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