From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Davidlohr Bueso <dave.bueso@gmail.com>,
Sedat Dilek <sedat.dilek@gmail.com>,
Davidlohr Bueso <davidlohr.bueso@hp.com>,
linux-next <linux-next@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>, Andi Kleen <andi@firstfloor.org>,
Rik van Riel <riel@redhat.com>,
Jonathan Gonzalez <jgonzalez@linets.cl>
Subject: Re: ipc-msg broken again on 3.11-rc7?
Date: Tue, 3 Sep 2013 08:44:17 +0000 [thread overview]
Message-ID: <C2D7FE5348E1B147BCA15975FBA23075141642@IN01WEMBXA.internal.synopsys.com> (raw)
In-Reply-To: 5224BCF6.2080401@colorfullife.com
On 09/02/2013 09:59 PM, Manfred Spraul wrote:
> Hi,
>
> [forgot to cc everyone, thus I'll summarize some mails...]
> On 09/02/2013 06:58 AM, Vineet Gupta wrote:
>> On 08/31/2013 11:20 PM, Linus Torvalds wrote:
>>> Vineet, actual patch for what Davidlohr suggests attached. Can you try it?
>>>
>>> Linus
>> Apologies for late in getting back to this - I was away from my computer for a bit.
>>
>> Unfortunately, with a quick test, this patch doesn't help.
>> FWIW, this is latest mainline (.config attached).
>>
>> Let me know what diagnostics I can add to help with this.
> msgctl08 is a bulk message send/receive test. I had to look at it once
> before, then it was a broken hardware:
> https://lkml.org/lkml/2008/6/12/365
> This can be ruled out, because it works with 3.10.
>
> msgctl08 uses pairs of threads: one thread does msgsnd(), the other one
> msgrcv().
> There is no synchronization, i.e. the msgsnd() can race ahead until the
> kernel buffer is full and then a block with msgrcv() follows or it could
> be pairs of alternating msgsnd()/msgrcv() operations.
> No special features are used: each pair of threads has it's own message
> queues, all messages have type=1.
>
> Vineet ran strace - and just before the signal from killing msgctl08,
> there are only msgsnd()/msgrcv() calls.
> Vineet:
> a) could you run strace tomorrow again, with '-ttt' as an additional
> option? I don't see where exactly it hangs.
Yet to do this.
> b) Could you check that it is not just a performance regression?
> Does ./msgctl08 1000 16 hang, too?
Nope that doesn't hang. The minimal configuration that hangs reliably is msgctl
50000 2
With this config there are 3 processes.
...
555 554 root S 1208 0.4 0 0.0 ./msgctl08 50000 2
554 551 root S 1208 0.4 0 0.0 ./msgctl08 50000 2
551 496 root S 1208 0.4 0 0.0 ./msgctl08 50000 2
...
[ARCLinux]$ cat /proc/551/stack
[<80aec3c6>] do_wait+0xa02/0xc94
[<80aecad2>] SyS_wait4+0x52/0xa4
[<80ae24fc>] ret_from_system_call+0x0/0x4
[ARCLinux]$ cat /proc/555/stack
[<80c2950e>] SyS_msgrcv+0x252/0x420
[<80ae24fc>] ret_from_system_call+0x0/0x4
[ARCLinux]$ cat /proc/554/stack
[<80c28c82>] do_msgsnd+0x116/0x35c
[<80ae24fc>] ret_from_system_call+0x0/0x4
Is this a case of lost wakeup or some such. I'm running with some more diagnostics
and will report soon ...
-Vineet
next prev parent reply other threads:[~2013-09-03 8:44 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-21 19:34 linux-next: Tree for Jun 21 [ BROKEN ipc/ipc-msg ] Sedat Dilek
2013-06-21 22:07 ` Davidlohr Bueso
2013-06-21 22:54 ` Sedat Dilek
2013-06-21 23:11 ` Davidlohr Bueso
2013-06-21 23:14 ` Sedat Dilek
2013-06-21 23:15 ` Sedat Dilek
2013-06-25 16:10 ` Sedat Dilek
2013-06-25 20:33 ` Davidlohr Bueso
2013-06-25 21:41 ` Sedat Dilek
2013-06-25 23:29 ` Davidlohr Bueso
2013-08-28 11:58 ` ipc-msg broken again on 3.11-rc7? (was Re: linux-next: Tree for Jun 21 [ BROKEN ipc/ipc-msg ]) Vineet Gupta
2013-08-29 3:04 ` Sedat Dilek
2013-08-29 7:21 ` Vineet Gupta
2013-08-29 7:52 ` Sedat Dilek
2013-08-30 8:19 ` Vineet Gupta
2013-08-30 8:27 ` Sedat Dilek
2013-08-30 8:46 ` ipc-msg broken again on 3.11-rc7? Vineet Gupta
[not found] ` <CALE5RAvaa4bb-9xAnBe07Yp2n+Nn4uGEgqpLrKMuOE8hhZv00Q@mail.gmail.com>
2013-08-30 16:31 ` Davidlohr Bueso
2013-08-31 17:50 ` Linus Torvalds
2013-09-02 4:58 ` Vineet Gupta
2013-09-02 16:29 ` Manfred Spraul
2013-09-03 7:16 ` Sedat Dilek
2013-09-03 7:34 ` Vineet Gupta
2013-09-03 7:49 ` Manfred Spraul
2013-09-03 8:43 ` Sedat Dilek
2013-09-03 8:44 ` Vineet Gupta [this message]
2013-09-03 8:57 ` Manfred Spraul
2013-09-03 9:16 ` Vineet Gupta
2013-09-03 9:23 ` Manfred Spraul
2013-09-03 9:51 ` Vineet Gupta
2013-09-03 10:16 ` Manfred Spraul
2013-09-03 10:32 ` ipc msg now works (was Re: ipc-msg broken again on 3.11-rc7?) Vineet Gupta
2013-09-03 22:46 ` Sedat Dilek
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