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misc/cgo/testcshared: sometimes stalls on windows-amd64-longtest builder in non-sharded longtest mode #39665

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dmitshur opened this issue Jun 17, 2020 · 1 comment
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@dmitshur
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@dmitshur dmitshur commented Jun 17, 2020

I've observed the following failure scenario while testing all.bash in non-sharded longtest mode via x/build/cmd/release. The build stalled on the ##### ../misc/cgo/testcshared test and did not make progress for several hours:

[...]
PASS
scatter = 0000000000EDD070
sqrt is: 0
hello from C
ok  	misc/cgo/test	7.344s

##### ../misc/cgo/testgodefs
PASS

##### ../misc/cgo/testso
ok  	misc/cgo/testso	1.977s

##### ../misc/cgo/testsovar
ok  	misc/cgo/testsovar	2.309s

##### ../misc/cgo/testcarchive
PASS

##### ../misc/cgo/testcshared

I've observed this just twice, on the latest commit of release-branch.go1.14, and on a recent commit of master (to be 1.15), using the windows-amd64-longtest builder:

$ release -target=windows-amd64-longtest -watch -version go1.14beta2 -rev=e98cafae04b78f1e994d52ea66d228451c8e6f81
$ release -target=windows-amd64-longtest -watch -version go1.15beta2 -rev=dea6d928f6c293631ce93bd3a3bb8b4020188954

It didn't happen a second time, after I re-tried. I don't yet know how common of an occurrence this is.

This is the tracking issue to collect information and investigate.

/cc @cagedmantis @toothrot @andybons @ianlancetaylor @bcmills

@dmitshur dmitshur added this to the Backlog milestone Jun 17, 2020
@dmitshur dmitshur changed the title misc/cgo/testcshared: sometimes stalls on windows-amd64-longtest builder in release testing mode misc/cgo/testcshared: sometimes stalls on windows-amd64-longtest builder in non-sharded longtest mode Jun 17, 2020
@dmitshur
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@dmitshur dmitshur commented Jun 24, 2020

There may have been an occurrence of this exact problem or a similar problem in the SlowBot run of CL 239738 on the windows-amd64-2016 builder just now:

[...]
scatter = 0000000000569860
sqrt is: 0
hello from C
ok  	misc/cgo/test	16.696s

##### ../misc/cgo/testgodefs
PASS

##### ../misc/cgo/testso
ok  	misc/cgo/testso	1.981s

##### ../misc/cgo/testsovar
ok  	misc/cgo/testsovar	2.256s

##### ../misc/cgo/testcarchive
PASS


Error: runTests: dist test failed: all buildlets had network errors or timeouts, yet tests remain
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