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

[Brett Peckinpaugh]

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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