Re: INFO: task hung in synchronize_rcu

[syzbot]

syzbot has bisected this bug to:

commit 9121923c457d1d8667a6e3a67302c29e5c5add6b
Author: Jim Mattson <jmattson@xxxxxxxxxx>
Date:   Thu Oct 24 23:03:26 2019 +0000

    kvm: Allocate memslots and buses before calling kvm_arch_init_vm

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14b34f5ce00000
start commit:   9d234505 Merge tag 'hwmon-for-v5.4-rc6' of git://git.kerne..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=16b34f5ce00000
console output: https://syzkaller.appspot.com/x/log.txt?x=12b34f5ce00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cbbed3e8d4eb64bf
dashboard link: https://syzkaller.appspot.com/bug?extid=89a8060879fa0bd2db4f
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13509b84e00000

Reported-by: syzbot+89a8060879fa0bd2db4f@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 9121923c457d ("kvm: Allocate memslots and buses before calling  
kvm_arch_init_vm")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection