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Re: [PATCH] futex: move debug_rt_mutex_free_waiter() further down

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On 2017-03-08 16:29:02 [+0100], To Peter Zijlstra wrote:
> Without this, futex_requeue_pi_signal_restart will trigger
> 
> |kernel BUG at locking/rtmutex_common.h:55!
> |Call Trace:
> | rt_mutex_cleanup_proxy_lock+0x54/0x90
> | futex_wait_requeue_pi.constprop.21+0x387/0x4d0
> | do_futex+0x289/0xbf0
> |RIP: remove_waiter+0x157/0x170 RSP: ffffc90000e0fbe0
> 
> with BUG 2222222222222222 != pointer once this patch is applied.

My wording is wrong. This BUG_ON() statement described here in this
patch (together with the test case mentioned) will trigger once

 "[PATCH -v5 12/14] futex,rt_mutex: Restructure rt_mutex_finish_proxy_lock()"

is applied.

Sebastian

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[PATCH -v5 00/14] the saga of FUTEX_UNLOCK_PI wobbles continues Peter Zijlstra <peterz@infradead.org> - 2017-03-04 11:10 +0100
  [PATCH -v5 02/14] futex: Add missing error handling to FUTEX_REQUEUE_PI Peter Zijlstra <peterz@infradead.org> - 2017-03-04 11:10 +0100
  [PATCH -v5 04/14] futex: Use smp_store_release() in mark_wake_futex() Peter Zijlstra <peterz@infradead.org> - 2017-03-04 11:10 +0100
  [PATCH -v5 10/14] futex: Pull rt_mutex_futex_unlock() out from under hb->lock Peter Zijlstra <peterz@infradead.org> - 2017-03-04 11:10 +0100
    Re: [PATCH -v5 10/14] futex: Pull rt_mutex_futex_unlock() out from  under hb->lock Thomas Gleixner <tglx@linutronix.de> - 2017-03-07 19:20 +0100
      Re: [PATCH -v5 10/14] futex: Pull rt_mutex_futex_unlock() out from  under hb->lock Peter Zijlstra <peterz@infradead.org> - 2017-03-07 19:50 +0100
  [PATCH -v5 14/14] futex: futex_unlock_pi() determinism Peter Zijlstra <peterz@infradead.org> - 2017-03-04 11:10 +0100
    Re: [PATCH -v5 14/14] futex: futex_unlock_pi() determinism Thomas Gleixner <tglx@linutronix.de> - 2017-03-07 15:40 +0100
      Re: [PATCH -v5 14/14] futex: futex_unlock_pi() determinism Peter Zijlstra <peterz@infradead.org> - 2017-03-07 19:50 +0100
      Re: [PATCH -v5 14/14] futex: futex_unlock_pi() determinism Peter Zijlstra <peterz@infradead.org> - 2017-03-13 10:30 +0100
        Re: [PATCH -v5 14/14] futex: futex_unlock_pi() determinism Thomas Gleixner <tglx@linutronix.de> - 2017-03-13 15:30 +0100
          Re: [PATCH -v5 14/14] futex: futex_unlock_pi() determinism Peter Zijlstra <peterz@infradead.org> - 2017-03-13 16:20 +0100
  [PATCH -v5 11/14] futex,rt_mutex: Introduce rt_mutex_init_waiter() Peter Zijlstra <peterz@infradead.org> - 2017-03-04 11:10 +0100
  [PATCH -v5 07/14] futex: Change locking rules Peter Zijlstra <peterz@infradead.org> - 2017-03-04 11:10 +0100
    Re: [PATCH -v5 07/14] futex: Change locking rules Thomas Gleixner <tglx@linutronix.de> - 2017-03-07 14:50 +0100
      Re: [PATCH -v5 07/14] futex: Change locking rules Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2017-03-07 18:20 +0100
        Re: [PATCH -v5 07/14] futex: Change locking rules Peter Zijlstra <peterz@infradead.org> - 2017-03-07 19:10 +0100
  [PATCH -v5 06/14] futex,rt_mutex: Provide futex specific rt_mutex API Peter Zijlstra <peterz@infradead.org> - 2017-03-04 11:50 +0100
  [PATCH -v5 05/14] futex: Remove rt_mutex_deadlock_account_*() Peter Zijlstra <peterz@infradead.org> - 2017-03-04 11:50 +0100
  [PATCH -v5 08/14] futex: Cleanup refcounting Peter Zijlstra <peterz@infradead.org> - 2017-03-04 12:50 +0100
  [PATCH -v5 03/14] futex: Cleanup variable names for futex_top_waiter() Peter Zijlstra <peterz@infradead.org> - 2017-03-04 12:50 +0100
  [PATCH -v5 12/14] futex,rt_mutex: Restructure rt_mutex_finish_proxy_lock() Peter Zijlstra <peterz@infradead.org> - 2017-03-04 12:50 +0100
    Re: [PATCH -v5 12/14] futex,rt_mutex: Restructure  rt_mutex_finish_proxy_lock() Thomas Gleixner <tglx@linutronix.de> - 2017-03-07 15:50 +0100
      Re: [PATCH -v5 12/14] futex,rt_mutex: Restructure  rt_mutex_finish_proxy_lock() Thomas Gleixner <tglx@linutronix.de> - 2017-03-07 19:50 +0100
      Re: [PATCH -v5 12/14] futex,rt_mutex: Restructure  rt_mutex_finish_proxy_lock() Peter Zijlstra <peterz@infradead.org> - 2017-03-07 19:50 +0100
    [PATCH] futex: move debug_rt_mutex_free_waiter() further down Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2017-03-08 16:40 +0100
      Re: [PATCH] futex: move debug_rt_mutex_free_waiter() further down Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2017-03-08 16:40 +0100
        Re: [PATCH] futex: move debug_rt_mutex_free_waiter() further down Steven Rostedt <rostedt@goodmis.org> - 2017-03-08 17:40 +0100
      Re: [PATCH] futex: move debug_rt_mutex_free_waiter() further down Steven Rostedt <rostedt@goodmis.org> - 2017-03-08 17:30 +0100
      Re: [PATCH] futex: move debug_rt_mutex_free_waiter() further down Peter Zijlstra <peterz@infradead.org> - 2017-03-13 10:20 +0100

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