linux-kernel - [daveh-devel:old-ucode-platform] [x86/microcode] 19fb9a6d87: UBSAN:shift-out-of-bounds_in

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Message-ID: <202511200314.3033cba4-lkp@intel.com>
Date: Thu, 20 Nov 2025 10:56:12 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Dave Hansen <dave.hansen@...ux.intel.com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, Dave Hansen
	<dave.hansen@...el.com>, <linux-kernel@...r.kernel.org>,
	<oliver.sang@...el.com>
Subject: [daveh-devel:old-ucode-platform] [x86/microcode]  19fb9a6d87:
 UBSAN:shift-out-of-bounds_in_arch/x86/kernel/cpu/match.c



Hello,

kernel test robot noticed "UBSAN:shift-out-of-bounds_in_arch/x86/kernel/cpu/match.c" on:

commit: 19fb9a6d870e83926b240ba86a3e35870fa2e578 ("x86/microcode: Add platform mask to Intel microcode version list")
https://git.kernel.org/cgit/linux/kernel/git/daveh/devel.git old-ucode-platform

in testcase: lkvs
version: lkvs-x86_64-6d7ca2c-1_20251014
with following parameters:

	test: cstate-client



config: x86_64-rhel-9.4-func
compiler: gcc-14
test machine: 22 threads 1 sockets Intel(R) Core(TM) Ultra 9 185H @ 4.5GHz (Meteor Lake) with 32G memory

(please refer to attached dmesg/kmsg for entire log/backtrace)



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 <oliver.sang@...el.com>
| Closes: https://lore.kernel.org/oe-lkp/202511200314.3033cba4-lkp@intel.com


kern  :warn  : [    0.000000] [      T0] ------------[ cut here ]------------
kern  :err   : [    0.000000] [      T0] UBSAN: shift-out-of-bounds in arch/x86/kernel/cpu/match.c:80:9
kern  :err   : [    0.000000] [      T0] shift exponent 128 is too large for 64-bit type 'long unsigned int'
kern  :warn  : [    0.000000] [      T0] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.18.0-rc5-00007-g19fb9a6d870e #1 PREEMPT(undef)
kern  :warn  : [    0.000000] [      T0] Call Trace:
kern  :warn  : [    0.000000] [      T0]  <TASK>
kern  :warn  : [    0.000000] [      T0]  ? dump_stack_lvl (lib/dump_stack.c:122)
kern  :warn  : [    0.000000] [      T0]  ? ubsan_epilogue (lib/ubsan.c:234 (discriminator 1))
kern  :warn  : [    0.000000] [      T0]  ? __ubsan_handle_shift_out_of_bounds.cold (lib/ubsan.c:494)
kern  :warn  : [    0.000000] [      T0]  ? __pfx_check_cpufeature_deps (arch/x86/kernel/cpu/cpuid-deps.c:172)
kern  :warn  : [    0.000000] [      T0]  ? x86_match_cpu.cold (arch/x86/kernel/cpu/match.c:80)
kern  :warn  : [    0.000000] [      T0]  ? cpu_set_bug_bits+0x18/0x1980
kern  :warn  : [    0.000000] [      T0]  ? early_identify_cpu+0x1d2/0x270
kern  :warn  : [    0.000000] [      T0]  ? setup_arch (arch/x86/kernel/setup.c:934)
kern  :warn  : [    0.000000] [      T0]  ? mutex_lock (arch/x86/include/asm/atomic64_64.h:101 (discriminator 5) include/linux/atomic/atomic-arch-fallback.h:4296 (discriminator 5) include/linux/atomic/atomic-long.h:1482 (discriminator 5) include/linux/atomic/atomic-instrumented.h:4458 (discriminator 5) kernel/locking/mutex.c:157 (discriminator 5) kernel/locking/mutex.c:273 (discriminator 5))
kern  :warn  : [    0.000000] [      T0]  ? __pfx_setup_arch (arch/x86/kernel/setup.c:881)
kern  :warn  : [    0.000000] [      T0]  ? _printk (kernel/printk/printk.c:2443)
kern  :warn  : [    0.000000] [      T0]  ? __pfx__printk (kernel/printk/printk.c:2443)
kern  :warn  : [    0.000000] [      T0]  ? cgroup_init_early (kernel/cgroup/cgroup.c:6327 (discriminator 3))
kern  :warn  : [    0.000000] [      T0]  ? start_kernel (init/main.c:934)
kern  :warn  : [    0.000000] [      T0]  ? x86_64_start_reservations (arch/x86/kernel/head64.c:310)
kern  :warn  : [    0.000000] [      T0]  ? x86_64_start_kernel (??:?)
kern  :warn  : [    0.000000] [      T0]  ? common_startup_64 (arch/x86/kernel/head_64.S:419)
kern  :warn  : [    0.000000] [      T0]  </TASK>
kern  :warn  : [    0.000000] [      T0] ---[ end trace ]---


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20251120/202511200314.3033cba4-lkp@intel.com



-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki