Hi Peter,

We noticed that below commit changed the value of
CPU_ENTRY_AREA_MAP_SIZE. Seems KASAN uses this value to allocate memory,
and failed during initialization after this change, so we send this
mail and Cc KASAN folks. Please kindly check below report for more
details. Thanks.


Greeting,

FYI, we noticed Kernel_panic-not_syncing:kasan_populate_pmd:Failed_to_allocate_page due to commit (built with gcc-11):

commit: 1248fb6a8201ddac1c86a202f05a0a1765efbfce ("x86/mm: Randomize per-cpu entry area")
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 -cpu SandyBridge -smp 2 -m 16G

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


[    7.114808][    T0] Kernel panic - not syncing: kasan_populate_pmd+0x142/0x1d2: Failed to allocate page, nid=0 from=1000000
[    7.119742][    T0] CPU: 0 PID: 0 Comm: swapper Not tainted 6.1.0-rc1-00001-g1248fb6a8201 #1
[    7.122122][    T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
[    7.124976][    T0] Call Trace:
[    7.125849][    T0]  <TASK>
[    7.126642][    T0]  ? dump_stack_lvl+0x45/0x5d
[    7.127908][    T0]  ? panic+0x21e/0x46a
[    7.129009][    T0]  ? panic_print_sys_info+0x77/0x77
[    7.130618][    T0]  ? memblock_alloc_try_nid_raw+0x106/0x106
[    7.132224][    T0]  ? memblock_alloc_try_nid+0xd9/0x118
[    7.133717][    T0]  ? memblock_alloc_try_nid_raw+0x106/0x106
[    7.135252][    T0]  ? kasan_populate_pmd+0x142/0x1d2
[    7.136655][    T0]  ? early_alloc+0x95/0x9d
[    7.137738][    T0]  ? kasan_populate_pmd+0x142/0x1d2
[    7.138936][    T0]  ? kasan_populate_pud+0x182/0x19f
[    7.140335][    T0]  ? kasan_populate_shadow+0x1e0/0x233
[    7.141759][    T0]  ? kasan_init+0x3be/0x57f
[    7.142942][    T0]  ? setup_arch+0x101d/0x11f0
[    7.144229][    T0]  ? start_kernel+0x6f/0x3d0
[    7.145449][    T0]  ? secondary_startup_64_no_verify+0xe0/0xeb
[    7.147051][    T0]  </TASK>
[    7.147868][    T0] ---[ end Kernel panic - not syncing: kasan_populate_pmd+0x142/0x1d2: Failed to allocate page, nid=0 from=1000000 ]---


If you fix the issue, kindly add following tag
| Reported-by: kernel test robot <yujie.liu@intel.com>
| Link: https://lore.kernel.org/r/202210241508.2e203c3d-yujie.liu@intel.com


To reproduce:

        # build kernel
	cd linux
	cp config-6.1.0-rc1-00001-g1248fb6a8201 .config
	make HOSTCC=gcc-11 CC=gcc-11 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules
	make HOSTCC=gcc-11 CC=gcc-11 ARCH=x86_64 INSTALL_MOD_PATH=<mod-install-dir> modules_install
	cd <mod-install-dir>
	find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz


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

        # if come across any failure that blocks the test,
        # please remove ~/.lkp and /lkp dir to run from a clean state.


-- 
0-DAY CI Kernel Test Service
https://01.org/lkp