FYI, we noticed the below changes on git://bee.sh.intel.com/git/ydu19/linux for-lkp commit 6fe1f1b9b13f9fd76d1230944482ee5bf2832252 ("sched: Remove task and group entity load_avg when they are dead") +---------------------------------------------------------------+------------+------------+ | | a1ec4288c6 | 6fe1f1b9b1 | +---------------------------------------------------------------+------------+------------+ | boot_successes | 10 | 71 | | early-boot-hang | 1 | | | boot_failures | 0 | 9 | | kernel_BUG_at_kernel/smpboot.c | 0 | 5 | | invalid_opcode | 0 | 5 | | RIP:smpboot_thread_fn | 0 | 5 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 5 | | Kernel_panic-not_syncing:Watchdog_detected_hard_LOCKUP_on_cpu | 0 | 1 | | backtrace:cpu_up | 0 | 1 | | backtrace:smp_init | 0 | 1 | | backtrace:kernel_init_freeable | 0 | 1 | | BUG:kernel_test_crashed | 0 | 3 | +---------------------------------------------------------------+------------+------------+ [ 3.205664] masked ExtINT on CPU#98 [ 3.205664] CPU98: Thermal LVT vector (0xfa) already installed [ 3.234545] ------------[ cut here ]------------ [ 3.235000] kernel BUG at kernel/smpboot.c:134! [ 3.235000] invalid opcode: 0000 [#1] SMP [ 3.235000] Modules linked in: [ 3.235000] CPU: 0 PID: 789 Comm: watchdog/98 Not tainted 3.17.0-rc7-g6fe1f1b #7 [ 3.235000] Hardware name: Intel Corporation BRICKLAND/BRICKLAND, BIOS BKLDSDP1.86B.0031.R01.1304221600 04/22/2013 [ 3.235000] task: ffff881853ed8000 ti: ffff881853ee0000 task.ti: ffff881853ee0000 [ 3.235000] RIP: 0010:[] [] smpboot_thread_fn+0x180/0x200 [ 3.235000] RSP: 0000:ffff881853ee3e88 EFLAGS: 00010202 [ 3.235000] RAX: 0000000000000000 RBX: ffff881853ed8000 RCX: 0000000000000000 [ 3.235000] RDX: ffff881853ee3fd8 RSI: ffff881853ed8000 RDI: 0000000000000062 [ 3.235000] RBP: ffff881853ee3ec8 R08: ffff881853ee0000 R09: 0000000000000000 [ 3.235000] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88185458e3e0 [ 3.235000] R13: ffffffff81cc6640 R14: ffff881853ed8000 R15: ffff881853ed8000 [ 3.235000] FS: 0000000000000000(0000) GS:ffff88085f800000(0000) knlGS:0000000000000000 [ 3.235000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3.235000] CR2: ffff88207f174000 CR3: 000000207ec38000 CR4: 00000000001407f0 [ 3.235000] Stack: [ 3.235000] 0000000000000000 ffff881853ee3ea0 ffffffff81858ff9 ffff881853cfbe40 [ 3.235000] ffff88185458e3e0 ffffffff81091f40 0000000000000000 0000000000000000 [ 3.235000] ffff881853ee3f48 ffffffff8108e1ab 0000000000000001 0000000000000062 [ 3.235000] Call Trace: [ 3.235000] [] ? schedule+0x29/0x70 [ 3.235000] [] ? SyS_setgroups+0x180/0x180 [ 3.235000] [] kthread+0xdb/0x100 [ 3.235000] [] ? kthread_create_on_node+0x180/0x180 [ 3.235000] [] ret_from_fork+0x7c/0xb0 [ 3.235000] [] ? kthread_create_on_node+0x180/0x180 [ 3.235000] Code: 44 00 00 41 8b 3c 24 65 8b 14 25 2c b0 00 00 39 d7 0f 85 84 00 00 00 ff d0 41 c7 44 24 04 02 00 00 00 e9 1d ff ff ff 0f 1f 40 00 <0f> 0b 66 0f 1f 44 00 00 48 c7 45 c8 00 00 00 00 48 8b 45 c8 65 [ 3.235000] RIP [] smpboot_thread_fn+0x180/0x200 [ 3.235000] RSP [ 3.235033] ---[ end trace c537e15456e615c3 ]--- [ 3.236004] Kernel panic - not syncing: Fatal exception Thanks, Fengguang