From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753189AbeDJMih (ORCPT ); Tue, 10 Apr 2018 08:38:37 -0400 Received: from mout.gmx.net ([212.227.17.21]:46689 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752846AbeDJMie (ORCPT ); Tue, 10 Apr 2018 08:38:34 -0400 Message-ID: <1523363877.4942.2.camel@gmx.de> Subject: Re: x86-tip.today (4cdf573) early instaboot From: Mike Galbraith To: Ingo Molnar Cc: Ingo Molnar , LKML , Thomas Gleixner , Peter Zijlstra , Dave Hansen Date: Tue, 10 Apr 2018 14:37:57 +0200 In-Reply-To: <20180410085917.bo526ueprf7zfare@gmail.com> References: <1523347959.4724.2.camel@gmx.de> <20180410085917.bo526ueprf7zfare@gmail.com> Content-Type: text/plain; charset="ISO-8859-15" X-Mailer: Evolution 3.22.6 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K1:/BRZYU1/d+t+xUbdt218l12Dye9DeYZe7slrgtH3EGK9FNlBNhB 0rJYiOwpiVXXc/HyMoBpX2Z/VgNjYJtr6MM+GM+KxUiwSTdcHrcjWRhXWGFJSOSVVbR65jA 3XloBKRBkOpUUZe3WiXJoaDLgb0LB4rbmEIh4VU+3cSLIZKy3p11/Li8P6vZ3qMVkVmhVxs QuteG9cJA9BlTJBZEzKWA== X-UI-Out-Filterresults: notjunk:1;V01:K0:YUoKsin8dXg=:HdxKGo5bkCbUrqnttRjOAo kd4jQ11/BvWbtZFKR9BNEhJV9uzrG5De72OOACwHfnbCEJcKITW6r5bz6DSAho23F8lHd4tx5 IGyBlO74w9khW+M3AF4erdMdHCZl45gdmZ+e4/zG4/3jnQHjO5YXSb+5BQhqBh860UM1gtGiO 1o4Kn+y9m8yLn6cFWxf1s54h6o1Vdu0Eh01PjiOhHru/rlEOCQ4hgR2h1IfPUaOY06G30HF/t jHS0oR0Z3L1pPkhHnKiFniggafdzWF4VRN7zxQCnXzHSExSCtyuvqmVBoQpO9aeSH2UfHo+5t JbxRK+8BHaj8UGRx7GhUQd/dqxoN728QHmD8WsdnsdZMaqqOSfPo5WAaKso/sgb4o8nZ6mYxL Uy5AkwydtpEJJEI6Tb4B/SrPRt9MeuAvaxY0b0zne8Y/bT/0VGvFHsdZp1SR8mH0hjhLA0RhB Y/2zOWtBEXmG24Gx2++fAQc9KS3iHI/SakYtDnpvdTePBbX+mTnYOKDJ7d1+JImU0oVvlEpPx lmsawnuCDwmhPuCfa0Su4URoqc8qk15ktSdMP/C//syt3jFlrtYdyO3kG0ywmvTI/u5ptEHiE sXgoZeMECWz/zvysuoxDTzLuZkAOQKp5md4SRqezRWnwKU+yolUG9/fFxcNhfrLCcIA6jlSxj DdqMLm1uMwwxFUFJUB2b2pAG/HLMv8PrDbYd/watQVzJCRyX1bg8c6guAqEi8A8NnmSrK/5Vf bUQRP2UkZSX8rT5JtPMxc896iHnV+NaITL+KL+OaWBFumdgFWw1XrIQMNJQdaDcp4B9gm6x6f jrplRtrXNkEvF/TMzFHUfvEE0Tjqn4b5ONY6LqTnKKsnSGUNng= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2018-04-10 at 10:59 +0200, Ingo Molnar wrote: > * Mike Galbraith wrote: > > > Hi Ingo, > > > > FYI, my i4790 box reboots immediately.. or close enough to it that you > > see nothing at all before again meeting the bios splash. Master with > > the ~same config works fine. I haven't poked around yet (work). > > Hm, so there's been a few 'dangerous' pieces of work merged yesterday-ish. > > Prime suspects would be: > > triton:~/tip> gll linus..x86/pti > > 0564258fb2cf: x86/pti: Leave kernel text global for !PCID > a5df4f1f0d78: x86/pti: Never implicitly clear _PAGE_GLOBAL for kernel image > e0bb456e3250: x86/pti: Enable global pages for shared areas > efad2b415152: x86/mm: Do not forbid _PAGE_RW before init for __ro_after_init > 4ddee6efdcd0: x86/mm: Comment _PAGE_GLOBAL mystery > e71e836f463d: x86/mm: Remove extra filtering in pageattr code > 64c80759408f: x86/mm: Do not auto-massage page protections <== WOOF > 6baf4bec02db: x86/espfix: Document use of _PAGE_GLOBAL > 8a57f4849f4f: x86/mm: Introduce "default" kernel PTE mask > 606c7193d5fb: x86/mm: Undo double _PAGE_PSE clearing > d1440b23c922: x86/mm: Factor out pageattr _PAGE_GLOBAL setting > ee1400dda318: Merge branch 'linus' into x86/pti to pick up upstream changes > 071ccc966ba5: x86/entry/64: Drop idtentry's manual stack switch for user entries > 9820e1c3376c: x86/uapi: Fix asm/bootparam.h userspace compilation errors > > ... which you could test via 0564258fb2cf: if that insta-reboots too then > 9820e1c3376c^1 is expected to work and 4 bisection steps should pinpoint the > guilty commit ... Thanks. I already had a full bisect running, so ended up doing more than 4 steps, but ended up at the above. -Mike