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    SubjectRe: divide error in select_task_rq_fair()
    From
    Date
    Le mercredi 03 novembre 2010 à 22:12 -0600, Bjorn Helgaas a écrit :
    > Hi,
    >
    > With current upstream, I see the following crash at boot-time:
    >
    > Brought up 64 CPUs
    > Total of 64 processors activated (289366.52 BogoMIPS).
    > divide error: 0000 [#1] SMP
    > last sysfs file:
    > CPU 1
    > Modules linked in:
    >
    > Pid: 2, comm: kthreadd Not tainted 2.6.37-rc1-00027-gff8b16d #271 /ProLiant DL980 G7
    > RIP: 0010:[<ffffffff81034645>] [<ffffffff81034645>] select_task_rq_fair+0x62a/0x7a0
    >
    > Complete dmesg below; let me know if you need more info.

    Is the machine runs OK if you build a kernel with NR_CPUS=128 ?


    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 64/0x1 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x03] lapic_id[0x03] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 65/0x3 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x05] lapic_id[0x05] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 66/0x5 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x07] lapic_id[0x07] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 67/0x7 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x09] lapic_id[0x11] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 68/0x11 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x0b] lapic_id[0x13] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 69/0x13 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x0d] lapic_id[0x15] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 70/0x15 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x0f] lapic_id[0x17] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 71/0x17 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x11] lapic_id[0x21] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 72/0x21 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x13] lapic_id[0x23] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 73/0x23 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x15] lapic_id[0x25] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 74/0x25 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x17] lapic_id[0x27] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 75/0x27 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x19] lapic_id[0x31] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 76/0x31 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x1b] lapic_id[0x33] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 77/0x33 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x1d] lapic_id[0x35] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 78/0x35 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x1f] lapic_id[0x37] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 79/0x37 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x21] lapic_id[0x41] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 80/0x41 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x23] lapic_id[0x43] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 81/0x43 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x25] lapic_id[0x45] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 82/0x45 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x27] lapic_id[0x47] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 83/0x47 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x29] lapic_id[0x51] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 84/0x51 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x2b] lapic_id[0x53] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 85/0x53 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x2d] lapic_id[0x55] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 86/0x55 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x2f] lapic_id[0x57] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 87/0x57 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x31] lapic_id[0x61] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 88/0x61 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x33] lapic_id[0x63] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 89/0x63 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x35] lapic_id[0x65] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 90/0x65 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x37] lapic_id[0x67] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 91/0x67 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x39] lapic_id[0x71] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 92/0x71 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x3b] lapic_id[0x73] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 93/0x73 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x3d] lapic_id[0x75] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 94/0x75 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x3f] lapic_id[0x77] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 95/0x77 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x41] lapic_id[0x81] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 96/0x81 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x43] lapic_id[0x83] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 97/0x83 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x45] lapic_id[0x85] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 98/0x85 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x47] lapic_id[0x87] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 99/0x87 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x49] lapic_id[0x91] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 100/0x91 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x4b] lapic_id[0x93] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 101/0x93 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x4d] lapic_id[0x95] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 102/0x95 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x4f] lapic_id[0x97] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 103/0x97 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x51] lapic_id[0xa1] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 104/0xa1 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x53] lapic_id[0xa3] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 105/0xa3 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x55] lapic_id[0xa5] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 106/0xa5 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x57] lapic_id[0xa7] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 107/0xa7 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x59] lapic_id[0xb1] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 108/0xb1 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x5b] lapic_id[0xb3] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 109/0xb3 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x5d] lapic_id[0xb5] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 110/0xb5 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x5f] lapic_id[0xb7] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 111/0xb7 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x61] lapic_id[0xc1] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 112/0xc1 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x63] lapic_id[0xc3] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 113/0xc3 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x65] lapic_id[0xc5] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 114/0xc5 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x67] lapic_id[0xc7] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 115/0xc7 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x69] lapic_id[0xd1] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 116/0xd1 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x6b] lapic_id[0xd3] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 117/0xd3 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x6d] lapic_id[0xd5] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 118/0xd5 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x6f] lapic_id[0xd7] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 119/0xd7 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x71] lapic_id[0xe1] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 120/0xe1 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x73] lapic_id[0xe3] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 121/0xe3 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x75] lapic_id[0xe5] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 122/0xe5 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x77] lapic_id[0xe7] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 123/0xe7 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x79] lapic_id[0xf1] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 124/0xf1 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x7b] lapic_id[0xf3] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 125/0xf3 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x7d] lapic_id[0xf5] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 126/0xf5 ignored.
    > [ 0.000000] ACPI: LAPIC (acpi_id[0x7f] lapic_id[0xf7] enabled)
    > [ 0.000000] ACPI: NR_CPUS/possible_cpus limit of 64 reached. Processor 127/0xf7 ignored.
    > [ 0.000000] setup_percpu: NR_CPUS:64 nr_cpumask_bits:64 nr_cpu_ids:64 nr_node_ids:8
    > [ 0.000000] PERCPU: Embedded 26 pages/cpu @ffff88007ee00000 s75520 r8192 d22784 u262144
    > [ 0.000000] pcpu-alloc: s75520 r8192 d22784 u262144 alloc=1*2097152
    > [ 0.000000] pcpu-alloc: [0] 00 01 02 03 04 05 06 07 [0] 16 24 32 40 48 56 -- --
    > [ 0.000000] pcpu-alloc: [1] 08 09 10 11 12 13 14 15 [1] 17 25 33 41 49 57 -- --
    > [ 0.000000] pcpu-alloc: [2] 18 26 34 42 50 58 -- -- [3] 19 27 35 43 51 59 -- --
    > [ 0.000000] pcpu-alloc: [4] 20 28 36 44 52 60 -- -- [5] 21 29 37 45 53 61 -- --
    > [ 0.000000] pcpu-alloc: [6] 22 30 38 46 54 62 -- -- [7] 23 31 39 47 55 63 -- --
    > [ 0.000000] Built 8 zonelists in Zone order, mobility grouping on. Total pages: 24811904
    > [ 0.000000] Policy zone: Normal
    > [ 0.000000] Kernel command line: console=ttyS0,115200n8 ignore_loglevel printk.time=0 root=/dev/cciss/c0d1p1 BOOT_IMAGE=kernel
    > PID hash table entries: 4096 (order: 3, 32768 bytes)
    > Checking aperture...
    > No AGP bridge found
    > Calgary: detecting Calgary via BIOS EBDA area
    > Calgary: Unable to locate Rio Grande table in EBDA - bailing!
    > Memory: 99187376k/947912704k available (6286k kernel code, 847260136k absent, 1465192k reserved, 6950k data, 628k init)
    > SLUB: Genslabs=15, HWalign=64, Order=0-3, MinObjects=0, CPUs=64, Nodes=8
    > Hierarchical RCU implementation.
    > RCU-based detection of stalled CPUs is disabled.
    > NR_IRQS:4352 nr_irqs:2008 16
    > Extended CMOS year: 2000
    > Console: colour VGA+ 80x25
    > console [ttyS0] enabled
    > hpet clockevent registered
    > Fast TSC calibration using PIT
    > Detected 2261.072 MHz processor.
    > Calibrating delay loop (skipped), value calculated using timer frequency.. 4522.14 BogoMIPS (lpj=2261072)
    > pid_max: default: 65536 minimum: 512
    > Security Framework initialized
    > SELinux: Initializing.
    > SELinux: Starting in permissive mode
    > Dentry cache hash table entries: 16777216 (order: 15, 134217728 bytes)
    > Inode-cache hash table entries: 8388608 (order: 14, 67108864 bytes)
    > Mount-cache hash table entries: 256
    > Initializing cgroup subsys ns
    > ns_cgroup deprecated: consider using the 'clone_children' flag without the ns_cgroup.
    > Initializing cgroup subsys cpuacct
    > Initializing cgroup subsys freezer
    > CPU: Physical Processor ID: 0
    > CPU: Processor Core ID: 0
    > mce: CPU supports 22 MCE banks
    > CPU0: Thermal monitoring enabled (TM1)
    > using mwait in idle threads.
    > Performance Events: PEBS fmt1+, Nehalem events, Intel PMU driver.
    > ... version: 3
    > ... bit width: 48
    > ... generic registers: 4
    > ... value mask: 0000ffffffffffff
    > ... max period: 000000007fffffff
    > ... fixed-purpose events: 3
    > ... event mask: 000000070000000f
    > ACPI: Core revision 20101013
    > DMAR: Host address width 40
    > DMAR: DRHD base: 0x000000ac000000 flags: 0x0
    > IOMMU 0: reg_base_addr ac000000 ver 1:0 cap c90780106f0462 ecap f0207e
    > DMAR: DRHD base: 0x000000a8000000 flags: 0x1
    > IOMMU 1: reg_base_addr a8000000 ver 1:0 cap c90780106f0462 ecap f0207e
    > DMAR: RMRR base: 0x0000007f7ee000 end: 0x0000007f7effff
    > DMAR: RMRR base: 0x0000007f7e7000 end: 0x0000007f7ecfff
    > DMAR: RMRR base: 0x0000007f62e000 end: 0x0000007f62ffff
    > DMAR: ATSR flags: 0x0
    > DMAR: ATSR flags: 0x0
    > Not enabling x2apic, Intr-remapping init failed.
    > Setting APIC routing to physical flat
    > ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
    > CPU0: Intel(R) Xeon(R) CPU X7560 @ 2.27GHz stepping 06
    > Booting Node 0, Processors #1 #2 #3 #4 #5 #6 #7 Ok.
    > Booting Node 1, Processors #8 #9 #10 #11 #12 #13 #14 #15 Ok.
    > Booting Node 0, Processors #16 Ok.
    > Booting Node 1, Processors #17 Ok.
    > Booting Node 2, Processors #18 Ok.
    > Booting Node 3, Processors #19 Ok.
    > Booting Node 4, Processors #20 Ok.
    > Booting Node 5, Processors #21 Ok.
    > Booting Node 6, Processors #22 Ok.
    > Booting Node 7, Processors #23 Ok.
    > Booting Node 0, Processors #24 Ok.
    > Booting Node 1, Processors #25 Ok.
    > Booting Node 2, Processors #26 Ok.
    > Booting Node 3, Processors #27 Ok.
    > Booting Node 4, Processors #28 Ok.
    > Booting Node 5, Processors #29 Ok.
    > Booting Node 6, Processors #30 Ok.

    All this seems wrong...

    > Booting Node 7, Processors #31 Ok.
    > Booting Node 0, Processors #32 Ok.
    > Booting Node 1, Processors #33 Ok.
    > Booting Node 2, Processors #34 Ok.
    > Booting Node 3, Processors #35 Ok.
    > Booting Node 4, Processors #36 Ok.
    > Booting Node 5, Processors #37 Ok.
    > Booting Node 6, Processors #38 Ok.
    > Booting Node 7, Processors #39 Ok.
    > Booting Node 0, Processors #40 Ok.
    > Booting Node 1, Processors #41 Ok.
    > Booting Node 2, Processors #42 Ok.
    > Booting Node 3, Processors #43 Ok.
    > Booting Node 4, Processors #44 Ok.
    > Booting Node 5, Processors #45 Ok.
    > Booting Node 6, Processors #46 Ok.
    > Booting Node 7, Processors #47 Ok.
    > Booting Node 0, Processors #48 Ok.
    > Booting Node 1, Processors #49 Ok.
    > Booting Node 2, Processors #50 Ok.
    > Booting Node 3, Processors #51 Ok.
    > Booting Node 4, Processors #52 Ok.
    > Booting Node 5, Processors #53 Ok.
    > Booting Node 6, Processors #54 Ok.
    > Booting Node 7, Processors #55 Ok.
    > Booting Node 0, Processors #56 Ok.
    > Booting Node 1, Processors #57 Ok.
    > Booting Node 2, Processors #58 Ok.
    > Booting Node 3, Processors #59 Ok.
    > Booting Node 4, Processors #60 Ok.
    > Booting Node 5, Processors #61 Ok.
    > Booting Node 6, Processors #62 Ok.
    > Booting Node 7, Processors #63 Ok.
    > Brought up 64 CPUs
    > Total of 64 processors activated (289366.52 BogoMIPS).
    > divide error: 0000 [#1] SMP
    > last sysfs file:
    > CPU 1
    > Modules linked in:
    >
    > Pid: 2, comm: kthreadd Not tainted 2.6.37-rc1-00027-gff8b16d #271 /ProLiant DL980 G7
    > RIP: 0010:[<ffffffff81034645>] [<ffffffff81034645>] select_task_rq_fair+0x62a/0x7a0
    > RSP: 0000:ffff88046f869c30 EFLAGS: 00010046
    > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
    > RDX: 0000000000000000 RSI: 0000000000000040 RDI: 0000000000000040
    > RBP: ffff88046f869d30 R08: 0000000000000000 R09: ffff88046fa62598
    > R10: 0000000000000000 R11: 0000000000000080 R12: ffff88046fa62580
    > R13: ffff88007ee4da50 R14: 0000000000011ac0 R15: 0000000000000000
    > FS: 0000000000000000(0000) GS:ffff88007ee40000(0000) knlGS:0000000000000000
    > CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    > CR2: 0000000000000000 CR3: 0000000001c07000 CR4: 00000000000006e0
    > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    > Process kthreadd (pid: 2, threadinfo ffff88046f868000, task ffff88e1f6c40750)
    > Stack:
    > ffff880400000000 0000000000011ac0 0000000000011ac0 0000000000011ac0
    > 0000000000011ac0 0000000000011ac8 0000000000011ac8 0000000000800711
    > 0000000800000000 ffff88046f418000 ffff88007ee51ac0 0000000081c19b60
    > Call Trace:
    > [<ffffffff810ab0a6>] ? perf_event_fork+0x10/0x12
    > [<ffffffff8103d735>] ? copy_process+0xdf0/0xf9a
    > [<ffffffff8103787b>] select_task_rq+0x13/0x4a
    > [<ffffffff81038dae>] wake_up_new_task+0x39/0xdb
    > [<ffffffff8103db35>] do_fork+0x256/0x314
    > [<ffffffff810333ae>] ? dequeue_entity+0x19/0x19b
    > [<ffffffff81033213>] ? set_next_entity+0x43/0x96
    > [<ffffffff81009978>] kernel_thread+0x6b/0x6d
    > [<ffffffff81057b76>] ? kthread+0x0/0x89
    > [<ffffffff81003850>] ? kernel_thread_helper+0x0/0x10
    > [<ffffffff81057cd5>] kthreadd+0xd6/0x111
    > [<ffffffff81003854>] kernel_thread_helper+0x4/0x10
    > [<ffffffff81057bff>] ? kthreadd+0x0/0x111
    > [<ffffffff81003850>] ? kernel_thread_helper+0x0/0x10
    > Code: ff ff ff e8 ea 8c 1b 00 3b 05 58 ec ca 00 89 c2 44 8b 85 00 ff ff ff 0f 8c 74 ff ff ff 41 8b 4c 24 08 48 c1 e3 0a 31 d2 48 89 d8 <48> f7 f1 83 7d 90 00 48 89 c1 75 16 4c 39 f8 73 0d 49 89 c7 48
    > RIP [<ffffffff81034645>] select_task_rq_fair+0x62a/0x7a0
    > RSP <ffff88046f869c30>
    > ---[ end trace 4eaa2a86a8e2da22 ]---
    > --
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