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

From Thomas Gleixner <tglx@linutronix.de>
Newsgroups linux.kernel
Subject Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request at 0000a7cf
Date 2017-03-09 14:20 +0100
Message-ID <tj693-5FN-5@gated-at.bofh.it> (permalink)
References (4 earlier) <tiSfL-4qJ-7@gated-at.bofh.it> <tiSps-4tU-13@gated-at.bofh.it> <tiU7T-5GA-5@gated-at.bofh.it> <tiYXT-xV-1@gated-at.bofh.it> <tj5Zp-5Ce-49@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Thu, 9 Mar 2017, Daniel Borkmann wrote:
> With regard to CPA_FLUSHTLB that Linus mentioned, when I investigated
> code paths in change_page_attr_set_clr(), I did see that CPA_FLUSHTLB
> was set each time we switched attrs and a cpa_flush_range() was
> performed (with the correct number of pages and cache set to 0). That
> would be a __flush_tlb_all() eventually.
> 
> Hmm, it indeed might seem likely that this could be an emulation bug.

Which variant of __flush_tlb_all() is used when the test fails?

Check for the following flags in /proc/cpuinfo: pge invpcid

Thanks,

	tglx

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Thread

Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Fengguang Wu <fengguang.wu@intel.com> - 2017-03-02 21:30 +0100
  Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-02 22:40 +0100
    Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-08 20:30 +0100
      Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Kees Cook <keescook@chromium.org> - 2017-03-08 23:40 +0100
        Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 00:20 +0100
        Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Laura Abbott <labbott@redhat.com> - 2017-03-09 01:30 +0100
          Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Kees Cook <keescook@chromium.org> - 2017-03-09 06:40 +0100
            Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 14:10 +0100
              Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Thomas Gleixner <tglx@linutronix.de> - 2017-03-09 14:20 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 15:10 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Thomas Gleixner <tglx@linutronix.de> - 2017-03-09 16:00 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 19:00 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging  request at 0000a7cf David Miller <davem@davemloft.net> - 2017-03-09 19:10 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-09 19:20 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-09 19:20 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 19:40 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 22:40 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Borislav Petkov <bp@suse.de> - 2017-03-09 23:10 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 23:20 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Borislav Petkov <bp@suse.de> - 2017-03-09 23:50 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-10 00:30 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Borislav Petkov <bp@suse.de> - 2017-03-10 00:50 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-10 01:20 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Borislav Petkov <bp@suse.de> - 2017-03-12 22:50 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Borislav Petkov <bp@suse.de> - 2017-03-09 23:20 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Daniel Borkmann <daniel@iogearbox.net> - 2017-03-09 16:00 +0100
                Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-09 18:50 +0100
      Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-08 23:50 +0100
        Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Fengguang Wu <fengguang.wu@intel.com> - 2017-03-09 02:40 +0100
      Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request  at 0000a7cf Thomas Gleixner <tglx@linutronix.de> - 2017-03-09 14:50 +0100

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