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X-CSE-ConnectionGUID: F/cSKxc6R8OvGbuiLD/pSg== X-CSE-MsgGUID: 4KjlQxzuRMaDbCYP3oDWYw== X-IronPort-AV: E=McAfee;i="6800,10657,11939"; a="957244" X-IronPort-AV: E=Sophos;i="6.27,166,1787036400"; d="scan'208";a="957244" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by fmvoesa105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Oct 2026 18:06:32 -0700 X-CSE-ConnectionGUID: qUoc8xwyTraRW04hp7SJDQ== X-CSE-MsgGUID: RwW62x8nSeuqk1g+ycjMiA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,166,1787036400"; d="scan'208";a="2465662" Received: from ly-workstation.sh.intel.com (HELO ly-workstation) ([10.239.182.64]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Oct 2026 18:06:26 -0700 Date: Mon, 19 Oct 2026 09:06:23 +0800 From: kernel test robot To: K Prateek Nayak Cc: oe-lkp@lists.linux.dev, lkp@intel.com, K Prateek Nayak , linux-kernel@vger.kernel.org, aubrey.li@linux.intel.com, yu.c.chen@intel.com, Peter Zijlstra , Tim Chen , Ingo Molnar , Juri Lelli , Vincent Guittot , Andrew Morton , Arnd Bergmann , linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mips@vger.kernel.org, loongarch@lists.linux.dev, driver-core@lists.linux.dev, Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Shrikanth Hegde , yi1.lai@intel.com Subject: Re: [RFC PATCH v3 13/13] sched/fair: Switch nohz.idle_cpus to use sbm Message-ID: <202610190859.d3459a50-lkp@intel.com> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261001192849.74788-14-kprateek.nayak@amd.com> Hello, kernel test robot noticed "kernel_BUG_at_kernel/smpboot.c" on: commit: d7dd59cf6a0f621f224947f960403a747b0836f0 ("[RFC PATCH v3 13/13] sched/fair: Switch nohz.idle_cpus to use sbm") url: https://github.com/intel-lab-lkp/linux/commits/K-Prateek-Nayak/lib-sbm-Introduce-helpers-for-architectures-to-configure-LLC-properties/20261001-192837 patch link: https://lore.kernel.org/all/20261001192849.74788-14-kprateek.nayak@amd.com/ patch subject: [RFC PATCH v3 13/13] sched/fair: Switch nohz.idle_cpus to use sbm in testcase: boot config: i386-randconfig-1006-20261010 compiler: clang-22 test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 4 -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/202610190859.d3459a50-lkp@intel.com [ 2.426107][ T37] ------------[ cut here ]------------ [ 2.430168][ T37] kernel BUG at kernel/smpboot.c:133! [ 2.433726][ T37] Oops: invalid opcode: 0000 [#1] SMP PTI [ 2.436546][ T37] CPU: 3 UID: 0 PID: 37 Comm: ksoftirqd/3 Tainted: G T 7.3.0-rc1+ #1 PREEMPTLAZY [ 2.436546][ T37] Tainted: [T]=RANDSTRUCT [ 2.436546][ T37] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 2.436546][ T37] EIP: smpboot_thread_fn (smpboot.c:117) [ 2.436546][ T37] Code: 83 7e 04 00 74 13 8b 06 31 d2 0f a3 05 6c 07 59 84 0f 92 c2 e8 12 65 b7 01 89 f0 e8 4b e9 2e 00 31 c0 83 c4 08 5e 5f 5b 5d c3 <0f> 0b b8 08 52 f5 83 e8 75 85 e6 ff 0f 0b b8 f8 51 f5 83 e8 69 85 All code ======== 0: 83 7e 04 00 cmpl $0x0,0x4(%rsi) 4: 74 13 je 0x19 6: 8b 06 mov (%rsi),%eax 8: 31 d2 xor %edx,%edx a: 0f a3 05 6c 07 59 84 bt %eax,-0x7ba6f894(%rip) # 0xffffffff8459077d 11: 0f 92 c2 setb %dl 14: e8 12 65 b7 01 call 0x1b7652b 19: 89 f0 mov %esi,%eax 1b: e8 4b e9 2e 00 call 0x2ee96b 20: 31 c0 xor %eax,%eax 22: 83 c4 08 add $0x8,%esp 25: 5e pop %rsi 26: 5f pop %rdi 27: 5b pop %rbx 28: 5d pop %rbp 29: c3 ret 2a:* 0f 0b ud2 <-- trapping instruction 2c: b8 08 52 f5 83 mov $0x83f55208,%eax 31: e8 75 85 e6 ff call 0xffffffffffe685ab 36: 0f 0b ud2 38: b8 f8 51 f5 83 mov $0x83f551f8,%eax 3d: e8 .byte 0xe8 3e: 69 .byte 0x69 3f: 85 .byte 0x85 Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: b8 08 52 f5 83 mov $0x83f55208,%eax 7: e8 75 85 e6 ff call 0xffffffffffe68581 c: 0f 0b ud2 e: b8 f8 51 f5 83 mov $0x83f551f8,%eax 13: e8 .byte 0xe8 14: 69 .byte 0x69 15: 85 .byte 0x85 [ 2.436546][ T37] EAX: 00000003 EBX: 858ac510 ECX: 83e26f98 EDX: 83c50f80 [ 2.436546][ T37] ESI: 8500dfb0 EDI: 00000000 EBP: 858e1f68 ESP: 858e1f54 [ 2.436546][ T37] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010293 [ 2.436546][ T37] CR0: 80050033 CR2: 00000000 CR3: 047ae000 CR4: 000006b0 [ 2.436546][ T37] Call Trace: [ 2.436546][ T37] kthread (kthread.c:436) [ 2.436546][ T37] ? smpboot_unregister_percpu_thread (linux/list.h:261) [ 2.436546][ T37] ? __do_trace_sched_kthread_stop_ret (trace/events/sched.h:38 (discriminator 13)) [ 2.436546][ T37] ret_from_fork (x86/kernel/process.c:158) [ 2.436546][ T37] ? __do_trace_sched_kthread_stop_ret (trace/events/sched.h:38 (discriminator 13)) [ 2.436546][ T37] ret_from_fork_asm (x86/entry/entry_32.S:736) [ 2.436546][ T37] entry_INT80_32 (x86/entry/entry_32.S:940) [ 2.436546][ T37] Modules linked in: [ 2.493945][ T37] ---[ end trace 0000000000000000 ]--- [ 2.496265][ T37] EIP: smpboot_thread_fn (smpboot.c:117) [ 2.498528][ T37] Code: 83 7e 04 00 74 13 8b 06 31 d2 0f a3 05 6c 07 59 84 0f 92 c2 e8 12 65 b7 01 89 f0 e8 4b e9 2e 00 31 c0 83 c4 08 5e 5f 5b 5d c3 <0f> 0b b8 08 52 f5 83 e8 75 85 e6 ff 0f 0b b8 f8 51 f5 83 e8 69 85 All code ======== 0: 83 7e 04 00 cmpl $0x0,0x4(%rsi) 4: 74 13 je 0x19 6: 8b 06 mov (%rsi),%eax 8: 31 d2 xor %edx,%edx a: 0f a3 05 6c 07 59 84 bt %eax,-0x7ba6f894(%rip) # 0xffffffff8459077d 11: 0f 92 c2 setb %dl 14: e8 12 65 b7 01 call 0x1b7652b 19: 89 f0 mov %esi,%eax 1b: e8 4b e9 2e 00 call 0x2ee96b 20: 31 c0 xor %eax,%eax 22: 83 c4 08 add $0x8,%esp 25: 5e pop %rsi 26: 5f pop %rdi 27: 5b pop %rbx 28: 5d pop %rbp 29: c3 ret 2a:* 0f 0b ud2 <-- trapping instruction 2c: b8 08 52 f5 83 mov $0x83f55208,%eax 31: e8 75 85 e6 ff call 0xffffffffffe685ab 36: 0f 0b ud2 38: b8 f8 51 f5 83 mov $0x83f551f8,%eax 3d: e8 .byte 0xe8 3e: 69 .byte 0x69 3f: 85 .byte 0x85 Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: b8 08 52 f5 83 mov $0x83f55208,%eax 7: e8 75 85 e6 ff call 0xffffffffffe68581 c: 0f 0b ud2 e: b8 f8 51 f5 83 mov $0x83f551f8,%eax 13: e8 .byte 0xe8 14: 69 .byte 0x69 15: 85 .byte 0x85 The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20261019/202610190859.d3459a50-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki