[llvm-bugs] [Bug 38588] New: XRay memory allocation may cause segfaults

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https://bugs.llvm.org/show_bug.cgi?id=38588

            Bug ID: 38588
           Summary: XRay memory allocation may cause segfaults
           Product: XRay
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Runtime
          Assignee: dberris at google.com
          Reporter: dberris at google.com
                CC: llvm-bugs at lists.llvm.org

In the mmap-backed memory that XRay reserves in both fdr and profiling modes,
we used a MAP_NORESERVE flag which forced pages to be always memory-backed and
never swapped out. Originally we thought this would have been fine, but we're
seeing the opposite feedback from users.

This bug tracks the change to remove the MAP_NORESERVE flag from the XRay
allocation calls.

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