Intel IA-32 - Manual (Page 226)

5-50 Vol. 3A
INTERRUPT AND EXCEPTION HANDLING
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If the segment descriptor from a 64-bit call gate is in non-canonical space.
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If the DPL from a 64-bit call-gate is less than the CPL or than the RPL of the 64-bit call-
gate.
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If the upper type field of a 64-bit call gate is not 0x0.
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If an attempt is made to load a null selector in the SS register in compatibility mode.
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If an attempt is made to load null selector in the SS register in CPL3 and 64-bit mode.
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If an attempt is made to load a null selector in the SS register in non-CPL3 and 64-bit mode
where RPL is not equal to CPL.
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If an attempt is made to clear CR0.PG while IA-32e mode is enabled.
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If an attempt is made to set a reserved bit in CR3, CR4 or CR8.