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: [email protected]
Reporter: [email protected]
CC: [email protected]
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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