Just ran into this issue on Ubuntu 16.04: Aug 21 02:49:14 doddering-fransisca kernel: [2532635.918673] divide error: 0000 [#1] SMP Aug 21 02:49:14 doddering-fransisca kernel: [2532635.935386] Modules linked in: bridge stp llc bonding nls_iso8859_1 ipmi_ssif ipmi_devintf dcdbas intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass sb_edac edac_core 8250_fintek ipmi_si ipmi_msghandler mei_me mei lpc_ich shpchp acpi_power_meter mac_hid ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid0 multipath linear raid1 crct10dif_pclmul crc32_pclmul mxm_wmi aesni_intel aes_x86_64 lrw ixgbe i40e gf128mul glue_helper igb ablk_helper vxlan cryptd ip6_udp_tunnel udp_tunnel dca mdio ahci ptp libahci pps_core i2c_algo_bit fjes wmi Aug 21 02:49:14 doddering-fransisca kernel: [2532636.036341] CPU: 20 PID: 95997 Comm: jujud Not tainted 4.4.0-31-generic #50-Ubuntu Aug 21 02:49:14 doddering-fransisca kernel: [2532636.052997] Hardware name: Dell Inc. PowerEdge C6320/082F9M, BIOS 2.0.2 02/16/2016 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.069486] task: ffff883f0cbd9b80 ti: ffff883f5ae5c000 task.ti: ffff883f5ae5c000 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.085837] RIP: 0010:[<ffffffff810b5b6d>] [<ffffffff810b5b6d>] task_numa_find_cpu+0x2cd/0x710 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.102963] RSP: 0000:ffff883f5ae5fbd8 EFLAGS: 00010257 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.118987] RAX: 0000000000000000 RBX: ffff883f5ae5fc78 RCX: 0000000000000414 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.134881] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88547de36200 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.150581] RBP: ffff883f5ae5fc40 R08: 000000000000012a R09: 0000000000075d4a Aug 21 02:49:14 doddering-fransisca kernel: [2532636.166034] R10: 0000000000000084 R11: 000000000003eab1 R12: ffff887c1fc6e040 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.181262] R13: 000000000000001b R14: ffff88547de36200 R15: 000000000000007c Aug 21 02:49:14 doddering-fransisca kernel: [2532636.196284] FS: 00007f0888ff9700(0000) GS:ffff883f7e880000(0000) knlGS:0000000000000000 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.211275] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.225943] CR2: 000000d884976e48 CR3: 0000003f56296000 CR4: 00000000003406e0 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.240452] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.254703] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.268649] Stack: Aug 21 02:49:14 doddering-fransisca kernel: [2532636.282271] 000000000000001d 0000000000000100 000000000000012a 0000000000000414 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.295952] 0000000000000065 00000000000000c3 0000000000016d00 000000000000012a Aug 21 02:49:14 doddering-fransisca kernel: [2532636.309302] ffff883f0cbd9b80 ffff883f5ae5fc78 0000000000000192 00000000000001c1 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.322438] Call Trace: Aug 21 02:49:14 doddering-fransisca kernel: [2532636.335248] [<ffffffff810b63ee>] task_numa_migrate+0x43e/0x9b0 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.347983] [<ffffffff81072755>] ? native_flush_tlb_others+0x65/0x150 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.360511] [<ffffffff810b69d9>] numa_migrate_preferred+0x79/0x80 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.372777] [<ffffffff810baff4>] task_numa_fault+0x7f4/0xd40 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.384811] [<ffffffff810ba665>] ? should_numa_migrate_memory+0x55/0x130 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.396681] [<ffffffff811bffa0>] handle_mm_fault+0xbc0/0x1820 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.408285] [<ffffffff811c4a93>] ? find_vma+0x43/0x70 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.419617] [<ffffffff8106b537>] __do_page_fault+0x197/0x400 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.430724] [<ffffffff8106b7c2>] do_page_fault+0x22/0x30 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.441594] [<ffffffff8182fcb8>] page_fault+0x28/0x30 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.452173] Code: d0 4c 89 f7 e8 95 c7 ff ff 49 8b 84 24 d8 01 00 00 49 8b 76 78 31 d2 49 0f af 86 b0 00 00 00 4c 8b 45 d0 48 8b 4d b0 48 83 c6 01 <48> f7 f6 4c 89 c6 48 89 da 48 8d 3c 01 48 29 c6 e8 de c5 ff ff Aug 21 02:49:14 doddering-fransisca kernel: [2532636.473627] RIP [<ffffffff810b5b6d>] task_numa_find_cpu+0x2cd/0x710 Aug 21 02:49:14 doddering-fransisca kernel: [2532636.483974] RSP <ffff883f5ae5fbd8> Aug 21 02:49:14 doddering-fransisca kernel: [2532636.511555] ---[ end trace f9c3b1b52643e68b ]---
Reboot brought the machine back up with updated kernel version: Linux doddering-fransisca 4.4.0-34-generic #53-Ubuntu SMP Wed Jul 27 16:06:39 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux We will wait for 4.4.0-36. Thanks, Bert -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1568729 Title: divide error: 0000 [#1] SMP in task_numa_migrate - handle_mm_fault Status in linux package in Ubuntu: In Progress Status in linux source package in Xenial: Fix Committed Bug description: While running qemu 2.5 on a trusty host running 4.4.0-15.31~14.04.1 the host system has crashed (load > 200) 3 times in the last 3 days. Always with this stack trace: Apr 9 19:01:09 cnode9.0 kernel: [197071.195577] divide error: 0000 [#1] SMP Apr 9 19:01:09 cnode9.0 kernel: [197071.195633] Modules linked in: vhost_net vhost macvtap macvlan arc4 md4 nls_utf8 ci fs nfnetlink_queue nfnetlink xt_CHECKSUM xt_nat iptable_nat nf_nat_ipv4 xt_NFQUEUE xt_CLASSIFY ip6table_mangle sch_sfq sch_htb veth dccp_diag dccp tcp_diag udp_diag inet_diag unix_diag af_packet_diag netlink_diag ebtable_filter ebtables nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_fil ter ip6_tables iptable_mangle xt_CT iptable_raw xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack iptable_filter ip_tables x_tables dum my bridge stp llc ipmi_ssif ipmi_devintf intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm dcdbas irqbypass crct10dif_p clmul crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd joydev input_leds nf_nat_ftp sb_edac nf_conntrack_ftp e dac_core cdc_ether nf_nat_pptp usbnet nf_conntrack_pptp mii nf_nat_proto_gre lpc_ich nf_nat_sip ioatdma nf_nat nf_conntrack_sip nfsd ipmi_si 8250_fintek nf_conntrack_proto_gre ipmi_msghandler acpi_pad wmi shpchp nf_conntrack acpi_power_meter mac_hid auth_rpcgss nfs_acl bonding nfs lp lockd parport grace sunrpc fscache tcp_htcp xfs btrfs hid_generic usbhid hid raid10 raid456 async_raid6_recov async_memcpy async_pq async_ xor async_tx xor ixgbe raid6_pq libcrc32c igb vxlan raid1 i2c_algo_bit ip6_udp_tunnel dca udp_tunnel ahci raid0 ptp libahci megaraid_sas mult ipath pps_core mdio linear fjes Apr 9 19:01:09 cnode9.0 kernel: [197071.197014] CPU: 13 PID: 3147726 Comm: ceph-osd Not tainted 4.4.0-15-generic #31~14 .04.1-Ubuntu Apr 9 19:01:09 cnode9.0 kernel: [197071.197085] Hardware name: Dell Inc. PowerEdge R720/0XH7F2, BIOS 2.5.2 01/28/2015 Apr 9 19:01:09 cnode9.0 kernel: [197071.197154] task: ffff88252be1ee00 ti: ffff8824fc0d4000 task.ti: ffff8824fc0d4000 Apr 9 19:01:09 cnode9.0 kernel: [197071.197221] RIP: 0010:[<ffffffff810afec8>] [<ffffffff810afec8>] task_numa_find_cpu+0x238/0x700 Apr 9 19:01:09 cnode9.0 kernel: [197071.197300] RSP: 0000:ffff8824fc0d7ba8 EFLAGS: 00010257 Apr 9 19:01:09 cnode9.0 kernel: [197071.197340] RAX: 0000000000000000 RBX: ffff8824fc0d7c48 RCX: 0000000000000000 Apr 9 19:01:09 cnode9.0 kernel: [197071.197406] RDX: 0000000000000000 RSI: ffff88479f180000 RDI: ffff884782a47600 Apr 9 19:01:09 cnode9.0 kernel: [197071.197473] RBP: ffff8824fc0d7c10 R08: 0000000102eea157 R09: 00000000000001a8 Apr 9 19:01:09 cnode9.0 kernel: [197071.197540] R10: 000000000002404b R11: 000000000000023f R12: ffff882380930000 Apr 9 19:01:09 cnode9.0 kernel: [197071.197606] R13: 0000000000000008 R14: 000000000000008c R15: 0000000000000124 Apr 9 19:01:09 cnode9.0 kernel: [197071.197673] FS: 00007f19aab5b700(0000) GS:ffff88479f180000(0000) knlGS:0000000000000000 Apr 9 19:01:09 cnode9.0 kernel: [197071.197741] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Apr 9 19:01:09 cnode9.0 kernel: [197071.197782] CR2: 0000000025469600 CR3: 00000023846bc000 CR4: 00000000000426e0 Apr 9 19:01:09 cnode9.0 kernel: [197071.197848] Stack: Apr 9 19:01:09 cnode9.0 kernel: [197071.197880] ffffffff817425fb ffff8829af3e9e00 00000000000000f6 ffff88252be1ee00 Apr 9 19:01:09 cnode9.0 kernel: [197071.197965] 000000000000008d 0000000000000225 0000000000016d40 000000000000008d Apr 9 19:01:09 cnode9.0 kernel: [197071.198047] ffff88252be1ee00 00000000000001ad ffff8824fc0d7c48 00000000000000e1 Apr 9 19:01:09 cnode9.0 kernel: [197071.198132] Call Trace: Apr 9 19:01:09 cnode9.0 kernel: [197071.198172] [<ffffffff817425fb>] ? tcp_schedule_loss_probe+0x12b/0x1b0 Apr 9 19:01:09 cnode9.0 kernel: [197071.198219] [<ffffffff810b0830>] task_numa_migrate+0x4a0/0x930 Apr 9 19:01:09 cnode9.0 kernel: [197071.198264] [<ffffffff816d2957>] ? release_sock+0x117/0x160 Apr 9 19:01:09 cnode9.0 kernel: [197071.198306] [<ffffffff810b0d39>] numa_migrate_preferred+0x79/0x80 Apr 9 19:01:09 cnode9.0 kernel: [197071.198350] [<ffffffff810b557d>] task_numa_fault+0x91d/0xcc0 Apr 9 19:01:09 cnode9.0 kernel: [197071.198395] [<ffffffff811d35ae>] ? mpol_misplaced+0x14e/0x190 Apr 9 19:01:09 cnode9.0 kernel: [197071.198439] [<ffffffff811b06b8>] handle_pte_fault+0x5a8/0x14c0 Apr 9 19:01:09 cnode9.0 kernel: [197071.198485] [<ffffffff810f8531>] ? futex_wake+0x81/0x150 Apr 9 19:01:09 cnode9.0 kernel: [197071.198526] [<ffffffff810b0de4>] ? set_next_entity+0xa4/0x700 Apr 9 19:01:09 cnode9.0 kernel: [197071.198569] [<ffffffff810fab44>] ? do_futex+0xf4/0x4d0 Apr 9 19:01:09 cnode9.0 kernel: [197071.198610] [<ffffffff811b2440>] handle_mm_fault+0x250/0x540 Apr 9 19:01:09 cnode9.0 kernel: [197071.198654] [<ffffffff81067d19>] __do_page_fault+0x199/0x430 Apr 9 19:01:09 cnode9.0 kernel: [197071.198696] [<ffffffff81067fd2>] do_page_fault+0x22/0x30 Apr 9 19:01:09 cnode9.0 kernel: [197071.198740] [<ffffffff817ef878>] page_fault+0x28/0x30 Apr 9 19:01:09 cnode9.0 kernel: [197071.198775] Code: 4d b0 4c 89 f7 e8 29 d5 ff ff 48 8b 4d b0 49 8b 86 b0 00 00 00 31 d2 48 0f af 81 d8 01 00 00 49 8b 4e 78 4c 8b 73 78 48 83 c1 01 <48> f7 f1 48 8b 4b 20 49 89 c1 48 29 c1 4c 03 4b 48 4c 39 7d d0 Apr 9 19:01:09 cnode9.0 kernel: [197071.199217] RIP [<ffffffff810afec8>] task_numa_find_cpu+0x238/0x700 Apr 9 19:01:09 cnode9.0 kernel: [197071.199264] RSP <ffff8824fc0d7ba8> Apr 9 19:01:09 cnode9.0 kernel: [197071.199900] ---[ end trace e938a840610a79f7 ]--- This is appears to be the same bug as reported upstream in http://lkml.iu.edu/hypermail/linux/kernel/1603.2/01659.html According to this thread the issue is: 27: 48 83 c1 01 add $0x1,%rcx 2b:* 48 f7 f1 div %rcx <-- trapping instruction This suggests the CONFIG_FAIR_GROUP_SCHED version of task_h_load: update_cfs_rq_h_load(cfs_rq); return div64_ul(p->se.avg.load_avg * cfs_rq->h_load, cfs_rq_load_avg(cfs_rq) + 1); So the load avg is -1, thus after adding 1 we get division by 0 The fix of the LKML reporter was to include the patches to kernel/sched/fair.c up to 4.5 A specific patch was not identified. Please backport these patches for Xenial and lts-xenial kernel in trusty. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1568729/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
