linux-kernel - c88d71508e ("x86/boot/64: Rewrite startup_64() in C"): BUG: kernel reboot-without-warning in early-boot stage, last printk: Booting the kernel.

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Date:   Thu, 15 Jun 2017 00:10:58 +0800
From:   kernel test robot <fengguang.wu@...el.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     LKP <lkp@...org>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>, wfg@...ux.intel.com
Subject: c88d71508e ("x86/boot/64: Rewrite startup_64() in C"): BUG:
 kernel reboot-without-warning in early-boot stage, last printk: Booting the kernel.

Greetings,

0day kernel testing robot got the below dmesg and the first bad commit is

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master

commit c88d71508e36b514413464bd2e01f96f34583a0e
Author:     Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
AuthorDate: Tue Jun 6 14:31:26 2017 +0300
Commit:     Ingo Molnar <mingo@...nel.org>
CommitDate: Tue Jun 13 08:56:54 2017 +0200

    x86/boot/64: Rewrite startup_64() in C
    
    The patch write most of startup_64 logic in C.
    
    This is preparation for 5-level paging enabling.
    
    Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
    Cc: Andrew Morton <akpm@...ux-foundation.org>
    Cc: Andy Lutomirski <luto@...capital.net>
    Cc: Andy Lutomirski <luto@...nel.org>
    Cc: Borislav Petkov <bp@...en8.de>
    Cc: Brian Gerst <brgerst@...il.com>
    Cc: Dave Hansen <dave.hansen@...el.com>
    Cc: Denys Vlasenko <dvlasenk@...hat.com>
    Cc: H. Peter Anvin <hpa@...or.com>
    Cc: Josh Poimboeuf <jpoimboe@...hat.com>
    Cc: Linus Torvalds <torvalds@...ux-foundation.org>
    Cc: Peter Zijlstra <peterz@...radead.org>
    Cc: Thomas Gleixner <tglx@...utronix.de>
    Cc: linux-arch@...r.kernel.org
    Cc: linux-mm@...ck.org
    Link: http://lkml.kernel.org/r/20170606113133.22974-8-kirill.shutemov@linux.intel.com
    Signed-off-by: Ingo Molnar <mingo@...nel.org>

34bbb0009f  x86/boot/compressed: Enable 5-level paging during decompression stage
c88d71508e  x86/boot/64: Rewrite startup_64() in C
b14746170b  Add linux-next specific files for 20170614
+--------------------------------------------------------------------------------------+------------+------------+---------------+
|                                                                                      | 34bbb0009f | c88d71508e | next-20170614 |
+--------------------------------------------------------------------------------------+------------+------------+---------------+
| boot_successes                                                                       | 37         | 0          | 2             |
| boot_failures                                                                        | 0          | 13         | 29            |
| BUG:kernel_reboot-without-warning_in_early-boot_stage,last_printk:Booting_the_kernel | 0          | 13         | 26            |
| BUG:kernel_reboot-without-warning_in_boot_stage                                      | 0          | 0          | 2             |
| BUG:kernel_hang_in_test_stage                                                        | 0          | 0          | 1             |
+--------------------------------------------------------------------------------------+------------+------------+---------------+


Decompressing Linux... Parsing ELF... done.
Booting the kernel.


                                                          # HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD
git bisect start b14746170b0684005bab3e07893e6b91baf7dbf6 32c1431eea4881a6b17bd7c639315010aeefa452 --
git bisect good b61f724738081d6118d496b21aad6c6c0aec455c  # 20:24  G     11     0    0   0  Merge remote-tracking branch 'wireless-drivers-next/master'
git bisect  bad 7d61b28399518f2c532d25f128c617f3090fe07f  # 20:37  B      0    11   24   1  Merge remote-tracking branch 'edac-amd/for-next'
git bisect good efb87a591f25a455cb8f5792d31667d04ef98911  # 20:54  G     11     0    0   0  Merge remote-tracking branch 'device-mapper/for-next'
git bisect good 4e98e25c8cf9b9930aac06abeb2b4044525e7de8  # 21:04  G     11     0    0   0  Merge remote-tracking branch 'keys/keys-next'
git bisect good f6a5e2bdaaecf8372d8909e1bf151b82f2594942  # 21:13  G     11     0    0   0  Merge remote-tracking branch 'vfio/next'
git bisect good bd48556cac717369b1ccf43fd7582e4b1f90b791  # 21:24  G     11     0    0   0  Merge remote-tracking branch 'spi/for-next'
git bisect  bad 4717c17660509cee9d3596eb19b99f3e26d57c36  # 21:37  B      0     7   20   1  Merge remote-tracking branch 'tip/auto-latest'
git bisect good 1e9e7205fc4396c4b4bfec508b2d618e4526b625  # 21:56  G     11     0    0   0  Merge branch 'ras/core'
git bisect good 33226e814cccbdcd02b11979f7291efdaf996269  # 22:13  G     11     0    0   0  Merge branch 'smp/hotplug'
git bisect good f47786d3ecec234369c52101d7312a2c468a4c60  # 22:29  G     11     0    0   0  Merge branch 'timers/nohz'
git bisect  bad 65ade2f872b474fa8a04c2d397783350326634e6  # 22:37  B      0    11   23   0  x86/boot/64: Rename init_level4_pgt and early_level4_pgt
git bisect good d6e41f1151feeb118eee776c09323aceb4a415d9  # 23:06  G     11     0    0   0  x86/mm, KVM: Teach KVM's VMX code that CR3 isn't a constant
git bisect good cbe0317bf10acf1f41811108ed0f9a316103c0f3  # 23:14  G     11     0    0   0  x86/asm: Fix comment in return_from_SYSCALL_64()
git bisect good 919a02d1280a3845bac70e6b7891ca070f21a60a  # 23:32  G     11     0    0   0  x86/boot/efi: Define __KERNEL32_CS GDT on 64-bit configurations
git bisect  bad c88d71508e36b514413464bd2e01f96f34583a0e  # 23:40  B      0    11   23   0  x86/boot/64: Rewrite startup_64() in C
git bisect good 34bbb0009f3b7a5eef1ab34f14e5dbf7b8fc389c  # 23:54  G     10     0    0   0  x86/boot/compressed: Enable 5-level paging during decompression stage
# first bad commit: [c88d71508e36b514413464bd2e01f96f34583a0e] x86/boot/64: Rewrite startup_64() in C
git bisect good 34bbb0009f3b7a5eef1ab34f14e5dbf7b8fc389c  # 23:58  G     33     0    0   0  x86/boot/compressed: Enable 5-level paging during decompression stage
# extra tests with CONFIG_DEBUG_INFO_REDUCED
git bisect  bad c88d71508e36b514413464bd2e01f96f34583a0e  # 00:09  B      0    11   24   1  x86/boot/64: Rewrite startup_64() in C
# extra tests on HEAD of linux-next/master
git bisect  bad b14746170b0684005bab3e07893e6b91baf7dbf6  # 00:10  B      0    26   45   3  Add linux-next specific files for 20170614
# extra tests on tree/branch linux-next/master
git bisect  bad b14746170b0684005bab3e07893e6b91baf7dbf6  # 00:10  B      0    26   45   3  Add linux-next specific files for 20170614

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/lkp                          Intel Corporation

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