[llvm-bugs] [Bug 45072] New: NamedRegionTimer is not thread safe

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45072

            Bug ID: 45072
           Summary: NamedRegionTimer is not thread safe
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Support Libraries
          Assignee: unassignedbugs at nondot.org
          Reporter: tomasz.miasko at gmail.com
                CC: llvm-bugs at lists.llvm.org

The NamedRegionTimer obtains a timer instance from NamedRegionTimers global,
which keeps a single timer per timer name and timer group name. Those names are
generally constants and a single timer might end up being used from multiple
threads:

Assertion `!Running && "Cannot start a running timer"' failed.

This affects rustc -Z time-llvm-passes when compiling with multiple codegen
units.

Downstream bug reports:
* https://github.com/rust-lang/rust/issues/53136
* https://github.com/rust-lang/rust/issues/48329

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