search for: trace_lock_

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2020 Aug 11
2
[PATCH] x86/paravirt: Add missing noinstr to arch_local*() helpers
On 11.08.20 10:12, Peter Zijlstra wrote: > On Tue, Aug 11, 2020 at 09:57:55AM +0200, J?rgen Gro? wrote: >> On 11.08.20 09:41, Peter Zijlstra wrote: >>> On Fri, Aug 07, 2020 at 05:19:03PM +0200, Marco Elver wrote: >>> >>>> My hypothesis here is simply that kvm_wait() may be called in a place >>>> where we get the same case I mentioned to Peter,
2020 Aug 11
2
[PATCH] x86/paravirt: Add missing noinstr to arch_local*() helpers
On 11.08.20 10:12, Peter Zijlstra wrote: > On Tue, Aug 11, 2020 at 09:57:55AM +0200, J?rgen Gro? wrote: >> On 11.08.20 09:41, Peter Zijlstra wrote: >>> On Fri, Aug 07, 2020 at 05:19:03PM +0200, Marco Elver wrote: >>> >>>> My hypothesis here is simply that kvm_wait() may be called in a place >>>> where we get the same case I mentioned to Peter,
2020 Aug 11
3
[PATCH] x86/paravirt: Add missing noinstr to arch_local*() helpers
...t is, most of these irq-tracking problem are new because commit: 859d069ee1dd ("lockdep: Prepare for NMI IRQ state tracking") changed irq-tracking to ignore the lockdep recursion count. This then allows: lock_acquire() raw_local_irq_save(); current->lockdep_recursion++; trace_lock_acquire() ... tracing ... #PF under raw_local_irq_*() __lock_acquire() arch_spin_lock(&graph_lock) pv-spinlock-wait() local_irq_save() under raw_local_irq_*() However afaict that just made a bad situation worse. There already were issues, take for example:...
2020 Aug 11
3
[PATCH] x86/paravirt: Add missing noinstr to arch_local*() helpers
...t is, most of these irq-tracking problem are new because commit: 859d069ee1dd ("lockdep: Prepare for NMI IRQ state tracking") changed irq-tracking to ignore the lockdep recursion count. This then allows: lock_acquire() raw_local_irq_save(); current->lockdep_recursion++; trace_lock_acquire() ... tracing ... #PF under raw_local_irq_*() __lock_acquire() arch_spin_lock(&graph_lock) pv-spinlock-wait() local_irq_save() under raw_local_irq_*() However afaict that just made a bad situation worse. There already were issues, take for example:...