Release 9.1.1rc1 (2026-05-29)

Bazel 9.1.1 is a patch LTS release. With two exceptions (see below: CcInfo and --downloader_config), it is backward compatible with Bazel 9.0 and contains selected changes by the Bazel community and Google engineers.

IMPORTANT

Compatibility Note: CcInfo removal and rules_go

If you encounter the error "The CcInfo symbol has been removed", this is due to an intentional change in Bazel 9 regarding C++ Starlarkification. While this change was present in 9.0.0, a bug fixed in 9.0.1 (#28360) now correctly surfaces this error instead of failing silently or with a confusing message. To fix this, please upgrade rules_go, rules_nodejs or any broken rulesets. For example,

# Add repo_name = None if you don't directly depend on them.
bazel_dep(name = "rules_go", version = "0.59.0") 
bazel_dep(name = "rules_nodejs", version = "6.7.3")

External Deps

• --downloader_config was accidentally made a repeatable flag in 9.1.0, which was a backwards-incompatible change. This has been reverted in 9.1.1. (#29616)
• Fixed a crash with file:// URIs. (#29579)
• Fixed a crash with opaque URIs. (#29658)

Remote Execution

• Fixed an issue that caused Bazel to fail on a lost input even with build or action rewinding enabled. (#29677)
• Fix crash on --remote_default_exec_properties with the same key. (#29596)
• Verify the whole blob when downloading chunks (#29593)
• Support bounded parallel chunk transfers (#29614)
• Fix JVM crash from VerifyException in GrpcCacheClient.onNext() (#29583)
• Invalidate unresolved symlink info after deletion in the RAFS (#29671)

Acknowledgments

This release contains contributions from many people at Google, as well as Armando Montanez, ashutosh0x, Boleyn Su, Fabian Meumertzheim, H5-O5, Joseph Gette, Keith Smiley, Paul Tarjan, Ted Kaplan, Tyler French, and Will Stranton.

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