On Wed, Aug 22, 2018 at 2:08 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > On Tue, Aug 21, 2018 at 02:28:02PM -0700, syzbot wrote: >> syzbot has found a reproducer for the following crash on: >> >> HEAD commit: 778a33959a8a Merge tag 'please-pull-noboot' of git://git.k.. >> git tree: upstream >> console output: https://syzkaller.appspot.com/x/log.txt?x=14a5385a400000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=214e4990bd49329f >> dashboard link: https://syzkaller.appspot.com/bug?extid=1f56df64bfb3c29dde6f >> compiler: gcc (GCC) 8.0.1 20180413 (experimental) >> userspace arch: i386 >> syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=13ffa561400000 > > FWIW the lack of whitespace between "repro:" and the URL makes it hard > to copy paste. Fixed by: https://github.com/google/syzkaller/commit/307deaee5e23e4585d4b408ebcf329b9dc8ebdb4 Thanks >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10023961400000 > > >> RIP: 0010:__fire_sched_in_preempt_notifiers kernel/sched/core.c:2481 > > That repro thing does something dodgy with KVM, which then corrupts the > premption notifier thing. I'm sufficiently KVM clueless to not really > know where to start looking though..
