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X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: yt3gEqFRT9hyv7phed0XYpl0JdpzwWwsRibvTh/ydhGeno/juhMDgz1ghC3yXgEaa1h1SNz+fbxfeEFkuY5u/g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH3PPF801A91A7D X-OriginatorOrg: intel.com Hello, kernel test robot noticed "UBSAN:shift-out-of-bounds_in_mm/mm_init.c" on: commit: 842e0bacb55a7112f86ff21d520d821f7ab53e24 ("dev: use arch_zone_limits_init in free_area_init") https://git.kernel.org/cgit/linux/kernel/git/rppt/linux.git hugetlb-init/v0 in testcase: boot config: x86_64-randconfig-161-20251222 compiler: gcc-14 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G (please refer to attached dmesg/kmsg for entire log/backtrace) +---------------------------------------------+------------+------------+ | | 5466a334e0 | 842e0bacb5 | +---------------------------------------------+------------+------------+ | boot_successes | 12 | 0 | | boot_failures | 0 | 15 | | UBSAN:shift-out-of-bounds_in_mm/mm_init.c | 0 | 15 | | RIP:per_cpu_ptr_to_phys | 0 | 15 | | BUG:unable_to_handle_page_fault_for_address | 0 | 15 | | Oops | 0 | 15 | | RIP:__d_lookup | 0 | 15 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 15 | +---------------------------------------------+------------+------------+ If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202512231015.99637eb7-lkp@intel.com [ 1.772578][ T0] ------------[ cut here ]------------ [ 1.773160][ T0] UBSAN: shift-out-of-bounds in mm/mm_init.c:2450:21 [ 1.773928][ T0] shift exponent 18446744073709551615 is too large for 64-bit type 'long unsigned int' [ 1.774628][ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.19.0-rc1-00023-g842e0bacb55a #1 PREEMPT(undef) [ 1.775399][ T0] Call Trace: [ 1.775636][ T0] [ 1.775847][ T0] dump_stack_lvl (lib/dump_stack.c:122) [ 1.776180][ T0] ubsan_epilogue (lib/ubsan.c:234) [ 1.776499][ T0] __ubsan_handle_shift_out_of_bounds.cold (lib/ubsan.c:494) [ 1.776998][ T0] alloc_large_system_hash (mm/mm_init.c:2450 (discriminator 1)) [ 1.777401][ T0] vfs_caches_init_early (fs/dcache.c:3255 fs/dcache.c:3304) [ 1.777793][ T0] start_kernel (init/main.c:1064) [ 1.778118][ T0] x86_64_start_reservations (arch/x86/kernel/head64.c:310) [ 1.778513][ T0] x86_64_start_kernel (arch/x86/kernel/ebda.c:57) [ 1.778883][ T0] common_startup_64 (arch/x86/kernel/head_64.S:419) [ 1.779234][ T0] [ 1.779447][ T0] ---[ end trace ]--- The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20251223/202512231015.99637eb7-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki