[Bug go/59506] New: net FAILs (timeout) on alpha

[Bug go/59506] New: net FAILs (timeout) on alpha

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59506

            Bug ID: 59506
           Summary: net FAILs (timeout) on alpha
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: go
          Assignee: ian at airs dot com
          Reporter: ubizjak at gmail dot com

$ gmake GOTESTFLAGS=--keep net/check
panic: test timed out after 4m0s

goroutine 112 [running]:
testing.$nested6
        ../../../gcc-svn/trunk/libgo/go/testing/testing.go:596
created by time.goFunc
        ../../../gcc-svn/trunk/libgo/go/time/sleep.go:123

goroutine 1 [chan receive]:
testing.RunTests
        ../../../gcc-svn/trunk/libgo/go/testing/testing.go:472
testing.Main
        ../../../gcc-svn/trunk/libgo/go/testing/testing.go:403
main.main
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/_testmain.go:167

goroutine 110 [IO wait]:
net.runtime_pollWait
        ../../../gcc-svn/trunk/libgo/runtime/netpoll.goc:121
net.Wait.pN12_net.pollDesc
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/fd_poll_runtime.go:81
net.WaitWrite.pN12_net.pollDesc
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/fd_poll_runtime.go:90
net.connect.pN9_net.netFD
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/fd_unix.go:86
net.dial.pN9_net.netFD
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/sock_posix.go:121
net.socket
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/sock_posix.go:91
net.internetSocket
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/ipsock_posix.go:136
net.dialTCP
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/tcpsock_posix.go:155
net.dialSingle
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/dial.go:225
net.$nested102
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/dial.go:158
net.dial
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/fd_unix.go:40
net.Dial.pN10_net.Dialer
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/dial.go:165
net.Dial
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/dial.go:138
net.TestSelfConnect
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/dial_test.go:150
testing.tRunner
        ../../../gcc-svn/trunk/libgo/go/testing/testing.go:391
created by testing.RunTests
        ../../../gcc-svn/trunk/libgo/go/testing/testing.go:471

goroutine 13 [chan send]:
net.$nested4
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/dial_test.go:58
created by net.TestDialTimeout
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/dial_test.go:56

[... some 100 goroutines, all with the same backtrace ...]

goroutine 109 [chan send]:
net.$nested4
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/dial_test.go:58
created by net.TestDialTimeout
       
/home/uros/gcc-build/alphaev68-unknown-linux-gnu/libgo/gotest13607/test/dial_test.go:56
Keeping gotest13607
FAIL: net
Makefile:4567: recipe for target 'net/check' failed
gmake: *** [net/check] Error 1

[Bug go/59506] net FAILs (timeout) on alpha

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59506

--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
Created attachment 31438
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31438&action=edit
strace -f output

Some ~30 seconds of strace dump.
>From gcc-bugs-return-437570-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Dec 14 11:31:43 2013
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Subject: [Bug lto/59505] gcc-4.9.0-20131208 can't link glsl_compiler with -flto=4 in -m32 where gcc-4.8.2 works fine
Date: Sat, 14 Dec 2013 11:31:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY505

--- Comment #12 from Markus Trippelsdorf <octoploid at yandex dot com> ---
(In reply to David Kredba from comment #11)
> And I will try your binutils patch.
>
> Do you think that for 4.9.0 GCC release binutils will support
> slim-LTO-objects?
> LTO support for general use in Gentoo will not be enabled without it in my
> opinion. (But maybe if USE/FEATURE lto will be detected they can let
> ebuild/emerge export AS=gcc-as AR=gcc-ar NM=gcc-nm RANLIB=gcc-ranlib to
> environment.)

I'm not sure. I've posted the simple patch a while ago and it was ignored.
BTW the best solution would be if one could install *both* plugins
to the ../lib/bfd-plugins directory and the correct one would be used
automatically. I don't know if anyone is working on that.

[Bug go/59506] net FAILs (timeout) on alpha

[ubizjak at gmail dot com]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="UTF-8", Size: 3996 bytes --]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59506

--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
This is the TestSelfConnect testcase (from net/dial_test.go) problem:

--cut here--
    // Try to connect to that address repeatedly.
    n := 100000
    if testing.Short() {
        n = 1000
    }
    switch runtime.GOOS {
    case "darwin", "dragonfly", "freebsd", "netbsd", "openbsd", "plan9",
"solaris", "windows":
        // Non-Linux systems take a long time to figure
        // out that there is nothing listening on localhost.
        n = 100
    }
    for i := 0; i < n; i++ {
        c, err := Dial("tcp", addr)
        if err == nil {
            c.Close()
            t.Errorf("#%d: Dial %q succeeded", i, addr)
        }
    }
--cut here--

The Dial takes approx a second to timeout on alpha (kernel 3.12.2, glibc 2.15),
so the test with 100000 connections timeouts. Changing the number of
repetitions to 100 "fixes" the test, while trying with 1000 still timeouts.

However, I would like to propose following patch to change Dial to DialTimeout
with a millisecond deterministic timeout:

--cut here--
Index: go/net/dial_test.go
===================================================================
--- go/net/dial_test.go (revision 206123)
+++ go/net/dial_test.go (working copy)
@@ -147,7 +147,7 @@
                n = 100
        }
        for i := 0; i < n; i++ {
-               c, err := Dial("tcp", addr)
+               c, err := DialTimeout("tcp", addr, time.Millisecond)
                if err == nil {
                        c.Close()
                        t.Errorf("#%d: Dial %q succeeded", i, addr)
--cut here--

Patched test succeeds without problems (and would probably succeed for other
special-cased OSes too), while I believe it still correctly tests for
selfconnect misfeature [1],[2].

[1] http://golang.org/issue/2690
[2] http://stackoverflow.com/questions/4949858/
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY564

--- Comment #1 from Egor Suvorov <egor_suvorov at mail dot ru> ---
Created attachment 31483
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id1483&actioníit
Preprocessed source file

[Bug go/59506] net FAILs (timeout) on alpha

[ian at airs dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59506

Ian Lance Taylor <ian at airs dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-12-27
     Ever confirmed|0                           |1

--- Comment #3 from Ian Lance Taylor <ian at airs dot com> ---
Thanks for the suggestion.

https://codereview.appspot.com/39200044

[Bug go/59506] net FAILs (timeout) on alpha

[ian at airs dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59506

Ian Lance Taylor <ian at airs dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from Ian Lance Taylor <ian at airs dot com> ---
Fixed, I hope.