Messages in this thread | | | Date | Tue, 12 Mar 2024 10:24:19 +0000 | From | Daniel Thompson <> | Subject | Re: 答复: 答复: 答 复: [PATCH] kdb: Fix the deadlock issue in KDB debugging. |
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On Tue, Mar 12, 2024 at 10:04:54AM +0000, Liuye wrote: > >On Tue, Mar 12, 2024 at 08:37:11AM +0000, Liuye wrote: > >> I know that you said schedule_work is not NMI save, which is the first > >> issue. Perhaps it can be fixed using irq_work_queue. But even if > >> irq_work_queue is used to implement it, there will still be a deadlock > >> problem because slave cpu1 still has not released the running queue > >> lock of master CPU0. > > > >This doesn't sound right to me. Why do you think CPU1 won't release > >the run queue lock? > > In this example, CPU1 is waiting for CPU0 to release dbg_slave_lock.
That shouldn't be a problem. CPU0 will have released that lock by the time the irq work is dispatched.
Daniel.
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