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FTP Server tests leave behind zombie children #12018

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Herdinger opened this issue Oct 3, 2023 · 0 comments
Closed

FTP Server tests leave behind zombie children #12018

Herdinger opened this issue Oct 3, 2023 · 0 comments
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@Herdinger
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I did this

I've run the ftp server torture tests in parallel mode with -j80.
I've noticed fork starting to fail.
After investigating I found that tests/ftpserver.pl uses the "sh" style open and not the "list" style.
It correctly cleans up the server process, but leaves the "sh" behind as a zombie.

I've fixed this locally by switching to the "list" style of open.
I can submit a pull request for that fix if wanted, but since it is rather small it might make more sense for the maintainers to do it themselves.

I expected the following

Fork not failing, no lingering processes, torture tests working in parallel test mode.

curl/libcurl version

WARNING: this libcurl is Debug-enabled, do not use in production

curl 8.3.0-DEV (aarch64-unknown-linux-gnu) libcurl/8.3.0-DEV OpenSSL/3.0.9 zlib/1.2.13 c-ares/1.18.1
Release-Date: [unreleased]
Protocols: dict file ftp ftps gopher gophers http https imap imaps mqtt pop3 pop3s rtsp smb smbs smtp smtps telnet tftp ws wss
Features: alt-svc AsynchDNS Debug HSTS HTTPS-proxy IPv6 Largefile libz NTLM NTLM_WB SSL threadsafe TLS-SRP TrackMemory UnixSockets

operating system

Linux debian 6.1.0-12-arm64 #1 SMP Debian 6.1.52-1 (2023-09-07) aarch64 GNU/Linux
@bagder bagder added the tests label Oct 3, 2023
Herdinger added a commit to Herdinger/curl that referenced this issue Oct 3, 2023
@Herdinger
tests: Fix zombie processes left behind by FTP tests.
fa173b1 
ftpserver.pl correctly cleans up spawned server processes,
but forgets to wait for the shell used to spawn them.
This is barely noticeable during a normal testrun,
but causes process exhaustion and test failure
during a complete torture run of the FTP tests.

Fixes curl#12018
@Herdinger Herdinger mentioned this issue Oct 3, 2023
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tests: Fix zombie processes left behind by FTP tests. Herdinger/curl
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@bagder @Herdinger