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Date: Mon, 4 Oct 2004 01:35:48 -0700
From: Andrew Morton <akpm@osdl.org>
To: Jason Stubbs <jstubbs@work-at.co.jp>
Cc: linux-kernel@vger.kernel.org
Subject: Re: PROBLEM: Consistent lock up on >=2.6.8
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Jason Stubbs <jstubbs@work-at.co.jp> wrote:
>
> I'm getting consistent hangs under heavy load on 2.6.8.1, 2.6.9-rc2 and 
>  2.6.9-rc3. I have tested on 2.6.7 and have no problems at all. I can 
>  reproduce the problem in less than 10 minutes by repeatedly running a cpu 
>  intensive process such as openssl while the system performs its regular 
>  tasks.
> 
>  SysRq works and I was able to pull the registers (which are always very 
>  similar) and the last 50 lines of the task list. If more of the task list is 
>  necessary, I'll go out and buy a serial cable to get it. All information 
>  provided is from 2.6.9-rc3.
> 
> ...
> 
>  Pid: 22433, comm:              openssl
>  EIP: 0060:[<c02d5082>] CPU: 0
>  EIP is at _spin_lock+0xa/0x13
>   EFLAGS: 00000286    Not tainted  (2.6.9-rc3)
>  EAX: c03b2500 EBX: 00000000 ECX: x031ca80 EDX: 00000000
>  ESI: f8b9c926 EDI: ffffffff EBP: c03e1f44 DS: 007b ES: 007b
>  CR0: 8005003b CR2: b7df91df CR3: 3705c000 CR4: 000006d0

Looks like a locking bug.  

>  Stack pointer is garbage, not printing trace

Sigh.  That's exactly the info we wanted.  Please try 2.6.9-rc3-mm1 which
should have that fixed.  Or wait 15 minutes for 2.6.9-rc3-mm2.

Then do the sysrq-P trace again.  You may need to type it a few times.  If
you manage to get a backtrace of the process which is stuck in spin_lock,
that's the info we want.

You may find that all CPUs are stuck in spin_lock().  If so, please send
each CPU's backtrace.  If you have to type it all in, don't worry about the
eight-digit hex numbers.

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