Re: Yet another kernel backtrace pointing at KVM

[Ivelin Ivanov <ivelin.ivanov@sofiacom.bg>]

I am running mix of XP and SuSE 11.1.
I think this one is triggered by Windows XP SP 3, because the VM
rebooted in the same time when the  back-trace  appear in the syslog.
How can I get the latest code ?
Thanks in advance.
Best regards,

Ivelin Ivanov


Gleb Natapov wrote:
> On Sun, Jun 28, 2009 at 10:20:50PM +0300, Ivelin Ivanov wrote:
>   
>> Hello KVM team,
>>
>> I am using KVM for maintaining mixture of Windows and Linux VMs.
>> The kernel version is 2.6.30.
>> I am using the kernel's KVM module and qemu-kvm-0.86.
>>
>>     
> The KVM in 2.6.30 does not handle task switch properly and it hits
> WARN_ON() here. Current KVM tree should handle this better. What
> operation system the guest that triggers this is running? It looks like
> it configures some exception handler (may be #DF) to be a task gate.
>
>   
>> Jun 26 15:23:25 pc187 kernel: ------------[ cut here ]------------
>> Jun 26 15:23:25 pc187 kernel: WARNING: at arch/x86/kvm/x86.c:204
>> kvm_queue_exception_e+0x24/0x45 [kvm]()
>> Jun 26 15:23:25 pc187 kernel: Hardware name: IBM System x3650 -[7979B4G]-
>> Jun 26 15:23:25 pc187 kernel: Modules linked in: 8021q garp tun reiserfs
>> st ide_gd_mod ide_cd_mod bridge stp kvm_intel kvm ipv6 af_packet cpufr
>> eq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq
>> speedstep_lib loop dm_mod i5k_amb ibmpex i5000_edac ibmaem i2c_i801
>> iTCO_wdt i
>> TCO_vendor_support rtc_cmos bnx2 sr_mod rtc_core ipmi_msghandler ses
>> edac_core rtc_lib button pcspkr i2c_core cdrom serio_raw enclosure shpchp
>> pci_hotplug joydev sg usbhid hid uhci_hcd ehci_hcd usbcore sd_mod
>> crc_t10dif edd ext3 mbcache jbd fan ide_pci_generic ide_core ata_generic
>> ata_
>> piix libata thermal processor thermal_sys hwmon aacraid scsi_mod
>> Jun 26 15:23:25 pc187 kernel: Pid: 3452, comm: qemu-system-x86 Tainted:
>> G        W  2.6.30-9-pae #1
>> Jun 26 15:23:25 pc187 kernel: Call Trace:
>> Jun 26 15:23:25 pc187 kernel:  [<c012eda8>] warn_slowpath_common+0x60/0x90
>> Jun 26 15:23:25 pc187 kernel:  [<c012ede5>] warn_slowpath_null+0xd/0x10
>> Jun 26 15:23:25 pc187 kernel:  [<f7fea423>]
>> kvm_queue_exception_e+0x24/0x45 [kvm]
>> Jun 26 15:23:25 pc187 kernel:  [<f7feb509>] kvm_task_switch+0xfb/0xada [kvm]
>> Jun 26 15:23:25 pc187 kernel:  [<f7fec1e5>] ?
>> kvm_inject_page_fault+0x5a/0x5f [kvm]
>> Jun 26 15:23:25 pc187 kernel:  [<f7ff041e>] ?
>> kvm_mmu_page_fault+0x16/0x75 [kvm]
>> Jun 26 15:23:25 pc187 kernel:  [<f805dea3>] handle_task_switch+0x6d/0x96
>> [kvm_intel]
>> Jun 26 15:23:25 pc187 kernel:  [<f805e3fd>] kvm_handle_exit+0x1c3/0x1e0
>> [kvm_intel]
>> Jun 26 15:23:25 pc187 kernel:  [<f805d235>] ?
>> vmx_queue_exception+0xf9/0xfe [kvm_intel]
>> Jun 26 15:23:25 pc187 kernel:  [<f7feb11a>]
>> kvm_arch_vcpu_ioctl_run+0x89d/0xab6 [kvm]
>> Jun 26 15:23:25 pc187 kernel:  [<c01a7cfd>] ? do_sync_readv_writev+0xa1/0xdf
>> Jun 26 15:23:25 pc187 kernel:  [<f7fe34ef>] kvm_vcpu_ioctl+0xec/0x602 [kvm]
>> Jun 26 15:23:25 pc187 kernel:  [<c03441e2>] ? _spin_unlock+0xf/0x23
>> Jun 26 15:23:25 pc187 kernel:  [<c014de53>] ?
>> generic_smp_call_function_single_interrupt+0x6c/0x9e
>> Jun 26 15:23:25 pc187 kernel:  [<c01336e0>] ? irq_exit+0x61/0x63
>> Jun 26 15:23:25 pc187 kernel:  [<c0110005>] ?
>> smp_call_function_single_interrupt+0x2d/0x2f
>> Jun 26 15:23:25 pc187 kernel:  [<c010327a>] ?
>> call_function_single_interrupt+0x2a/0x30
>> Jun 26 15:23:25 pc187 kernel:  [<f7fe3403>] ? kvm_vcpu_ioctl+0x0/0x602 [kvm]
>> Jun 26 15:23:25 pc187 kernel:  [<c01b2fe7>] vfs_ioctl+0x22/0x69
>> Jun 26 15:23:25 pc187 kernel:  [<c01b3467>] do_vfs_ioctl+0x439/0x472
>> Jun 26 15:23:25 pc187 kernel:  [<c0110005>] ?
>> smp_call_function_single_interrupt+0x2d/0x2f
>> Jun 26 15:23:25 pc187 kernel:  [<c010327a>] ?
>> call_function_single_interrupt+0x2a/0x30
>> Jun 26 15:23:25 pc187 kernel:  [<c01a8e52>] ? fget_light+0x8a/0xb1
>> Jun 26 15:23:25 pc187 kernel:  [<c01b34e0>] sys_ioctl+0x40/0x5a
>> Jun 26 15:23:25 pc187 kernel:  [<c0102b0c>] sysenter_do_call+0x12/0x28
>> Jun 26 15:23:25 pc187 kernel: ---[ end trace 9cc5a56b9c7eda33 ]---
>>
>> Here is some more info:
>> # uname -a
>> Linux pc187 2.6.30-9-pae #1 SMP PREEMPT Wed Jun 17 15:29:59 EEST 2009
>> i686 i686 i386 GNU/Linux
>> # qemu-system-x86_64  --version
>> QEMU PC emulator version 0.10.50 (qemu-kvm-devel-86), Copyright (c)
>> 2003-2008 Fabrice Bellard
>> # modinfo /lib/modules/2.6.30-9-pae/kernel/arch/x86/kvm/kvm.ko
>> filename:       /lib/modules/2.6.30-9-pae/kernel/arch/x86/kvm/kvm.ko
>> license:        GPL
>> author:         Qumranet
>> srcversion:     934CD9DB264501B0431438A
>> depends:
>> vermagic:       2.6.30-9-pae SMP preempt mod_unload modversions CORE2
>> parm:           oos_shadow:bool
>> parm:           msi2intx:bool
>>
>> Hope to hear from you soon.
>> Best regards,
>>
>> Ivelin Ivanov
>>
>> P.S. No mini-dumps were found in the WinXP VM
>>
>>
>>
>>
>> --
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>>     
>
> --
> 			Gleb.
>