On 7/28/20 10:38 PM, Wanpeng Li wrote: > Hi Nitesh， > On Wed, 29 Jul 2020 at 09:00, Wanpeng Li <kernellwp@xxxxxxxxx> wrote: >> On Tue, 28 Jul 2020 at 22:40, Nitesh Narayan Lal <nitesh@xxxxxxxxxx> wrote: >>> Hi, >>> >>> I have recently come across an RCU trace with the 5.8-rc7 kernel that has the >>> debug configs enabled while installing a VM on a CPU that is listed under >>> nohz_full. >>> >>> Based on some of the initial debugging, my impression is that the issue is >>> triggered because of the fastpath that is meant to optimize the writes to x2APIC >>> ICR that eventually leads to a virtual IPI in fixed delivery mode, is getting >>> invoked from the quiescent state. > Could you try latest linux-next tree? I guess maybe some patches are > pending in linux-next tree, I can't reproduce against linux-next tree. Sure, I will try this today. > -- Nitesh
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