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Quoting from `hurd/hurd/signal.h`:

> A *critical section* is a section of code which cannot safely be interrupted
> to run a [[signal handler|signal]]; for example, code that holds any lock
> cannot be interrupted lest the signal handler try to take the same lock and
> deadlock result.

[[!tag open_issue_glibc]]Checking the code for any violations would be a useful
task of [[open_issues/code_analysis]]/[[open_issues/formal_verification]].