linux-kernel - Re: [PATCHSET #master] sysfs: make sysfs disconnect immediately on deletion, take 2

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Message-ID: <462455D7.3050908@gmail.com>
Date:	Tue, 17 Apr 2007 14:06:31 +0900
From:	Tejun Heo <htejun@...il.com>
To:	maneesh@...ibm.com
CC:	gregkh@...e.de, dmitry.torokhov@...il.com,
	cornelia.huck@...ibm.com, oneukum@...e.de, rpurdie@...ys.net,
	James.Bottomley@...elEye.com, stern@...land.harvard.edu,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET #master] sysfs: make sysfs disconnect immediately on
 deletion, take 2

Hello, Maneesh.

Maneesh Soni wrote:
> I started looking at these patches and parallely also did some testing on a 
> 8 CPU system. I am using the patches from Greg's tree at
> http://www.kernel.org/pub/scm/linux/kernel/git/gregkh/patches.git/
> 
> I ran following loops parallelly
> 
> # while true; do insmod drivers/net/dummy.ko; sleep 1;rmmod dummy; done
> # while true; do find /sys/class/net/dummy0 | xargs cat; sleep 1; done
> # while true; do umount /sys; sleep 1; mount -t sysfs none /sys; done
> # while true; do find /sys | xargs cat > /dev/null; sleep 1; done
> 
> and got the following oops
> 
> Unable to handle kernel NULL pointer dereference at 000000000000004c RIP:
>  [<ffffffff802935b4>] simple_unlink+0x14/0x5c

Eeek... I'll try to replicate and track down the bug here.  FWIW, SCSI
also oopses if udev is running due to a bug in SCSI open/close handling.

Thanks for testing.

-- 
tejun
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