NTSTATUS 0x40000001 (STATUS_THREAD_WAS

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: Termination encountered a suspended thread, resumed it, and continued the termination path.

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STATUS_THREAD_WAS_SUSPENDED

A suspended thread had to be resumed for termination

A suspended thread is not scheduled while its suspend count remains nonzero. This informational status says thread termination collided with that suspended state; Windows resumed the thread as part of allowing termination to proceed. It is therefore evidence about lifecycle ordering, not a request for the caller to resume the thread again.

Record who suspended the thread and who initiated termination. Microsoft documents SuspendThread primarily as a debugger-oriented mechanism and warns that arbitrary suspension can leave synchronization objects held. If termination regularly finds suspended workers, inspect shutdown sequencing and debugger or watchdog logic.

What to inspect

Trace suspend/resume calls and the thread suspend count.
Correlate the termination request with debugger, watchdog, or process-shutdown activity.
Do not issue an extra ResumeThread solely because this informational status was observed.

References

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