FYI, we noticed the below changes on git://bee.sh.intel.com/git/ydu19/linux cc-v4.5-on-3.16-rc2 commit 2a40fb40ef70d0a8bcd09a8f53747b003bea38d1 ("Implement Workload Consolidation in wakeup/fork/exec") +-------------------------------------------------------------+------------+------------+ | | fd1874a481 | 2a40fb40ef | +-------------------------------------------------------------+------------+------------+ | boot_successes | 0 | 0 | | boot_failures | 45 | 20 | | WARNING:CPU:PID:at_kernel/sched/core.c:build_sched_domain() | 45 | 20 | | backtrace:build_sched_domains | 45 | 20 | | backtrace:sched_init_smp | 45 | 20 | | backtrace:kernel_init_freeable | 45 | 20 | | BUG:unable_to_handle_kernel_paging_request | 0 | 2 | | Oops | 0 | 2 | | RIP:wake_up_new_task | 0 | 2 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 2 | | backtrace:do_fork | 0 | 2 | | backtrace:SyS_clone | 0 | 2 | +-------------------------------------------------------------+------------+------------+ [ 11.609987] Loading compiled-in X.509 certificates [ 11.616666] Loaded X.509 cert 'Magrathea: Glacier signing key: 836c6cd9b9f6594c62891a0b30cb9bfc3f5c8ac2' [ 11.627312] registered taskstats version 1 [ 11.633185] BUG: unable to handle kernel paging request at ffffffffa1d97218 [ 11.640985] IP: [] wake_up_new_task+0x5d/0x190 [ 11.647729] PGD 1c1c067 PUD 1c1d063 PMD 0 [ 11.652336] Oops: 0000 [#1] SMP [ 11.655964] Modules linked in: [ 11.659388] CPU: 9 PID: 308 Comm: kworker/u258:0 Not tainted 3.16.0-rc3-01588-gfe513d1 #1 [ 11.668524] Hardware name: Intel Corporation S2600CP/S2600CP, BIOS SE5C600.86B.99.99.x036.091920111209 09/19/2011 [ 11.679981] Workqueue: khelper __call_usermodehelper [ 11.685536] task: ffff880828ea9d90 ti: ffff880828ed0000 task.ti: ffff880828ed0000 [ 11.693890] RIP: 0010:[] [] wake_up_new_task+0x5d/0x190 [ 11.703328] RSP: 0000:ffff880828ed3d48 EFLAGS: 00010086 [ 11.709254] RAX: 00000000ffffffff RBX: 0000000000000002 RCX: ffffffff81d97220 [ 11.717223] RDX: 00000000ffffffff RSI: ffff88081864a0a8 RDI: ffff88042f01f018 [ 11.725194] RBP: ffff880828ed3d70 R08: 0000000000000002 R09: 0000000000000002 [ 11.733157] R10: ffff880427dd0000 R11: 000000000020606b R12: ffff880818649d90 [ 11.741110] R13: 0000000000000000 R14: ffff88081864a8d4 R15: 0000000000000246 [ 11.749077] FS: 0000000000000000(0000) GS:ffff88082ee20000(0000) knlGS:0000000000000000 [ 11.758108] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 11.764524] CR2: ffffffffa1d97218 CR3: 0000000001c19000 CR4: 00000000000407e0 [ 11.772486] Stack: [ 11.774742] 0000000000000002 ffff880818649d90 0000000000000000 0000000000000000 [ 11.783044] 00000000000001ef ffff880828ed3de0 ffffffff8106c31d ffff88042f043400 [ 11.791349] 0000000000000000 ffff8808189de400 ffffffff810125e2 0000000900000001 [ 11.799649] Call Trace: [ 11.802387] [] do_fork+0x12d/0x3b0 [ 11.808029] [] ? __switch_to+0x122/0x5a0 [ 11.814251] [] kernel_thread+0x26/0x30 [ 11.820276] [] __call_usermodehelper+0x7c/0x90 [ 11.827069] [] process_one_work+0x183/0x490 [ 11.833578] [] worker_thread+0x11d/0x5c0 [ 11.839800] [] ? rescuer_thread+0x3a0/0x3a0 [ 11.846320] [] kthread+0xd2/0xf0 [ 11.851767] [] ? kthread_create_on_node+0x170/0x170 [ 11.859075] [] ret_from_fork+0x7c/0xb0 [ 11.865103] [] ? kthread_create_on_node+0x170/0x170 [ 11.872393] Code: c9 4c 89 e7 8b 72 18 ba 08 00 00 00 ff 50 40 89 c2 49 0f a3 94 24 18 03 00 00 19 c9 85 c9 0f 84 1f 01 00 00 48 8b 0d db a4 7a 00 <48> 0f a3 11 19 d2 85 d2 0f 84 0a 01 00 00 89 c6 4c 89 e7 48 c7 [ 11.894176] RIP [] wake_up_new_task+0x5d/0x190 [ 11.900992] RSP [ 11.904882] CR2: ffffffffa1d97218 [ 11.908591] ---[ end trace 158020c21b9c3f39 ]--- [ 11.922189] Kernel panic - not syncing: Fatal exception Disclaimer: Results have been estimated based on internal Intel analysis and are provided for informational purposes only. Any difference in system hardware or software design or configuration may affect actual performance. Thanks, Aaron