linux-kernel - Re: [KVM] fdd90b978b: WARNING:suspicious_RCU

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Message-ID: <4a0d36bf1d8265aa2692d7d1b33d724fe7a98849.camel@infradead.org>
Date:   Tue, 22 Dec 2020 09:42:11 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     0day robot <lkp@...el.com>, LKML <linux-kernel@...r.kernel.org>,
        lkp@...ts.01.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Ankur Arora <ankur.a.arora@...cle.com>,
        Joao Martins <joao.m.martins@...cle.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Sean Christopherson <seanjc@...gle.com>, graf@...zon.com,
        iaslan@...zon.de
Subject: Re: [KVM]  fdd90b978b: WARNING:suspicious_RCU_usage

On Tue, 2020-12-22 at 13:06 +0800, kernel test robot wrote:
> 
> kern  :warn  : [   86.138096] WARNING: suspicious RCU usage
> kern  :warn  : [   86.142286] 5.10.0-rc5-gfdd90b978b4e #1 Tainted: G          I      
> kern  :warn  : [   86.148879] -----------------------------
> kern  :warn  : [   86.153110] include/linux/kvm_host.h:633 suspicious rcu_dereference_check() usage!
> kern  :warn  : [   86.160992] 
>                               other info that might help us debug this:
> 
> kern  :warn  : [   86.169413] 
>                               rcu_scheduler_active = 2, debug_locks = 1
> kern  :warn  : [   86.176231] no locks held by xen_shinfo_test/10611.
> kern  :warn  : [   86.181328] 
>                               stack backtrace:
> kern  :warn  : [   86.185946] CPU: 2 PID: 10611 Comm: xen_shinfo_test Tainted: G          I       5.10.0-rc5-gfdd90b978b4e #1
> kern  :warn  : [   86.196092] Hardware name:  /NUC6i7KYB, BIOS KYSKLi70.86A.0041.2016.0817.1130 08/17/2016
> kern  :warn  : [   86.204517] Call Trace:
> kern  :warn  : [   86.207122]  dump_stack+0x8d/0xb5
> kern  :warn  : [   86.210615]  kvm_map_gfn+0xbb/0xc0
> kern  :warn  : [   86.214127]  kvm_xen_map_guest_page+0x5c/0x100
> kern  :warn  : [   86.218787]  kvm_xen_hvm_set_attr+0xf8/0x1c0
> kern  :warn  : [   86.223275]  kvm_arch_vm_ioctl+0xae9/0xc80


Thanks. FWIW all this mapping code was removed in the last version of
the series.

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