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Message-ID: <5a283bd9.ookXe3fjnygkI87S%fengguang.wu@intel.com>
Date: Thu, 07 Dec 2017 02:50:01 +0800
From: kernel test robot <fengguang.wu@...el.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKP <lkp@...org>, linux-kernel@...r.kernel.org,
Ingo Molnar <mingo@...nel.org>, wfg@...ux.intel.com
Subject: 264d55b5c0 ("x86/fixmap: Add LDT entries to user-shared fixmap"): BUG: kernel hang in early-boot stage, last printk: early console in setup code
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/pti
commit 264d55b5c0a75bd12486d5afd24922ae743ed4a2
Author: Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Mon Dec 4 15:07:51 2017 +0100
Commit: Ingo Molnar <mingo@...nel.org>
CommitDate: Tue Dec 5 15:31:27 2017 +0100
x86/fixmap: Add LDT entries to user-shared fixmap
LDT entries need to be user visible. Add them to the user shared fixmaps so
they can be mapped to the actual location of the LDT entries of a process
on task switch.
Populate the PTEs upfront so the PMD sharing works.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Borislav Petkov <bpetkov@...e.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: David Laight <David.Laight@...lab.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Eduardo Valentin <eduval@...zon.com>
Cc: Greg KH <gregkh@...uxfoundation.org>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Juergen Gross <jgross@...e.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Will Deacon <will.deacon@....com>
Cc: aliguori@...zon.com
Cc: daniel.gruss@...k.tugraz.at
Cc: hughd@...gle.com
Cc: keescook@...gle.com
Link: https://lkml.kernel.org/r/20171204150608.517089374@linutronix.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
90d2be4c25 x86/events/intel/ds: Map debug buffers in fixmap
264d55b5c0 x86/fixmap: Add LDT entries to user-shared fixmap
16db81a1bf x86/pti: Add temporary workaround for the fixmap sizing bug
140ce6a343 Merge branch 'perf/core'
+-----------------------------------------------------------------------------+------------+------------+------------+------------+
| | 90d2be4c25 | 264d55b5c0 | 16db81a1bf | 140ce6a343 |
+-----------------------------------------------------------------------------+------------+------------+------------+------------+
| boot_successes | 53 | 0 | 0 | 0 |
| boot_failures | 0 | 33 | 42 | 11 |
| BUG:kernel_hang_in_early-boot_stage,last_printk:early_console_in_setup_code | 0 | 33 | 42 | 11 |
+-----------------------------------------------------------------------------+------------+------------+------------+------------+
early console in setup code
BUG: kernel hang in early-boot stage, last printk: early console in setup code
Linux version 4.14.0-00111-g264d55b #73
Command line: root=/dev/ram0 hung_task_panic=1 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 net.ifnames=0 printk.devkmsg=on panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 drbd.minor_count=8 systemd.log_level=err ignore_loglevel console=tty0 earlyprintk=ttyS0,115200 console=ttyS0,115200 vga=normal rw link=/kbuild-tests/run-queue/kvm/x86_64-randconfig-i0-201749/tip:WIP.x86:pti.merge:264d55b5c0a75bd12486d5afd24922ae743ed4a2:bisect-linux-21/.vmlinuz-264d55b5c0a75bd12486d5afd24922ae743ed4a2-20171206231546-1:quantal-ivb41-20 branch=tip/WIP.x86/pti.merge BOOT_IMAGE=/pkg/linux/x86_64-randconfig-i0-201749/gcc-7/264d55b5c0a75bd12486d5afd24922ae743ed4a2/vmlinuz-4.14.0-00111-g264d55b drbd.minor_count=8
# HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD
git bisect start 071cfb3fcc193e07e722c82a12dfec42917aa55b 55d2d0ad2fb4325f615d1950486fbc5e6fba1769 --
git bisect good 5b06bbcfc2c621da3009da8decb7511500c293ed # 21:44 G 10 0 10 18 x86/power: Fix some ordering bugs in __restore_processor_context()
git bisect good e0eb372a4f40ff7a39d427df659c7345b1f6c178 # 22:04 G 11 0 11 12 Merge branch 'linus' into WIP.x86/pti.merge, to merge in v4.15 changes
git bisect bad cecf6d11c26824409816cd34b106141664b7df73 # 22:27 B 0 2 16 0 Merge branch 'WIP.x86/pti' into WIP.x86/pti.merge
git bisect good 8b680f8c6b286f50426f2f8b3032ab8539feb2e5 # 22:55 G 11 0 0 0 x86/mm/pti: Add infrastructure for page table isolation
git bisect bad 264d55b5c0a75bd12486d5afd24922ae743ed4a2 # 23:26 B 0 3 23 6 x86/fixmap: Add LDT entries to user-shared fixmap
git bisect good 979afcdb4bbf77e76f15c26cf74985e3982235cf # 23:54 G 11 0 0 0 x86/mm/pti: Force entry through trampoline when PTI active
git bisect good 22978db78a2775a3e1559ef684b027ccd46f8a0d # 00:27 G 11 0 0 0 x86/mm/pti: Share entry text PMD
git bisect good 2ffe493f94b7163a987fc6252e53d64b7aac9373 # 00:49 G 10 0 0 0 x86/fixmap: Add debugstore entries to cpu_entry_area
git bisect good 90d2be4c258456ec1784e92afee9de013c2ac566 # 01:05 G 11 0 0 0 x86/events/intel/ds: Map debug buffers in fixmap
# first bad commit: [264d55b5c0a75bd12486d5afd24922ae743ed4a2] x86/fixmap: Add LDT entries to user-shared fixmap
git bisect good 90d2be4c258456ec1784e92afee9de013c2ac566 # 01:13 G 31 0 0 0 x86/events/intel/ds: Map debug buffers in fixmap
# extra tests with debug options
git bisect bad 264d55b5c0a75bd12486d5afd24922ae743ed4a2 # 01:28 B 0 9 23 0 x86/fixmap: Add LDT entries to user-shared fixmap
# extra tests on HEAD of tip/WIP.x86/pti.merge
git bisect bad 071cfb3fcc193e07e722c82a12dfec42917aa55b # 01:28 B 0 13 30 0 x86/pti: Remove GFP_NOTRACK use
# extra tests on tree/branch tip/WIP.x86/pti
git bisect bad 16db81a1bfe0974b6ed3ed102150e23449ab0c7f # 01:55 B 0 2 19 3 x86/pti: Add temporary workaround for the fixmap sizing bug
# extra tests with first bad commit reverted
git bisect good 3ee67d141104a7a387abfabbb8840cd020c1bd9a # 02:22 G 11 0 0 0 Revert "x86/fixmap: Add LDT entries to user-shared fixmap"
# extra tests on tree/branch tip/master
git bisect bad 140ce6a343f6b5fff01f1fcc4984598390e49571 # 02:43 B 0 4 18 0 Merge branch 'perf/core'
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/lkp Intel Corporation
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