cfsmoke tests are unstable

Current behavior

Test fail regularly with the same error, e.g. https://ci.funtime.lol/teams/wg-arp-networking/pipelines/routing-release/jobs/run-cfsmoke/builds/269:

[FAILED] in [AfterEach] - /var/vcap/packages/smoke_tests/src/smoke_tests/smoke/isolation_segments/isolation_segment.go:75 @ 02/05/26 21:13:03.83  
<< Timeline  

[FAILED] Timed out after 30.000s.  
Expected process to exit.  It did not.  
In [AfterEach] at: /var/vcap/packages/smoke_tests/src/smoke_tests/smoke/isolation_segments/isolation_segment.go:75 @ 02/05/26 21:13:03.83  
------------------------------  
•••  
  
Summarizing 1 Failure:  
  [FAIL] RoutingIsolationSegments [AfterEach] When an app is pushed to a space that has been assigned the shared isolation segment is not reachable from the isolation segment router  
  /var/vcap/packages/smoke_tests/src/smoke_tests/smoke/isolation_segments/isolation_segment.go:75  
  
Ran 4 of 4 Specs in 109.877 seconds  
FAIL! -- 3 Passed | 1 Failed | 0 Pending | 0 Skipped  
  
  
Ginkgo ran 3 suites in 1m49.898900119s  
  
There were failures detected in the following suites:  
  isolation_segments ./smoke/isolation_segments  
  
Test Suite Failed  
  
[WARN  tini (1)] Reaped zombie process with pid=20  
Error: failed to run job-process: exit status 1 (exit status 1)  

Desired behavior

(more) stable test.

Affected Version

all

Start with smoke/isolation_segments/isolation_segment.go, especially the AfterEach failure at line 75, and run the isolation_segments suite at ./smoke/isolation_segments. Compare the recurring timeout in the linked CI build with the suite's behavior; done means the cfsmoke test no longer fails intermittently and remains reliable across runs.