Hi,
kernel v4.3-3155-g1b1050c,
found the following WARNING at boot time:
[ 15.363908] Freeing unused kernel memory: 628K (ffff880001963000 -
ffff880001a00000)
[ 15.370510] Freeing unused kernel memory: 1744K (ffff880001e4c000 -
ffff880002000000)
[ 15.380507] ------------[ cut here ]------------
[ 15.380746] WARNING: CPU: 4 PID: 1 at
arch/x86/mm/dump_pagetables.c:225 note_page+0x619/0x7e0()
[ 15.381208] x86/mm: Found insecure W+X mapping at address
ffffffffa0000000/0xffffffffa0000000
[ 15.381615] Modules linked in:
[ 15.381907] CPU: 4 PID: 1 Comm: swapper/0 Not tainted 4.3.0+ #3
[ 15.382163] Hardware name: IBM BladeCenter HS22 -[7870AC1]-/68Y8027
, BIOS -[P9E131AUS-1.05]- 10/18/2009
[ 15.382569] ffffffff81d29017 ffff880663607d60 ffffffff81334959
ffff880663607da8
[ 15.383222] ffff880663607d98 ffffffff81059a11 ffff880661fd9010
0000000000000004
[ 15.383850] 0000000000000000 ffff880663607e98 0000000000000000
ffff880663607df8
[ 15.384531] Call Trace:
[ 15.384763] [<ffffffff81334959>] dump_stack+0x4b/0x72
[ 15.384996] [<ffffffff81059a11>] warn_slowpath_common+0x81/0xc0
[ 15.385289] [<ffffffff81059a97>] warn_slowpath_fmt+0x47/0x50
[ 15.385562] [<ffffffff810521c9>] note_page+0x619/0x7e0
[ 15.385793] [<ffffffff8105269a>] ptdump_walk_pgd_level_core+0x30a/0x3b0
[ 15.386045] [<ffffffff81052762>] ptdump_walk_pgd_level_checkwx+0x12/0x20
[ 15.386284] [<ffffffff81048f69>] mark_rodata_ro+0xe9/0xf0
[ 15.386520] [<ffffffff8194e040>] ? rest_init+0x140/0x140
[ 15.386752] [<ffffffff8194e058>] kernel_init+0x18/0xe0
[ 15.386986] [<ffffffff8195b6ff>] ret_from_fork+0x3f/0x70
[ 15.387240] [<ffffffff8194e040>] ? rest_init+0x140/0x140
[ 15.387472] ---[ end trace efbf79af9fce1389 ]---
[ 15.387727] x86/mm: Checked W+X mappings: FAILED, 2 W+X pages found.