Messages in this thread | | | Date | Tue, 10 Aug 1999 18:45:01 +0930 (CST) | From | Mofeed Shahin <> | Subject | Re: 2.3.12 - klogd 100% CPU && Bogus Buffer memory count |
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Well Chuck, I have just tried using the same cd again and yes it is reproducable. As soon as I get one of these :
Aug 10 18:16:26 tt2 kernel: attempt to access beyond end of device Aug 10 18:16:26 tt2 kernel: 0b:00, want=532574, limit=532572
klogd starts using 100% CPU.
So it looks like the race condition is in the cdrom layer.
Anything else I can do to try find this bug, I will be happy to do.
Cheers Mof.
On Fri, 6 Aug 1999, Chuck Lever wrote:
> mofeed- > > there's a race somewhere that's causing shrink_mmap to deduct too much > from buffermem, making it go negative. i don't think that it's specific > to a particular driver. i haven't been able to simply and consistently > reproduce the race -- maybe you could come up with some way to do this? > is it specific to how much data you copied, for instance? > > On Fri, 6 Aug 1999, Mofeed Shahin wrote: > > First off I will explain what I was doing that caused the problem. > > I was copying a whole CD to the hard-drive. They are both scsi AIC7xxx. > > > > While I was copying I noticed Xosview not looking too healthy so I ran top > > and noticed that the amount of buffer memory was obviously wrong. > > > > here is the vmstat output : > > > > :vmstat > > procs memory swap io system cpu > > r b w swpd free buff cache si so bi bo in cs us sy id > > 1 0 0 744 2908 4193304 205452 0 0 2 4 52 14 47 0 53 > > ^^^^^^^ > > Notice the 4.1 GIG of buffer memory. > > > > Also half way through the copy klogd started using up all the CPU time on > > one of the processors. > > Even after the copy had finished klogd was still using up large amounts of > > CPU (100%). > > - Chuck Lever > -- > corporate: <chuckl@netscape.com> > personal: <chucklever@netscape.net> or <cel@monkey.org> > > The Linux Scalability project: > http://www.citi.umich.edu/projects/linux-scalability/ >
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