ARM64: kernel panics in DABT in sys_msync path

[Yury Norov]

On Mon, Sep 25, 2017 at 05:02:40PM +0300, Yury Norov wrote:
>  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.

https://drive.google.com/file/d/0B07VUB3kjLD8Mm5XN21qTTBfbnc/view

> Yury