Log non-zero exit status in SSHTunnel.close/aclose #3296
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jvstme
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Nov 19, 2025
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When error logging was added to SSHTunnel.close()[1], it was discovered that SSHAttach.detach() is called multiple times on detach. Although this is harmless as long as this method is idempotent (and it is), this patch ensures that detach() is no-op when called more than one time, removing ERROR level log noise. As a side-effect, detaching SSHAttach that reuses SSHTunnel no longer kills "master" SSHAttach, meaning that one can `dstack attach` multiple times and detach independently (detaching from the "master" attach still kicks out all other attaches). [1]: #3296
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When error logging was added to SSHTunnel.close()[1], it was discovered that SSHAttach.detach() is called multiple times on detach. Although this is harmless as long as this method is idempotent (and it is), this patch ensures that detach() is no-op when called more than one time, removing ERROR level log noise. As a side-effect, detaching SSHAttach that reuses SSHTunnel no longer kills "master" SSHAttach, meaning that one can `dstack attach` multiple times and detach independently (detaching from the "master" attach still kicks out all other attaches). [1]: #3296
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