<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/60772>60772</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            scudo-standalone: GetRssFromBuffer test case fails intermittently on PPC
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          amy-kwan
      </td>
    </tr>
</table>

<pre>
    The `GetRSSFromBuffer` test case introduced in https://reviews.llvm.org/D139430 fails intermittently on PPC. 
```
/home/amyk/community/llvm-project/compiler-rt/lib/scudo/standalone/tests/common_test.cpp:93: Failure
Expected: (std::abs(Rss - AllocSize - Prev)) <= (Error), actual: 3708544 vs 3000000
```

As noted in my comment in the patch, 
- This test can can fail on any iteration of the for loop (sometimes it fails on the first iteration, other times the ninth, etc.)
- The amount that it fails with is always 3708544. It is always 708544 more than the expected error.
- The RSS prior to the `EXPECT_LE()` check always appears to be less than `Prev` + `AllocSize`

I am opening this external issue to track the failure that I am seeing (on `main` and for LLVM 16.0.0) and I'll use this issue if we need to backport any additional patches to resolve this issue. 

</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJx8VFtvszgQ_TXmZRTkGALhgYf0wqpSV6raarVvnwwMxRtjI3tIvuyvX9mkbfaijXIb45kzc459pPfqwyDWbHfHdg-JXGi0rpbTZXM8S5O0tr_U7yMCK_gvSK9vb42z090yDOhYwYHQE3TSIyhDzvZLhz0oAyPR7Fl2YKJhonF4Unj2qdanKbXug4nmYZtVecZhkEr7kIxuUkRoSF_AGnh5uU-B8QfGD6zg1_caima0EzLRyOlyZKLp7DQtRtGFiSYgbGZn_8CO1kez0ug2LkRatUw0vlt6G35Jml5qa0KpMIe_1rLmRwjTbp5Zdqgylh2gkUovDtcOHn_O2BH24QETe0_hH8sOsvVM7F-9hw0ctLbdm_oTYQMvDk9MVExUwLJ7lj2ErEfnrIur9yA7WqQO5bKS73d5DicPGY-v_-Ygfh88GEsr4dMFQu9oKEQ0IsySujFUXzdv4H1U_lMwEz-B_EC2NBdQhE6SsgbsEPMH60BbO8cR7YSkJvSg6CqZXVEG5Tx9Jwc8SyM6WLeHLUYZio0gdWmY-KsfBDnZxRDQKOm79FnRCMqD1Gd58Z-cpPBEN6tXoibrMKSv3eBVGcDAbnqL9Pr2BrNT1gHZuJcV_PH3l8f79x_Pj0zsQ2MFh27E7viJIecZpfMho0XQ6P0KxQoeNS04MHEXwi-5_yHRE8gJ7IxGmQ-gIAD-JHRGalDeLxibcbI7rmSup2ylI6Z6xJDJxN5G2EkqE2Cl6aNAz8-__QrbIuUpD8crLD8xUWoNi8cVcMVRA5wRDGIfp5HdcbaOovKy71XQTur1zGAc2KG3-nRb4_M-Jn2d9VVWyQTrbVEWeVlsK56MNQ6ZyPtyn-eib7tqqMpt1WW7aoflHndZlahacJFxsd1td3m146koy33ecd63VTtk25LlHCep9JdTJBG5LnhZikTLFrWPViWEwfPaFhMiOJer491vlw_Pcq6Vp2-_SUiRxjre_M3Nvc8OEEzN-29Tu3G0_7GmZHG6_rvHfSgalzbt7HS1oX-7UWw3uEwc568AAAD__xf7wqo">