Greeting,

FYI, we noticed the following commit (built with gcc-9):

commit: ca95e676a1f3ea18bca11df611514ab582fec8f2 ("[PATCH] bitmap: simplify GENMASK(size - 1, 0) lines")
url: https://github.com/0day-ci/linux/commits/Qian-Cai/bitmap-simplify-GENMASK-size-1-0-lines/20211026-224815


in testcase: boot

on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G

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


+---------------------------------------------+---------------+------------+
|                                             | next-20211025 | ca95e676a1 |
+---------------------------------------------+---------------+------------+
| boot_successes                              | 11            | 0          |
| boot_failures                               | 0             | 12         |
| BUG:unable_to_handle_page_fault_for_address | 0             | 12         |
| Oops:#[##]                                  | 0             | 12         |
| EIP:sparse_init_nid                         | 0             | 12         |
| Kernel_panic-not_syncing:Fatal_exception    | 0             | 12         |
| Kernel_panic-not_syncing:Fatal_exception]   | 0             | 12         |
+---------------------------------------------+---------------+------------+


If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@intel.com>


[    0.177015][    T0] BUG: unable to handle page fault for address: 00001120
[    0.177738][    T0] #PF: supervisor read access in kernel mode
[    0.178348][    T0] #PF: error_code(0x0000) - not-present page
[    0.178970][    T0] *pdpt = 0000000000000000 *pde = f000ff53f000ff53
[    0.179768][    T0] Oops: 0000 [#1] PREEMPT SMP PTI
[    0.180290][    T0] CPU: 0 PID: 0 Comm: swapper Not tainted 5.15.0-rc6-next-20211025-00001-gca95e676a1f3 #1
[    0.181305][    T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[    0.182226][    T0] EIP: sparse_init_nid+0x21/0x1c2
[    0.182721][    T0] Code: 93 77 81 ff 8b 5d fc c9 c3 e8 1d 53 eb fe 55 89 e5 57 89 c7 56 53 89 d3 31 d2 83 ec 10 89 4d ec 8b 0c bd 20 f0 15 d9 8b 75 08
<ff> b1 20 11 00 00 6a 00 89 f0 6a 00 c1 e0 07 6a 00 6a 00 6a 00 6a
[    0.184741][    T0] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
[    0.185446][    T0] ESI: 00000008 EDI: 00000000 EBP: d8d59ec8 ESP: d8d59eac
[    0.186167][    T0] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00210086
[    0.186949][    T0] CR0: 80050033 CR2: 00001120 CR3: 19262000 CR4: 000406b0
[    0.187701][    T0] Call Trace:
[    0.188037][    T0]  sparse_init+0x1ad/0x1cc
[    0.188494][    T0]  paging_init+0x87/0x8f
[    0.188923][    T0]  native_pagetable_init+0xe0/0xe8
[    0.189437][    T0]  setup_arch+0xb2f/0xc39
[    0.189900][    T0]  start_kernel+0x60/0x576
[    0.190365][    T0]  ? set_intr_gate+0x47/0x5a
[    0.190836][    T0]  ? early_idt_handler_common+0x44/0x44
[    0.191403][    T0]  i386_start_kernel+0x48/0x4a
[    0.191891][    T0]  startup_32_smp+0x161/0x164
[    0.192347][    T0] Modules linked in:
[    0.192736][    T0] CR2: 0000000000001120
[    0.193160][    T0] random: get_random_bytes called from print_oops_end_marker+0x2c/0x80 with crng_init=0
[    0.193170][    T0] ---[ end trace 6f3fca0785832265 ]---
[    0.194700][    T0] EIP: sparse_init_nid+0x21/0x1c2
[    0.195205][    T0] Code: 93 77 81 ff 8b 5d fc c9 c3 e8 1d 53 eb fe 55 89 e5 57 89 c7 56 53 89 d3 31 d2 83 ec 10 89 4d ec 8b 0c bd 20 f0 15 d9 8b 75 08 <ff> b1 20 11 00 00 6a 00 89 f0 6a 00 c1 e0 07 6a 00 6a 00 6a 00 6a
[    0.197244][    T0] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
[    0.197955][    T0] ESI: 00000008 EDI: 00000000 EBP: d8d59ec8 ESP: d8d59eac
[    0.198678][    T0] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00210086
[    0.199470][    T0] CR0: 80050033 CR2: 00001120 CR3: 19262000 CR4: 000406b0
[    0.200229][    T0] Kernel panic - not syncing: Fatal exception
[    0.200865][    T0] ---[ end Kernel panic - not syncing: Fatal exception ]---



To reproduce:

        # build kernel
	cd linux
	cp config-5.15.0-rc6-next-20211025-00001-gca95e676a1f3 .config
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare bzImage

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> 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.



---
0DAY/LKP+ Test Infrastructure                   Open Source Technology Center
https://lists.01.org/hyperkitty/list/lkp@lists.01.org       Intel Corporation

Thanks,
Oliver Sang