Greeting,

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

commit: 0a1d3d4a3c5b6ac940e93041df8ad78430f0df95 ("[PATCH 2/2] lib: Add test for bitmap_cut()")
url: https://github.com/0day-ci/linux/commits/Stefano-Brivio/lib-Fix-bitmap_cut-for-overlaps-add-test/20200608-171544


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):


+----------------------------------------------------------------------------------------+------------+------------+
|                                                                                        | 28010335d0 | 0a1d3d4a3c |
+----------------------------------------------------------------------------------------+------------+------------+
| boot_successes                                                                         | 6          | 0          |
| boot_failures                                                                          | 2          | 8          |
| Kernel_panic-not_syncing:VFS:Unable_to_mount_root_fs_on_unknown-block(#,#)             | 2          |            |
| Kernel_panic-not_syncing:stack-protector:Kernel_stack_is_corrupted_in:test_bitmap_init | 0          | 8          |
+----------------------------------------------------------------------------------------+------------+------------+


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


[   33.028685] test_printf: all 364 tests passed
[   33.030451] test_bitmap: loaded.
[   33.031050] test_bitmap: parselist: 14: input is '0-2047:128/256' OK, Time: 721
[   33.031968] test_bitmap: parselist_user: 14: input is '0-2047:128/256' OK, Time: 1161
[   33.034559] test_bitmap: all 1663 tests passed
[   33.035085] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: test_bitmap_init+0x202/0x20b
[   33.036182] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.7.0-12705-g0a1d3d4a3c5b6 #2
[   33.036182] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[   33.036182] Call Trace:
[   33.036182]  dump_stack+0x50/0x63
[   33.036182]  panic+0x100/0x2b4
[   33.036182]  ? printk+0x53/0x6a
[   33.036182]  ? test_bitmap_init+0x202/0x20b
[   33.036182]  __stack_chk_fail+0x10/0x10
[   33.036182]  test_bitmap_init+0x202/0x20b
[   33.036182]  ? test_zero_clear+0x1ab/0x1ab
[   33.036182]  do_one_initcall+0x6e/0x158
[   33.036182]  kernel_init_freeable+0x202/0x29f
[   33.036182]  ? rest_init+0xf7/0xf7
[   33.036182]  kernel_init+0x5/0xf0
[   33.036182]  ret_from_fork+0x1f/0x30
[   33.036182] Kernel Offset: disabled

Elapsed time: 60

qemu-img create -f qcow2 disk-vm-snb-24-0 256G


To reproduce:

        # build kernel
	cd linux
	cp config-5.7.0-12705-g0a1d3d4a3c5b6 .config
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=x86_64 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



Thanks,
lkp