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

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Message-ID: <480C6597.1000701@gmail.com>
Date:	Mon, 21 Apr 2008 11:59:51 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Al Viro <viro@...IV.linux.org.uk>
CC:	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 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.
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