Hello, I am booting a kernel with CONFIG_UBSAN and during boot I see the following error message: ================================================================================ UBSAN: Undefined behaviour in drivers/acpi/acpica/dsutils.c:641:16 index -1 is out of range for type 'acpi_operand_object *[9]' CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.8.0-rc2+ #13 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 0000000000000000 ffff88006bcd7308 ffffffff81db32c0 0000000041b58ab3 ffffffff83e0a194 ffffffff81db31c0 ffff88006bcd7330 ffff88006bcd72d0 0000000000000000 ffffffff85181560 0000000000000001 ffff88006bcd7398 Call Trace: [< inline >] __dump_stack lib/dump_stack.c:15 [<ffffffff81db32c0>] dump_stack+0x100/0x180 lib/dump_stack.c:51 [<ffffffff81e643f0>] ubsan_epilogue+0x12/0x8f lib/ubsan.c:164 [<ffffffff81e65673>] __ubsan_handle_out_of_bounds+0x164/0x19c lib/ubsan.c:382 [<ffffffff81f8e007>] acpi_ds_create_operand+0x6d9/0x7fa drivers/acpi/acpica/dsutils.c:641 [<ffffffff81f8e41a>] acpi_ds_create_operands+0x2f2/0x37c drivers/acpi/acpica/dsutils.c:751 [<ffffffff81f8fc49>] acpi_ds_exec_end_op+0x941/0xed4 drivers/acpi/acpica/dswexec.c:529 [<ffffffff81fce3f4>] acpi_ps_parse_loop+0x156a/0x1620 drivers/acpi/acpica/psloop.c:609 [<ffffffff81fd137a>] acpi_ps_parse_aml+0x266/0x83a drivers/acpi/acpica/psparse.c:508 [<ffffffff81fd34e2>] acpi_ps_execute_method+0x58c/0x5fb drivers/acpi/acpica/psxface.c:221 [<ffffffff81fbeed8>] acpi_ns_evaluate+0x706/0x91f drivers/acpi/acpica/nseval.c:238 [<ffffffff81fc8ad5>] acpi_evaluate_object+0x3dd/0x7e7 drivers/acpi/acpica/nsxfeval.c:366 [< inline >] map_mat_entry drivers/acpi/processor_core.c:173 [<ffffffff81f6b17d>] acpi_get_phys_id+0xbb/0x5be drivers/acpi/processor_core.c:204 [<ffffffff81f6b885>] acpi_get_cpuid+0x25/0x33 drivers/acpi/processor_core.c:261 [< inline >] processor_physically_present drivers/acpi/processor_pdc.c:53 [<ffffffff869402c4>] early_init_pdc+0x156/0x198 drivers/acpi/processor_pdc.c:161 [<ffffffff81fc8538>] acpi_ns_walk_namespace+0x216/0x38f drivers/acpi/acpica/nswalk.c:270 [<ffffffff81fc909e>] acpi_walk_namespace+0xb5/0xef drivers/acpi/acpica/nsxfeval.c:618 [<ffffffff8694033b>] acpi_early_processor_set_pdc+0x35/0x4f drivers/acpi/processor_pdc.c:199 [< inline >] acpi_bus_init drivers/acpi/bus.c:1116 [<ffffffff8693ea58>] acpi_init+0x339/0x61e drivers/acpi/bus.c:1182 [<ffffffff81000586>] do_one_initcall+0xb6/0x2b0 init/main.c:778 [< inline >] do_initcall_level init/main.c:843 [< inline >] do_initcalls init/main.c:851 [< inline >] do_basic_setup init/main.c:869 [<ffffffff868ad23e>] kernel_init_freeable+0x5d5/0x69c init/main.c:1016 [<ffffffff837496d3>] kernel_init+0x13/0x1b0 init/main.c:942 [<ffffffff8376056f>] ret_from_fork+0x1f/0x40 arch/x86/entry/entry_64.S:393 ================================================================================ I am on 6040e57658eee6eb1315a26119101ca832d1f854 (Aug 19). Config is defconfig+kvmconfig + the following configs (but that's probably irrelevant): CONFIG_KCOV=y CONFIG_KCOV_INSTRUMENT_ALL=y CONFIG_DEBUG_FS=y CONFIG_DEBUG_INFO=y CONFIG_KALLSYMS=y CONFIG_KASAN=y CONFIG_KASAN_INLINE=y CONFIG_UBSAN=y CONFIG_UBSAN_SANITIZE_ALL=y CONFIG_DEBUG_KMEMLEAK=y CONFIG_PROVE_RCU=y CONFIG_DEBUG_STRICT_USER_COPY_CHECKS=y CONFIG_LOCKUP_DETECTOR=y CONFIG_BOOTPARAM_HARDLOCKUP_PANIC=y CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC=y CONFIG_BOOTPARAM_HUNG_TASK_PANIC=y CONFIG_DETECT_HUNG_TASK=y CONFIG_WQ_WATCHDOG=y CONFIG_PROVE_LOCKING=y CONFIG_DEBUG_RT_MUTEXES=y CONFIG_DEBUG_SPINLOCK=y CONFIG_DEBUG_MUTEXES=y CONFIG_DEBUG_ATOMIC_SLEEP=y CONFIG_DEBUG_LIST=y CONFIG_DEBUG_PI_LIST=y I boot kernel as: $ qemu-system-x86_64 -m 2048 -net nic -net user -display none -serial stdio -no-reboot -enable-kvm -smp 2 -kernel arch/x86/boot/bzImage -append "console=ttyS0 root=/dev/sda debug earlyprintk=serial slub_debug=UZ rootfstype=9p root=/dev/root rootflags=trans=virtio,version=9p2000.L,cache=loose init=/init-syzkaller.sh" -fsdev local,id=fsdev0,path=/,security_model=none -device virtio-9p-pci,fsdev=fsdev0,mount_tag=/dev/root -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
