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Date: Thu, 9 Mar 2017 10:15:22 -0800 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Daniel Borkmann <daniel@...earbox.net> Cc: 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 9, 2017 at 10:10 AM, Linus Torvalds <torvalds@...ux-foundation.org> wrote: > > Very odd. We should always have PGE (0x0080) set in cr4 (if the CPU > supports it). Daniel, do you see the code in probe_page_size_mask() triggering? /* Enable PGE if available */ if (boot_cpu_has(X86_FEATURE_PGE)) { cr4_set_bits_and_update_boot(X86_CR4_PGE); __supported_pte_mask |= _PAGE_GLOBAL; } else __supported_pte_mask &= ~_PAGE_GLOBAL; but maybe there's something wrong with the percpu cr4 caching? Linus
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