I am seeing all.bash fail when testing cmd/go with a likely cause being
internal/poll.runtime_pollWait.

I'm trying to build go1.9 (with a change to the heap size), but
all.bash fails as shown below. Is this a known problem? and if it is,
is there a workaround.

thanks

```
panic: test timed out after 3m0s

goroutine 249 [running]:
testing.startAlarm.func1()
        /home/users/dkortschak/go/src/testing/testing.go:1145 +0xf9
created by time.goFunc
        /home/users/dkortschak/go/src/time/sleep.go:170 +0x44

goroutine 1 [chan receive]:
testing.(*T).Run(0xc8401ca000, 0x929b65, 0x2f, 0x945350, 0x48d701)
        /home/users/dkortschak/go/src/testing/testing.go:790 +0x2fc
testing.runTests.func1(0xc8401ca000)
        /home/users/dkortschak/go/src/testing/testing.go:1004 +0x64
testing.tRunner(0xc8401ca000, 0xc840157b80)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
testing.runTests(0xc840109000, 0xb94920, 0xd7, 0xd7, 0x91ed9c)
        /home/users/dkortschak/go/src/testing/testing.go:1002 +0x2d8
testing.(*M).Run(0xc84007df18, 0x4)
        /home/users/dkortschak/go/src/testing/testing.go:921 +0x111
cmd/go_test.TestMain(0xc840157f18)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:141 +0x150
main.main()
        cmd/go/_test/_testmain.go:472 +0xdb

goroutine 5 [syscall, 1 minutes]:
os/signal.signal_recv(0x0)
        /home/users/dkortschak/go/src/runtime/sigqueue.go:131 +0xa6
os/signal.loop()
        /home/users/dkortschak/go/src/os/signal/signal_unix.go:22 +0x22
created by os/signal.init.0
        /home/users/dkortschak/go/src/os/signal/signal_unix.go:28 +0x41

goroutine 9 [chan receive, 1 minutes]:
testing.(*T).Parallel(0xc8401ca0f0)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8400b7b80)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestFileLineInErrorMessages(0xc8401ca0f0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:667 +0x6c
testing.tRunner(0xc8401ca0f0, 0x9451b8)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 10 [chan receive, 1 minutes]:
testing.(*T).Parallel(0xc8401ca1e0)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8400b7cc0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestProgramNameInCrashMessages(0xc8401ca1e0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:681 +0x6c
testing.tRunner(0xc8401ca1e0, 0x945600)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 16 [chan receive, 1 minutes]:
testing.(*T).Parallel(0xc8401ca3c0)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8403ee000)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestGoInstallRebuildsStalePackagesInOtherGOPATH(0xc8401ca3c
0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:873 +0x7d
testing.tRunner(0xc8401ca3c0, 0x945300)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 65 [chan receive, 1 minutes]:
testing.(*T).Parallel(0xc8401ca4b0)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8403ee140)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestGoInstallDetectsRemovedFiles(0xc8401ca4b0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:903 +0x6c
testing.tRunner(0xc8401ca4b0, 0x9452e8)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 37 [chan receive, 1 minutes]:
testing.(*T).Parallel(0xc8402425a0)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8401fadc0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestGoInstallDetectsRemovedFilesInPackageMain(0xc8402425a0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:972 +0x6c
testing.tRunner(0xc8402425a0, 0x9452e0)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 213 [chan receive]:
testing.(*T).Parallel(0xc8402422d0)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8403ee780)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestGoListCmdOnlyShowsCommands(0xc8402422d0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:1636 +0x6f
testing.tRunner(0xc8402422d0, 0x945310)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 109 [chan receive, 1 minutes]:
testing.(*T).Parallel(0xc8401ca960)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8401fa8c0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestNonCanonicalImportPaths(0xc8401ca960)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:1361 +0x6c
testing.tRunner(0xc8401ca960, 0x9455c0)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 219 [chan receive]:
testing.(*T).Parallel(0xc840242780)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8403eec80)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestMultipleGOPATHEntriesReportedSeparately(0xc840242780)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:1684 +0x7d
testing.tRunner(0xc840242780, 0x9455a0)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 221 [chan receive]:
testing.(*T).Parallel(0xc840242960)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8403eef00)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestMentionGOPATHNotOnSecondEntry(0xc840242960)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:1710 +0x80
testing.tRunner(0xc840242960, 0x945590)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 220 [chan receive]:
testing.(*T).Parallel(0xc840242870)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8403eedc0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestMentionGOPATHInFirstGOPATHEntry(0xc840242870)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:1697 +0x80
testing.tRunner(0xc840242870, 0x945588)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 248 [IO wait]:
internal/poll.runtime_pollWait(0x7f9fe0076df0, 0x72, 0x1)
        /home/users/dkortschak/go/src/runtime/netpoll.go:173 +0x57
internal/poll.(*pollDesc).wait(0xc840462478, 0x72, 0xffffffffffffff01,
0xb55040, 0xb51308)
        /home/users/dkortschak/go/src/internal/poll/fd_poll_runtime.go:
85 +0xae
internal/poll.(*pollDesc).waitRead(0xc840462478, 0xc84048c401, 0x200,
0x200)
        /home/users/dkortschak/go/src/internal/poll/fd_poll_runtime.go:
90 +0x3d
internal/poll.(*FD).Read(0xc840462460, 0xc84048c400, 0x200, 0x200, 0x0,
0x0, 0x0)
        /home/users/dkortschak/go/src/internal/poll/fd_unix.go:125
+0x18a
os.(*File).read(0xc8401a6080, 0xc84048c400, 0x200, 0x200, 0x0,
0xc8401d15e8, 0x4e20eb)
        /home/users/dkortschak/go/src/os/file_unix.go:216 +0x4e
os.(*File).Read(0xc8401a6080, 0xc84048c400, 0x200, 0x200, 0x0, 0x0,
0x0)
        /home/users/dkortschak/go/src/os/file.go:103 +0x6d
bytes.(*Buffer).ReadFrom(0xc8401fa488, 0xb53b80, 0xc8401a6080,
0x7f9fe0032028, 0xc8401fa488, 0x1)
        /home/users/dkortschak/go/src/bytes/buffer.go:209 +0x177
io.copyBuffer(0xb52ac0, 0xc8401fa488, 0xb53b80, 0xc8401a6080, 0x0, 0x0,
0x0, 0xc840462280, 0x0, 0x0)
        /home/users/dkortschak/go/src/io/io.go:386 +0x2bb
io.Copy(0xb52ac0, 0xc8401fa488, 0xb53b80, 0xc8401a6080, 0x403703,
0xc8400602a0, 0xc8401d17b0)
        /home/users/dkortschak/go/src/io/io.go:362 +0x68
os/exec.(*Cmd).writerDescriptor.func1(0xc8400602a0, 0xc8401d17b0)
        /home/users/dkortschak/go/src/os/exec/exec.go:264 +0x4d
os/exec.(*Cmd).Start.func1(0xc840460160, 0xc840454280)
        /home/users/dkortschak/go/src/os/exec/exec.go:380 +0x27
created by os/exec.(*Cmd).Start
        /home/users/dkortschak/go/src/os/exec/exec.go:379 +0x646

goroutine 217 [chan receive]:
testing.(*T).Parallel(0xc8402424b0)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8403eea00)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestUnsuccessfulGoInstallShouldMentionMissingPackage(0xc840
2424b0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:1664 +0x6c
testing.tRunner(0xc8402424b0, 0x945698)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 218 [chan receive]:
testing.(*T).Parallel(0xc840242690)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8403eeb40)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestGOROOTSearchFailureReporting(0xc840242690)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:1674 +0x72
testing.tRunner(0xc840242690, 0x9451c0)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 150 [chan receive, 1 minutes]:
testing.(*T).Parallel(0xc840446d20)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8400b77c0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestPackageMainTestImportsArchiveNotBinary(0xc840446d20)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:1423 +0x7d
testing.tRunner(0xc840446d20, 0x9455e0)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 247 [IO wait]:
internal/poll.runtime_pollWait(0x7f9fe0076f70, 0x72, 0x1)
        /home/users/dkortschak/go/src/runtime/netpoll.go:173 +0x57
internal/poll.(*pollDesc).wait(0xc8404623d8, 0x72, 0xffffffffffffff01,
0xb55040, 0xb51308)
        /home/users/dkortschak/go/src/internal/poll/fd_poll_runtime.go:
85 +0xae
internal/poll.(*pollDesc).waitRead(0xc8404623d8, 0xc8402ba401, 0x200,
0x200)
        /home/users/dkortschak/go/src/internal/poll/fd_poll_runtime.go:
90 +0x3d
internal/poll.(*FD).Read(0xc8404623c0, 0xc8402ba400, 0x200, 0x200, 0x0,
0x0, 0x0)
        /home/users/dkortschak/go/src/internal/poll/fd_unix.go:125
+0x18a
os.(*File).read(0xc8401a6068, 0xc8402ba400, 0x200, 0x200, 0x0,
0xc8401d3de8, 0x4e20eb)
        /home/users/dkortschak/go/src/os/file_unix.go:216 +0x4e
os.(*File).Read(0xc8401a6068, 0xc8402ba400, 0x200, 0x200, 0x0, 0x0,
0x0)
        /home/users/dkortschak/go/src/os/file.go:103 +0x6d
bytes.(*Buffer).ReadFrom(0xc8401fa420, 0xb53b80, 0xc8401a6068,
0x7f9fe0032028, 0xc8401fa420, 0x1)
        /home/users/dkortschak/go/src/bytes/buffer.go:209 +0x177
io.copyBuffer(0xb52ac0, 0xc8401fa420, 0xb53b80, 0xc8401a6068, 0x0, 0x0,
0x0, 0xc8404621e0, 0x0, 0x0)
        /home/users/dkortschak/go/src/io/io.go:386 +0x2bb
io.Copy(0xb52ac0, 0xc8401fa420, 0xb53b80, 0xc8401a6068, 0x403703,
0xc8400602a0, 0xc8401d3fb0)
        /home/users/dkortschak/go/src/io/io.go:362 +0x68
os/exec.(*Cmd).writerDescriptor.func1(0xc8400602a0, 0xc8401d3fb0)
        /home/users/dkortschak/go/src/os/exec/exec.go:264 +0x4d
os/exec.(*Cmd).Start.func1(0xc840460160, 0xc840454240)
        /home/users/dkortschak/go/src/os/exec/exec.go:380 +0x27
created by os/exec.(*Cmd).Start
        /home/users/dkortschak/go/src/os/exec/exec.go:379 +0x646

goroutine 210 [chan receive]:
testing.(*T).Parallel(0xc840242000)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8403ee3c0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestGoTestWithPackageListedMultipleTimes(0xc840242000)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:1606 +0x6c
testing.tRunner(0xc840242000, 0x9453c0)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 212 [chan receive]:
testing.(*T).Parallel(0xc8402421e0)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8403ee640)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestGoListStdDoesNotIncludeCommands(0xc8402421e0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:1628 +0x6c
testing.tRunner(0xc8402421e0, 0x945330)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 246 [syscall]:
syscall.Syscall6(0xf7, 0x1, 0x207f, 0xc84040fb78, 0x1000004, 0x0, 0x0,
0x0, 0x0, 0x0)
        /home/users/dkortschak/go/src/syscall/asm_linux_amd64.s:44 +0x5
os.(*Process).blockUntilWaitable(0xc840456780, 0xc840456780, 0x0, 0x0)
        /home/users/dkortschak/go/src/os/wait_waitid.go:31 +0xa5
os.(*Process).wait(0xc840456780, 0xc840158700, 0xc840460238, 0x6)
        /home/users/dkortschak/go/src/os/exec_unix.go:22 +0x42
os.(*Process).Wait(0xc840456780, 0x0, 0x0, 0x945f10)
        /home/users/dkortschak/go/src/os/exec.go:115 +0x2b
os/exec.(*Cmd).Wait(0xc840460160, 0x0, 0x0)
        /home/users/dkortschak/go/src/os/exec/exec.go:446 +0x62
os/exec.(*Cmd).Run(0xc840460160, 0x2b, 0xc840060360)
        /home/users/dkortschak/go/src/os/exec/exec.go:289 +0x5c
cmd/go_test.(*testgoData).doRun(0xc8401fa3c0, 0xc840060360, 0x6, 0x6,
0x0, 0x915c70)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:317 +0x425
cmd/go_test.(*testgoData).run(0xc8401fa3c0, 0xc840060360, 0x6, 0x6)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:332 +0x5c
cmd/go_test.TestGoTestCpuprofileDashOControlsBinaryLocation(0xc8401ca78
0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:1866 +0x17b
testing.tRunner(0xc8401ca780, 0x945350)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 211 [chan receive]:
testing.(*T).Parallel(0xc8402420f0)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8403ee500)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestGoListHasAConsistentOrder(0xc8402420f0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:1616 +0x6c
testing.tRunner(0xc8402420f0, 0x945320)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 222 [chan receive]:
testing.(*T).Parallel(0xc840242a50)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8403ef040)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestDefaultGOPATH(0xc840242a50)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:1733 +0x6c
testing.tRunner(0xc840242a50, 0x945180)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de

goroutine 242 [chan receive]:
testing.(*T).Parallel(0xc8401ca5a0)
        /home/users/dkortschak/go/src/testing/testing.go:677 +0x127
cmd/go_test.(*testgoData).parallel(0xc8401fa140)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:218 +0x382
cmd/go_test.TestLdflagsArgumentsWithSpacesIssue3941(0xc8401ca5a0)
        /home/users/dkortschak/go/src/cmd/go/go_test.go:1840 +0x6c
testing.tRunner(0xc8401ca5a0, 0x9454e8)
        /home/users/dkortschak/go/src/testing/testing.go:746 +0xd0
created by testing.(*T).Run
        /home/users/dkortschak/go/src/testing/testing.go:789 +0x2de
FAIL    cmd/go  203.131s
```

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