[Xen-bugs] [Bug 1103] New: Segfault & system hang when using HVM with pciback.hide and real mode call

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1103

           Summary: Segfault & system hang when using HVM with pciback.hide
                    and real mode call
           Product: Xen
           Version: unstable
          Platform: x86
        OS/Version: Linux-2.6
            Status: NEW
          Severity: blocker
          Priority: P2
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: bryan.york@xxxxxxxxx
                CC: bryan.york@xxxxxxxxx


Hello,

I'm running Ubuntu Gutsy Gibbon with a 2.6.22 xen 3.1 kernel and utils. I want
to allocate a SATA controller PCI resource to my HVM DomU. I want to be able to
test hard drives using the manufacturers diagnostics. Qemu emulates the
hardware, and as a result the diagnostic won't work. (It doesn't detect the
controller or Hard Drive.)

I can load the DomU, but it appears as soon as it tries to detect the
controller, it segfaults and then my entire system freezes. From syslog:


Nov  2 11:38:40 byork-dt kernel: [82681.783013] ------------[ cut here
]------------
Nov  2 11:38:40 byork-dt kernel: [82681.783018] kernel BUG at
/build/buildd/linux-source-2.6.22-2.6.22/debian/build/custom-source-xen/arch/i386/mm/hypervisor.c:52!
Nov  2 11:38:40 byork-dt kernel: [82681.783021] invalid opcode: 0000 [#1]
Nov  2 11:38:40 byork-dt kernel: [82681.783023] SMP 
Nov  2 11:38:40 byork-dt kernel: [82681.783026] Modules linked in: loop
af_packet i915 drm rfcomm l2cap bluetooth bridge ppdev ipv6 ac sbs button video
container dock battery sbp2 parport_pc lp parport snd_hda_intel snd_pcm_oss
snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi sr_mod xpad
snd_rawmidi cdrom snd_seq_midi_event snd_seq snd_timer snd_seq_device snd heci
soundcore psmouse e1000_ich9 shpchp pci_hotplug snd_page_alloc serio_raw pcspkr
serial_core intel_agp agpgart joydev evdev ext3 jbd mbcache sg sd_mod usbhid
hid pata_marvell pata_jmicron ohci1394 ieee1394 ahci ehci_hcd uhci_hcd
ata_generic usbcore libata scsi_mod thermal processor fan fuse apparmor
commoncap
Nov  2 11:38:40 byork-dt kernel: [82681.783093] CPU:    1
Nov  2 11:38:40 byork-dt kernel: [82681.783093] EIP:   
0061:[xen_l1_entry_update+160/176]    Not tainted VLI
Nov  2 11:38:40 byork-dt kernel: [82681.783094] EFLAGS: 00010282  
(2.6.22-14-xen #1)
Nov  2 11:38:40 byork-dt kernel: [82681.783100] EIP is at
xen_l1_entry_update+0xa0/0xb0
Nov  2 11:38:40 byork-dt kernel: [82681.783103] eax: ffffffea   ebx: db631c50  
ecx: 00000001   edx: 00000000
Nov  2 11:38:40 byork-dt kernel: [82681.783105] esi: 00007ff0   edi: 00000001  
ebp: 00000000   esp: db631c4c
Nov  2 11:38:40 byork-dt kernel: [82681.783107] ds: 007b   es: 007b   fs: 00d8 
gs: 0000  ss: 0069
Nov  2 11:38:40 byork-dt kernel: [82681.783110] Process bash (pid: 10024,
ti=db630000 task=e528f9f0 task.ti=db630000)
Nov  2 11:38:40 byork-dt kernel: [82681.783112] Stack: 00000000 fffff258
000007ff 00000000 00000000 4e85f025 2bfdc067 00000001 
Nov  2 11:38:40 byork-dt kernel: [82681.783120]        f57e9258 c0160c23
4e85f025 00000000 00000000 00000000 00001000 080eefff 


Please let me know if you need any more information.


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