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The page table corrupted error

Link to this post 16 Aug 13

Recently I have met an error

[ 72.643005] ash: Corrupted page table at address ffff88007f294000
[ 72.643005] at ffff88007f294000
[ 72.643005] IP: [<ffffffff8113e775>] copy_page_c+0x5/0x10
[ 72.643005] PGD 160a063 PUD 1fffb067 PMD ff7f9
[ 72.643005] Oops: 0009 [#1] PREEMPT SMP

with the Oops: 0009 [#1]. With the information from LXR / The Linux Cross Reference

Page fault error code bits:
bit 0 == 0: no page found 1: protection fault
bit 1 == 0: read access 1: write access
bit 2 == 0: kernel-mode access 1: user-mode access
bit 3 == 1: use of reserved bit detected
bit 4 == 1: fault was an instruction fetch

The error is due to protection fault and use of reserved bit detected. Are there anybody knowing about this error. What does it exactly mean?

Thank you

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