FYI, we noticed the following commit:

commit: 243b72aae28ca1032284028323bb81c9235b15c9 ("x86/mm/ptdump: Optimize check for W+X mappings for CONFIG_KASAN=y")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

in testcase: trinity
with following parameters:

	runtime: 300s

test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/


on test machine: qemu-system-x86_64 -enable-kvm -m 512M

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


+-----------------------------------------------------+------------+------------+
|                                                     | 5b1ad68f9b | 243b72aae2 |
+-----------------------------------------------------+------------+------------+
| boot_successes                                      | 0          | 0          |
| boot_failures                                       | 8          | 6          |
| BUG:KASAN:slab-out-of-bounds                        | 8          | 6          |
| WARNING:at_arch/x86/mm/dump_pagetables.c:#note_page | 0          | 6          |
+-----------------------------------------------------+------------+------------+



[   25.592875] WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:226 note_page+0x820/0xaf0
[   25.592875] WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:226 note_page+0x820/0xaf0
[   25.597768] x86/mm: Found insecure W+X mapping at address ffffffffa0000000/0xffffffffa0000000
[   25.597768] x86/mm: Found insecure W+X mapping at address ffffffffa0000000/0xffffffffa0000000
[   25.601564] Modules linked in:
[   25.601564] Modules linked in:
[   25.603072] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G    B           4.10.0-rc8-00007-g243b72a #2
[   25.603072] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G    B           4.10.0-rc8-00007-g243b72a #2
[   25.607397] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[   25.607397] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[   25.611819] Call Trace:
[   25.611819] Call Trace:
[   25.612954]  dump_stack+0x63/0x8d
[   25.612954]  dump_stack+0x63/0x8d
[   25.614457]  __warn+0x10d/0x130
[   25.614457]  __warn+0x10d/0x130
[   25.615885]  warn_slowpath_fmt+0x4a/0x50
[   25.615885]  warn_slowpath_fmt+0x4a/0x50
[   25.617775]  ? _raw_spin_unlock_irq+0x22/0x40
[   25.617775]  ? _raw_spin_unlock_irq+0x22/0x40
[   25.619940]  note_page+0x820/0xaf0
[   25.619940]  note_page+0x820/0xaf0
[   25.621416]  ptdump_walk_pgd_level_core+0x420/0x480
[   25.621416]  ptdump_walk_pgd_level_core+0x420/0x480
[   25.623820]  ? 0xffffffff81000000
[   25.623820]  ? 0xffffffff81000000
[   25.625369]  ptdump_walk_pgd_level_checkwx+0x12/0x20
[   25.625369]  ptdump_walk_pgd_level_checkwx+0x12/0x20
[   25.627604]  mark_rodata_ro+0x112/0x120
[   25.627604]  mark_rodata_ro+0x112/0x120
[   25.629364]  ? rest_init+0xe0/0xe0
[   25.629364]  ? rest_init+0xe0/0xe0
[   25.630915]  kernel_init+0x2a/0x120
[   25.630915]  kernel_init+0x2a/0x120
[   25.632542]  ? rest_init+0xe0/0xe0
[   25.632542]  ? rest_init+0xe0/0xe0
[   25.634340]  ret_from_fork+0x2c/0x40
[   25.634340]  ret_from_fork+0x2c/0x40
[   25.635989] ---[ end trace 583b8aa56cec4492 ]---


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
Xiaolong