Re: [RFC][PATCH 00/12] various perf fixes

[Peter Zijlstra]

On Thu, Jan 14, 2016 at 11:05:50AM +0100, Dmitry Vyukov wrote:
> There is a way to run it without coverage on a local machine.
> 
> First, you need to setup Go toolchain: download latest Go distribution
> from https://golang.org/dl:
> https://storage.googleapis.com/golang/go1.5.3.linux-amd64.tar.gz
> Unpack it to $HOME/go1.5.
> 
> $ export GOROOT=$HOME/go1.5

> $ export GOPATH=$HOME/gopath

So after I put that in a profile.d file:

> Download syzkaller sources:
> 
> $ go get github.com/google/syzkaller

package github.com/google/syzkaller: no buildable Go source files in /root/gopath/src/github.com/google/syzkaller

> Build necessary syzkaller binaries:
> 
> $ cd $GOPATH/src/github.com/google/syzkaller
> $ make

That seems to have done its thing

> Then save the following content into
> $GOPATH/src/github.com/google/syzkaller/perf.cfg
> 

{
	"http": "localhost:50000",
	"workdir": "root/gopath/src/github.com/google/syzkaller/workdir",
	"syzkaller": "/root/gopath/src/github.com/google/syzkaller",
	"vmlinux": "-",
	"type": "local",
	"count": 1,
	"procs": 160,
	"nocover": true,
	"nodropprivs": true,
	"enable_syscalls": [
		"perf_event_open",
		"ioctl$PERF*",
		"prctl$void",
		"bpf$*",
		"sched_yield"
	]
}

> Alter paths as necessary. Also you can change procs parameter (number
> of parallel test processes), something like NCPU*4 would be a good
> number. Also you can add additional syscalls to the mix.

per the above

> Then run:
> 
> $ bin/syz-manager -config perf.cfg
> 
> If you run it on a separate test machine, then scp syzkaller/bin dir
> and perf.cfg to the machine (the syzkaller param in config is where it
> will search for the bin dir).
> 
> If syz-manager does not appear to be doing anything useful, then pleas
> run it in the following mode and post output:
> 
> $ bin/syz-manager -config perf.cfg -v 1 -debug

root@ivb-ep:~/gopath/src/github.com/google/syzkaller# bin/syz-manager -config perf.cfg -v 1 -debug
2016/02/15 17:12:50 bad config syzkaller param: can't find bin/syz-execprog

And its right, no such thing as bin/syz-execprog