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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: Jz/1UxWMK8TF/zwIFg3h2UoKNwSoX+3KAj/Qaq5AnjTc+yDlJvLHuEBsxd8DlH8jb0mcZVpySgkZO8s+d3Vh6g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ1PR11MB6129 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Message-ID: <202312072255.202c77fb-oliver.sang@intel.com> TO: Qais Yousef CC: oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, aubrey.li@linux.intel.com, yu.c.chen@intel.com BCC: Hello, kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: commit: 897408e9b705bc0f61b481a7622c65516bb9456d ("sched/fair: Implement new type of misfit MISFIT_POWER") https://github.com/qais-yousef/linux generalized-misfit-lb in testcase: boot compiler: clang-16 test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G (please refer to attached dmesg/kmsg for entire log/backtrace) +-------------------------------------------------------+------------+------------+ | | 59d2a8aad6 | 897408e9b7 | +-------------------------------------------------------+------------+------------+ | boot_successes | 13 | 0 | | boot_failures | 0 | 12 | | BUG:kernel_NULL_pointer_dereference,address | 0 | 12 | | Oops:#[##] | 0 | 12 | | EIP:load_balance | 0 | 12 | +-------------------------------------------------------+------------+------------+ 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/202312072255.202c77fb-oliver.sang@intel.com [ 1.566108][ T2] BUG: kernel NULL pointer dereference, address: 00000814 [ 1.566084][ T1] devtmpfs: initialized [ 1.566968][ T2] #PF: supervisor read access in kernel mode [ 1.566972][ T2] #PF: error_code(0x0000) - not-present page [ 1.568159][ T2] *pde = 00000000 [ 1.568159][ T2] Oops: 0000 [#1] PREEMPT SMP [ 1.568159][ T2] CPU: 0 PID: 2 Comm: kthreadd Not tainted 6.7.0-rc1-00024-g897408e9b705 #7 [ 1.568159][ T2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 1.568159][ T2] EIP: load_balance (kernel/sched/fair.c:11258) [ 1.568159][ T2] Code: 35 b0 db cd c2 8b 4c 24 1c 8b 44 24 28 8b 51 08 8b 4c 24 40 83 f8 08 0f 83 37 19 00 00 0f a3 01 0f 83 3b 1c 00 00 8b 44 24 20 <83> b8 14 08 00 00 01 75 11 8b 44 24 2c 83 b8 14 08 00 00 01 0f 85 All code ======== 0: 35 b0 db cd c2 xor $0xc2cddbb0,%eax 5: 8b 4c 24 1c mov 0x1c(%rsp),%ecx 9: 8b 44 24 28 mov 0x28(%rsp),%eax d: 8b 51 08 mov 0x8(%rcx),%edx 10: 8b 4c 24 40 mov 0x40(%rsp),%ecx 14: 83 f8 08 cmp $0x8,%eax 17: 0f 83 37 19 00 00 jae 0x1954 1d: 0f a3 01 bt %eax,(%rcx) 20: 0f 83 3b 1c 00 00 jae 0x1c61 26: 8b 44 24 20 mov 0x20(%rsp),%eax 2a:* 83 b8 14 08 00 00 01 cmpl $0x1,0x814(%rax) <-- trapping instruction 31: 75 11 jne 0x44 33: 8b 44 24 2c mov 0x2c(%rsp),%eax 37: 83 b8 14 08 00 00 01 cmpl $0x1,0x814(%rax) 3e: 0f .byte 0xf 3f: 85 .byte 0x85 Code starting with the faulting instruction =========================================== 0: 83 b8 14 08 00 00 01 cmpl $0x1,0x814(%rax) 7: 75 11 jne 0x1a 9: 8b 44 24 2c mov 0x2c(%rsp),%eax d: 83 b8 14 08 00 00 01 cmpl $0x1,0x814(%rax) 14: 0f .byte 0xf 15: 85 .byte 0x85 [ 1.568159][ T2] EAX: 00000000 EBX: fffedb16 ECX: c3c38398 EDX: c3c919a0 [ 1.568159][ T2] ESI: c3c383a8 EDI: c3c38398 EBP: c3e7be98 ESP: c3e7bd20 [ 1.568159][ T2] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010093 [ 1.568159][ T2] CR0: 80050033 CR2: 00000814 CR3: 02e36000 CR4: 00040690 [ 1.568159][ T2] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 1.568159][ T2] DR6: fffe0ff0 DR7: 00000400 [ 1.568159][ T2] Call Trace: [ 1.568159][ T2] ? __die_body (arch/x86/kernel/dumpstack.c:478 arch/x86/kernel/dumpstack.c:420) [ 1.568159][ T2] ? __die (arch/x86/kernel/dumpstack.c:434) [ 1.568159][ T2] ? page_fault_oops (arch/x86/mm/fault.c:703) [ 1.568159][ T2] ? rcu_read_lock_any_held (kernel/rcu/update.c:386) [ 1.568159][ T2] ? kernelmode_fixup_or_oops (arch/x86/mm/fault.c:761) [ 1.568159][ T2] ? __bad_area_nosemaphore (arch/x86/mm/fault.c:817) [ 1.568159][ T2] ? bad_area_nosemaphore (arch/x86/mm/fault.c:866) [ 1.568159][ T2] ? do_user_addr_fault (arch/x86/mm/fault.c:?) [ 1.568159][ T2] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67) [ 1.568159][ T2] ? exc_page_fault (arch/x86/include/asm/irqflags.h:19 arch/x86/include/asm/irqflags.h:67 arch/x86/include/asm/irqflags.h:127 arch/x86/mm/fault.c:1513 arch/x86/mm/fault.c:1561) [ 1.568159][ T2] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1518) [ 1.568159][ T2] ? handle_exception (arch/x86/entry/entry_32.S:1049) [ 1.568159][ T2] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1518) [ 1.568159][ T2] ? load_balance (kernel/sched/fair.c:11258) [ 1.568159][ T2] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1518) [ 1.568159][ T2] ? load_balance (kernel/sched/fair.c:11258) [ 1.568159][ T2] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) [ 1.568159][ T2] ? sched_clock_noinstr (arch/x86/kernel/tsc.c:266) [ 1.568159][ T2] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) [ 1.568159][ T2] ? sched_clock_noinstr (arch/x86/kernel/tsc.c:266) [ 1.568159][ T2] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) [ 1.568159][ T2] ? sched_clock_noinstr (arch/x86/kernel/tsc.c:266) [ 1.568159][ T2] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67) [ 1.568159][ T2] ? lock_acquire (kernel/locking/lockdep.c:?) [ 1.568159][ T2] ? update_blocked_averages (kernel/sched/sched.h:1401) [ 1.568159][ T2] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67) [ 1.568159][ T2] ? lock_is_held_type (kernel/locking/lockdep.c:?) [ 1.568159][ T2] newidle_balance (kernel/sched/fair.c:12425) [ 1.568159][ T2] pick_next_task_fair (kernel/sched/fair.c:8521) [ 1.568159][ T2] __schedule (kernel/sched/core.c:6021) [ 1.568159][ T2] ? debug_smp_processor_id (lib/smp_processor_id.c:60) [ 1.568159][ T2] schedule (kernel/sched/core.c:6802 kernel/sched/core.c:6816) [ 1.568159][ T2] kthreadd (kernel/kthread.c:753) [ 1.568159][ T2] ? kthread_stop_put (kernel/kthread.c:737) [ 1.568159][ T2] ret_from_fork (arch/x86/kernel/process.c:153) [ 1.568159][ T2] ret_from_fork_asm (arch/x86/entry/entry_32.S:741) [ 1.568159][ T2] entry_INT80_32 (arch/x86/entry/entry_32.S:947) [ 1.568159][ T2] Modules linked in: [ 1.568159][ T2] CR2: 0000000000000814 [ 1.568159][ T2] ---[ end trace 0000000000000000 ]--- The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20231207/202312072255.202c77fb-oliver.sang@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki