The current read/write lock implementation is read-biased, which allows
a consistent stream of readers to starve writers indefinitely. There
are certain rwlocks where guests are capable of applying arbitrary read
A malicious guest administrator can deny service to other tasks. If
the NMI watchdog is active, a timeout might be triggered, resulting in
a host crash.
Red Hat would like to thank the Xen project for reporting this issue.
This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5.