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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic xml:lang="en-us" id="ts_linux-buggy">
<title>Buggy Linux 2.6 Kernel Versions</title>
<body>
<p>The following bugs in Linux kernels prevent them from executing correctly in <ph conkeyref="vbox-conkeyref-phrases/product-name"/>, causing VM boot crashes:</p>
<ul>
<li>
<p>The Linux kernel version 2.6.18, and some 2.6.17 versions, introduced a race condition that can cause boot failures in <ph conkeyref="vbox-conkeyref-phrases/product-name"/>. Use kernel version 2.6.19 or later.</p>
</li>
<li>
<p>With hardware virtualization and the I/O APIC enabled, kernels before 2.6.24-rc6 may panic on boot with the following message:</p>
<pre xml:space="preserve">Kernel panic - not syncing: IO-APIC + timer doesn't work! Boot with
apic=debug and send a report. Then try booting with the 'noapic' option</pre>
<p>If you see this message, either disable hardware virtualization or the I/O APIC as described in <xref href="settings-system.dita">System Settings</xref>, or upgrade the guest to a newer kernel.</p>
<p>See <xref href="http://www.mail-archive.com/git-commits-head@vger.kernel.org/msg30813.html" format="html" scope="external">this message</xref> for details about the kernel fix.</p>
</li>
</ul>
</body>
</topic>
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