Re: stat of /proc fails after CPU hot-unplug with EOVERFLOW in 2.6.18

[Martin Devera <devik@cdi.cz>]

Andrew Morton wrote:
> On Wed, 27 Sep 2006 09:55:47 +0200
> Martin Devera <devik@cdi.cz> wrote:
>
> > Hello,
> >
> > I have 2way Opteron machine. I've done this:
> > echo 0 > /sys/devices/system/cpu/cpu1/online
> >
> > and then strace stat /proc:
> >
> > [snip]
> > personality(PER_LINUX)                  = 4194304
> > getpid()                                = 14926
> > brk(0)                                  = 0x804b000
> > brk(0x804b1a0)                          = 0x804b1a0
> > brk(0x804c000)                          = 0x804c000
> > stat("/proc", 0xbf8e7490)               = -1 EOVERFLOW
> >
> > When I do echo 1 > ... to start cpu again then the stat starts
> > to work again ... Weird.
>
> boggle.
>
> Can you add this patch, see where it's going bad?

Ehh .. I finally learned how to code jprobe (I can't reboot the machine now),
tested, installed and ... guess what ? The overflow bug is gone :-(
It simply works now.
I will reboot it next week and try again.

thanks for a help and sorry for your wasted time,
Martin
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