[vfio-users] "BUG: unable to handle kernel NULL pointer dereference at 00000000000000a8"

[Will Marler]

Thanks Nick.

The kernel does not appear to be *entirely* broken for vfio. I figured out
that if I didn't pass a specific PCI card to my guest, the guest would
start. So VGA passthrough is still working; the device that breaks the
kernel (for me anyway) is a PCI USB adapter.

On Fri, Feb 23, 2018 at 7:32 PM, Brett Peckinpaugh <bp10 at erylflynn.com>
wrote:

> So is the entire 4.15 kernel broken for vfio?
>
> On February 23, 2018 6:15:38 PM PST, Nick Sarnie <commendsarnex at gmail.com>
> wrote:
>>
>> On Fri, Feb 23, 2018 at 6:04 PM, Will Marler <will at wmarler.com> wrote:
>>
>>>  I'm running Arch and updating recently has caused my VM to stop booting.
>>>
>>>  Watching journalctl I see this when I try to start the VM:
>>>
>>>  "Feb 23 15:04:07 haze kernel: BUG: unable to handle kernel NULL pointer
>>>  dereference at 00000000000000a8
>>>  Feb 23 15:04:07 haze kernel: IP: down_write+0x12/0x30
>>>
>>>  and some more. Full pastebin is here: https://pastebin.com/8u70XLWJ
>>>
>>>  This happens when I try to start my domain (called "Win10Full"). When it
>>>  occurs, virsh locks up -- if I'm in virsh and do "list" it sits
>>>  indefinitely. If I ctrl-C at this point, "End of file while reading data:
>>>  Input/output error" gets written to the log, and my host cannot be rebooted
>>>  without a physical power cycle.
>>>
>>>  There is nothing that gets written to /var/log/libvirt/qemu/Win10Full.log.
>>>
>>>  I'm not sure how to proceed; I figured this mailing list would be the first
>>>  place to start. Any suggestions?
>>>
>>>  Thanks in advance,
>>>
>>>  Will
>>>
>>> ------------------------------
>>>
>>>  vfio-users mailing list
>>>  vfio-users at redhat.com
>>>  https://www.redhat.com/mailman/listinfo/vfio-users
>>
>>
>>
>> Hi,
>>
>> This is a bug in 4.15. You can either revert to 4.14, or revert this
>> patch and recompile the kernel:
>>
>> https://patchwork.kernel.org/patch/10103043/raw/
>>
>> Sarnex
>>
>> ------------------------------
>>
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>>
>>
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