Messages in this thread | | | Date | Tue, 26 Jan 2021 13:46:19 +0900 | From | Sergey Senozhatsky <> | Subject | Re: [PATCH 0/2] Fix BUG: Invalid wait context in hrtimer_interrupt() |
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On (21/01/23 23:37), Qais Yousef wrote: > > I hit a pr_warn() inside hrtimer_interrupt() which lead to a BUG: Invalid wait > context splat. > > The problem wasn't reproducible but I think the cause is obvious, printk can't > be called from interrupt context. > > AFAICU printk_deferred() is safe from NMI, so I assumed it is safe to be called > from hrtimer_interrupt() too. Adding a pr_warn_once() inside > hrtimer_interrupt() in a location where it is always hit produces the BUG > splat. Replacing it with pr_warn_deferred_once() generates the printk warning > without any splat.
Could you please post the lockdep splat? Why is it invalid? Is this... -rt kernel, perhaps?
-ss
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