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tests/net/gcoap_fileserver: Fix failing nightlies#19856

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MrKevinWeiss:test/gcoap
Aug 3, 2023
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tests/net/gcoap_fileserver: Fix failing nightlies#19856
bors[bot] merged 1 commit intoRIOT-OS:masterfrom
MrKevinWeiss:test/gcoap

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@MrKevinWeiss MrKevinWeiss commented Aug 2, 2023 •
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This test has been failing inconsistently in the nightlies and sometimes on unrelated PRs. I was able to reproduce it with murdock and as soon as I added some print statements to the test it went away. Since the issue is something to do with a failure when comparing 2 files after a node sends a file I am guessing that the comparison comes occasionally too fast and the file is not ready.

Maybe there is some more synchronization needed after a ncput but for now just adding a small sleep should prevent this issue.

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Run murdock multiple times or try to get it failing on a local setup then apply the PR...

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@MrKevinWeiss MrKevinWeiss added CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR CI: full build disable CI build filter labels Aug 2, 2023
@MrKevinWeiss MrKevinWeiss requested a review from kaspar030 as a code owner August 2, 2023 07:02
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MrKevinWeiss commented Aug 2, 2023

bors try

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Try #19856:
0097262
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riot-ci commented Aug 2, 2023 •
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Murdock results

✔️ PASSED

653bd61 tests/net/gcoap_fileserver: fix race condition

Success Failures Total Runtime
17 0 17 01m:41s

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try

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@github-actions github-actions bot added the Area: tests Area: tests and testing framework label Aug 2, 2023
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MrKevinWeiss commented Aug 2, 2023

bors try

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Try #19856:
e8b11ad
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MrKevinWeiss commented Aug 2, 2023

bors try

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try

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try

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MrKevinWeiss commented Aug 2, 2023

bors try

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Try #19856:
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try

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MrKevinWeiss commented Aug 2, 2023

bors try

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Try #19856:
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MrKevinWeiss commented Aug 2, 2023

bors try

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Try #19856:
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MrKevinWeiss commented Aug 2, 2023

bors try

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Try #19856:
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MrKevinWeiss commented Aug 2, 2023

bors try

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Try #19856:
d10cb6f
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@MrKevinWeiss MrKevinWeiss changed the title REMOVEME: just testing tests/net/gcoap_fileserver: Fix failing nightlies Aug 2, 2023
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MrKevinWeiss commented Aug 2, 2023

Here is it with the fix, I will try a few times... Maybe @benpicco or @maribu can take a quick look.

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MrKevinWeiss commented Aug 2, 2023

bors try

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Try #19856:
bd53f29
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I don't quite understand why it would work (Linux should be aware of it's page cache even when things are not synced to disc yet) but if it fixes things ¯\(ツ)/¯

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MrKevinWeiss commented Aug 2, 2023

I am not sure if it fixes things I just cannot fail them anymore... I also see that there is a sleep 10 so an extra 0.5 seconds of sleep is probably not too bad (and it is commented)

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MrKevinWeiss commented Aug 2, 2023

bors merge

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🕐 Waiting for PR status (GitHub check) to be set, probably by CI. Bors will automatically try to run when all required PR statuses are set.

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@benpicco benpicco added CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR and removed CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR CI: full build disable CI build filter labels Aug 2, 2023
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benpicco commented Aug 2, 2023

bors merge

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MrKevinWeiss commented Aug 3, 2023

bors merge

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Build succeeded!

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@bors bors bot merged commit bb9011c into RIOT-OS:master Aug 3, 2023
@MrKevinWeiss MrKevinWeiss deleted the test/gcoap branch August 3, 2023 06:02
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benpicco commented Aug 7, 2023

Looks like this didn't help much 😕

https://ci.riot-os.org/details/3b451741657544d39b8b6e25401fc7d5

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MrKevinWeiss commented Aug 7, 2023

shoot, flakey failures really makes life hard...

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MrKevinWeiss commented Aug 7, 2023 •
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Well at least we know it isn't a race condition. What about adding a print on error and retry send if they don't match, just to get some more info on the issue (if it is a toggled bit or missing byte vs missing file might tell us a bit more)?

@MrKevinWeiss MrKevinWeiss added this to the Release 2023.10 milestone Nov 17, 2023
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