FYI, we noticed the following commit:

commit: 45fc8757d1d2128e342b4e7ef39adedf7752faac ("x86: Make the GDT remapping read-only on 64-bit")
https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git x86/mm

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -m 420M

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+------------------------------------------+------------+------------+
|                                          | 69218e4799 | 45fc8757d1 |
+------------------------------------------+------------+------------+
| boot_successes                           | 8          | 2          |
| boot_failures                            | 0          | 11         |
| BUG:unable_to_handle_kernel              | 0          | 11         |
| Oops:#[##]                               | 0          | 11         |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 11         |
+------------------------------------------+------------+------------+



[    4.347219] BUG: unable to handle kernel paging request at ffffffffff577060
[    4.349770] IP: 0xf77e91ed
[    4.351365] PGD 1e0c067 
[    4.351366] P4D 1e0c067 
[    4.352885] PUD 1e0e067 
[    4.354421] PMD 1e0f067 
[    4.355947] PTE 800000000be09161
[    4.357457] 
[    4.360480] Oops: 0003 [#1] SMP
[    4.362150] Modules linked in:
[    4.363816] CPU: 0 PID: 1 Comm: init Not tainted 4.11.0-rc2-00014-g45fc875 #15
[    4.367207] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[    4.371277] task: ffff88000b9a8000 task.stack: ffffc900000d0000
[    4.373550] RIP: 0023:0xf77e91ed
[    4.375284] RSP: 002b:00000000ffed034c EFLAGS: 00010246
[    4.377409] RAX: 0000000000000063 RBX: 00000000f77edff0 RCX: 00000000ffed034c
[    4.379996] RDX: 00000000f77e1690 RSI: 00000000f77ee094 RDI: 000000000000000c
[    4.382588] RBP: 00000000ffed0368 R08: 0000000000000000 R09: 0000000000000000
[    4.385136] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[    4.387709] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[    4.390289] FS:  0000000000000000(0000) GS:ffff88000be00000(0000) knlGS:0000000000000000
[    4.393870] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[    4.396131] CR2: ffffffffff577060 CR3: 0000000019d08000 CR4: 00000000000006f0
[    4.398696] RIP: 0xf77e91ed RSP: 00000000ffed034c
[    4.400716] CR2: ffffffffff577060
[    4.402425] ---[ end trace 35060e6ad8052d5b ]---


To reproduce:

        git clone https://github.com/01org/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
Kernel Test Robot