Messages in this thread | | | From | Dmitry Vyukov <> | Date | Mon, 15 Feb 2016 18:45:59 +0100 | Subject | Re: [RFC][PATCH 00/12] various perf fixes |
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On Mon, Feb 15, 2016 at 6:07 PM, Peter Zijlstra <peterz@infradead.org> wrote: > On Mon, Feb 15, 2016 at 06:04:15PM +0100, Dmitry Vyukov wrote: >> There is something wrong and I guess it is not actually working. >> Please post your config file so that I can double check. In >> particular, did you set "cover": false? > > > { > "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, > "cover": false, > "dropprivs": false, > "enable_syscalls": [ > "perf_event_open", > "ioctl$PERF*", > "prctl$void", > "bpf$*", > "sched_yield" > ] > }
Ah, OK, it's actually working, everything is fine. You can double check it by executing:
$ curl http://localhost:50000 | grep "exec total"
On my machine it produces (this is number of executed test programs per second): exec total: 1196/sec<br>
However, you need to add getpid and gettid syscalls to the list of enabled syscalls in config (they are required for perf_event_open):
"enable_syscalls": [ "getpid", "gettid", "perf_event_open", "ioctl$PERF*", "prctl$void", "bpf$*", "sched_yield" ]
(you can also add few other syscalls if you think they can be relevant, but I am able to trigger perf crashes with just these)
And note that syz-manager binary won't notify you about any crashes, you need to look in dmesg (and maybe at hanged processes).
I've collected some corpus of perf-related programs with coverage in my setup. If you extract the attached archive into root/gopath/src/github.com/google/syzkaller/workdir/corpus/ dir, it should significantly speed up triggering of bugs (note that you did not add / in front of the path, so it should be in your cwd). While collecting the corpus I've triggered whole lot of crashes in few minutes: https://gist.githubusercontent.com/dvyukov/9433b40adb094cc22cf2/raw/8642ad53ea44f604168189c568b419ba498dd5f3/gistfile1.txt [unhandled content-type:application/zip] | |