Fixed issues in XenServer 7.1 CU2

Rollup Hotfixes in CU2

XenServer 7.1 CU2 includes the following XenServer 7.1 CU1 hotfixes:

Additional issues fixed in CU2

The following issues are resolved in XenServer 7.1 CU2:


  • Updated for Brazil’s change in Daylight Saving Date/Time (DST) to 4 Nov 2018. (CP-29838)


  • HA-enabled VMs can take longer to restart after a failover. (CP-28117)

  • The workarounds for Meltdown (CVE-2017-5754) patched in XS70E055, XS70E057, XS71ECU1009, XS71ECU1016, and XS71ECU1017 had reduced performance. Customers who had installed one or more of these hotfixes applied might have experienced degraded IOPS for both PV and HVM VMs. This fix includes a Xen PCID patch that recovers most of the regressed IOPS to the level before the workarounds were applied. The improvement is mostly visible in Xeon v3, Xeon v4, and later Intel CPUs. (CP-29203)


  • If your XenServer 7.0 (or earlier) host has a fully qualified domain name specified as its host name, the domain part of the name can be lost when upgrading to XenServer 7.1 CU1. This issue is resovled for upgrades from XenServer 7.0 (or earlier) to XenServer 7.1 CU2. (CA-296524)


  • In XenServer deployments with multiple VLANs containing different MTU values, restarting a VM can reset all the MTU values to the lowest value present on the network bridge. (CA-196520)

Guest Agent

  • Users fail to install XenServer Tools on VMs using SUSE Linux Enterprise Server 12 SP1 template due to a lack of support for a system call (modify_ldt) in SUSE Linux Enterprise Server 12 SP1. This fix solves the issue by rebuilding XenServer Tools with new version of GO, which removes the dependency for the unsupported option. (CA-297044)


  • Automated guest agent update stops working after a host reboot, due to its dependency on entries in xenstore that were not properly recreated after the reboot. (CA-302194)

  • In rare cases, after a sequence of pool joins, multiple Tools SRs might exist in a pool and prevent a host from being ejected from the pool. Pool join now ensures that only one Tools SR exists in a pool. (CA-300103) (CA-267661)

  • Improved support for importing HyperV generated VHD images into XenServer. (CA-296067)

  • On hosts with a legacy partition scheme, log rotation is not working as expected after an update of xapi-core which is part of the toolstack. (CA-293858)

  • Importing a VHD type of VDI file larger than 1 TiB was unsupported and led to an VDI_IO_ERROR. (CA-292288)

  • In rare cases, when a XenServer host in a pool is restarted, it might not be able to rejoin the pool. (CA-287865)

Windows PV/Guest Tools

  • A Windows 10 VM with the I/O drivers installed can crash with bugcheck code 139. This is caused by a Windows issue which causes an inconsistent state during nonpaged memory allocation. (CP-29203)

  • Windows VMs with the XenVBD driver installed can experience a high number of system interrupts when performing storage operations, especially if you are using fast storage and transferring large amounts of data. (CA-297860)


  • The clock on dom0 drifts on Dell R740 hardware. (CA-285265)

  • In some cases, PXE boot for VMs fail when using a proxy DHCP agent. This happens because of multiple issues in the iPXE version used by XenServer which prevented the VM from booting. (CA-247412) (CA-247413)

XenCenter and xsconsole

  • Batch application of XenServer updates with mixed restart requirements may result in both host reboot and XAPI restart. (CA-297215)

  • Emergency network reset fails with “Login Failed” reported when performed from xsconsole. (CA-248121) (CA-297085)

Fixed issues in XenServer 7.1 CU2