spawn hangs and became defunct sometimes

[Vidos]

In my test, sometimes spawn works well:
root@lkp-skl-1sp1 ~# date Thu Feb 28 16:00:57 CST 2019 root@lkp-skl-1sp1 ~# /lkp/benchmarks/unixbench/UnixBench/pgms/spawn 30 COUNT|457035|1|lps root@lkp-skl-1sp1 ~# date Thu Feb 28 16:01:31 CST 2019

But sometimes, hang for a long time, more than 20 minutes:
`root@lkp-skl-1sp1 ~# /lkp/benchmarks/unixbench/UnixBench/pgms/spawn 30
COUNT|446646|1|lps
root@lkp-skl-1sp1 ~# /lkp/benchmarks/unixbench/UnixBench/pgms/spawn 30
COUNT|457072|1|lps
root@lkp-skl-1sp1 ~# /lkp/benchmarks/unixbench/UnixBench/pgms/spawn 30
COUNT|444714|1|lps
root@lkp-skl-1sp1 ~# /lkp/benchmarks/unixbench/UnixBench/pgms/spawn 30
COUNT|446990|1|lps

^C
root@lkp-skl-1sp1 ~# `

Then became a defunct:
root 17877 17817 0 16:05 ? 00:00:00 /lkp/benchmarks/unixbench/UnixBench/pgms/spawn 30 root 22208 17877 0 16:06 ? 00:00:00 [spawn] <defunct> root 30370 16066 0 16:13 pts/0 00:00:00 [spawn] <defunct>

[bssrikanth]

are there any updates on fixing this issue?

[gstrauss]

@bssrikanth do you have a contribution to make such as a proposed patch or more information?

A general guide to asking technical questions well can be found at
http://catb.org/~esr/faqs/smart-questions.html (unaffiliated external link)

[bssrikanth]

@gstrauss I was exploring running unixbench from LKP. Where I saw spawn tests were commented out, when I digged a bit I found this and #62 issue. I have not hit any issues till now with spawn, but from these issues I see its a intermittent issue. Since its a old issue I thought of asking if this by any chance has been fixed in later versions of unixbench.