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Groups > linux.kernel > #1631489
| From | Paolo Bonzini <pbonzini@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: kernel/rcu/tree.c:1031 rcu_irq_enter() invoked with irqs enabled!!!! |
| Date | 2017-04-26 16:40 +0200 |
| Message-ID | <tAwgO-3vw-7@gated-at.bofh.it> (permalink) |
| References | <tAf6i-Vi-23@gated-at.bofh.it> <tAffY-Yq-31@gated-at.bofh.it> <tApoZ-7rG-7@gated-at.bofh.it> <tAvXr-3oc-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 26/04/2017 16:18, Radim Krčmář wrote: >> OK, but looking at the stack trace, this has nothing to do with ext4. The >> problem seems to be in KVM - relevant CCs added. > The path begins with async_page_fault interrupt gate and the hardware > should clear the interrupt flag before executing it. I don't see a > change that would break the assumption that interrupts are disabled ... native_safe_halt enables interrupts. I think this is it: diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 14f65a5f938e..2a7835932b71 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -161,8 +161,8 @@ void kvm_async_pf_task_wait(u32 token) */ rcu_irq_exit(); native_safe_halt(); - rcu_irq_enter(); local_irq_disable(); + rcu_irq_enter(); } } if (!n.halted) Paolo
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kernel/rcu/tree.c:1031 rcu_irq_enter() invoked with irqs enabled!!!! Ross Zwisler <ross.zwisler@linux.intel.com> - 2017-04-25 22:20 +0200
Re: kernel/rcu/tree.c:1031 rcu_irq_enter() invoked with irqs enabled!!!! "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-25 22:30 +0200
Re: kernel/rcu/tree.c:1031 rcu_irq_enter() invoked with irqs enabled!!!! Jan Kara <jack@suse.cz> - 2017-04-26 09:20 +0200
Re: kernel/rcu/tree.c:1031 rcu_irq_enter() invoked with irqs enabled!!!! Radim Krčmář <rkrcmar@redhat.com> - 2017-04-26 16:20 +0200
Re: kernel/rcu/tree.c:1031 rcu_irq_enter() invoked with irqs enabled!!!! Paolo Bonzini <pbonzini@redhat.com> - 2017-04-26 16:40 +0200
Re: kernel/rcu/tree.c:1031 rcu_irq_enter() invoked with irqs enabled!!!! Radim Krčmář <rkrcmar@redhat.com> - 2017-04-26 16:50 +0200
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