Re: 3.7-rc7: BUG: MAX_STACK_TRACE_ENTRIES too low!

[Li Zhong <zhong@linux.vnet.ibm.com>]

On Sat, 2012-12-01 at 12:32 -0800, Christian Kujau wrote:
> 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@nerdbynature.de>

Thank you, Christian. 

I'll try to submit a patch for it.

Thanks, Zhong

> 
> 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
>