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x/build/maintner: (*netMutSource).syncSeg occasionally fails with "Access is denied." on Windows #36163

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bcmills opened this issue Dec 16, 2019 · 3 comments

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@bcmills bcmills commented Dec 16, 2019

It appears that maintner is trying to install log segments using atomic renames:
https://github.com/golang/build/blob/0d536a3af5fb211db2c73a4499672e9c77ed06cb/maintner/netsource.go#L580-L582

Note that Windows does not actually ensure the success of atomic callso to os.Rename (see also #34681).

For cmd/go we have an internal workaround in cmd/go/internal/robustio, which retries errors suspected to be spurious, although at this point we're mostly switching over to explicit file-locking rather than renaming for synchronization (see also #33974).


2019-12-13T18:18:58-fba2c51/windows-amd64-longtest

--- FAIL: TestGetRef (9.50s)
    api_test.go:191: getting corpus: syncing segment 27: rename C:\Users\gopher\.cache\golang-maintner\tempseg028062994 C:\Users\gopher\.cache\golang-maintner\0027.5c4a6891e9788c963979597b118bc64d1571078489b05b69be0f53be.mutlog: Access is denied.

CC @dmitshur @toothrot @cagedmantis @bradfitz

@bcmills bcmills added this to the Backlog milestone Dec 16, 2019
@gopherbot gopherbot added the Builders label Dec 16, 2019
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@bcmills bcmills commented Feb 20, 2020

https://build.golang.org/log/0420d03897485cb745280248cb0e951b8a866917

--- FAIL: TestGetRef (11.13s)
    api_test.go:191: getting corpus: syncing segment 46: rename C:\Users\gopher\.cache\golang-maintner\tempseg000044895 C:\Users\gopher\.cache\golang-maintner\0046.bb5084c76340045b19e6d06755ef9be321888b1344474d24be5fe494.mutlog: Access is denied.
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@toothrot toothrot commented Feb 20, 2020

Retrying, as robustio does, seems like a good solution.

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@bcmills bcmills commented Feb 20, 2020

If you happen to decide to use explicit file-locking instead, see #33974.

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