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Old 23rd August 2012
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jggimi jggimi is offline
More noise than signal
 
Join Date: May 2008
Location: USA
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A UVM is a region of virtual memory. See uvm(9), which includes a description of the fields in the uvm_fault message.

The "page fault trap" is typically caused by a request for a page of virtual memory (page fault) which is invalid. The kernel cannot continue operating, and panics with the message you see on screen.

The "ddb>" prompt comes from the ddb(4) kernel debugger, allowing you to obtain information such as a "trace" -- showing recent process flow of the kernel, and "ps", showing all processes and their states at the time of the panic.

Please see FAQ 2.4 on bug reporting -- a page fault trap is actually used in the example problem within.

Please see the crash(8) man page for information on how to understand what you can do to obtain more information for problem reporting, or even doing your own diagnostics.
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