try fix crash multithreading

5 jobs for master
latest
Status Job ID Name Coverage
  Test Source
failed #4587
test-source-lts

failed #4588
test-source-rolling

 
  Build
skipped #4591
build-rolling-amd64
skipped #4589
lintian-lts
skipped #4590
lintian-rolling
 
Name Stage Failure
failed
test-source-rolling Test Source There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log
failed
test-source-lts Test Source There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log