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SubjectBUG: cannot online the hot-added cpu
When I onlined the hot-added cpu on linux-3.5-rc4, the following
messages was shown.

[ 129.745837] Booting Node 2 Processor 32 APIC 0xc0
[ 129.879044] ------------[ cut here ]------------
[ 129.934337] WARNING: at kernel/sched/core.c:6214 build_sched_domains+0x704/0x8e8()
[ 130.024978] Hardware name: PRIMEQUEST 1800E
[ 130.075155] Modules linked in: megaraid_sas dpemu ebtable_nat ebtables ipt_MASQUERADE iptable_nat
nf_nat xt_CHECKSUM iptable_mangle bridge stp llc sunrpc nf_conntrack_ipv4 nf_defrag_ipv4 ip6t_REJECT
nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables binfmt_misc
vhost_net macvtap macvlan tun uinput coretemp kvm_intel kvm crc32c_intel microcode i2c_i801 i2c_core
lpc_ich mfd_core pcspkr acpi_memhotplug e1000e i7core_edac edac_core ioatdma igb dca ptp pps_core
mptsas mptscsih mptbase scsi_transport_sas [last unloaded: scsi_wait_scan]
[ 130.669192] Pid: 10000, comm: bash Tainted: G A 3.5.0-rc4-ishi #48
[ 130.753595] Call Trace:
[ 130.782880] [<ffffffff81049fb6>] warn_slowpath_common+0x85/0x9d
[ 130.854807] [<ffffffff81049fe8>] warn_slowpath_null+0x1a/0x1c
[ 130.924651] [<ffffffff81075f79>] build_sched_domains+0x704/0x8e8
[ 130.997610] [<ffffffff810763d0>] partition_sched_domains+0x273/0x2e9
[ 131.074733] [<ffffffff810a6905>] cpuset_update_active_cpus+0x6b/0x72
[ 131.151860] [<ffffffff810722d0>] cpuset_cpu_active+0x20/0x27
[ 131.220662] [<ffffffff814fbc64>] notifier_call_chain+0x37/0x63
[ 131.291547] [<ffffffff8106b8fa>] __raw_notifier_call_chain+0xe/0x10
[ 131.367630] [<ffffffff8104cc01>] __cpu_notify+0x20/0x32
[ 131.431256] [<ffffffff814ef805>] _cpu_up+0xf7/0x128
[ 131.490692] [<ffffffff814ef905>] cpu_up+0xcf/0xe1
[ 131.548128] [<ffffffff814e01b4>] store_online+0x62/0x90
[ 131.611739] [<ffffffff8130daca>] dev_attr_store+0x20/0x22
[ 131.677426] [<ffffffff811990ab>] sysfs_write_file+0x101/0x13d
[ 131.747273] [<ffffffff8113e9e4>] vfs_write+0xae/0x10a
[ 131.808798] [<ffffffff8113eb03>] sys_write+0x4a/0x71
[ 131.869289] [<ffffffff814ff3a9>] system_call_fastpath+0x16/0x1b
[ 131.941169] ---[ end trace 6df754ed91edd189 ]---
[ 131.997505] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
[ 131.998051] IP: [<ffffffff81252cd8>] __bitmap_weight+0x31/0x8c
[ 131.998051] PGD 84f7e9067 PUD 842913067 PMD 0
[ 131.998051] Oops: 0000 [#1] SMP
[ 131.998051] CPU 17
[ 131.998051] Modules linked in: megaraid_sas dpemu ebtable_nat ebtables ipt_MASQUERADE iptable_nat
nf_nat xt_CHECKSUM iptable_mangle bridge stp llc sunrpc nf_conntrack_ipv4 nf_defrag_ipv4 ip6t_REJECT
nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables binfmt_misc
vhost_net macvtap macvlan tun uinput coretemp kvm_intel kvm crc32c_intel microcode i2c_i801 i2c_core
lpc_ich mfd_core pcspkr acpi_memhotplug e1000e i7core_edac edac_core ioatdma igb dca ptp pps_core
mptsas mptscsih mptbase scsi_transport_sas [last unloaded: scsi_wait_scan]
[ 131.998051]
[ 131.998051] Pid: 10000, comm: bash Tainted: G AW 3.5.0-rc4-ishi #48 FUJITSU-SV
PRIMEQUEST 1800E/SB
[ 131.998051] RIP: 0010:[<ffffffff81252cd8>] [<ffffffff81252cd8>] __bitmap_weight+0x31/0x8c
[ 131.998051] RSP: 0018:ffff8808408f3bd8 EFLAGS: 00010297
[ 131.998051] RAX: 0000000000000004 RBX: 0000000000000018 RCX: ffff8808408f3c08
[ 131.998051] RDX: 0000000000000018 RSI: 0000000000000100 RDI: 0000000000000018
[ 131.998051] RBP: ffff8808408f3c08 R08: 0000000000000100 R09: ffffffff81adfaa0
[ 131.998051] R10: 0000000000000000 R11: 0000000000000005 R12: 0000000000000000
[ 131.998051] R13: 0000000000000100 R14: 0000000000000004 R15: 0000000000000000
[ 131.998051] FS: 00007f9f7fd3a700(0000) GS:ffff88085f320000(0000) knlGS:0000000000000000
[ 131.998051] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 131.998051] CR2: 000000000073f778 CR3: 000000084436f000 CR4: 00000000000007e0
[ 131.998051] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 131.998051] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 131.998051] Process bash (pid: 10000, threadinfo ffff8808408f2000, task ffff8808471bdc80)
[ 131.998051] Stack:
[ 131.998051] 0000000000000000 0000000000000020 0000000000000000 ffff8808523f8000
[ 131.998051] ffffffff81ade070 ffff880844074000 ffff8808408f3cb8 ffffffff81075f88
[ 131.998051] ffff8808408f3c28 ffff88104ff85780 0000000000000020 000000000000fea8
[ 131.998051] Call Trace:
[ 131.998051] [<ffffffff81075f88>] build_sched_domains+0x713/0x8e8
[ 131.998051] [<ffffffff810763d0>] partition_sched_domains+0x273/0x2e9
[ 131.998051] [<ffffffff810a6905>] cpuset_update_active_cpus+0x6b/0x72
[ 131.998051] [<ffffffff810722d0>] cpuset_cpu_active+0x20/0x27
[ 131.998051] [<ffffffff814fbc64>] notifier_call_chain+0x37/0x63
[ 131.998051] [<ffffffff8106b8fa>] __raw_notifier_call_chain+0xe/0x10
[ 131.998051] [<ffffffff8104cc01>] __cpu_notify+0x20/0x32
[ 131.998051] [<ffffffff814ef805>] _cpu_up+0xf7/0x128
[ 131.998051] [<ffffffff814ef905>] cpu_up+0xcf/0xe1
[ 131.998051] [<ffffffff814e01b4>] store_online+0x62/0x90
[ 131.998051] [<ffffffff8130daca>] dev_attr_store+0x20/0x22
[ 131.998051] [<ffffffff811990ab>] sysfs_write_file+0x101/0x13d
[ 131.998051] [<ffffffff8113e9e4>] vfs_write+0xae/0x10a
[ 131.998051] [<ffffffff8113eb03>] sys_write+0x4a/0x71
[ 131.998051] [<ffffffff814ff3a9>] system_call_fastpath+0x16/0x1b
[ 131.998051] Code: e5 41 57 45 31 ff 41 56 41 be 40 00 00 00 41 f7 fe 41 55 48 89 fa 41 89 f5 41
54 45 31 e4 53 48 89 fb 41 89 c6 48 83 ec 08 eb 1a <48> 8b 3a 48 89 55 d0 41 ff c7 e8 b5 ff ff ff 48
8b 55 d0 41 01
[ 131.998051] RIP [<ffffffff81252cd8>] __bitmap_weight+0x31/0x8c
[ 131.998051] RSP <ffff8808408f3bd8>
[ 131.998051] CR2: 0000000000000018
[ 135.827684] ---[ end trace 6df754ed91edd18a ]---



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