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The test fails because the stderr output reports: dtrace: Failed to enable uprobe:ca21_17c733:main:1062 Disassembly of section .text: 0000000000001050
: 1050: 66 0f ef d2 pxor %xmm2,%xmm2 1054: 48 83 ec 18 sub $0x18,%rsp 1058: f2 0f 2a d7 cvtsi2sd %edi,%xmm2 105c: f2 0f 11 54 24 08 movsd %xmm2,0x8(%rsp) ==> 1062: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) 1069: 00 00 00 00 106d: 0f 1f 00 nopl (%rax) I am not sure how to best handle this discrepancy.