<1>[7979352.551420] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
<1>[7979352.552746] IP: cpumask_next_and+0x13/0x40
<4>[7979352.554003] PGD 4edaf66067 PUD 68f8cfe067 PMD 0
<4>[7979352.555235] Oops: 0000 [#1] SMP
<4>[7979352.556462] Modules linked in: dummy act_police cls_u32 sch_ingress dccp_diag dccp udp_diag af_packet_diag netlink_diag ipmi_si ipmi_msghandler nf_conntrack_ipv4 nf_defrag_ipv4 ipt_REJECT nf_reject_ipv4 xt_owner netconsole quota_v2 quota_tree overlay xt_nat xt_limit ip6table_nat nf_nat_ipv6 nf_nat veth tcp_diag inet_diag unix_diag ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 nf_log_common xt_LOG nf_conntrack_ipv6 nf_defrag_ipv6 xt_u32 ip6table_raw xt_conntrack ip6table_filter xt_tcpudp xt_CT nf_conntrack iptable_raw xt_multiport iptable_filter ip6_tables ip_tables x_tables bridge cls_cgroup configfs sch_codel sch_htb 8021q mrp garp stp llc intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp ast ttm kvm_intel drm_kms_helper kvm irqbypass drm ghash_clmulni_intel fb_sys_fops sysimgblt sysfillrect syscopyarea sb_edac i2c_algo_bit edac_core 8250_fintek lpc_ich acpi_power_meter acpi_pad mac_hid shpchp ip6_tunnel tunnel6 tcp_htcp mlx4_en ptp pps_core vxlan udp_tunnel ip6_udp_tunnel raid10 raid456 async_raid6_recov async_pq async_xor xor async_memcpy async_tx mlx4_core fjes raid6_pq libcrc32c raid1 raid0 multipath linear [last unloaded: ipmi_ssif]
<4>[7979352.572197] CPU: 50 PID: 601841 Comm: intsearch Tainted: G        W       3.0.4-2-lxcna #2 Supermicro X9DRW/X9DRW
<4>[7979352.573457] Hardware name: AIC 21S-B312-B8/MB-DPHW1R AIDOS-M, BIOS AIDOS037 06/03/2016
<4>[7979352.574688] task: ffff887f6139b600 ti: ffff884092db8000 task.ti: ffff884092db8000
<4>[7979352.575962] RIP: 0010:cpumask_next_and+0x13/0x40
<4>[7979352.577247] RSP: 0018:ffff884092dbb838 EFLAGS: 00010093
<4>[7979352.578441] RAX: 0000000000000000 RBX: ffff884092dbb950 RCX: ffff887f662fa880
<4>[7979352.579626] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000018
<4>[7979352.580817] RBP: ffff884092dbb838 R08: 0000000000000000 R09: 0000000000000000
<4>[7979352.581986] R10: 0000000000000002 R11: afb504000afb5041 R12: 0000000000000018
<4>[7979352.583133] R13: 0000000000016e80 R14: 0000000000000000 R15: ffff884092dbba50
<4>[7979352.584255] FS:  00007f10a85f7700(0000) GS:ffff887f7f380000(0000) knlGS:0000000000000000
<4>[7979352.585399] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[7979352.586512] CR2: 0000000000000018 CR3: 0000004c2c3d6000 CR4: 00000000003606f0
<4>[7979352.587621] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
<4>[7979352.588729] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
<4>[7979352.589787] Call Trace:
<4>[7979352.590827]  find_busiest_group+0x204/0x990
<4>[7979352.591851]  load_balance+0x19c/0x9f0
<4>[7979352.592882]  ? sched_clock+0x9/0x10
<4>[7979352.593868]  pick_next_task_fair+0x2d0/0x520
<4>[7979352.594842]  __schedule+0xf4/0x822
<4>[7979352.595795]  schedule+0x40/0x90
<4>[7979352.596755]  futex_wait_queue_me+0xdb/0x150
<4>[7979352.597684]  futex_wait+0x184/0x270
<4>[7979352.599042]  ? try_to_wake_up+0x54/0x3f0
<4>[7979352.599957]  ? tcp_recvmsg+0x59a/0xb60
<4>[7979352.600835]  do_futex+0x374/0xd10
<4>[7979352.601684]  ? cputime_adjust+0x9f/0x140
<4>[7979352.602516]  ? __might_sleep+0x52/0x90
<4>[7979352.603357]  ? mmput+0x29/0x140
<4>[7979352.604143]  ? __might_sleep+0x52/0x90
<4>[7979352.604924]  ? __might_fault+0x38/0x40
<4>[7979352.605672]  SyS_futex+0x153/0x1a0
<4>[7979352.606405]  entry_SYSCALL_64_fastpath+0x22/0x9d
<4>[7979352.607132] Code: 5c 41 5d 41 5e 31 c0 5d c3 5b 41 5c 41 5d 41 5e b8 01 00 00 00 5d c3 90 55 89 f8 48 89 e5 41 54 49 89 d4 53 48 89 f3 eb 0d 89 c2 <49> 0f a3 14 24 19 d2 85 d2 75 1b 83 c0 01 be 00 01 00 00 48 89
<1>[7979352.608753] RIP: cpumask_next_and+0x13/0x40 RSP: ffff884092dbb838
<4>[7979352.609521] CR2: 0000000000000018
