linux-kernel - Re: Top 10 kernel oopses for the week ending January 5th, 2008

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Message-ID: <20080105212634.GM27894@ZenIV.linux.org.uk>
Date:	Sat, 5 Jan 2008 21:26:34 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	NetDev <netdev@...r.kernel.org>
Subject: Re: Top 10 kernel oopses for the week ending January 5th, 2008

On Sat, Jan 05, 2008 at 01:06:17PM -0800, Arjan van de Ven wrote:
> Rank 3: d_splice_alias
> 	NULL pointer deref
> 	Reported 3 times
> 	Happens in the isofs code
> 	Only seen in 2.6.24-rc5-mm1
> 	More info: http://www.kerneloops.org/search.php?search=d_splice_alias

in -rc6-mm1 as well, fixes on l-k...
 
> Rank 8: evdev_disconnect
> 	kernel page fault
> 	Reported 2 times (10 total reports)
> 	Previously seen in older kernels including 2.6.21 but as far back as 
> 	2.6.16
> 	More info: 
> 	http://www.kerneloops.org/search.php?search=evdev_disconnect

Practically certain to be fixed by 6addb1d6de1968b84852f54561cc9a999909b5a9;
it's list_for_each_entry() walking from the entry that just got list_del()
and kernels without that sucker have no protection of the list in question
whatsoever.
 
> Rank 9: mutex_lock
> 	kernel null pointer due to rfcomm_tty_close sysfs interaction
> 	Reported 2 times (9 total reports)
> 	Ranked 9th last week as well
> 	More info: http://www.kerneloops.org/search.php?search=mutex_lock

pissfs locking problems; AFAICS, its sysfs_get_dentry() walking into
already unlinked sysfs directory node on the way to target; no exclusion
against that is there and it's not trivial to add.
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