Oracle Linux - System Log Message "kernel: x2apic not enabled, IRQ remapping is in xapic mode" Shown (Doc ID 1917936.1)

Last updated on SEPTEMBER 10, 2014

Applies to:

Linux OS - Version Oracle Linux 6.2 and later
Information in this document applies to any platform.

Symptoms

Jun 29 12:59:59 myhost kernel: ------------[ cut here ]------------
Jun 29 12:59:59 myhost kernel: WARNING: at drivers/pci/intr_remapping.c:715 enable_intr_remapping+0x73/0x2af() (Not tainted)
Jun 29 12:59:59 myhost kernel: Hardware name: ProLiant DL380p Gen8
Jun 29 12:59:59 myhost kernel: Your BIOS has requested that x2apic be disabled.
Jun 29 12:59:59 myhost kernel: This will leave your machine vulnerable to irq-injection attacks.
Jun 29 12:59:59 myhost kernel: Use 'intremap=no_x2apic_optout' to override BIOS request.
Jun 29 12:59:59 myhost kernel: Modules linked in:
Jun 29 12:59:59 myhost kernel: Pid: 1, comm: swapper Not tainted 2.6.32-220.el6.x86_64 #1
Jun 29 12:59:59 myhost kernel: Call Trace:
Jun 29 12:59:59 myhost kernel: [<ffffffff81069b77>] ? warn_slowpath_common+0x87/0xc0
Jun 29 12:59:59 myhost kernel: [<ffffffff81069c66>] ? warn_slowpath_fmt+0x46/0x50
Jun 29 12:59:59 myhost kernel: [<ffffffff81c50521>] ? enable_intr_remapping+0x73/0x2af
Jun 29 12:59:59 myhost kernel: [<ffffffff81c30248>] ? enable_IR+0x54/0x6e
Jun 29 12:59:59 myhost kernel: [<ffffffff81c30322>] ? enable_IR_x2apic+0xc0/0x221
Jun 29 12:59:59 myhost kernel: [<ffffffff81c2e189>] ? native_smp_prepare_cpus+0x143/0x389
Jun 29 12:59:59 myhost kernel: [<ffffffff81c1f740>] ? kernel_init+0x112/0x2f9
Jun 29 12:59:59 myhost kernel: [<ffffffff8100c14a>] ? child_rip+0xa/0x20
Jun 29 12:59:59 myhost kernel: [<ffffffff81c1f62e>] ? kernel_init+0x0/0x2f9
Jun 29 12:59:59 myhost kernel: [<ffffffff8100c140>] ? child_rip+0x0/0x20
Jun 29 12:59:59 myhost kernel: ---[ end trace a7919e7f17c0a725 ]---
Jun 29 12:59:59 myhost kernel: Enabled IRQ remapping in xapic mode
Jun 29 12:59:59 myhost kernel: x2apic not enabled, IRQ remapping is in xapic mode
Jun 29 12:59:59 myhost kernel: Setting APIC routing to physical flat
Jun 29 12:59:59 myhost kernel: ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
Jun 29 12:59:59 myhost kernel: CPU0: Intel(R) Xeon(R) CPU E5-2690 0 @ 2.90GHz stepping 07
Jun 29 12:59:59 myhost kernel: Performance Events: PEBS fmt1+, SandyBridge events, Broken BIOS detected, complain to your hardware vendor.
Jun 29 12:59:59 myhost kernel: [Firmware Bug]: the BIOS has corrupted hw-PMU resources (MSR 38d is 330) =================================> Hardware error

Cause

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