From: Andy Lutomirski <luto@amacapital.net> To: Benjamin Gilbert <benjamin.gilbert@coreos.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, stable@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@kernel.org>, Andy Lutomirski <luto@kernel.org>, Dave Hansen <dave.hansen@linux.intel.com>, Peter Zijlstra <peterz@infradead.org> Subject: Re: "bad pmd" errors + oops with KPTI on 4.14.11 after loading X.509 certs Date: Wed, 3 Jan 2018 16:37:53 -0800 [thread overview] Message-ID: <DE0BC12C-4BA8-46AF-BD90-6904B9F87187@amacapital.net> (raw) In-Reply-To: <20180104003303.GA1654@trogon.sfo.coreos.systems> > On Jan 3, 2018, at 4:33 PM, Benjamin Gilbert <benjamin.gilbert@coreos.com> wrote: > >> On Wed, Jan 03, 2018 at 10:20:16AM +0100, Greg Kroah-Hartman wrote: >> Ick, not good, any chance you can test 4.15-rc6 to verify that the issue >> is also there (or not)? > > I haven't been able to reproduce this on 4.15-rc6. Ah. Maybe try rebuilding a bad kernel with free_ldt_pgtables() modified to do nothing, and the read /sys/kernel/debug/page_tables/current (or current_kernel, or whatever it's called). The problem may be obvious. > > --Benjamin Gilbert
WARNING: multiple messages have this Message-ID (diff)
From: Andy Lutomirski <luto@amacapital.net> To: Benjamin Gilbert <benjamin.gilbert@coreos.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, stable@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@kernel.org>, Andy Lutomirski <luto@kernel.org>, Dave Hansen <dave.hansen@linux.intel.com>, Peter Zijlstra <peterz@infradead.org> Subject: Re: "bad pmd" errors + oops with KPTI on 4.14.11 after loading X.509 certs Date: Wed, 3 Jan 2018 16:37:53 -0800 [thread overview] Message-ID: <DE0BC12C-4BA8-46AF-BD90-6904B9F87187@amacapital.net> (raw) In-Reply-To: <20180104003303.GA1654@trogon.sfo.coreos.systems> > On Jan 3, 2018, at 4:33 PM, Benjamin Gilbert <benjamin.gilbert@coreos.com> wrote: > >> On Wed, Jan 03, 2018 at 10:20:16AM +0100, Greg Kroah-Hartman wrote: >> Ick, not good, any chance you can test 4.15-rc6 to verify that the issue >> is also there (or not)? > > I haven't been able to reproduce this on 4.15-rc6. Ah. Maybe try rebuilding a bad kernel with free_ldt_pgtables() modified to do nothing, and the read /sys/kernel/debug/page_tables/current (or current_kernel, or whatever it's called). The problem may be obvious. > > --Benjamin Gilbert -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2018-01-04 0:37 UTC|newest] Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-01-03 8:36 "bad pmd" errors + oops with KPTI on 4.14.11 after loading X.509 certs Benjamin Gilbert 2018-01-03 8:46 ` Benjamin Gilbert 2018-01-03 9:20 ` Greg Kroah-Hartman 2018-01-03 9:20 ` Greg Kroah-Hartman 2018-01-03 15:48 ` Ingo Molnar 2018-01-03 15:48 ` Ingo Molnar 2018-01-03 22:32 ` Benjamin Gilbert 2018-01-03 22:32 ` Benjamin Gilbert 2018-01-03 22:34 ` Thomas Gleixner 2018-01-03 22:34 ` Thomas Gleixner 2018-01-03 22:49 ` Benjamin Gilbert 2018-01-03 22:57 ` Thomas Gleixner 2018-01-03 22:57 ` Thomas Gleixner 2018-01-03 22:58 ` Thomas Gleixner 2018-01-03 22:58 ` Thomas Gleixner 2018-01-03 23:44 ` Andy Lutomirski 2018-01-03 23:44 ` Andy Lutomirski 2018-01-03 23:46 ` Thomas Gleixner 2018-01-03 23:46 ` Thomas Gleixner 2018-01-04 0:27 ` Andy Lutomirski 2018-01-04 0:27 ` Andy Lutomirski 2018-01-04 0:38 ` Benjamin Gilbert 2018-01-04 0:38 ` Benjamin Gilbert 2018-01-04 0:33 ` Benjamin Gilbert 2018-01-04 0:33 ` Benjamin Gilbert 2018-01-04 0:37 ` Thomas Gleixner 2018-01-04 0:37 ` Thomas Gleixner 2018-01-04 7:14 ` Ingo Molnar 2018-01-04 7:14 ` Ingo Molnar 2018-01-04 7:18 ` Greg Kroah-Hartman 2018-01-04 7:18 ` Greg Kroah-Hartman 2018-01-04 7:20 ` Ingo Molnar 2018-01-04 7:20 ` Ingo Molnar 2018-01-04 8:03 ` Greg Kroah-Hartman 2018-01-04 8:03 ` Greg Kroah-Hartman 2018-01-04 7:22 ` Ingo Molnar 2018-01-04 7:22 ` Ingo Molnar 2018-01-04 0:37 ` Andy Lutomirski [this message] 2018-01-04 0:37 ` Andy Lutomirski 2018-01-04 4:35 ` Benjamin Gilbert 2018-01-04 4:45 ` Andy Lutomirski 2018-01-04 4:45 ` Andy Lutomirski 2018-01-04 12:28 ` Thomas Gleixner 2018-01-04 12:28 ` Thomas Gleixner 2018-01-04 16:17 ` Andy Lutomirski 2018-01-04 16:17 ` Andy Lutomirski 2018-01-04 16:34 ` Thomas Gleixner 2018-01-04 16:34 ` Thomas Gleixner 2018-01-04 19:38 ` Benjamin Gilbert 2018-01-04 19:38 ` Benjamin Gilbert 2018-01-04 22:10 ` [tip:x86/pti] x86/mm: Map cpu_entry_area at the same place on 4/5 level tip-bot for Thomas Gleixner 2018-01-04 22:10 ` [tip:x86/pti] x86/kaslr: Fix the vaddr_end mess tip-bot for Thomas Gleixner 2018-01-04 23:29 ` Benjamin Gilbert 2018-01-04 23:32 ` Thomas Gleixner 2018-01-04 23:48 ` tip-bot for Thomas Gleixner 2018-01-04 1:37 ` "bad pmd" errors + oops with KPTI on 4.14.11 after loading X.509 certs Benjamin Gilbert 2018-01-04 1:37 ` Benjamin Gilbert 2018-01-04 4:36 ` Benjamin Gilbert 2018-01-04 4:36 ` Benjamin Gilbert
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