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From: Manfred Spraul <manfred@colorfullife.com>
To: Vineet Gupta <Vineet.Gupta1@synopsys.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, 03 Sep 2013 10:57:10 +0200	[thread overview]
Message-ID: <5225A466.2080303@colorfullife.com> (raw)
In-Reply-To: <C2D7FE5348E1B147BCA15975FBA23075141642@IN01WEMBXA.internal.synopsys.com>

On 09/03/2013 10:44 AM, Vineet Gupta wrote:
>> 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 ...
What is the output of ipcs -q? Is the queue full or empty when it hangs?
I.e. do we forget to wake up a receiver or forget to wake up a sender?

--
     Manfred

  reply	other threads:[~2013-09-03  8:57 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
2013-09-03  8:57                                   ` Manfred Spraul [this message]
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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