TFTP tests fail on OpenBSD (ci/GHA)

[vszakats]

I did this

While adding an OpenBSD job (with tests) to GHA, some tests failed to run:

• 271 283 284 285 286 332 1007 1009 1093 1094 1099 1242 1243 2002 2003 https://github.com/curl/curl/actions/runs/9042288591/job/24848627402#step:3:9183
• 271 283 284 285 286 332 1007 1049 1093 1094 1099 1242 1243 2002 2003 https://github.com/curl/curl/actions/runs/9042288591/job/24855020568#step:3:9209
• 271 283 284 285 286 332 1007 1093 1094 1099 1242 1243 2002 2003 https://github.com/curl/curl/actions/runs/9066940188/job/24910960122#step:3:9089
• 271 283 284 285 286 332 1007 1009 1049 1093 1094 1099 1242 1243 2002 2003 https://github.com/curl/curl/actions/runs/9069136530/job/24918015357#step:3:10660

The common pattern is that they are TFTP related. Failures are consistent,
but not completely: 1009 and 1049 are on and off.

It seems actual output contains the expected content twice:
#13583 (comment)

I expected the following

Expected these tests to pass. (They do on NetBSD and OmniOS added at the same time.)

curl/libcurl version

master

operating system

OpenBSD 7.5

[bagder]

It probably requires that someone debugs this on an OpenBSD box...

[vszakats]

It looks as if TFTP requests were executed twice:

   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                  Dload  Upload   Total   Spent    Left  Speed
 
   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
 100    41    0    41    0     0  50679      0 --:--:-- --:--:-- --:--:-- 50679
 
 100    41    0    41    0     0  45253      0 --:--:-- --:--:-- --:--:-- 45253

Is there any place to look for clues?

[bagder]

Is tftp_do actually called twice?

[vszakats]

tftp_do() is only called once:

=== Start of file stderr271
   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                  Dload  Upload   Total   Spent    Left  Speed
 
   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0DEBUG: tftp_do() begin
 DEBUG: tftp_do() end result:|0| done:|0|
 
 100    36    0    36    0     0  28548      0 --:--:-- --:--:-- --:--:-- 28548
 
 100    36    0    36    0     0  26607      0 --:--:-- --:--:-- --:--:-- 26607
=== End of file stderr271

Ref: https://github.com/curl/curl/actions/runs/9076301772/job/24938697525#step:3:3515
Using this patch for tracing: 6db4aee