linux-kernel - Re: INFO: task hung in synchronize

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Date:   Sun, 03 Nov 2019 04:11:00 -0800
From:   syzbot <syzbot+89a8060879fa0bd2db4f@...kaller.appspotmail.com>
To:     bp@...en8.de, hpa@...or.com, jmattson@...gle.com, joro@...tes.org,
        junaids@...gle.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        pbonzini@...hat.com, rkrcmar@...hat.com,
        sean.j.christopherson@...el.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, vkuznets@...hat.com, wanpengli@...cent.com,
        x86@...nel.org
Subject: Re: INFO: task hung in synchronize_rcu

syzbot has bisected this bug to:

commit 9121923c457d1d8667a6e3a67302c29e5c5add6b
Author: Jim Mattson <jmattson@...gle.com>
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@...kaller.appspotmail.com
Fixes: 9121923c457d ("kvm: Allocate memslots and buses before calling  
kvm_arch_init_vm")

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