FYI, we noticed the following commit: https://github.com/lanaczko/linux odzioba_mem_leak commit 813cededcd9ef8291492374b010ae61c4276e1c0 ("mm/swap.c: flush lru pvecs on compound page arrival") on test machine: vm-lkp-wsx03-openwrt-i386: 1 threads qemu-system-i386 -enable-kvm with 192M memory caused below changes: +-------------------------------------------------------+------------+------------+ | | 67016f6cdf | 813cededcd | +-------------------------------------------------------+------------+------------+ | boot_successes | 8 | 0 | | boot_failures | 2 | 2 | | IP-Config:Auto-configuration_of_network_failed | 2 | | | backtrace:acpi_get_cpuid | 2 | 2 | | backtrace:early_init_pdc | 2 | 2 | | backtrace:acpi_early_processor_set_pdc | 2 | 2 | | backtrace:acpi_init | 2 | 2 | | backtrace:kernel_init_freeable | 2 | 2 | | BUG:unable_to_handle_kernel | 0 | 2 | | Oops | 0 | 2 | | Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0 | 2 | | backtrace:populate_rootfs | 0 | 2 | | backtrace:vfs_write | 0 | 1 | | backtrace:SyS_write | 0 | 1 | +-------------------------------------------------------+------------+------------+ [ 0.742573] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.7.0-rc4-00015-g813cede #200 [ 0.742573] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.7.0-rc4-00015-g813cede #200 [ 0.743939] 00000000 [ 0.743939] 00000000 00000000 00000000 8016dc48 8016dc48 812d2160 812d2160 00000001 00000001 8016dc68 8016dc68 8016dc6c 8016dc6c 8016dc54 8016dc54 [ 0.745436] 8131ac11 [ 0.745436] 8131ac11 81daed8c 81daed8c 8016dca4 8016dca4 8131b1d1 8131b1d1 81b15e1e 81b15e1e 8016dc6c 8016dc6c 81daeda4 81daeda4 00200202 00200202 [ 0.746927] 0000312d [ 0.746927] 0000312d 80268d88 80268d88 8016dc80 8016dc80 810381de 810381de 00120008 00120008 80267388 80267388 80267388 80267388 8016dc94 8016dc94 [ 0.748450] Call Trace: [ 0.748450] Call Trace: [ 0.748897] [<812d2160>] dump_stack+0x57/0x79 [ 0.748897] [<812d2160>] dump_stack+0x57/0x79 [ 0.749696] [<8131ac11>] ubsan_epilogue+0xb/0x33 [ 0.749696] [<8131ac11>] ubsan_epilogue+0xb/0x33 [ 0.750539] [<8131b1d1>] __ubsan_handle_out_of_bounds+0x56/0x72 [ 0.750539] [<8131b1d1>] __ubsan_handle_out_of_bounds+0x56/0x72 [ 0.751610] [<810381de>] ? lookup_address+0x1c/0x1f [ 0.751610] [<810381de>] ? lookup_address+0x1c/0x1f [ 0.752506] [<810381de>] ? lookup_address+0x1c/0x1f [ 0.752506] [<810381de>] ? lookup_address+0x1c/0x1f [ 0.753398] [<81378261>] acpi_ds_create_operand+0x207/0x290 [ 0.753398] [<81378261>] acpi_ds_create_operand+0x207/0x290 [ 0.754417] [<81365e38>] ? acpi_os_release_object+0x8/0xc [ 0.754417] [<81365e38>] ? acpi_os_release_object+0x8/0xc [ 0.755398] [<813783de>] acpi_ds_create_operands+0xf4/0x139 [ 0.755398] [<813783de>] acpi_ds_create_operands+0xf4/0x139 [ 0.756413] [<81365e38>] ? acpi_os_release_object+0x8/0xc [ 0.756413] [<81365e38>] ? acpi_os_release_object+0x8/0xc [ 0.757408] [<813994c9>] ? acpi_ut_delete_generic_state+0x13/0x15 [ 0.757408] [<813994c9>] ? acpi_ut_delete_generic_state+0x13/0x15 [ 0.758531] [<8138fb63>] ? acpi_ps_pop_scope+0xb4/0x109 [ 0.758531] [<8138fb63>] ? acpi_ps_pop_scope+0xb4/0x109 [ 0.759493] [<813789aa>] acpi_ds_exec_end_op+0xe2/0x4b5 [ 0.759493] [<813789aa>] acpi_ds_exec_end_op+0xe2/0x4b5 [ 0.760460] [<8138e5af>] acpi_ps_parse_loop+0x2ad/0x6a7 [ 0.760460] [<8138e5af>] acpi_ps_parse_loop+0x2ad/0x6a7 [ 0.761430] [<813961b4>] ? acpi_ut_remove_reference+0x25/0x28 [ 0.761430] [<813961b4>] ? acpi_ut_remove_reference+0x25/0x28 [ 0.762470] [<813764fa>] ? acpi_ds_call_control_method+0x133/0x197 [ 0.762470] [<813764fa>] ? acpi_ds_call_control_method+0x133/0x197 [ 0.763594] [<8138f78a>] acpi_ps_parse_aml+0x95/0x280 [ 0.763594] [<8138f78a>] acpi_ps_parse_aml+0x95/0x280 [ 0.764524] [<813901a7>] acpi_ps_execute_method+0x1a8/0x1d7 [ 0.764524] [<813901a7>] acpi_ps_execute_method+0x1a8/0x1d7 [ 0.765535] [<813893b9>] acpi_ns_evaluate+0x1ee/0x265 [ 0.765535] [<813893b9>] acpi_ns_evaluate+0x1ee/0x265 [ 0.766459] [<8138ca0f>] ? acpi_evaluate_object+0x3e/0x241 [ 0.766459] [<8138ca0f>] ? acpi_evaluate_object+0x3e/0x241 [ 0.767460] [<8138cb1c>] acpi_evaluate_object+0x14b/0x241 [ 0.767460] [<8138cb1c>] acpi_evaluate_object+0x14b/0x241 [ 0.768457] [<8138cc01>] ? acpi_evaluate_object+0x230/0x241 [ 0.768457] [<8138cc01>] ? acpi_evaluate_object+0x230/0x241 [ 0.769476] [<8136d363>] acpi_get_phys_id+0x32/0x197 [ 0.769476] [<8136d363>] acpi_get_phys_id+0x32/0x197 [ 0.770391] [<8136d5a0>] acpi_get_cpuid+0xb/0x15 [ 0.770391] [<8136d5a0>] acpi_get_cpuid+0xb/0x15 [ 0.771239] [<820e1728>] early_init_pdc+0x81/0x95 [ 0.771239] [<820e1728>] early_init_pdc+0x81/0x95 [ 0.772105] [<8138c79f>] acpi_ns_walk_namespace+0xcf/0x1a6 [ 0.772105] [<8138c79f>] acpi_ns_walk_namespace+0xcf/0x1a6 [ 0.773111] [<8138cd60>] acpi_walk_namespace+0x76/0xa0 [ 0.773111] [<8138cd60>] acpi_walk_namespace+0x76/0xa0 [ 0.774070] [<820e16a7>] ? acpi_processor_init+0x1e/0x1e [ 0.774070] [<820e16a7>] ? acpi_processor_init+0x1e/0x1e [ 0.775044] [<820e0e3d>] ? acpi_sleep_init+0x111/0x111 [ 0.775044] [<820e0e3d>] ? acpi_sleep_init+0x111/0x111 [ 0.775984] [<820e175a>] acpi_early_processor_set_pdc+0x1e/0x36 [ 0.775984] [<820e175a>] acpi_early_processor_set_pdc+0x1e/0x36 [ 0.777067] [<820e16a7>] ? acpi_processor_init+0x1e/0x1e [ 0.777067] [<820e16a7>] ? acpi_processor_init+0x1e/0x1e [ 0.778053] [<820e0f83>] acpi_init+0x146/0x26f [ 0.778053] [<820e0f83>] acpi_init+0x146/0x26f [ 0.778878] [<820e0e3d>] ? acpi_sleep_init+0x111/0x111 [ 0.778878] [<820e0e3d>] ? acpi_sleep_init+0x111/0x111 [ 0.779818] [<820a5f95>] do_one_initcall+0x117/0x1a9 [ 0.779818] [<820a5f95>] do_one_initcall+0x117/0x1a9 [ 0.780722] [<820a567f>] ? repair_env_string+0x13/0x83 [ 0.780722] [<820a567f>] ? repair_env_string+0x13/0x83 [ 0.781655] [<8106a381>] ? parse_args+0x2ae/0x374 [ 0.781655] [<8106a381>] ? parse_args+0x2ae/0x374 [ 0.782513] [<81077242>] ? preempt_count_sub+0xca/0xeb [ 0.782513] [<81077242>] ? preempt_count_sub+0xca/0xeb [ 0.783445] [<820a61fb>] kernel_init_freeable+0x1d4/0x25c [ 0.783445] [<820a61fb>] kernel_init_freeable+0x1d4/0x25c [ 0.784423] [<81845655>] kernel_init+0x9/0xe8 [ 0.784423] [<81845655>] kernel_init+0x9/0xe8 [ 0.785218] [<8184c6ee>] ret_from_kernel_thread+0xe/0x30 [ 0.785218] [<8184c6ee>] ret_from_kernel_thread+0xe/0x30 [ 0.786182] [<8184564c>] ? rest_init+0xa1/0xa1 [ 0.786182] [<8184564c>] ? rest_init+0xa1/0xa1 [ 0.786983] ================================================================================ [ 0.786983] ================================================================================ [ 0.793291] ACPI: Interpreter enabled FYI, raw QEMU command line is: qemu-system-i386 -enable-kvm -kernel /pkg/linux/i386-randconfig-i1-201625/gcc-6/813cededcd9ef8291492374b010ae61c4276e1c0/vmlinuz-4.7.0-rc4-00015-g813cede -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-lkp-wsx03-openwrt-i386-21/rand_boot-1-openwrt-i386.cgz-i386-randconfig-i1-201625-813cededcd9ef8291492374b010ae61c4276e1c0-20160621-54604-egcj9l-1.yaml ARCH=i386 kconfig=i386-randconfig-i1-201625 branch=lanaczko/odzioba_mem_leak commit=813cededcd9ef8291492374b010ae61c4276e1c0 BOOT_IMAGE=/pkg/linux/i386-randconfig-i1-201625/gcc-6/813cededcd9ef8291492374b010ae61c4276e1c0/vmlinuz-4.7.0-rc4-00015-g813cede max_uptime=600 RESULT_ROOT=/result/boot/1/vm-lkp-wsx03-openwrt-i386/openwrt-i386.cgz/i386-randconfig-i1-201625/gcc-6/813cededcd9ef8291492374b010ae61c4276e1c0/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal rw ip=::::vm-lkp-wsx03-openwrt-i386-21::dhcp drbd.minor_count=8' -initrd /fs/sdc1/initrd-vm-lkp-wsx03-openwrt-i386-21 -m 192 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -drive file=/fs/sdc1/disk0-vm-lkp-wsx03-openwrt-i386-21,media=disk,if=virtio -drive file=/fs/sdc1/disk1-vm-lkp-wsx03-openwrt-i386-21,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-lkp-wsx03-openwrt-i386-21 -serial file:/dev/shm/kboot/serial-vm-lkp-wsx03-openwrt-i386-21 -daemonize -display none -monitor null Thanks, Kernel Test Robot