From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Tejun Heo <tj@kernel.org>
Cc: Linux/PPC Development <linuxppc-dev@ozlabs.org>,
David Miller <davem@davemloft.net>
Subject: Re: 2.6.31-git5 kernel boot hangs on powerpc
Date: Fri, 25 Sep 2009 13:40:06 +1000 [thread overview]
Message-ID: <1253850006.7103.505.camel@pasglop> (raw)
In-Reply-To: <4ABC376D.1020704@kernel.org>
On Fri, 2009-09-25 at 12:22 +0900, Tejun Heo wrote:
> Benjamin Herrenschmidt wrote:
> >> --- Exception: 301 at .memset+0x60/0xfc
> >> LR = .pcpu_alloc+0x718/0x8fc
> >
> > So it's memsetting something that causes it to hash_page(), ie, faulting
> > in pages (vmalloc space ?) so far nothing obviously wrong....
>
> It's probably memset() call near the end of pcpu_populate_chunk()
> where percpu allocator clears the allocated areas before returning to
> user. I don't think the first chunk is causing the problem as they're
> all in the linear mapped area. From the second chunk on, they're on
> vmalloc area and very near to the top of it, so that might be exposing
> a hidden problem in paging code? BTW, for some reason, the problem is
> not reproducible on my powerstation.
That's indeed a possibility, though it would be strange...
Definitely worth looking at your logs, and I'll check with Sachin
about getting on the machine after that if I need to dig more.
Cheers,
Ben.
next prev parent reply other threads:[~2009-09-25 3:41 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-16 12:25 2.6.31-git5 kernel boot hangs on powerpc Sachin Sant
2009-09-16 12:25 ` Sachin Sant
2009-09-17 10:51 ` Sachin Sant
2009-09-17 11:13 ` Benjamin Herrenschmidt
2009-09-17 15:53 ` Tejun Heo
2009-09-17 16:41 ` Sachin Sant
2009-09-19 8:54 ` Sachin Sant
2009-09-23 8:23 ` Sachin Sant
2009-09-23 8:34 ` Tejun Heo
2009-09-23 14:17 ` Tejun Heo
2009-09-24 7:58 ` Sachin Sant
2009-09-24 12:59 ` Tejun Heo
2009-09-24 13:23 ` Sachin Sant
2009-09-24 21:05 ` Benjamin Herrenschmidt
2009-09-25 3:22 ` Tejun Heo
2009-09-25 3:40 ` Benjamin Herrenschmidt [this message]
2009-09-25 7:15 ` Sachin Sant
2009-09-25 7:39 ` Tejun Heo
2009-09-25 7:43 ` Tejun Heo
2009-09-25 8:03 ` Sachin Sant
2009-09-25 9:01 ` Tejun Heo
2009-09-25 9:48 ` Benjamin Herrenschmidt
2009-10-05 6:54 ` Sachin Sant
2009-09-25 8:31 ` Benjamin Herrenschmidt
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