linux-kernel - Re: fault in __d_lookup [Was: 2.6.25-mm1]

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Date:	Mon, 21 Apr 2008 15:42:30 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: fault in __d_lookup [Was: 2.6.25-mm1]

On Monday, 21 of April 2008, Jiri Slaby wrote:
> On 04/21/2008 11:45 AM, Al Viro wrote:
> > On Mon, Apr 21, 2008 at 11:37:40AM +0200, Jiri Slaby wrote:
> >> On 04/21/2008 11:06 AM, Al Viro wrote:
> >>> On Mon, Apr 21, 2008 at 10:31:40AM +0200, Jiri Slaby wrote:
> >>>
> >>>        hlist_for_each_entry_rcu(dentry, node, head, d_hash) {
> >>>                struct qstr *qstr;
> >>>
> >>>                if (dentry->d_name.hash != hash)
> >>>                        continue;
> >>>
> >>> walking into node == (struct hlist_node *)0x00f0000000000000...
> >> Yup, true, In the last oops I stuck on memcmp few lines below.
> >>
> >> BTW. it's 100% reproducible after it happens once, but fixable by reboot. 
> >> Any tests I should run (memtest, some printks sticked anywhere)?
> > 
> > Well, if list has such turd in it, you'll certainly hit it every time
> > you walk that list, so 100% reproducible is not surprising.
> > 
> > How well is it reproducible from fresh boot?
> 
> Few days with suspend/resume cycles. This one was booted 12 hours ago, one 
> suspend/resume. Will keep an eye on it and keep you informed.

I think that's exactly the same problem I reported here:
http://lkml.org/lkml/2008/4/20/182
for 2.6.25-git2, so it hit the mainline and seems to be related to RCU.

Thanks,
Rafael
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