linux-kernel - Re: [LKP] [fanotify] 66ba93c0d7f: i6300esb: Unexpected close, not stopping watchdog!

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Date:	Fri, 24 Apr 2015 22:52:40 +0200
From:	Lino Sanfilippo <LinoSanfilippo@....de>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Huang Ying <ying.huang@...el.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: Re: [LKP] [fanotify] 66ba93c0d7f: i6300esb: Unexpected close, not
 stopping watchdog!

On 24.04.2015 19:42, Andrew Morton wrote:
> On Thu, 23 Apr 2015 14:25:38 +0800 Huang Ying <ying.huang@...el.com> wrote:
> 
>> FYI, we noticed the below changes on
>> 
>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> commit 66ba93c0d7fe63def447ad0afe380307ff9ebcad ("fanotify: don't set FAN_ONDIR implicitly on a marks ignored mask")
>> 
>> When doing LTP test.  Test system hang after doing some fanotify test cases, while system
>> can run to reboot in the parent comments.
> 
> Thanks.  I've queued a reversion patch.  I'll hold off sending it to
> Linus for a while, to see if we can get this fixed up.
> 
> 
> What does "hang" mean?  Was the machine all locked up?  Or is it the
> case that the particular LTP test failed to complete?  I suspect the
> latter - that the new notify behaviour is differing from LTP's
> expectation in some fashion?
> 

Hi,

I think your suspicion is right, it looks like an issue that has been
reported a few weeks ago:
http://marc.info/?l=linux-kernel&m=142688498719023&w=2

The reason was not in kernel code though (as assumed by the reporter)
but a missing FAN_ONDIR in the code of the fanotify02 test case (that
flag was not needed before since it was set implicitly under certain
conditions - see the commit message of
66ba93c0d7fe63def447ad0afe380307ff9ebcad for details). The code has been
fixed in the latest version of LTP. I tested fanotify with this version
(20150420) and all tests passed.
Huang could it be that you did not use the latest LTP?

Regards,
Lino
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