ARM64: kernel panics in DABT in sys_msync path

[Yury Norov]

 Hi Will,
 
> > The bug is reproducible for ilp32 and lp64 binaries. For kernel 4.12
> > and for all kernels if '-smp 1' is passed to qemu, everything works
> > fine. If no ideas, I think I'm able bisect it.
> 
> I tried to reproduce this on hardware, but failed to do so. Our nightly
> tests are also coming back fine for rwtest03. I just built Qemu v2.10.0
> and that also passes the test with -smp 4 for me, so I'm a bit stuck.

I also see the test passed sometimes. I run it in endless cycle and
leave for a while. 5-10 iterations are usually enough.

> Could you share:
> 
>   * Your kernel .config
>   * Your QEMU command line
>   * Details of your userspace

Qemu configure command:
./configure --target-list=aarch64-softmmu --enable-fdt --enable-vhost-net --enable-kvm

And run command:
/home/yury/work/qemu-2.10.0/aarch64-softmmu/qemu-system-aarch64 \
	-machine virtualization=true -machine gic-version=3 \
	-machine virt -cpu cortex-a57 -nographic -smp 4  -m 1024 \
	-global virtio-blk-device.scsi=off -device virtio-scsi-device,id=scsi \
	-drive file=img/ubuntu-core-14.04.1-core-arm64.img,id=coreimg,cache=unsafe,if=none -device scsi-hd,drive=coreimg \
	-kernel /home/yury/work/linux/arch/arm64/boot/Image \
	--append "console=ttyAMA0 root=/dev/sda" \
	-initrd initrd.img-3.13.0-62-generic \
	$NETWORK \
	-redir tcp:2222::22 \
	-s \
	$@

My userspace is Ubuntu 14. I build lp64 tests with default Ubuntu
toolchain, and ilp32 tests with Linaro cross-toolchain. 

The config is attached, and the branch is vanilla 4.13 kernel, or this
one:
https://github.com/norov/linux/tree/ilp32-4.13

Later today I will share the whole qemu environment I use.

Yury
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