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

From: Martin Devera
Date: Wed Sep 27 2006 - 10:44:39 EST

Andrew Morton wrote:
On Wed, 27 Sep 2006 09:55:47 +0200
Martin Devera <devik@xxxxxx> wrote:


I have 2way Opteron machine. I've done this:
echo 0 > /sys/devices/system/cpu/cpu1/online

and then strace stat /proc:

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.


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,
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