linux-kernel - Re: ipc-msg broken again on 3.11-rc7? (was Re: linux-next: Tree for Jun 21 [ BROKEN ipc/ipc-msg ])

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Date:	Thu, 29 Aug 2013 05:04:40 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	Davidlohr Bueso <davidlohr.bueso@...com>,
	linux-next <linux-next@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>, Andi Kleen <andi@...stfloor.org>,
	Rik van Riel <riel@...hat.com>,
	Manfred Spraul <manfred@...orfullife.com>,
	Jonathan Gonzalez <jgonzalez@...ets.cl>
Subject: Re: ipc-msg broken again on 3.11-rc7? (was Re: linux-next: Tree for
 Jun 21 [ BROKEN ipc/ipc-msg ])

On Wed, Aug 28, 2013 at 1:58 PM, Vineet Gupta
<Vineet.Gupta1@...opsys.com> wrote:
> Hi David,
>
> On 06/26/2013 04:59 AM, Davidlohr Bueso wrote:
>> On Tue, 2013-06-25 at 23:41 +0200, Sedat Dilek wrote:
>>> On Tue, Jun 25, 2013 at 10:33 PM, Davidlohr Bueso
>>> <davidlohr.bueso@...com> wrote:
>>>> On Tue, 2013-06-25 at 18:10 +0200, Sedat Dilek wrote:
>>>> [...]
>>>>
>>>>> I did some more testing with Linux-Testing-Project (release:
>>>>> ltp-full-20130503) and next-20130624 (Monday) which has still the
>>>>> issue, here.
>>>>>
>>>>> If I revert the mentioned two commits from my local
>>>>> revert-ipc-next20130624-5089fd1c6a6a-ab9efc2d0db5 GIT repo, everything
>>>>> is fine.
>>>>>
>>>>> I have tested the LTP ***IPC*** and ***SYSCALLS*** testcases.
>>>>>
>>>>>    root# ./runltp -f ipc
>>>>>
>>>>>    root# ./runltp -f syscalls
>>>>
>>>> These are nice test cases!
>>>>
>>>> So I was able to reproduce the issue with LTP and manually running
>>>> msgctl08. We seemed to be racing at find_msg(), so take to q_perm lock
>>>> before calling it. The following changes fixes the issue and passes all
>>>> 'runltp -f syscall' tests, could you give it a try?
>>>>
>>>
>>> Cool, that fixes the issues here.
>>>
>>> Building with fakeroot & make deb-pkg is now OK, again.
>>>
>>> The syscalls/msgctl08 test-case ran successfully!
>>
>> Andrew, could you pick this one up? I've made the patch on top of
>> 3.10.0-rc7-next-20130625
>
> LTP msgctl08 hangs on 3.11-rc7 (ARC port) with some of my local changes. I
> bisected it, sigh... didn't look at this thread earlier :-( and landed into this.
>
> ------------->8------------------------------------
> 3dd1f784ed6603d7ab1043e51e6371235edf2313 is the first bad commit
> commit 3dd1f784ed6603d7ab1043e51e6371235edf2313
> Author: Davidlohr Bueso <davidlohr.bueso@...com>
> Date:   Mon Jul 8 16:01:17 2013 -0700
>
>     ipc,msg: shorten critical region in msgsnd
>
>     do_msgsnd() is another function that does too many things with the ipc
>     object lock acquired.  Take it only when needed when actually updating
>     msq.
> ------------->8------------------------------------
>
> If I revert 3dd1f784ed66 and 9ad66ae "ipc: remove unused functions" - the test
> passes. I can confirm that linux-next also has the issue (didn't try the revert
> there though).
>
> 1. arc 3.11-rc7 config attached (UP + PREEMPT)
> 2. dmesg prints "msgmni has been set to 479"
> 3. LTP output (this is slightly dated source, so prints might vary)
>
> ------------->8------------------------------------
> <<<test_start>>>
> tag=msgctl08 stime=1377689180
> cmdline="msgctl08"
> contacts=""
> analysis=exit
> initiation_status="ok"
> <<<test_output>>>
> ------------->8-------- hung here ------------------
>
>
> Let me know if you need more data/test help.
>

Cannot say much to your constellation as I had the issue on x86-64 and
Linux-next.
But I have just seen a post-v3.11-rc7 IPC-fix in [1].

I have here a v3.11-rc7 kernel with drm-intel-nightly on top... did not run LTP.

Which LTP release do you use?
Might be good to attach your kernel-config for followers?

- Sedat -

[1] http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=368ae537e056acd3f751fa276f48423f06803922
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