Re: mm/sched/net: BUG when running simple code

[Dan Aloni]

On Thu, Jun 12, 2014 at 10:56:16PM -0400, Sasha Levin wrote:
> Hi all,
> 
> Okay, I'm really lost. I got the following when fuzzing, and can't really explain what's
> going on. It seems that we get a "unable to handle kernel paging request" when running
> rather simple code, and I can't figure out how it would cause it.
[..]
> Which agrees with the trace I got:
> 
> [  516.309720] BUG: unable to handle kernel paging request at ffffffffa0f12560
> [  516.309720] IP: netlink_getsockopt (net/netlink/af_netlink.c:2271)
[..]
> [  516.309720] RIP netlink_getsockopt (net/netlink/af_netlink.c:2271)
> [  516.309720]  RSP <ffff8803fc85fed8>
> [  516.309720] CR2: ffffffffa0f12560
> 
> They only theory I had so far is that netlink is a module, and has gone away while the code
> was executing, but netlink isn't a module on my kernel.

The RIP - 0xffffffffa0f12560 is in the range (from Documentation/x86/x86_64/mm.txt):

    ffffffffa0000000 - ffffffffff5fffff (=1525 MB) module mapping space

So seems it was in a module.

-- 
Dan Aloni
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