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SubjectRe: [syzbot] INFO: task hung in synchronize_rcu (3)
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On 5/10/22 15:45, Sean Christopherson wrote:
>>
>> 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()
>

Are you sure? The hang is in synchronize_*rcu* and the testcase is
unrelated to KVM. It seems like the testcase is not 100% reproducible.

Paolo

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