Odd looking #PF fault code

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I get this when trying to get EAUG-EACCEPTCOPY to run on Enarx and I get:

Unexpected PF: address: 0x007f7fff910000, error code 0x15

I'm using patches from:

https://github.com/rchatre/linux/tree/sgx/sgx2_submitted_v2_plus_rwx

Fault code is in other words PROT|WRITE|USER|RSVD.

According to arch/x86/kernel/fault.c:

	/*
	 * Reserved bits are never expected to be set on
	 * entries in the user portion of the page tables.
	 */
	if (unlikely(error_code & X86_PF_RSVD))
		pgtable_bad(regs, error_code, address);

Any clue how this fault code could emit?

[*] https://github.com/enarx/enarx/pull/1608

BR, Jarkko



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