atom feed1 message in org.kernel.vger.kvmkvm-git: oops in is_largepage_backed
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Jan KiszkaOct 31, 2008 6:21 am 
Subject:kvm-git: oops in is_largepage_backed
From:Jan Kiszka (
Date:Oct 31, 2008 6:21:45 am


during normal use of kvm-userspace ccabb53f1a84f11896c840391f7ade3756214086 with kernel modules from b34cc415c4d1b547d0482f774a81370aecf4fc85 on a 2.6.25 OpenSUSE kernel I just got this oops:

BUG: unable to handle kernel paging request at ffffc20005261808 IP: [<ffffffff8883fcec>] :kvm:is_largepage_backed+0x2f/0xe7 PGD 7f23b067 PUD 7f23c067 PMD 7d7bb067 PTE 0 Oops: 0000 [1] SMP last sysfs file: /sys/devices/system/cpu/cpu1/cache/index2/shared_cpu_map CPU 1 Modules linked in: ath_pci o2scr kvm_intel kvm nfsd lockd nfs_acl auth_rpcgss sunrpc exportfs ip6t_LOG ipt_MASQUERADE xt_pkttype xt_TCPMSS xt_tcpudp ipt_LOG xt_limit snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device wlan_tkip i915 drm af_packet ip6t_REJECT nf_conntrack_ipv6 ipt_REJECT xt_physdev xt_state iptable_mangle iptable_nat nf_nat iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_ipv4 nf_conntrack ip_tables ip6table_filter ip6_tables x_tables ipv6 microcode cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq bridge bnep fuse usbhid hid ff_memless ohci_hcd loop mt2060 rfcomm l2cap dvb_usb_dib0700 dib7000p dib7000m dvb_usb wlan_scan_sta dvb_core snd_hda_intel ath_rate_sample rtc_cmos dib3000mc ppdev pcmcia iTCO_wdt firmware_class rtc_core parport_pc snd_pcm dibx000_common sdhci iTCO_vendor_support parport i2c_i801 hci_usb rtc_lib dib0070 ohci1394 snd_timer snd_page_alloc serio_raw mmc_core ieee1394 i2c_core yenta_socket wlan joydev video snd_hwdep rsrc_nonstatic sg pcmcia_core snd bluetooth output battery soundcore ac button ath_hal(P) intel_agp sky2 sha256_generic aes_x86_64 aes_generic cbc dm_crypt crypto_blkcipher ehci_hcd sd_mod uhci_hcd usbcore dm_snapshot dm_mod edd ext3 mbcache jbd fan ata_piix ahci libata scsi_mod dock thermal processor [last unloaded: ath_pci] Pid: 3043, comm: qemu-system-x86 Tainted: P N #1 RIP: 0010:[<ffffffff8883fcec>] [<ffffffff8883fcec>] :kvm:is_largepage_backed+0x2f/0xe7 RSP: 0018:ffff81000599fa08 EFLAGS: 00010287 RAX: ffffc20005261808 RBX: 0000000000000004 RCX: 0000000000000005 RDX: 00000000000f1000 RSI: ffff81001099c188 RDI: ffffc20005261800 RBP: ffff81000599fa28 R08: 0000000000000021 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000004 R12: 00000000000000a4 R13: ffff81003a378740 R14: ffff81003a378740 R15: ffff81003a379cd0 FS: 0000000041afc950(0000) GS:ffff81007f36ee40(0000) knlGS:0000000000000000 CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b CR2: ffffc20005261808 CR3: 000000003a27b000 CR4: 00000000000026a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process qemu-system-x86 (pid: 3043, threadinfo ffff81000599e000, task ffff81006adc0380) Stack: ffff81000599fa38 0000000000000004 00000000000000a4 ffff81003a378740 ffff81000599fb28 ffffffff888413e9 ffff81000599fa68 ffff81000599faf8 000000000002e561 ffff81003a378740 00000000ef76d004 00000000000003bd Call Trace: [<ffffffff888413e9>] :kvm:kvm_mmu_pte_write+0x124/0x7c6 [<ffffffff88839e8d>] :kvm:emulator_write_phys+0x37/0x47 [<ffffffff8883d121>] :kvm:emulator_write_emulated_onepage+0x71/0xf9 [<ffffffff8883d20e>] :kvm:emulator_write_emulated+0x65/0x71 [<ffffffff88846695>] :kvm:x86_emulate_insn+0x3d39/0x49ca [<ffffffff88839d7b>] :kvm:emulate_instruction+0x199/0x267 [<ffffffff88841288>] :kvm:kvm_mmu_page_fault+0x49/0x86 [<ffffffff88867075>] :kvm_intel:handle_exception+0x184/0x2d9 [<ffffffff888673ba>] :kvm_intel:kvm_handle_exit+0x163/0x185 [<ffffffff8883bcfd>] :kvm:kvm_arch_vcpu_ioctl_run+0x600/0x871 [<ffffffff888354b3>] :kvm:kvm_vcpu_ioctl+0xf6/0x485 [<ffffffff802acada>] vfs_ioctl+0x2a/0x78 [<ffffffff802acd6f>] do_vfs_ioctl+0x247/0x261 [<ffffffff802acdde>] sys_ioctl+0x55/0x77 [<ffffffff8020bffa>] system_call_after_swapgs+0x8a/0x8f [<00007fa121f45b67>]

Code: 41 55 49 89 fd 41 54 49 89 f4 53 48 83 ec 08 48 8b 3f e8 c8 65 ff ff 48 85 c0 48 89 c6 0f 84 b6 00 00 00 4c 89 e7 e8 05 e0 ff ff <83> 38 00 0f 85 a5 00 00 00 49 8b 7d 00 4c 89 e6 e8 28 62 ff ff RIP [<ffffffff8883fcec>] :kvm:is_largepage_backed+0x2f/0xe7 RSP <ffff81000599fa08> CR2: ffffc20005261808 ---[ end trace 5b290f44949eab07 ]---

(kernel tained due to madwifi)

qemu was started like this:

qemu-system-x86_64 <some-32-bit-Linux-image> -m 768 -serial stdio \ -net nic,model=virtio -net user

The guest was copying some files via network onto its disk when the oops happened.

Can anyone make some sense out of it?

Thanks, Jan - who actually has to reboot now :(