What does the linux page address '0xdead0000~~' mean?

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I used kgdb to debug linux kernel and print *page. The result shows some addresses started with '0xdead'

Like, {lru = {next = 0xdead000000000100, prev = 0xdead000000000122},

0xdead pages

What those pages mean? a NULL page? or something meaningful?

Thank you.

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These pointers are poison constants. They are set to next and previous when a list entry is removed from the list. See list_del().