linux-kernel - Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request at 0000a7cf

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Message-ID: <20170309215547.jmdzznlkzaxwu2pf@pd.tnic>
Date:   Thu, 9 Mar 2017 22:55:47 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, Peter Anvin <hpa@...or.com>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Network Development <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, LKP <lkp@...org>,
        ast@...com, the arch/x86 maintainers <x86@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request
 at 0000a7cf

On Thu, Mar 09, 2017 at 10:32:12PM +0100, Daniel Borkmann wrote:
> 	get_online_cpus();
> 	if (boot_cpu_has(X86_FEATURE_PGE)) { /* We have a broader idea of "global". */
> 		/* Remember that this was originally set (for cleanup). */
> 		cpu_had_pge = 1;
> 		/*
> 		 * adjust_pge is a helper function which sets or unsets the PGE
> 		 * bit on its CPU, depending on the argument (0 == unset).
> 		 */
> 		on_each_cpu(adjust_pge, (void *)0, 1);
> 		/* Turn off the feature in the global feature set. */
> 		clear_cpu_cap(&boot_cpu_data, X86_FEATURE_PGE);

Can you make that:

	setup_clear_cpu_cap(X86_FEATURE_PGE);

and see if it fixes your issue?

Thanks.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--