FYI, we noticed the below changes on https://git.linaro.org/people/mturquette/linux.git eas-next commit 1fadb581b0be9420b143e43ff2f4a07ea7e45f6c ("sched: Make usage and load tracking cpu scale-invariant") +-------------------------------------------------------+------------+------------+ | | e754569101 | 1fadb581b0 | +-------------------------------------------------------+------------+------------+ | boot_successes | 20 | 0 | | early-boot-hang | 1 | | | boot_failures | 0 | 10 | | BUG:unable_to_handle_kernel | 0 | 8 | | Oops | 0 | 8 | | EIP_is_at_default_scale_cpu_capacity | 0 | 8 | | Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0 | 8 | | backtrace:acpi_load_tables | 0 | 7 | | backtrace:acpi_early_init | 0 | 7 | | backtrace:acpi_ds_auto_serialize_method | 0 | 1 | | backtrace:acpi_ds_init_one_object | 0 | 1 | | BUG:kernel_boot_crashed | 0 | 2 | | backtrace:vfs_kern_mount | 0 | 1 | | backtrace:mnt_init | 0 | 1 | | backtrace:vfs_caches_init | 0 | 1 | +-------------------------------------------------------+------------+------------+ [ 0.008000] Calibrating delay loop (skipped) preset value.. 5387.12 BogoMIPS (lpj=10774248) [ 0.008000] pid_max: default: 32768 minimum: 301 [ 0.008000] ACPI: Core revision 20140926 [ 0.008008] BUG: unable to handle kernel NULL pointer dereference at 0000003c [ 0.008941] IP: [] default_scale_cpu_capacity+0xb/0x3f [ 0.009921] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 [ 0.010656] Oops: 0000 [#1] PREEMPT SMP [ 0.011229] Modules linked in: [ 0.011641] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.18.0-00170-g02b1eae #75 [ 0.012000] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 0.012000] task: cbd02320 ti: cbcfc000 task.ti: cbcfc000 [ 0.012000] EIP: 0060:[] EFLAGS: 00210046 CPU: 0 [ 0.012000] EIP is at default_scale_cpu_capacity+0xb/0x3f [ 0.012000] EAX: 00000000 EBX: 00000400 ECX: 00000000 EDX: 00000000 [ 0.012000] ESI: 00000000 EDI: cbd02320 EBP: d4409ed4 ESP: d4409ed0 [ 0.012000] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 0.012000] CR0: 80050033 CR2: 0000003c CR3: 0c01f000 CR4: 000406b0 [ 0.012000] Stack: [ 0.012000] 00000400 d4409edc cb285e66 d4409eec cb285e88 00000000 cbd02364 d4409f50 [ 0.012000] cb286be9 00000000 00000000 00000000 cb281a77 d4409f34 d48ce760 00000000 [ 0.012000] d4409f34 0029e5eb d48ce278 d48ce220 007a15c4 00000000 00000000 00000000 [ 0.012000] Call Trace: [ 0.012000] [] arch_scale_cpu_capacity+0xd/0xf [ 0.012000] [] contrib_scale_factor+0x20/0x2a [ 0.012000] [] task_tick_fair+0x10c/0x6f5 [ 0.012000] [] ? sched_clock_cpu+0x1b2/0x1da [ 0.012000] [] scheduler_tick+0x48/0x75 [ 0.012000] [] update_process_times+0x62/0x6e [ 0.012000] [] tick_periodic+0xb3/0xb5 [ 0.012000] [] tick_handle_periodic+0x21/0xa5 [ 0.012000] [] timer_interrupt+0x12/0x19 [ 0.012000] [] handle_irq_event_percpu+0x104/0x374 [ 0.012000] [] handle_irq_event+0x31/0x48 [ 0.012000] [] handle_level_irq+0xeb/0x12c [ 0.012000] [] ? unmask_irq+0x3a/0x3a [ 0.012000] [] handle_irq+0x10d/0x161 [ 0.012000] [ 0.012000] [] do_IRQ+0x42/0xfa [ 0.012000] [] common_interrupt+0x2e/0x34 [ 0.012000] [] ? acpi_tb_allocate_owner_id+0x4e/0x5d [ 0.012000] [] ? check_preemption_disabled+0x9/0x172 [ 0.012000] [] debug_smp_processor_id+0x12/0x14 [ 0.012000] [] kmem_cache_alloc+0x66/0x2af [ 0.012000] [] ? preempt_count_sub+0xe7/0x1b0 [ 0.012000] [] acpi_ut_allocate_object_desc_dbg+0x3a/0x74 [ 0.012000] [] acpi_ut_create_internal_object_dbg+0x18/0xa4 [ 0.012000] [] acpi_ds_create_operand+0x2e5/0x374 [ 0.012000] [] ? preempt_count_sub+0xe7/0x1b0 [ 0.012000] [] acpi_ds_create_operands+0x7d/0xd1 [ 0.012000] [] ? acpi_ps_init_op+0x8/0x12 [ 0.012000] [] ? acpi_ps_get_next_simple_arg+0xd7/0xe2 [ 0.012000] [] acpi_ds_load1_end_op+0x274/0x309 [ 0.012000] [] acpi_ps_parse_loop+0x811/0x89a [ 0.012000] [] acpi_ps_parse_aml+0x104/0x42d [ 0.012000] [] acpi_ns_one_complete_parse+0x1a3/0x1b7 [ 0.012000] [] acpi_ns_parse_table+0x1d/0x63 [ 0.012000] [] acpi_ns_load_table+0x8e/0xf5 [ 0.012000] [] acpi_load_tables+0xd2/0x1cd [ 0.012000] [] acpi_early_init+0xd1/0x1b6 [ 0.012000] [] start_kernel+0x444/0x49e [ 0.012000] [] i386_start_kernel+0x90/0x94 [ 0.012000] Code: 10 8b 14 95 a0 37 f7 cb 89 bc 10 90 00 00 00 eb 07 31 c0 e9 b0 fd ff ff 83 c4 1c 5b 5e 5f 5d c3 55 89 e5 53 e8 e7 5c 63 00 31 c9 40 3c 80 89 c3 74 09 31 c9 83 78 68 01 0f 97 c1 8b 04 8d e8 [ 0.012000] EIP: [] default_scale_cpu_capacity+0xb/0x3f SS:ESP 0068:d4409ed0 [ 0.012000] CR2: 000000000000003c [ 0.012000] ---[ end trace 361e6bc79614a98d ]--- [ 0.012000] Kernel panic - not syncing: Fatal exception in interrupt Thanks, Huang, Ying