Messages in this thread | | | Date | Sat, 23 Feb 2019 11:38:09 +0100 | From | Borislav Petkov <> | Subject | Re: WARNING in rcu_check_gp_start_stall |
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On Sat, Feb 23, 2019 at 11:33:33AM +0100, Dmitry Vyukov wrote: > On Fri, Feb 22, 2019 at 11:20 PM Borislav Petkov <bp@alien8.de> wrote: > > > > On Fri, Feb 22, 2019 at 09:10:04AM -0800, syzbot wrote: > > > Hello, > > > > > > syzbot found the following crash on: > > > > > > HEAD commit: 8a61716ff2ab Merge tag 'ceph-for-5.0-rc8' of git://github... > > > git tree: upstream > > > console output: https://syzkaller.appspot.com/x/log.txt?x=1531dd3f400000 > > > kernel config: https://syzkaller.appspot.com/x/.config?x=7132344728e7ec3f > > > dashboard link: https://syzkaller.appspot.com/bug?extid=111bc509cd9740d7e4aa > > > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d4966cc00000 > > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10c492d0c00000 > > > > So I ran this for more than an hour in a guest here with the above > > .config but nothing happened. The compiler I used is 8.2, dunno of that > > makes the difference or I'm missing something else... > > I was able to reproduce this on the first run: > > # ./syz-execprog -procs=8 -repeat=0 hang
Ok, this is what I'm missing: I ran the reproducer directly but you run a multithreaded thing with this syz-execprog. Where do I get that syz- thing?
> There is a bunch of other bug reports about hangs where reproducers > mention perf_event_open and sched_setattr.
This is a known issue, says peterz.
-- Regards/Gruss, Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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