linux-kernel - Re: [2.6.28] NULL pointer dereference at get

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Date:	Wed, 31 Dec 2008 14:09:19 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	frederik.deweerdt@...og.eu
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, kosaki.motohiro@...fujitsu.com
Subject: Re: [2.6.28] NULL pointer dereference at get_stats()

Hello.

Frederik Deweerdt wrote:
> Thanks for the thourough testing. I've reviewed the code, and the only
> think that looks weird to me is the case where smp_sanity_check() fails.
> The attached patch is an attempt to correct this, Tetsuo, could you
> test it?
That patch didn't solve.

Below are the results (with that patch applied) with more test cases.

Case | Result | # of virtual CPUs | # of CPUs recognized | Kernel command line
-----+--------+-------------------+----------------------+-----------------------------------------
(1)  | OK     | 2                 | 2                    | ro root=LABEL=/
(2)  | BUG    | 2                 | 1                    | ro root=LABEL=/ noapic nolapic
(3)  | BUG    | 2                 | 1                    | ro root=LABEL=/ noapic nolapic maxcpus=0
(4)  | BUG    | 2                 | 1                    | ro root=LABEL=/ noapic nolapic nosmp
(5)  | BUG    | 2                 | 1                    | ro root=LABEL=/ maxcpus=0
(6)  | BUG    | 2                 | 1                    | ro root=LABEL=/ nosmp
(7)  | OK     | 1                 | 1                    | ro root=LABEL=/
(8)  | OK     | 1                 | 1                    | ro root=LABEL=/ nolapic noapic
(9)  | OK     | 1                 | 1                    | ro root=LABEL=/ nolapic noapic maxcpus=0
(10) | OK     | 1                 | 1                    | ro root=LABEL=/ nolapic noapic nosmp
(11) | OK     | 2                 | 1                    | ro root=LABEL=/ maxcpus=1
(12) | OK     | 2                 | 2                    | ro root=LABEL=/ maxcpus=2
(13) | OK     | 2                 | 2                    | ro root=LABEL=/ maxcpus=4
(14) | BUG    | 2                 | 1                    | ro root=LABEL=/ noapic nolapic maxcpus=1
(15) | OK     | 2                 | 2                    | ro root=LABEL=/ noapic
(16) | BUG    | 2                 | 1                    | ro root=LABEL=/ noapic maxcpus=0
(17) | OK     | 2                 | 1                    | ro root=LABEL=/ noapic maxcpus=1
(18) | OK     | 2                 | 2                    | ro root=LABEL=/ noapic maxcpus=2
(19) | BUG    | 2                 | 1                    | ro root=LABEL=/ nolapic
(20) | BUG    | 2                 | 1                    | ro root=LABEL=/ nolapic maxcpus=0
(21) | BUG    | 2                 | 1                    | ro root=LABEL=/ nolapic maxcpus=1
(22) | BUG    | 2                 | 1                    | ro root=LABEL=/ nolapic maxcpus=2

"# of CPUs recognized" means "grep -c ^processor /proc/cpcinfo".

Well, (2) (19) (22) are obviously wrong. "nolapic" option implies "nosmp" option?

Regards.
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