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net: TestLookupHostCancel and TestCloseRead flaky on Yosemite #25694

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bcmills opened this issue Jun 1, 2018 · 3 comments
Closed

net: TestLookupHostCancel and TestCloseRead flaky on Yosemite #25694

bcmills opened this issue Jun 1, 2018 · 3 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. OS-Darwin
Milestone
Go1.11

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@bcmills
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bcmills commented Jun 1, 2018 •
edited

Examples:
https://build.golang.org/log/63ea433daf839bebe655c49e196c359e83586e88
https://build.golang.org/log/460d2123fc01822ebd2bb6a224e2dedaaaebbaa7
https://build.golang.org/log/49bc59d02f5575c538997f59602d727617c3723e

All with this failure mode:

--- FAIL: TestLookupHostCancel (0.80s)
    lookup_test.go:923: lookup www.google.com: no such host
--- FAIL: TestCloseRead (0.00s)
panic: open /var/folders/6g/8k13h11n2zb8hxx99wk6f6y40000gn/T/go-nettest731919775: too many open files [recovered]
	panic: open /var/folders/6g/8k13h11n2zb8hxx99wk6f6y40000gn/T/go-nettest731919775: too many open files

goroutine 2188 [running]:
testing.tRunner.func1(0xc0000b6200)
	/var/folders/6g/8k13h11n2zb8hxx99wk6f6y40000gn/T/workdir/go/src/testing/testing.go:792 +0x387
panic(0x124af40, 0xc00066b2c0)
	/var/folders/6g/8k13h11n2zb8hxx99wk6f6y40000gn/T/workdir/go/src/runtime/panic.go:494 +0x1b9
net.testUnixAddr(0x1285969, 0x4)
	/var/folders/6g/8k13h11n2zb8hxx99wk6f6y40000gn/T/workdir/go/src/net/mockserver_test.go:23 +0xc3
net.newLocalListener(0x1285969, 0x4, 0x1, 0x1, 0x0, 0x12ca1e0)
	/var/folders/6g/8k13h11n2zb8hxx99wk6f6y40000gn/T/workdir/go/src/net/mockserver_test.go:51 +0x2d5
net.TestCloseRead(0xc0000b6200)
	/var/folders/6g/8k13h11n2zb8hxx99wk6f6y40000gn/T/workdir/go/src/net/net_test.go:30 +0xcf
testing.tRunner(0xc0000b6200, 0x1296b78)
	/var/folders/6g/8k13h11n2zb8hxx99wk6f6y40000gn/T/workdir/go/src/testing/testing.go:827 +0xbf
created by testing.(*T).Run
	/var/folders/6g/8k13h11n2zb8hxx99wk6f6y40000gn/T/workdir/go/src/testing/testing.go:878 +0x353
FAIL	net	2.369s
@bcmills bcmills changed the title net: TestLookupHostCancel and TestCloseRead flaky on D net: TestLookupHostCancel and TestCloseRead flaky on Yosemite Jun 1, 2018
@bcmills bcmills added OS-Darwin NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels Jun 1, 2018
@bcmills bcmills added this to the Go1.11 milestone Jun 1, 2018
@bcmills
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bcmills commented Jun 1, 2018

CC: @mikioh @bradfitz @ianlancetaylor

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bradfitz commented Jun 5, 2018

I think these are all just ulimit issues. I recall from a previous bug that "no such host" is a red herring... it's really just some socket creation error in the DNS lookup process.

I suspect the net package has grown parallel enough that we're up against the Mac's low limits.

We should probably have the buildlet crank up the limit on start-up.

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Change https://golang.org/cl/121176 mentions this issue: net: limit concurrent threads to limit on file descriptors

@ianlancetaylor ianlancetaylor mentioned this issue Oct 19, 2018
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