linux-kernel - Re: 3.7-rc7: BUG: MAX_STACK_TRACE

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Date:	Sat, 1 Dec 2012 12:32:11 -0800 (PST)
From:	Christian Kujau <lists@...dbynature.de>
To:	Li Zhong <zhong@...ux.vnet.ibm.com>
cc:	LKML <linux-kernel@...r.kernel.org>, linuxppc-dev@...ts.ozlabs.org,
	paulus@...ba.org
Subject: Re: 3.7-rc7: BUG: MAX_STACK_TRACE_ENTRIES too low!

On Wed, 28 Nov 2012 at 16:41, Li Zhong wrote:
> On Tue, 2012-11-27 at 19:22 -0800, Christian Kujau wrote:
> > On Tue, 27 Nov 2012 at 19:06, Christian Kujau wrote:
> > > the same thing[0] happened again in 3.7-rc7, after ~20h uptime:
> > 
> > I found the following on patchwork, but this seems to deal with powerpc64 
> > only, while this PowerBook G4 of mine is powerpc32:
> > 
> >   http://patchwork.ozlabs.org/patch/193414/
> > 
> > It looks related, but then again, I fail to parse assember...
> 
> Hi Christian, 
> 
> Would you please help to try the following fix? I don't have a powerpc32
> machine for test...

After 3 days of uptime with your patch applied (and "normal" usage, just 
as before) no such BUG message occured. So, from my point of view, feel
free to add:

   Tested-by: Christian Kujau <lists@...dbynature.de>

Thanks!
Christian.

> ==============================================
> diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
> index 9499385..cadebfd 100644
> --- a/arch/powerpc/kernel/entry_32.S
> +++ b/arch/powerpc/kernel/entry_32.S
> @@ -439,6 +439,8 @@ ret_from_fork:
>  ret_from_kernel_thread:
>  	REST_NVGPRS(r1)
>  	bl	schedule_tail
> +	li	r3,0
> +	stw	r3,0(r1)
>  	mtlr	r14
>  	mr	r3,r15
>  	PPC440EP_ERR42
> ==============================================
> 
> > 
> > Christian.
> > 
> > > [40007.339487] [sched_delayed] sched: RT throttling activated
> > > [69731.388717] BUG: MAX_STACK_TRACE_ENTRIES too low!
> > > [69731.390371] turning off the locking correctness validator.
> > > [69731.391942] Call Trace:
> > > [69731.393525] [c9a61c10] [c0009064] show_stack+0x70/0x1bc (unreliable)
> > > [69731.395152] [c9a61c50] [c0077460] save_trace+0xfc/0x114
> > > [69731.396735] [c9a61c60] [c007be20] __lock_acquire+0x1568/0x19b8
> > > [69731.398296] [c9a61d00] [c007c2c0] lock_acquire+0x50/0x70
> > > [69731.399857] [c9a61d20] [c0550e28] _raw_spin_lock_irq+0x5c/0x78
> > > [69731.401419] [c9a61d40] [c054fb58] __schedule+0xd8/0x534
> > > [69731.402972] [c9a61da0] [c0550094] _cond_resched+0x50/0x68
> > > [69731.404527] [c9a61db0] [c0479908] dst_gc_task+0xbc/0x258
> > > [69731.406070] [c9a61e40] [c004eeb8] process_one_work+0x1f4/0x49c
> > > [69731.407585] [c9a61e80] [c004f644] worker_thread+0x14c/0x400
> > > [69731.409075] [c9a61eb0] [c0057634] kthread+0xbc/0xc0
> > > [69731.410521] [c9a61f40] [c0011ad4] ret_from_kernel_thread+0x5c/0x64
> > > [...repeated 54 times...]
> > > 
> > > Anyone knows what this is about?
> > > 
> > > Thanks,
> > > Christian.
> > > 
> > > [0] http://lkml.indiana.edu/hypermail/linux/kernel/1211.0/03025.html

-- 
BOFH excuse #267:

The UPS is on strike.
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