------- Comment on attachment From sathe...@in.ibm.com 2017-04-07 05:36 EDT-------
Am able to hit the issue with 4.10.0-18-generic #uname -a Linux xxx 4.10.0-18-generic #20-Ubuntu SMP Wed Apr 5 17:17:06 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux System becomes non-responsive, tried sosreport it could not and hit traces, # sosreport [45667.573198] INFO: rcu_sched self-detected stall on CPU [45667.573273] 40-...: (5708015 ticks this GP) idle=fb9/140000000000001/0 softirq=427145/427152 fqs=2849867 [45667.573287] (t=5708055 jiffies g=269170 c=269169 q=847028) [45667.573355] Task dump for CPU 32: [45667.573393] numad R running task 0 2709 1 0x00042004 [45667.573467] Call Trace: [45667.573494] [c000000002e17560] [c0000007edf388b8] 0xc0000007edf388b8 (unreliable) [45667.573569] Task dump for CPU 40: [45667.573607] CPU 0/KVM R running task 0 44171 1 0x00042004 [45667.573681] Call Trace: [45667.573709] [c0000007e9ce2fc0] [c00000000011eb1c] sched_show_task+0xcc/0x150 (unreliable) [45667.573784] [c0000007e9ce3030] [c000000000b5b798] rcu_dump_cpu_stacks+0xec/0x120 [45667.573859] [c0000007e9ce3080] [c00000000016d5b0] rcu_check_callbacks+0x930/0xb30 [45667.573935] [c0000007e9ce31b0] [c000000000176dd8] update_process_times+0x48/0x90 [45667.574010] [c0000007e9ce31e0] [c00000000018e2d0] tick_sched_handle.isra.7+0x30/0xb0 [45667.574085] [c0000007e9ce3210] [c00000000018e3b4] tick_sched_timer+0x64/0xd0 [45667.574160] [c0000007e9ce3250] [c0000000001779e4] __hrtimer_run_queues+0x124/0x420 [45667.574234] [c0000007e9ce32e0] [c000000000178918] hrtimer_interrupt+0xf8/0x330 [45667.574310] [c0000007e9ce33b0] [c000000000023e8c] __timer_interrupt+0x8c/0x270 [45667.574386] [c0000007e9ce3400] [c00000000002428c] timer_interrupt+0x9c/0xe0 [45667.574449] [c0000007e9ce3430] [c0000000000090a4] decrementer_common+0x114/0x120 [45667.574526] --- interrupt: 901 at _raw_spin_lock+0x74/0xe0 [45667.574526] LR = follow_page_pte+0x120/0x830 [45667.574625] [c0000007e9ce3720] [8010018000000000] 0x8010018000000000 (unreliable) [45667.574701] [c0000007e9ce3750] [c0000000002b4250] follow_page_pte+0x120/0x830 [45667.574776] [c0000007e9ce37e0] [c0000000002b54fc] __get_user_pages+0x10c/0x4e0 [45667.574851] [c0000007e9ce3890] [c0000000002b5c64] get_user_pages_unlocked+0xf4/0x280 [45667.574927] [c0000007e9ce3930] [c0000000002b6e2c] get_user_pages_fast+0xac/0x100 [45667.575004] [c0000007e9ce3980] [d00000000f62d074] kvmppc_book3s_hv_page_fault+0x2bc/0xbc0 [kvm_hv] [45667.575093] [c0000007e9ce3a70] [d00000000f629a30] kvmppc_vcpu_run_hv+0xbc8/0x1220 [kvm_hv] [45667.575174] [c0000007e9ce3b80] [d00000000f5932bc] kvmppc_vcpu_run+0x34/0x48 [kvm] [45667.575254] [c0000007e9ce3ba0] [d00000000f59036c] kvm_arch_vcpu_ioctl_run+0x64/0x170 [kvm] [45667.575333] [c0000007e9ce3be0] [d00000000f583db8] kvm_vcpu_ioctl+0x500/0x780 [kvm] [45667.575409] [c0000007e9ce3d40] [c00000000035c674] do_vfs_ioctl+0xd4/0x8c0 [45667.575473] [c0000007e9ce3de0] [c00000000035cf34] SyS_ioctl+0xd4/0xf0 [45667.575537] [c0000007e9ce3e30] [c00000000000b184] system_call+0x38/0xe0 [45667.575599] Task dump for CPU 48: [45667.575636] CPU 28/KVM R running task 0 44199 1 0x00042004 [45667.575711] Call Trace: [45667.575737] [c0000007e9cab720] [c0000007e9cab900] 0xc0000007e9cab900 (unreliable) [45667.575813] [c0000007e9cab750] [c0000000002b4250] follow_page_pte+0x120/0x830 [45667.575888] [c0000007e9cab7e0] [c0000000002b54fc] __get_user_pages+0x10c/0x4e0 [45667.575964] [c0000007e9cab890] [c0000000002b5c64] get_user_pages_unlocked+0xf4/0x280 [45667.576039] [c0000007e9cab930] [c0000000002b6e2c] get_user_pages_fast+0xac/0x100 [45667.576116] [c0000007e9cab980] [d00000000f62d074] kvmppc_book3s_hv_page_fault+0x2bc/0xbc0 [kvm_hv] [45667.576205] [c0000007e9caba70] [d00000000f629a30] kvmppc_vcpu_run_hv+0xbc8/0x1220 [kvm_hv] [45667.576287] [c0000007e9cabb80] [d00000000f5932bc] kvmppc_vcpu_run+0x34/0x48 [kvm] [45667.576368] [c0000007e9cabba0] [d00000000f59036c] kvm_arch_vcpu_ioctl_run+0x64/0x170 [kvm] [45667.576448] [c0000007e9cabbe0] [d00000000f583db8] kvm_vcpu_ioctl+0x500/0x780 [kvm] [45667.576524] [c0000007e9cabd40] [c00000000035c674] do_vfs_ioctl+0xd4/0x8c0 [45667.576628] [c0000007e9cabde0] [c00000000035cf34] SyS_ioctl+0xd4/0xf0 [45667.576743] [c0000007e9cabe30] [c00000000000b184] system_call+0x38/0xe0 ** Attachment added: "dmesg" https://bugs.launchpad.net/bugs/1680390/+attachment/4857151/+files/ubuntu1704-dmesg.txt -- 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/1680390 Title: Ubuntu17.04: Kernel Oops: Exception in kernel mode, sig: 5 [#1] during Avocado KVM Test runs [Regression] Status in linux package in Ubuntu: New Bug description: == Comment: #0 - Satheesh Rajendran <sathe...@in.ibm.com> - 2017-03-27 12:30:45 == ---Problem Description--- Kernel hit with oops while running avocado(kvm) tests "Oops: Exception in kernel mode, sig: 5 [#1]" Contact Information = sathe...@in.ibm.com ---uname output--- Linux ltc-test-ci1 4.10.0-14-generic #16-Ubuntu SMP Fri Mar 17 15:19:05 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux Machine Type = power 8 ppc64le ---Debugger--- A debugger is not configured ---Steps to Reproduce--- 1. Run Avocado(kvm) tests #git clone git://git.linux.ibm.com/ltc-test/avocado-fvt-wrapper.git;cd avocado-fvt-wrapper #python avocado-setup.py --bootstrap --run-suite guest_cpu --guest-os Ubuntu.16.04.2.ppc64le --only-filter virtio_scsi virtio_net qcow2 2. After sometime the below mentioned traces were seen. Stack trace output: [20751.909458] ------------[ cut here ]------------ [20751.909461] kernel BUG at /build/linux-HLNhAK/linux-4.10.0/include/linux/swapops.h:129! [20751.909542] Oops: Exception in kernel mode, sig: 5 [#1] [20751.909549] SMP NR_CPUS=2048 [20751.909549] NUMA [20751.909555] PowerNV [20751.909583] Modules linked in: vhost_net macvtap macvlan xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 kvm_hv kvm_pr kvm tcm_fc libfc usb_f_tcm tcm_usb_gadget libcomposite udc_core tcm_qla2xxx qla2xxx scsi_transport_fc ib_srpt iscsi_target_mod tcm_loop vhost_scsi vhost target_core_user target_core_file target_core_iblock target_core_pscsi target_core_mod ipt_REJECT nf_reject_ipv4 xt_tcpudp ip6t_REJECT nf_reject_ipv6 xt_conntrack ip6t_rpfilter ip_set nfnetlink ebtable_broute bridge stp llc ebtable_nat ip6table_security ip6table_mangle ip6table_raw ip6table_nat iptable_security iptable_mangle iptable_raw iptable_nat ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter openvswitch nf_conntrack_ipv6 nf_nat_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_defrag_ipv6 nf_nat nf_conntrack [20751.910225] binfmt_misc powernv_rng powernv_op_panel ipmi_powernv ipmi_devintf ipmi_msghandler uio_pdrv_genirq uio leds_powernv vmx_crypto ib_iser rdma_cm iw_cm ib_cm ib_core nfsd auth_rpcgss nfs_acl lockd grace configfs iscsi_tcp libiscsi_tcp sunrpc libiscsi scsi_transport_iscsi ip_tables x_tables autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear ses enclosure scsi_transport_sas crc32c_vpmsum tg3 ipr [20751.910629] CPU: 24 PID: 6926 Comm: CPU 24/KVM Not tainted 4.10.0-14-generic #16-Ubuntu [20751.910700] task: c0000007b29ac000 task.stack: c0000007f07b8000 [20751.910759] NIP: c00000000030d748 LR: c00000000030d658 CTR: 0000000000000000 [20751.910828] REGS: c0000007f07bb3b0 TRAP: 0700 Not tainted (4.10.0-14-generic) [20751.910897] MSR: 9000000000029033 <SF,HV,EE,ME,IR,DR,RI,LE> [20751.910903] CR: 44882882 XER: 00000000 [20751.910984] CFAR: c00000000030d884 SOFTE: 1 GPR00: c00000000030d658 c0000007f07bb630 c00000000144c900 f000000001f9f1f0 GPR04: c0000007e7c7e0e0 f000000001f9f1f0 000000001f001c61 00000000611c001f GPR08: c0000000015bc900 0000000000000001 0000000000000001 0000000000e0c7e7 GPR12: 0000000000002200 c00000000fb8d800 0000000000000000 000000000007fe1d GPR16: 0000000000010000 00003fff121c0000 0000000000000000 0000000088000000 GPR20: 0000000020000000 0000000088000000 0000000022000000 c000000004990000 GPR24: c0000000015be3d8 c0000007f05d3700 c0000007b972c030 0000000000000000 GPR28: c0000007f07bb710 3e000000000d611c f000000003584700 f000000001f9f1f0 [20751.911580] NIP [c00000000030d748] __migration_entry_wait+0x128/0x2a0 [20751.911639] LR [c00000000030d658] __migration_entry_wait+0x38/0x2a0 [20751.911697] Call Trace: [20751.911722] [c0000007f07bb630] [c00000000030d658] __migration_entry_wait+0x38/0x2a0 (unreliable) [20751.911807] [c0000007f07bb670] [c0000000002bbc6c] do_swap_page+0x73c/0x9a0 [20751.911866] [c0000007f07bb6f0] [c0000000002bfa98] handle_mm_fault+0xac8/0x1600 [20751.911937] [c0000007f07bb7e0] [c0000000002b4104] __get_user_pages+0x194/0x4e0 [20751.912008] [c0000007f07bb890] [c0000000002b47e4] get_user_pages_unlocked+0xf4/0x280 [20751.912079] [c0000007f07bb930] [c0000000002b59ac] get_user_pages_fast+0xac/0x100 [20751.912152] [c0000007f07bb980] [d00000000f66ca74] kvmppc_book3s_hv_page_fault+0x2bc/0xbb0 [kvm_hv] [20751.912236] [c0000007f07bba70] [d00000000f6696f8] kvmppc_vcpu_run_hv+0xe60/0x1220 [kvm_hv] [20751.912312] [c0000007f07bbb80] [d00000000f6131ac] kvmppc_vcpu_run+0x34/0x48 [kvm] [20751.912387] [c0000007f07bbba0] [d00000000f61030c] kvm_arch_vcpu_ioctl_run+0x64/0x170 [kvm] [20751.912462] [c0000007f07bbbe0] [d00000000f603db8] kvm_vcpu_ioctl+0x500/0x780 [kvm] [20751.912534] [c0000007f07bbd40] [c00000000035b1f4] do_vfs_ioctl+0xd4/0x8c0 [20751.912594] [c0000007f07bbde0] [c00000000035bab4] SyS_ioctl+0xd4/0xf0 [20751.912654] [c0000007f07bbe30] [c00000000000b184] system_call+0x38/0xe0 [20751.912713] Instruction dump: [20751.912749] 3d020017 79293448 39481a68 ebca0000 7fde4a14 e93e0020 712a0001 4082014c [20751.912822] 7fc9f378 e9290000 7d2948f8 792907e0 <0b090000> 39400000 3bbe001c 39000001 [20751.912899] ---[ end trace 5eaae2f83c5daa20 ]--- System Dump Info: The system is not configured to capture a system dump. == Comment: #3 - IRANNA D. ANKAD <iranna.an...@in.ibm.com> - 2017-03-28 01:50:15 == This is a regression from 4.10.0-13 kernel and blocking our regression tetsing == Comment: #10 - VIPIN K. PARASHAR <vipar...@in.ibm.com> - 2017-03-30 03:44:13 == root@ltc-test-ci1:~# uname -a Linux ltc-test-ci1 4.10.0-15-generic #17-Ubuntu SMP Fri Mar 24 17:50:37 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux root@ltc-test-ci1:~# cat /etc/os-release NAME="Ubuntu" VERSION="17.04 (Zesty Zapus)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu Zesty Zapus (development branch)" VERSION_ID="17.04" HOME_URL="https://www.ubuntu.com/"; SUPPORT_URL="https://help.ubuntu.com/"; BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"; PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"; VERSION_CODENAME=zesty UBUNTU_CODENAME=zesty root@ltc-test-ci1:~# tail /proc/cpuinfo processor : 79 cpu : POWER8E (raw), altivec supported clock : 2061.000000MHz revision : 2.1 (pvr 004b 0201) timebase : 512000000 platform : PowerNV model : 8247-21L machine : PowerNV 8247-21L firmware : OPAL root@ltc-test-ci1:~# == Comment: #11 - VIPIN K. PARASHAR <vipar...@in.ibm.com> - 2017-03-30 03:58:04 == Mar 24 07:15:57 =========== [ 1955.041619] ------------[ cut here ]------------ [ 1955.041623] kernel BUG at /build/linux-HLNhAK/linux-4.10.0/include/linux/swapops.h:129! [ 1955.041633] Oops: Exception in kernel mode, sig: 5 [#1] [ 1955.041637] SMP NR_CPUS=2048 [ 1955.041638] NUMA [ 1955.041641] PowerNV [ 1955.041645] Modules linked in: vhost_net macvtap macvlan rpcsec_gss_krb5 nfsv4 nfs fscache xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 kvm_hv kvm_pr kvm tcm_fc libfc usb_f_tcm tcm_usb_gadget libcomposite udc_core tcm_qla2xxx qla2xxx scsi_transport_fc ib_srpt iscsi_target_mod tcm_loop vhost_scsi vhost target_core_user target_core_file target_core_iblock target_core_pscsi target_core_mod ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_tcpudp ipt_REJECT nf_reject_ipv4 xt_conntrack ip_set nfnetlink ebtable_broute bridge stp llc ebtable_nat ip6table_raw ip6table_security ip6table_mangle ip6table_nat iptable_raw iptable_security iptable_mangle iptable_nat ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter openvswitch nf_conntrack_ipv6 nf_nat_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 [ 1955.041724] nf_defrag_ipv6 nf_nat nf_conntrack binfmt_misc powernv_rng powernv_op_panel ipmi_powernv ipmi_devintf ipmi_msghandler leds_powernv uio_pdrv_genirq uio vmx_crypto nfsd auth_rpcgss nfs_acl lockd grace sunrpc ib_iser rdma_cm iw_cm ib_cm ib_core configfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear ses enclosure scsi_transport_sas crc32c_vpmsum tg3 ipr [ 1955.041786] CPU: 40 PID: 7306 Comm: CPU 13/KVM Not tainted 4.10.0-14-generic #16-Ubuntu [ 1955.041792] task: c0000007937b5a00 task.stack: c0000007f2a48000 [ 1955.041796] NIP: c00000000030d748 LR: c00000000030d658 CTR: 0000000000000000 [ 1955.041801] REGS: c0000007f2a4b3b0 TRAP: 0700 Not tainted (4.10.0-14-generic) [ 1955.041805] MSR: 900000000282b033 <SF,HV,VEC,VSX,EE,FP,ME,IR,DR,RI,LE> [ 1955.041813] CR: 44882882 XER: 00000000 [ 1955.041819] CFAR: c00000000030d884 SOFTE: 1 [ 1955.041819] GPR00: c00000000030d658 c0000007f2a4b630 c00000000144c900 f000000001fb8b30 [ 1955.041819] GPR04: c0000007ee2cd2c8 f000000001fb8b30 000000001f005977 000000007759001f [ 1955.041819] GPR08: c0000000015bc900 0000000000000001 0000000000000001 0000000000d02cee [ 1955.041819] GPR12: 0000000000002200 c00000000fb96800 0000000000000000 000000000000005a [ 1955.041819] GPR16: 0000000000010000 00003ffe30590000 0000000000000000 0000000088000000 [ 1955.041819] GPR20: 0000000020000000 0000000088000000 0000000022000000 c0000000fd3d0000 [ 1955.041819] GPR24: c0000000015be3d8 c0000007c3c66880 c0000007ed9b40d8 0000000000000000 [ 1955.041819] GPR28: c0000007f2a4b710 3e00000000077759 f000000001ddd640 f000000001fb8b30 [ 1955.041874] NIP [c00000000030d748] __migration_entry_wait+0x128/0x2a0 [ 1955.041879] LR [c00000000030d658] __migration_entry_wait+0x38/0x2a0 [ 1955.041883] Call Trace: [ 1955.041886] [c0000007f2a4b630] [c00000000030d658] __migration_entry_wait+0x38/0x2a0 (unreliable) [ 1955.041894] [c0000007f2a4b670] [c0000000002bbc6c] do_swap_page+0x73c/0x9a0 [ 1955.041900] [c0000007f2a4b6f0] [c0000000002bfa98] handle_mm_fault+0xac8/0x1600 [ 1955.041906] [c0000007f2a4b7e0] [c0000000002b4104] __get_user_pages+0x194/0x4e0 [ 1955.041912] [c0000007f2a4b890] [c0000000002b47e4] get_user_pages_unlocked+0xf4/0x280 [ 1955.041918] [c0000007f2a4b930] [c0000000002b59ac] get_user_pages_fast+0xac/0x100 [ 1955.041927] [c0000007f2a4b980] [d00000000f7aca74] kvmppc_book3s_hv_page_fault+0x2bc/0xbb0 [kvm_hv] [ 1955.041935] [c0000007f2a4ba70] [d00000000f7a96f8] kvmppc_vcpu_run_hv+0xe60/0x1220 [kvm_hv] [ 1955.041947] [c0000007f2a4bb80] [d00000000f7531ac] kvmppc_vcpu_run+0x34/0x48 [kvm] [ 1955.041958] [c0000007f2a4bba0] [d00000000f75030c] kvm_arch_vcpu_ioctl_run+0x64/0x170 [kvm] [ 1955.041967] [c0000007f2a4bbe0] [d00000000f743db8] kvm_vcpu_ioctl+0x500/0x780 [kvm] [ 1955.041974] [c0000007f2a4bd40] [c00000000035b1f4] do_vfs_ioctl+0xd4/0x8c0 [ 1955.041980] [c0000007f2a4bde0] [c00000000035bab4] SyS_ioctl+0xd4/0xf0 [ 1955.041986] [c0000007f2a4be30] [c00000000000b184] system_call+0x38/0xe0 [ 1955.041990] Instruction dump: [ 1955.041994] 3d020017 79293448 39481a68 ebca0000 7fde4a14 e93e0020 712a0001 4082014c [ 1955.042003] 7fc9f378 e9290000 7d2948f8 792907e0 <0b090000> 39400000 3bbe001c 39000001 [ 1955.042016] ---[ end trace 1c0e9a056f95491f ]--- Mar 27 11:54:27 ============ [20751.909458] ------------[ cut here ]------------ [20751.909461] kernel BUG at /build/linux-HLNhAK/linux-4.10.0/include/linux/swapops.h:129! [20751.909542] Oops: Exception in kernel mode, sig: 5 [#1] [20751.909549] SMP NR_CPUS=2048 [20751.909549] NUMA [20751.909555] PowerNV [20751.909583] Modules linked in: vhost_net macvtap macvlan xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 kvm_hv kvm_pr kvm tcm_fc libfc usb_f_tcm tcm_usb_gadget libcomposite udc_core tcm_qla2xxx qla2xxx scsi_transport_fc ib_srpt iscsi_target_mod tcm_loop vhost_scsi vhost target_core_user target_core_file target_core_iblock target_core_pscsi target_core_mod ipt_REJECT nf_reject_ipv4 xt_tcpudp ip6t_REJECT nf_reject_ipv6 xt_conntrack ip6t_rpfilter ip_set nfnetlink ebtable_broute bridge stp llc ebtable_nat ip6table_security ip6table_mangle ip6table_raw ip6table_nat iptable_security iptable_mangle iptable_raw iptable_nat ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter openvswitch nf_conntrack_ipv6 nf_nat_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_defrag_ipv6 nf_nat nf_conntrack [20751.910225] binfmt_misc powernv_rng powernv_op_panel ipmi_powernv ipmi_devintf ipmi_msghandler uio_pdrv_genirq uio leds_powernv vmx_crypto ib_iser rdma_cm iw_cm ib_cm ib_core nfsd auth_rpcgss nfs_acl lockd grace configfs iscsi_tcp libiscsi_tcp sunrpc libiscsi scsi_transport_iscsi ip_tables x_tables autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear ses enclosure scsi_transport_sas crc32c_vpmsum tg3 ipr [20751.910629] CPU: 24 PID: 6926 Comm: CPU 24/KVM Not tainted 4.10.0-14-generic #16-Ubuntu [20751.910700] task: c0000007b29ac000 task.stack: c0000007f07b8000 [20751.910759] NIP: c00000000030d748 LR: c00000000030d658 CTR: 0000000000000000 [20751.910828] REGS: c0000007f07bb3b0 TRAP: 0700 Not tainted (4.10.0-14-generic) [20751.910897] MSR: 9000000000029033 <SF,HV,EE,ME,IR,DR,RI,LE> [20751.910903] CR: 44882882 XER: 00000000 [20751.910984] CFAR: c00000000030d884 SOFTE: 1 [20751.910984] GPR00: c00000000030d658 c0000007f07bb630 c00000000144c900 f000000001f9f1f0 [20751.910984] GPR04: c0000007e7c7e0e0 f000000001f9f1f0 000000001f001c61 00000000611c001f [20751.910984] GPR08: c0000000015bc900 0000000000000001 0000000000000001 0000000000e0c7e7 [20751.910984] GPR12: 0000000000002200 c00000000fb8d800 0000000000000000 000000000007fe1d [20751.910984] GPR16: 0000000000010000 00003fff121c0000 0000000000000000 0000000088000000 [20751.910984] GPR20: 0000000020000000 0000000088000000 0000000022000000 c000000004990000 [20751.910984] GPR24: c0000000015be3d8 c0000007f05d3700 c0000007b972c030 0000000000000000 [20751.910984] GPR28: c0000007f07bb710 3e000000000d611c f000000003584700 f000000001f9f1f0 [20751.911580] NIP [c00000000030d748] __migration_entry_wait+0x128/0x2a0 [20751.911639] LR [c00000000030d658] __migration_entry_wait+0x38/0x2a0 [20751.911697] Call Trace: [20751.911722] [c0000007f07bb630] [c00000000030d658] __migration_entry_wait+0x38/0x2a0 (unreliable) [20751.911807] [c0000007f07bb670] [c0000000002bbc6c] do_swap_page+0x73c/0x9a0 [20751.911866] [c0000007f07bb6f0] [c0000000002bfa98] handle_mm_fault+0xac8/0x1600 [20751.911937] [c0000007f07bb7e0] [c0000000002b4104] __get_user_pages+0x194/0x4e0 [20751.912008] [c0000007f07bb890] [c0000000002b47e4] get_user_pages_unlocked+0xf4/0x280 [20751.912079] [c0000007f07bb930] [c0000000002b59ac] get_user_pages_fast+0xac/0x100 [20751.912152] [c0000007f07bb980] [d00000000f66ca74] kvmppc_book3s_hv_page_fault+0x2bc/0xbb0 [kvm_hv] [20751.912236] [c0000007f07bba70] [d00000000f6696f8] kvmppc_vcpu_run_hv+0xe60/0x1220 [kvm_hv] [20751.912312] [c0000007f07bbb80] [d00000000f6131ac] kvmppc_vcpu_run+0x34/0x48 [kvm] [20751.912387] [c0000007f07bbba0] [d00000000f61030c] kvm_arch_vcpu_ioctl_run+0x64/0x170 [kvm] [20751.912462] [c0000007f07bbbe0] [d00000000f603db8] kvm_vcpu_ioctl+0x500/0x780 [kvm] [20751.912534] [c0000007f07bbd40] [c00000000035b1f4] do_vfs_ioctl+0xd4/0x8c0 [20751.912594] [c0000007f07bbde0] [c00000000035bab4] SyS_ioctl+0xd4/0xf0 [20751.912654] [c0000007f07bbe30] [c00000000000b184] system_call+0x38/0xe0 [20751.912713] Instruction dump: [20751.912749] 3d020017 79293448 39481a68 ebca0000 7fde4a14 e93e0020 712a0001 4082014c [20751.912822] 7fc9f378 e9290000 7d2948f8 792907e0 <0b090000> 39400000 3bbe001c 39000001 [20751.912899] ---[ end trace 5eaae2f83c5daa20 ]--- As pasted above, two instances of Oops are seen in kernel logs. == Comment: #15 - VIPIN K. PARASHAR <vipar...@in.ibm.com> - 2017-03-30 11:34:06 == From Linux source ============ /* * Something used the pte of a page under migration. We need to * get to the page and wait until migration is finished. * When we return from this function the fault will be retried. */ void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep, spinlock_t *ptl) { .. .. page = migration_entry_to_page(entry); static inline struct page *migration_entry_to_page(swp_entry_t entry) { struct page *p = pfn_to_page(swp_offset(entry)); /* * Any use of migration entries may only occur while the * corresponding page is locked */ BUG_ON(!PageLocked(p)); <------ Oops here return p; } Kernel Oops is getting invoked, due to hitting a BUG_ON in kernel, while servicing KVM ioctl and subsequent page fault with pages being migrated. Same issue has been noticed on intel as well https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1677057 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1680390/+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
