07 2001 - 03:07:30 EST

Henry wrote:
> ...
> So far, so good. There has not been a single oops on the two principle
> servers I patched.
> uptime1: 8:04am up 18:22, 1 user, load average: 0.09, 0.15, 0.11
> uptime2: 8:04am up 18:25, 1 user, load average: 0.15, 0.20, 0.15

OK, that looks good.

> Andrew my china, you are the _MAN_!

Not only that - I have great legs!

> We should know by monday afternoon
> (the monday morning/midday crunch should provide some valuable
> feedback).

I wonder why it only affects you. Is the drive which holds
your swap partition running in PIO mode? `hdparm' will tell
you. If it is, then that could easily cause the page to come
unlocked before brw_page() has finished touching the buffer
ring. Then all it takes is a parallel try_to_free_buffers
on the other CPU.

There's a similar bug in __block_write_full_page(). I'll
send a patch...

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This archive was generated by hypermail 2b29 : Sat Jul 07 2001 - 21:00:20 EST