linux-kernel - Re: [syzbot] INFO: task hung in synchronize

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Message-ID: <Ynpsc7dRs8tZugpl@google.com>
Date:   Tue, 10 May 2022 13:45:23 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     syzbot <syzbot+0c6da80218456f1edc36@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, davem@...emloft.net, jhs@...atatu.com,
        jiri@...nulli.us, kvm@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        mingo@...e.hu, mlevitsk@...hat.com, netdev@...r.kernel.org,
        pbonzini@...hat.com, peterz@...radead.org,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        vinicius.gomes@...el.com, viro@...iv.linux.org.uk,
        xiyou.wangcong@...il.com
Subject: Re: [syzbot] INFO: task hung in synchronize_rcu (3)

On Tue, May 10, 2022, syzbot wrote:
> syzbot suspects this issue was fixed by commit:
> 
> commit 2d08935682ac5f6bfb70f7e6844ec27d4a245fa4
> Author: Sean Christopherson <seanjc@...gle.com>
> Date:   Fri Apr 15 00:43:41 2022 +0000
> 
>     KVM: x86: Don't re-acquire SRCU lock in complete_emulated_io()
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16dc2e49f00000
> start commit:   ea4424be1688 Merge tag 'mtd/fixes-for-5.17-rc8' of git://g..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=442f8ac61e60a75e
> dashboard link: https://syzkaller.appspot.com/bug?extid=0c6da80218456f1edc36
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1685af9e700000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11b09df1700000
> 
> If the result looks correct, please mark the issue as fixed by replying with:
> 
> #syz fix: KVM: x86: Don't re-acquire SRCU lock in complete_emulated_io()
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

#syz fix: KVM: x86: Don't re-acquire SRCU lock in complete_emulated_io()