Original source ./drivers/acpi/acpica/dswexec.c in acpi_ds_exec_end_op
if (ACPI_SUCCESS(status)) {
/*
* Dispatch the request to the appropriate interpreter
handler
* routine. There is one routine per opcode "type"
based upon the
* number of opcode arguments and return type.
*/
status =
acpi_gbl_op_type_dispatch[op_type] (walk_state);
} else {
.. disassembled:
if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
683: 48 8b 83 10 04 00 00 mov 0x410(%rbx),%rax
68a: f6 40 11 40 testb $0x40,0x11(%rax)
68e: 74 21 je 6b1 <acpi_ds_exec_end_op+0x177>
* Dispatch the request to the appropriate interpreter
handler
* routine. There is one routine per opcode "type"
based upon the
* number of opcode arguments and return type.
*/
status =
acpi_gbl_op_type_dispatch[op_type] (walk_state);
690: 44 89 f0 mov %r14d,%eax
693: 41 80 fe 0b cmp $0xb,%r14b
697: 77 28 ja 6c1 <acpi_ds_exec_end_op+0x187>
699: 48 8b 04 c5 00 00 00 mov 0x0(,%rax,8),%rax
6a0: 00
6a1: 48 89 df mov %rbx,%rdi
6a4: e8 00 00 00 00 call 6a9 <acpi_ds_exec_end_op+0x16f>
6a9: 41 89 c4 mov %eax,%r12d
6ac: e9 8f 00 00 00 jmp 740 <acpi_ds_exec_end_op+0x206>
[walk_state->
6b1: 0f b6 43 0d movzbl 0xd(%rbx),%eax
num_operands - 1]),
6b5: 8d 50 ff lea -0x1(%rax),%edx
[walk_state->
6b8: 48 63 d2 movslq %edx,%rdx
6bb: 48 83 fa 09 cmp $0x9,%rdx
6bf: 76 02 jbe 6c3 <acpi_ds_exec_end_op+0x189>
6c1: 0f 0b ud2
^^ crash on 0f 0b ud2 instruction
From https://mudongliang.github.io/x86/html/file_module_x86_id_318.html
ud2 does:
"Generates an invalid opcode. This instruction is provided for software
testing to explicitly generate an invalid opcode. The opcode for this
instruction is reserved for this purpose.
Other than raising the invalid opcode exception, this instruction is the
same as the NOP instruction."
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https://bugs.launchpad.net/bugs/1942215
Title:
OOPs on boot: invalid opcode: 0000 [#1] SMP NOPTI
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