linux-kernel - Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer

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Date:	Tue, 8 Mar 2016 16:29:24 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>,
	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Wang Nan <wangnan0@...wei.com>, mingo@...hat.com,
	linux-kernel@...r.kernel.org, He Kuang <hekuang@...wei.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Zefan Li <lizefan@...wei.com>, pi3orama@....com
Subject: Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer


* Peter Zijlstra <peterz@...radead.org> wrote:

> Here's a thread on syz-kaller:
> 
>   lkml.kernel.org/r/CACT4Y+Ym0TZLkmRrM0ZGgLpu8kqS-YjoWTMrvaLz=tx2tnyO3w@...l.gmail.com
> 
> If things have shifted again I'm sure Dmitry is willing to help.

So I tried to install 'go' but it's a _really_ unintuitive tool I have to say.

I installed golang-go on Ubuntu, which gave me a 'go' command:

  triton:~> go version
  go version go1.5.1 linux/amd64

that was the only step that worked. It's a dead end from that point on:

 triton:~> go get github.com/google/syzkaller
 package github.com/google/syzkaller: cannot download, $GOPATH not set. For more details see: go help gopath

ok, so lets set GOPATH to the distro src directory:

 triton:~> export GOPATH=/usr/lib/go/src/
 triton:~> go get github.com/google/syzkaller
 package github.com/google/syzkaller: mkdir /usr/lib/go/src/src: permission denied

btw., this is what the directory contains:

 triton:~> ls /usr/lib/go/src/
 all.bash          bootstrap.bash  bytes       compress   debug     flag  html      io            make.bat   nacltest.bash  race.bash  run.bash  strconv  testing  unsafe
 all.bat           bufio           clean.bash  container  encoding  fmt   image     iostest.bash  Make.dist  net            race.bat   run.bat   strings  text
 androidtest.bash  buildall.bash   clean.bat   crypto     errors    go    index     log           math       os             reflect    runtime   sync     time
 archive           builtin         cmd         database   expvar    hash  internal  make.bash     mime       path           regexp     sort      syscall  unicode

so, according to the error message it wants a writable directory. Lets try it that 
way:

 triton:~> mkdir go
 triton:~> 
 triton:~> export GOPATH=/home/mingo/go/
 triton:~> go get github.com/google/syzkaller
 can't load package: package github.com/google/syzkaller: no buildable Go source files in /home/mingo/go/src/github.com/google/syzkaller


looks like someone wants 'Go' to be used as little as possible! ;-)

Thanks,

	Ingo