Greeting, FYI, we noticed the following commit (built with gcc-9): commit: c272d5f23c2fa36042842bb5ed7654c8764efd5d ("kernel/sysctl.c: use DECLARE_SYSCTL_BASE()") https://git.kernel.org/cgit/linux/kernel/git/mcgrof/linux-next.git 20211123-sysctl-cleanups 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): +---------------------------+------------+------------+ | | cd7ce8f202 | c272d5f23c | +---------------------------+------------+------------+ | sysctl_duplicate_entry | 0 | 18 | +---------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <oliver.sang(a)intel.com&gt; [ 0.454587][ T0] Calibrating delay loop (skipped) preset value.. 4191.74 BogoMIPS (lpj=6983593) [ 0.456024][ T0] pid_max: default: 32768 minimum: 301 [ 0.457946][ T0] LSM: Security Framework initializing [ 0.458865][ T0] Mount-cache hash table entries: 32768 (order: 6, 262144 bytes, linear) [ 0.460223][ T0] Mountpoint-cache hash table entries: 32768 (order: 6, 262144 bytes, linear) [ 0.461890][ T0] sysctl duplicate entry: //exception-trace [ 0.462838][ T0] CPU: 0 PID: 0 Comm: swapper Not tainted 5.16.0-rc2-next-20211123-00037-gc272d5f23c2f #1 [ 0.464578][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 0.465936][ T0] Call Trace: [ 0.466422][ T0] <TASK> [ 0.466916][ T0] dump_stack (kbuild/src/consumer/lib/dump_stack.c:114) [ 0.467913][ T0] __register_sysctl_table (kbuild/src/consumer/fs/proc/proc_sysctl.c:1385) [ 0.468737][ T0] register_leaf_sysctl_tables (kbuild/src/consumer/fs/proc/proc_sysctl.c:1507) [ 0.469560][ T0] __register_sysctl_paths (kbuild/src/consumer/fs/proc/proc_sysctl.c:1593) To reproduce: # build kernel cd linux cp config-5.16.0-rc2-next-20211123-00037-gc272d5f23c2f .config make HOSTCC=gcc-9 CC=gcc-9 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules make HOSTCC=gcc-9 CC=gcc-9 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. --- 0DAY/LKP+ Test Infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation Thanks, Oliver Sang