Fixed
Created: Nov 16, 2017
Updated: Nov 21, 2019
Resolved Date: Dec 21, 2017
Found In Version: 8.0.0.20
Fix Version: 8.0.0.25
Severity: Severe
Applicable for: Wind River Linux 8
Component/s: Kernel , Userspace
Customer use OVP8 RCPL 20. The VM will crash when using the virtfs and delete folder in the shared folder in VM.
In host dmesg, segmentation fault is seen:
[ 1323.318192] kvm[2322]: segfault at fedffff8 ip 00007fdafae89b54 sp 00007fda66beae68 error 4 in libc-2.22.so[7fdafae0e000+19a000]
It's reproducible on OVP8 host, and wrlinux6 kvm guest in WR's lab.
See detailed steps in steps to reproduce.
1. Host project configuration:
/opt/WRLX8/wrlinux-8/wrlinux/configure --enable-board=intel-x86-64 --enable-kernel=ovp --enable-rootfs=ovp_kvm+installer-support --enable-bootimage=hdd,tar.bz2 --with-bootimage-space=1024 --enable-checkout-all-layers=yes --enable-reconfig --enable-rm-oldimgs=yes --enable-addons=wr-ovp --enable-internet-download=yes --enable-parallel-pkgbuilds=8 --enable-jobs=8 --with-layer=wr-dpdk,wr-qat --with-template=feature/initramfs --with-rcpl-version=0020
Guest project configration:
/opt/WRLX6/wrlinux-6/wrlinux/configure --enable-board=x86-64-kvm-guest --enable-rootfs=ovp-guest+initramfs+installer-support --enable-addons=wr-ovp,wr-qat --with-template=feature/target-toolchain,feature/gdb --enable-jobs=8 --enable-parallel-pkgbuilds=8 --enable-rm-oldimgs=yes --enable-internet-download=yes --enable-reconfig --with-rcpl-version=0023
2. Boot OVP host with the following configuration change:
/etc/fstab:
----
huge /dev/huge1G hugetlbfs pagesize=1G 0 0
huge /dev/huge2M hugetlbfs pagesize=2M 0 0
----
/etc/libvirt/qemu.conf:
----
user = "root"
group = "root"
hugetlbfs_mount = ["/dev/huge2M","/dev/huge1G"]
----
3. Bring up VM with libvirt, using the following xml segment:
----------
<filesystem type='mount' accessmode='mapped'>
<source dir='/var/third-party/testme'/>
<target dir='mshare'/>
<alias name='fs0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</filesystem>
----------
4. Inside the VM mount the virtfs
mount -t 9p -o trans=virtio mshare /mnt
#cd /mnt
# mkdir test
#cd test
#touch x
# touch y
5. Open another ssh session to VM
delete the directory /mnt/test
6. In side the VM, stay in the /mnt/test before delete the folder.
After the deletion complete, try do the ls in the console, then the VM will crash.
