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[Launchpad Bug Tracker <905246@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/905246

Title:
  kernel BUG at /build/buildd/linux-3.0.0/arch/x86/kvm/mmu.c:703; RIP:
  0010:[<ffffffffa034b160>] [<ffffffffa034b160>] rmap_remove+0x1a0/0x1c0
  [kvm]

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  After moving to oneiric (3.0 linux kernel) in good number of systems
  we are periodically seeing rcu_sched_state detected stall on CPU. In
  one of the case it was preceeded with this KVM BUG(). Not sure if this
  has correlation with the stall, but the stalls started happening after
  this

  [106643.753653] rmap_remove:  ffff88049a9567f8 1->BUG
  [106643.763707] ------------[ cut here ]------------
  [106643.773585] kernel BUG at /build/buildd/linux-3.0.0/arch/x86/kvm/mmu.c:703!
  [106643.783261] invalid opcode: 0000 [#2] SMP 
  [106643.793054] CPU 1 
  [106643.793198] Modules linked in: ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp vesafb kvm_intel kvm nfs lockd fscache auth_rpcgss nfs_acl sunrpc ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi scst_vdisk iscsi_scst scst libcrc32c dm_iostat dcdbas dm_multipath joydev psmouse serio_raw ghes i7core_edac edac_core acpi_power_meter hed lp parport usbhid hid ses enclosure megaraid_sas bnx2
  [106643.843476] 
  [106643.843478] Pid: 29316, comm: kvm Tainted: G      D W   3.0.0-13-server #22-Ubuntu Dell Inc. PowerEdge R710/00NH4P
  [106643.843483] RIP: 0010:[<ffffffffa034b160>]  [<ffffffffa034b160>] rmap_remove+0x1a0/0x1c0 [kvm]
  [106643.843506] RSP: 0018:ffff88091f815b38  EFLAGS: 00010296
  [106643.843509] RAX: 000000000000003c RBX: ffff88049a9567f8 RCX: 00000000ffffffff
  [106643.843511] RDX: 0000000000000000 RSI: 0000000000000082 RDI: 0000000000000246
  [106643.843514] RBP: ffff88091f815b58 R08: 0000000000000000 R09: 0000000000000000
  [106643.843516] R10: 0000000000005000 R11: 0000000000000001 R12: ffff880920448000
  [106643.843518] R13: ffff88046a734fa0 R14: ffff88046a734fa0 R15: ffffea0000000000
  [106643.843521] FS:  00007f96354817a0(0000) GS:ffff8804bfc00000(0000) knlGS:0000000000000000
  [106643.843525] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  [106643.843527] CR2: 00007f77e4e21000 CR3: 0000000922982000 CR4: 00000000000026e0
  [106643.843532] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  [106643.843535] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
  [106643.843538] Process kvm (pid: 29316, threadinfo ffff88091f814000, task ffff88091fd3dc80)
  [106643.843540] Stack:
  [106643.843542]  000000000000ece0 ffff88049a9567f8 ffff880920448000 ffff880920448000
  [106643.843545]  ffff88091f815b78 ffffffffa034b1b5 ffff88049a9567f8 00000000000000ff
  [106643.843549]  ffff88091f815bb8 ffffffffa034bfc3 ffff88091f815b88 ffff88046a734fa0
  [106643.843552] Call Trace:
  [106643.843567]  [<ffffffffa034b1b5>] drop_spte+0x35/0x40 [kvm]
  [106643.843581]  [<ffffffffa034bfc3>] kvm_mmu_page_unlink_children+0x53/0xf0 [kvm]
  [106643.843596]  [<ffffffffa034c0a9>] kvm_mmu_prepare_zap_page+0x49/0x280 [kvm]
  [106643.843602]  [<ffffffff810b6719>] ? try_stop_cpus+0x59/0x70
  [106643.843615]  [<ffffffffa035351a>] kvm_mmu_zap_all+0x4a/0x90 [kvm]
  [106643.843629]  [<ffffffffa0348696>] kvm_arch_flush_shadow+0x16/0x30 [kvm]
  [106643.843640]  [<ffffffffa0330393>] __kvm_set_memory_region+0x323/0x950 [kvm]
  [106643.843654]  [<ffffffffa035d804>] ? create_pit_timer+0xb4/0xd0 [kvm]
  [106643.843668]  [<ffffffffa035e03b>] ? pit_load_count.isra.10+0xcb/0x110 [kvm]
  [106643.843682]  [<ffffffffa035e438>] ? kvm_pit_load_count+0x28/0x70 [kvm]
  [106643.843693]  [<ffffffffa0330a00>] kvm_set_memory_region+0x40/0x60 [kvm]
  [106643.843704]  [<ffffffffa0331a38>] kvm_vm_ioctl_set_memory_region+0x18/0x20 [kvm]
  [106643.843714]  [<ffffffffa0331c60>] kvm_vm_ioctl+0x220/0x2e0 [kvm]
  [106643.843719]  [<ffffffff811792c9>] do_vfs_ioctl+0x89/0x310
  [106643.843723]  [<ffffffff81097d65>] ? sys_futex+0x105/0x1a0
  [106643.843727]  [<ffffffff811679ed>] ? vfs_read+0x10d/0x180
  [106643.843730]  [<ffffffff811795e1>] sys_ioctl+0x91/0xa0
  [106643.843736]  [<ffffffff81607102>] system_call_fastpath+0x16/0x1b
  [106643.843738] Code: 8b 16 48 89 10 eb b2 48 89 de 48 c7 c7 50 75 36 a0 31 c0 e8 ab d6 29 e1 0f 0b 48 89 de 48 c7 c7 cf 85 36 a0 31 c0 e8 98 d6 29 e1 <0f> 0b 48 89 de 48 c7 c7 b4 85 36 a0 31 c0 e8 85 d6 29 e1 0f 0b 
  [106643.843759] RIP  [<ffffffffa034b160>] rmap_remove+0x1a0/0x1c0 [kvm]
  [106643.843773]  RSP <ffff88091f815b38>
  [106643.870629] ---[ end trace 1df1b3861d030b7c ]---
  [106711.721069] INFO: rcu_sched_state detected stall on CPU 5 (t=15000 jiffies)
  [106711.721081] INFO: rcu_sched_state detected stall on CPU 3 (t=15000 jiffies)
  [106711.721094] INFO: rcu_sched_state detected stall on CPU 0 (t=15000 jiffies)
  [106711.721103] INFO: rcu_sched_state detected stall on CPU 6 (t=15000 jiffies)
  [106711.721112] INFO: rcu_sched_state detected stall on CPU 1 (t=15000 jiffies)
  [106891.478695] INFO: rcu_sched_state detected stall on CPU 3 (t=60030 jiffies)
  [106891.478701] INFO: rcu_sched_state detected stall on CPU 1 (t=60030 jiffies)
  [106891.478707] INFO: rcu_sched_state detected stall on CPU 5 (t=60030 jiffies)
  [107071.236324] INFO: rcu_sched_state detected stall on CPU 2 (t=105060 jiffies)
  [107071.236336] INFO: rcu_sched_state detected stall on CPU 1 (t=105060 jiffies)
  [107250.993951] INFO: rcu_sched_state detected stall on CPU 6 (t=150090 jiffies)

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-3.0.0-13-server 3.0.0-13.22
  ProcVersionSignature: Ubuntu 3.0.0-13.22-server 3.0.6
  Uname: Linux 3.0.0-13-server x86_64
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  CRDA: Error: [Errno 2] No such file or directory
  Date: Fri Dec 16 10:37:00 2011
  HibernationDevice: RESUME=UUID=5d83c5ae-1432-4ed0-be62-0b5bb54d8989
  IwConfig: Error: [Errno 2] No such file or directory
  MachineType: Dell Inc. PowerEdge R710
  PciMultimedia:
   
  ProcEnviron:
   LANGUAGE=en_US:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.0.0-13-server root=UUID=6adff529-7713-48d3-9174-d7e8f7fe5053 ro splash quiet vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-13-server N/A
   linux-backports-modules-3.0.0-13-server  N/A
   linux-firmware                           1.60
  RfKill: Error: [Errno 2] No such file or directory
  SourcePackage: linux
  UpgradeStatus: Upgraded to oneiric on 2011-12-09 (6 days ago)
  dmi.bios.date: 01/31/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 3.0.0
  dmi.board.name: 00NH4P
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A12
  dmi.chassis.type: 23
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr3.0.0:bd01/31/2011:svnDellInc.:pnPowerEdgeR710:pvr:rvnDellInc.:rn00NH4P:rvrA12:cvnDellInc.:ct23:cvr:
  dmi.product.name: PowerEdge R710
  dmi.sys.vendor: Dell Inc.

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