Red Hat ENTERPRISE LINUX 5.5 - TECHNICAL NOTES Manual page 114

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Chapter 1. Package Updates
• Fix AMD erratum - server C1E
• EXPERIMENTAL EX/MC: AMD IOMMU Linux driver with latest BIOS has IO PAGE FAULTS
531469/539689
• [Intel 5.5 BUG] NMI and Watchdog are not disabled on CPU when CPU is taken offline.
740
BZ#532514
• Boxboro-EX: multiple equal directory entries in /proc/acpi/processor
1.88.7.1.2.2. x86-specific Updates
• Fix AMD Magny-Cours boot inside Xen on pre-5.5 hypervisor.
A problem was found where Beta 1 of Red Hat Enterprise Linux 5.5 would fail to boot as a Xen
guest on AMD Magny-Cours systems using a hypervisor other than the one included in Red Hat
Enterprise Linux 5.5.
This update provides a fix for this issue.
• Support always running local APIC.
• kvm: Mark kvmclock_init as cpuinit.
• Fix stale data in shared_cpu_map cpumasks.
This update was necessary to avoid possible kernel panic when performing frequent CPU online/
offline operations.
1.88.7.1.2.3. x86_64-specific Updates
• k8: Do not mark early_is_k8_nb as __init.
This update addresses a problem with CPU hotplugging identified on AMD Magny-Cours machines.
• Avoid deadlocks during MCE broadcasts.
• Wire up compat sched_rr_get_interval.
A problem was found where if a program that calls sched_rr_get_interval() is compiled
on x86 and is executed on x86_64, it will destroy the user stack. This problem is solved by calling
sys32_sched_rr_get_interval() instead of sys_sched_rr_get_interval() when
sched_rr_get_interval() is called.
This update includes a backport of an upstream patch to correct this problem.
• Disable vsyscall in kvm guests.
A problem was found on Red Hat Enterprise Linux 5.4 guests with PV clock enabled, where there
is a large difference between the time returned by clock_gettime(CLOCK_REALTIME) and the
time returned by gettimeofday(), even if a program executes one call right after the other.
This update addresses the problem, which was traced to the use of vsyscall in kvm guests.
• Resolve issue with SCTP messages arriving out of order.
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BZ#519422
743
BZ#496306
744
BZ#523450
BZ#541953
BZ#567275
BZ#562866
748
BZ#557092
749
BZ#542612
BZ#537395
742
BZ#560013
745
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BZ#517504
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