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X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Jan 2026 13:29:42.7002 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: sCZk44zDuqPAWW1rp/tcipB//MvXrzNJFEEFySmPJ+Fv6+oS1D2BLhUHcwItcjqsi0ppHRMG2h9OHfg5ZBd/eA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR11MB7159 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "UBSAN:shift-out-of-bounds_in_lib/dynamic_debug.c" on: commit: 37e1c3e5c714f09a36daac2b5c3c55b3b7f9fae4 ("dyndbg: cache the dynamic prefixes per callsite.") https://github.com/jimc/linux.git wk-modhash in testcase: boot config: i386-randconfig-007-20260122 compiler: gcc-14 test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G (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 | Closes: https://lore.kernel.org/oe-lkp/202601262104.7de47c0d-lkp@intel.com [ 14.780445][ T188] ------------[ cut here ]------------ [ 14.781136][ T188] UBSAN: shift-out-of-bounds in lib/dynamic_debug.c:1829:32 [ 14.782062][ T188] shift exponent 56 is too large for 32-bit type 'long unsigned int' [ 14.782876][ T188] CPU: 1 UID: 0 PID: 188 Comm: modprobe Tainted: G W 6.19.0-rc6-00045-g37e1c3e5c714 #1 PREEMPT(voluntary) 2e75ccc13652b2427b0e513c9a339818f0710a46 [ 14.782881][ T188] Tainted: [W]=WARN [ 14.782882][ T188] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 14.782887][ T188] Call Trace: [ 14.782888][ T188] ? show_stack (arch/x86/kernel/dumpstack.c:338) [ 14.782897][ T188] dump_stack_lvl (lib/dump_stack.c:122) [ 14.782903][ T188] dump_stack (lib/dump_stack.c:130) [ 14.782906][ T188] ubsan_epilogue (lib/ubsan.c:234 (discriminator 1)) [ 14.782910][ T188] __ubsan_handle_shift_out_of_bounds.cold (lib/ubsan.c:494) [ 14.782917][ T188] ddebug_prefix_key (lib/dynamic_debug.c:1830) [ 14.782920][ T188] ddebug_drop_cached_prefix (lib/dynamic_debug.c:1836) [ 14.782923][ T188] ddebug_module_notify.cold (lib/dynamic_debug.c:1770 (discriminator 3) lib/dynamic_debug.c:1798 (discriminator 3)) [ 14.782926][ T188] notifier_call_chain (kernel/notifier.c:87) [ 14.782931][ T188] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 14.782935][ T188] do_init_module (kernel/module/main.c:3140) [ 14.782937][ T188] load_module (kernel/module/main.c:3515) [ 14.782943][ T188] init_module_from_file (kernel/module/main.c:3719) [ 14.782948][ T188] __ia32_sys_finit_module (kernel/module/main.c:3730 kernel/module/main.c:3756 kernel/module/main.c:3740 kernel/module/main.c:3740) [ 14.782954][ T188] ia32_sys_call (arch/x86/entry/syscall_32.c:50) [ 14.782956][ T188] do_int80_syscall_32 (arch/x86/entry/syscall_32.c:83 (discriminator 1) arch/x86/entry/syscall_32.c:259 (discriminator 1)) [ 14.782960][ T188] entry_INT80_32 (arch/x86/entry/entry_32.S:945) [ 14.782962][ T188] EIP: 0x37ee2092 [ 14.782965][ T188] Code: 00 00 00 e9 90 ff ff ff ff a3 24 00 00 00 68 30 00 00 00 e9 80 ff ff ff ff a3 f8 ff ff ff 66 90 00 00 00 00 00 00 00 00 cd 80 8d b4 26 00 00 00 00 8d b6 00 00 00 00 8b 1c 24 c3 8d b4 26 00 All code ======== 0: 00 00 add %al,(%rax) 2: 00 e9 add %ch,%cl 4: 90 nop 5: ff (bad) 6: ff (bad) 7: ff (bad) 8: ff a3 24 00 00 00 jmp *0x24(%rbx) e: 68 30 00 00 00 push $0x30 13: e9 80 ff ff ff jmp 0xffffffffffffff98 18: ff a3 f8 ff ff ff jmp *-0x8(%rbx) 1e: 66 90 xchg %ax,%ax ... 28: cd 80 int $0x80 2a:* c3 ret <-- trapping instruction 2b: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 32: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi 38: 8b 1c 24 mov (%rsp),%ebx 3b: c3 ret 3c: 8d .byte 0x8d 3d: b4 26 mov $0x26,%ah ... Code starting with the faulting instruction =========================================== 0: c3 ret 1: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 8: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi e: 8b 1c 24 mov (%rsp),%ebx 11: c3 ret 12: 8d .byte 0x8d 13: b4 26 mov $0x26,%ah ... [ 14.782967][ T188] EAX: ffffffda EBX: 00000003 ECX: 004a3214 EDX: 00000000 [ 14.782969][ T188] ESI: 01ae5ef0 EDI: 01ae5530 EBP: 00000000 ESP: 3f958ca8 [ 14.782970][ T188] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00200216 [ 14.782975][ T188] ---[ end trace ]--- The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260126/202601262104.7de47c0d-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki