linux-kernel - Re: wait_even_interruptible_timeout(), signal, spin

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Date:	Sun, 6 Jun 2010 10:00:19 +0200
From:	Maciej Rutecki <maciej.rutecki@...il.com>
To:	Shirish Pargaonkar <shirishpargaonkar@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"linux-fsdevel" <linux-fsdevel@...r.kernel.org>
Subject: Re: wait_even_interruptible_timeout(), signal, spin_lock() = system hang

I created a Bugzilla entry at 
https://bugzilla.kernel.org/show_bug.cgi?id=16139
for your bug report, please add your address to the CC list in there, thanks!

On piątek, 28 maja 2010 o 18:44:46 Shirish Pargaonkar wrote:
> After this sequence of calls, system hangs (smp, x86 box based with
> .34 kernel), can ping only.
> I have not been able to break in with Alt Sysrq t, working on that
> 
>         rc = wait_event_interruptible_timeout(ses->server->response_q,
>                         (midQ->midState != MID_REQUEST_SUBMITTED),
>  timeout); if (rc < 0) {
>                 cFYI(1, ("command 0x%x interrupted", midQ->command));
>                 return -1;
>         }
> 
> and when function that invoking function after coming out with ERESTARTSYS
> (I kill the command with Ctrl C) calls
>  spin_lock(&GlobalMid_Lock);
> 
> system hangs.  If I sleep before return -1 (e.g. msleep(1), no hang)
> 
> I do not have to use wait_event_interruptible_timeout and no such problems
>  with wait_event_timeout, it is only when signal/interrupt is involved, I
>  run into this problem
> 
> Any pointers/ideas what could be happening, would be really really
>  appreciated.
> 
> Regards,
> 
> Shirish
> --
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-- 
Maciej Rutecki
http://www.maciek.unixy.pl
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