Greeting, FYI, we noticed the following commit (built with gcc-9): commit: b955362805a1e47c5a659acf7187c6d2cf226e66 ("lru: cacheline 64 bytes for each of lru lists") https://github.com/alexshi/linux.git nextlru in testcase: boot on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 8G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +-----------------------------------------------------+---------------+------------+ | | next-20201210 | b955362805 | +-----------------------------------------------------+---------------+------------+ | boot_successes | 8 | 0 | | boot_failures | 0 | 30 | | WARNING:at_include/linux/vmstat.h:#si_mem_available | 0 | 30 | | EIP:si_mem_available | 0 | 30 | | BUG:kernel_NULL_pointer_dereference,address | 0 | 30 | | Oops:#[##] | 0 | 30 | | EIP:__list_add_valid | 0 | 30 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 30 | +-----------------------------------------------------+---------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <oliver.sang(a)intel.com&gt; [ 0.232823] WARNING: CPU: 0 PID: 0 at include/linux/vmstat.h:209 si_mem_available+0x33/0xc0 [ 0.234161] Modules linked in: [ 0.234570] CPU: 0 PID: 0 Comm: swapper Not tainted 5.10.0-rc7-next-20201210-00001-gb955362805a1 #1 [ 0.235723] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 0.236783] EIP: si_mem_available+0x33/0xc0 [ 0.237322] Code: e5 56 53 83 ec 38 eb 17 8d b4 26 00 00 00 00 8b 01 89 44 95 bc 83 fa 0e 74 1d 83 c1 04 89 d0 8d 50 01 83 e8 05 83 f8 01 77 e5 <0f> 0b 8b 01 89 44 95 bc eb e6 8d 76 00 e8 fb 1a fd ff 31 db 85 c0 [ 0.239712] EAX: 00000000 EBX: 83477100 ECX: 841f8914 EDX: 00000006 [ 0.240505] ESI: 83467f38 EDI: 00000002 EBP: 83467f08 ESP: 83467ec8 [ 0.241302] DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068 EFLAGS: 00210097 [ 0.242169] CR0: 80050033 CR2: ffdec000 CR3: 03b14000 CR4: 00040690 [ 0.242960] Call Trace: [ 0.243271] ? __alloc_pages_nodemask+0x134/0x2c0 [ 0.243869] ? __alloc_pages_nodemask+0x15c/0x2c0 [ 0.244467] __rb_allocate_pages+0x24/0x1c0 [ 0.245074] rb_allocate_cpu_buffer+0x19c/0x240 [ 0.245646] __ring_buffer_alloc+0xcc/0x160 [ 0.246233] tracer_alloc_buffers+0xb7/0x2ba [ 0.246915] early_trace_init+0x53/0x5c [ 0.247537] start_kernel+0x1e1/0x417 [ 0.248023] ? early_idt_handler_common+0x50/0x50 [ 0.248619] i386_start_kernel+0x42/0x44 [ 0.249116] startup_32_smp+0x15f/0x170 [ 0.249621] irq event stamp: 0 [ 0.250028] hardirqs last enabled at (0): [<00000000>] 0x0 [ 0.250732] hardirqs last disabled at (0): [<00000000>] 0x0 [ 0.251440] softirqs last enabled at (0): [<00000000>] 0x0 [ 0.252156] softirqs last disabled at (0): [<00000000>] 0x0 [ 0.252883] random: get_random_bytes called from init_oops_id+0x3a/0x40 with crng_init=0 [ 0.252893] ---[ end trace 4bc0c53f48cce3f8 ]--- To reproduce: # build kernel cd linux cp config-5.10.0-rc7-next-20201210-00001-gb955362805a1 .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 Thanks, Oliver Sang