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Date:   Thu, 31 Aug 2017 06:52:15 +0800
From:   kernel test robot <fengguang.wu@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     LKP <lkp@...org>, linux-kernel@...r.kernel.org, wfg@...ux.intel.com
Subject: d5923ebd7c ("Merge branch 'WIP.x86/fpu'"): BUG: kernel hang 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/tip/tip.git master

commit d5923ebd7cd211e5925383296723b0fab857afe4
Merge: 11b1743a0d92d 6061efb6ee6fc
Author:     Ingo Molnar <mingo@...nel.org>
AuthorDate: Tue Aug 29 16:19:54 2017 +0200
Commit:     Ingo Molnar <mingo@...nel.org>
CommitDate: Tue Aug 29 16:19:54 2017 +0200

    Merge branch 'WIP.x86/fpu'
    
     Conflicts:
            drivers/lguest/x86/core.c

11b1743a0d  Merge branch 'x86/urgent'
6061efb6ee  x86/fpu: Turn WARN_ON() in context switch into WARN_ON_FPU()
d5923ebd7c  Merge branch 'WIP.x86/fpu'
152d54a2bc  Merge branch 'x86/asm'
+--------------------------------------------------------------------+------------+------------+------------+------------+
|                                                                    | 11b1743a0d | 6061efb6ee | d5923ebd7c | 152d54a2bc |
+--------------------------------------------------------------------+------------+------------+------------+------------+
| boot_successes                                                     | 32         | 27         | 0          | 0          |
| boot_failures                                                      | 11         | 6          | 15         | 6          |
| BUG:kernel_reboot-without-warning_in_boot_stage                    | 11         | 1          |            |            |
| BUG:kernel_in_stage                                                | 0          | 4          |            |            |
| BUG:kernel_reboot-without-warning_in_test_stage                    | 0          | 1          |            |            |
| BUG:kernel_hang_in_early-boot_stage,last_printk:Booting_the_kernel | 0          | 0          | 15         | 6          |
+--------------------------------------------------------------------+------------+------------+------------+------------+


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


                                                          # HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD
git bisect start 7fa01c90f24ce7850460f4bef4905dacc66d07d0 cc4a41fe5541a73019a864883297bd5043aa6d98 --
git bisect  bad 0c05f7489b656f738c2a8a26685223d166ebea6b  # 01:33  B      0    11   24   0  Merge 'asoc/topic/rockchip' into devel-catchup-201708310002
git bisect  bad a098a7e85504b2634974500375d04266cd0b2f94  # 01:56  B      0    11   24   0  Merge 'dledford/k.o/for-next' into devel-catchup-201708310002
git bisect  bad 4fd60aafa624e670b48dbb98dde25d78368b4c17  # 02:14  B      0    11   24   0  Merge 'tip/master' into devel-catchup-201708310002
git bisect good 3b62a63dba4c234497d87fbbee2e29da133505a9  # 02:28  G     10     0   10  10  0day base guard for 'devel-catchup-201708310002'
git bisect good 1b2f76d77a277bb70d38ad0991ed7f16bbc115a9  # 02:53  G     11     0    2   2  Merge tag 'perf-core-for-mingo-4.14-20170829' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core
git bisect good 8ea7c2d9a971f95ec9f6ffac60cb4847d35f0b36  # 03:10  G     11     0   11  11  manual merge of locking/core
git bisect good 9eb6b9d19b85c30162779d33725da23dc317845d  # 03:27  G     11     0    3   3  Merge branch 'x86/asm'
git bisect good 64e82b58b54d38753763c329c43d0828e1231397  # 03:46  G     11     0    2   2  Merge branch 'x86/mm'
git bisect good 6061efb6ee6fc891498a23994a4d0a5e2a52c059  # 04:05  G     11     0    1   1  x86/fpu: Turn WARN_ON() in context switch into WARN_ON_FPU()
git bisect good 9e1240d649e55e314aa3df28d552a1f19932963b  # 04:22  G     11     0    2   6  Merge branch 'x86/syscall'
git bisect good 36fde05f3fb51edea879636db590d70e11f16c82  # 04:43  G     11     0   11  11  Merge branch 'for-4.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
git bisect  bad d5923ebd7cd211e5925383296723b0fab857afe4  # 05:02  B      0     5   18   0  Merge branch 'WIP.x86/fpu'
git bisect good 5746f0555d00e1cbb7bc20a2fd09041ace6f350c  # 05:23  G     11     0   11  11  x86/boot: Provide more slack space during decompression
git bisect good 11b1743a0d92d501e762d1cbd8de3af91d22a064  # 05:47  G     11     0    9  11  Merge branch 'x86/urgent'
# first bad commit: [d5923ebd7cd211e5925383296723b0fab857afe4] Merge branch 'WIP.x86/fpu'
git bisect good 11b1743a0d92d501e762d1cbd8de3af91d22a064  # 05:57  G     32     0    0  11  Merge branch 'x86/urgent'
git bisect good 6061efb6ee6fc891498a23994a4d0a5e2a52c059  # 06:27  G     32     0    5   6  x86/fpu: Turn WARN_ON() in context switch into WARN_ON_FPU()
# extra tests with CONFIG_DEBUG_INFO_REDUCED
git bisect  bad d5923ebd7cd211e5925383296723b0fab857afe4  # 06:43  B      0     8   22   0  Merge branch 'WIP.x86/fpu'
# extra tests on HEAD of linux-devel/devel-catchup-201708310002
git bisect  bad 7fa01c90f24ce7850460f4bef4905dacc66d07d0  # 06:43  B      0    44   60   0  0day head guard for 'devel-catchup-201708310002'
# extra tests on tree/branch tip/master
git bisect  bad 152d54a2bcf0fe120d7de9dc3491dc679687cbb4  # 06:45  B      0     6   19   0  Merge branch 'x86/asm'

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

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