From: Dan Aloni <dan@kernelim.com>
To: Sasha Levin <sasha.levin@oracle.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
Dave Jones <davej@redhat.com>
Subject: Re: mm/sched/net: BUG when running simple code
Date: Fri, 13 Jun 2014 08:26:30 +0300 [thread overview]
Message-ID: <20140613052630.GA23945@gmail.com> (raw)
In-Reply-To: <20140613045555.GB20729@gmail.com>
On Fri, Jun 13, 2014 at 07:55:55AM +0300, Dan Aloni wrote:
> > that theory went away. (also confirmed by not finding a netlink module.)
> >
> > What about the kernel .text overflowing into the modules space? The loader
> > checks for that, but can something like that happen after everything is
> > up and running? I'll look into that tomorrow.
>
> The kernel .text needs to be more than 512MB for the overlap to happen.
>
> ffffffff80000000 - ffffffffa0000000 (=512 MB) kernel text mapping, from phys 0
>
> Also, it is bizarre that symbol resolution resolved ffffffffa0f12560 to
> a symbol that is in module space where af_netlink.o is surely not because of
> "obj-y := af_netlink.o" in the Makefile.
>
> What does your /proc/kallsyms show when sorted with regards to the symbols
> in question?
>
> Also curious are the addresses you have on the stack:
>
> > [ 516.309720] Stack:
> > [ 516.309720] ffff8803fc85ff18 ffff8803fc85ff18 ffff8803fc85fef8 8900200549908020
> > [ 516.309720] ffff8803fc85ff18 ffffffff9ff66470 ffff8803fc85ff18 0000000000000037
> > [ 516.309720] ffff8803fc85ff78 ffffffff9ff69d26 0000000000000037 0000000000000004
>[..]
Oh, just figured about the new kASLR feature that got enabled
recently, it explains the addresses, but there was supposed to be a
line for it in the Oops, so I'm puzzled.
--
Dan Aloni
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next prev parent reply other threads:[~2014-06-13 5:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-13 2:56 mm/sched/net: BUG when running simple code Sasha Levin
2014-06-13 3:27 ` Dan Aloni
2014-06-13 4:01 ` Sasha Levin
2014-06-13 4:13 ` Dave Jones
2014-06-13 15:13 ` Sasha Levin
2014-06-17 3:17 ` Sasha Levin
2014-06-17 4:30 ` Dan Aloni
2014-06-13 4:55 ` Dan Aloni
2014-06-13 5:26 ` Dan Aloni [this message]
2014-06-13 5:31 ` Dan Aloni
2014-07-08 14:51 ` Peter Zijlstra
2014-07-08 15:25 ` Sasha Levin
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