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SubjectKVM related crash
From
Have seen multiple crashes on a new Dell Precision T7500 workstation,
seemingly related to KVM:

BUG: unable to handle kernel paging request at 0000000000200200
IP: [<ffffffff8139aab7>] destroy_conntrack+0x82/0x11f
PGD 332d0e067 PUD 33453c067 PMD 0
Oops: 0002 [#1] SMP
last sysfs file: /sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
CPU 4
Modules linked in: tun bridge stp llc sunrpc ipt_MASQUERADE
iptable_nat nf_nat ipt_LOG xt_physdev ip6t_REJECT nf_conntrack_ipv6
ip6table_filter ip6
_tables ipv6 dm_multipath kvm_intel kvm uinput snd_hda_codec_analog
nouveau snd_hda_intel snd_hda_codec ttm drm_kms_helper snd_hwdep
snd_seq drm sn
d_seq_device snd_pcm firewire_ohci i2c_i801 snd_timer ppdev
firewire_core snd i2c_algo_bit iTCO_wdt crc_itu_t parport_pc i2c_core
soundcore parport
iTCO_vendor_support tg3 snd_page_alloc shpchp dcdbas wmi mptsas
mptscsih mptbase scsi_transport_sas megaraid_sas [last_unloaded:
speedstep_lib]
Pid: 1759, comm: qemu-kvm Not tainted 2.6.31.6-162.fc12.x86_64 #1
Precision WorkStation T7500
RIP: 0010:[<ffffffff8139aab7>] [<ffffffff8139aab7>]
destroy_conntrack+0x82/0x11f
RSP: 0018:ffffc90000803bf0 EFLAGS: 00010202
RAX: 0000000080000001 RBX: ffffffff816fb1a0 RCX: 000000000000752f
RDX: 0000000000200200 RSI: 0000000000000011 RDI: ffffffff816fb1a0
RBP: ffffc90000803c00 R08: ffff880336699438 R09: 0000000000aaa5e0
R10: 00000002f54189d5 R11: 0000000000000001 R12: ffffffff819a92e0
R13: ffffffffa029adcc R14: 0000000000000000 R15: ffff880632866c38
FS: 00007fdd34b17710(0000) GS:ffffc90000800000(0000) knlGS:0000000000000000
CS: 0010 DS: 002B ES: 002B CR0: 0000000080050033
CR2: 0000000000200200 CR3: 00000003349c0000 CR4: 00000000000026e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process qemu-kvm (pid: 1759, threadinfo ffff88062e9e8000, task ffff880634945e00)
Stack:
ffff880632866c00 ffff880634640c30 ffffc90000803c10 ffffffff813989c2
<0> ffffc90000803c30 ffffffff81374092 ffffc90000803c30 ffff880632866c00
<0> ffffc90000803c50 ffffffff81373dd3 0000000200000000 ffff880632866c00
Call Trace:
<IRQ>
[<ffffffff813989c2>] nf_conntrack_destroy+0x1b/0x1d
[<ffffffff81374092>] skb_release_head_state+0x95/0xd7
[<ffffffff81373dd3>] __kfree_skb+0x16/0x81
[<ffffffff81373ed7>] kfree_skb+0x6a/0x72
[<ffffffffa029adcc>] ip6_mc_input+0x220/0x230 [ipv6]
[<ffffffffa029a3d1>] ip6_rcv_finish+0x27/0x2b [ipv6]
[<ffffffffa029a763>] ipv6_rcv+0x38e/0x3e5 [ipv6]
[<ffffffff8137bd91>] netif_receive_skb+0x402/0x427
[<ffffffff8137bf1b>] napi_skb_finish+0x29/0x3d
[<ffffffff8137c37a>] napi_gro_receive+0x2f/0x34
[<ffffffffa0084fad>] tg3_poll+0x6c6/0x8c3 [tg3]
[<ffffffff8137c4b0>] net_rx_action+0xaf/0x1c9
[<ffffffff81379cfe>] ? list-add_tail+0x15/0x17
[<ffffffff81057614>] __do_softirq+0xdd/0x1ad
[<ffffffff81026936>] ? apic_write+0x16/0x18
[<ffffffff81012eac>] call_softirq+0x1c/0x30
[<ffffffff810143fb>] do_softirq+0x47/0x8d
[<ffffffff81057326>] irq_exit+0x44/0x86
[<ffffffff8141ecd5>] do_IRQ+0xa5/0xbc
[<ffffffff810126d3>] ret_from_intr+0x0/0x11
<EOI>
[<ffffffffa02437bb>] ? kvm_arch_vcpu_ioctl_run+0x84b/0xb34 [kvm]
[<ffffffffa02437aa>] ? kvm_arch_vcpu_ioctl_run+0x83a/0xb34 [kvm]
[<ffffffffa02395e3>] ? kvm_vcpu_ioctl+0xfd/0x556 [kvm]
[<ffffffff81108adc>] ? vfs_ioctl+0x22/0x87
[<ffffffff81109038>] ? do_vfs_ioctl+0x47b/0x4c1
[<ffffffff811090d4>] ? sys_ioctl+0x56/0x79
[<ffffffff81012093>] ? stub_clone+0x13/0x20
[<ffffffff81011cf2>] ? system_call_fastpath+0x16/0x1b
Code: c7 00 a6 9a 81 e8 23 04 08 00 48 89 df e8 68 29 00 00 f6 43 78
08 75 24 48 8b 53 10 48 85 d2 75 04 0f 0b eb fe 48 8b 43 08 a8 01 <48>
89 02 7
5 04 48 89 50 08 48 c7 43 10 00 02 20 00 65 8b 14 25
RIP [<ffffffff8139aab7>] destroy_conntrack+0x82/0x11f
RSP <ffffc90000803bf0>
CR2: 0000000000200200


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