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SubjectRe: [PATCH] futex: Handle transient "ownerless" rtmutex state correctly
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On Wed, Nov 04 2020 at 16:12, Thomas Gleixner wrote:

> From: Mike Galbraith <efault@gmx.de>
>
> Gratian managed to trigger the BUG_ON(!newowner) in fixup_pi_state_owner().
> This is one possible chain of events leading to this:
>
> Task Prio Operation
> T1 120 lock(F)
> T2 120 lock(F) -> blocks (top waiter)
> T3 50 (RT) lock(F) -> boosts T3 and blocks (new top waiter)

boosts T1 obviously as Sebastian just pointed out to me. /me pulls the
futex induced brain damage excuse ...

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