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Date: Wed, 31 Dec 2008 02:01:56 +0900 From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> To: frederik.deweerdt@...og.eu Cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org, kosaki.motohiro@...fujitsu.com, netdev@...r.kernel.org Subject: Re: [2.6.28] NULL pointer dereference at get_stats() Hello. Frederik Deweerdt wrote: > Does adding maxcpus=0 to the boot parameters solve the problem? Stephen > suspected a per-cpu variable related problem. No, but I got interestring results. Result | # of virtual CPUs | Kernel command line -------+-------------------+----------------------------------------- OK | 2 | ro root=LABEL=/ BUG | 2 | ro root=LABEL=/ noapic nolapic BUG | 2 | ro root=LABEL=/ noapic nolapic maxcpus=0 BUG | 2 | ro root=LABEL=/ noapic nolapic nosmp BUG | 2 | ro root=LABEL=/ maxcpus=0 BUG | 2 | ro root=LABEL=/ nosmp OK | 1 | ro root=LABEL=/ OK | 1 | ro root=LABEL=/ nolapic noapic OK | 1 | ro root=LABEL=/ nolapic noapic maxcpus=0 OK | 1 | ro root=LABEL=/ nolapic noapic nosmp "OK" means NULL pointer dereference didn't happen. "BUG" means NULL pointer dereference happened. I was adding "noapic" "nolapic" to command line while assigning 2 vcpus. Thus, I encountered this problem. Workaround is to remove "noapic" "nolapic". Now, it seems to me that this problem is caused by interaction of "noapic" "nolapic" "maxcpus=0" "nosmp" options. Regards. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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