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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: tglx@linutronix.de, mingo@kernel.org, juri.lelli@arm.com,
	rostedt@goodmis.org, xlpang@redhat.com,
	linux-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com,
	jdesfossez@efficios.com, bristot@redhat.com,
	dvhart@infradead.org
Subject: Re: [PATCH] futex: move debug_rt_mutex_free_waiter() further down
Date: Wed, 8 Mar 2017 16:37:32 +0100	[thread overview]
Message-ID: <20170308153731.z3vjtb24h75eyv4u@linutronix.de> (raw)
In-Reply-To: <20170308152901.kumylhi7l3hescxd@linutronix.de>

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

  reply	other threads:[~2017-03-08 15:39 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-04  9:27 [PATCH -v5 00/14] the saga of FUTEX_UNLOCK_PI wobbles continues Peter Zijlstra
2017-03-04  9:27 ` [PATCH -v5 01/14] futex: Fix potential use-after-free in FUTEX_REQUEUE_PI Peter Zijlstra
2017-03-14 20:48   ` [tip:locking/urgent] " tip-bot for Peter Zijlstra
2017-03-04  9:27 ` [PATCH -v5 02/14] futex: Add missing error handling to FUTEX_REQUEUE_PI Peter Zijlstra
2017-03-14 20:49   ` [tip:locking/urgent] " tip-bot for Peter Zijlstra
2017-03-04  9:27 ` [PATCH -v5 03/14] futex: Cleanup variable names for futex_top_waiter() Peter Zijlstra
2017-03-04  9:27 ` [PATCH -v5 04/14] futex: Use smp_store_release() in mark_wake_futex() Peter Zijlstra
2017-03-04  9:27 ` [PATCH -v5 05/14] futex: Remove rt_mutex_deadlock_account_*() Peter Zijlstra
2017-03-04  9:27 ` [PATCH -v5 06/14] futex,rt_mutex: Provide futex specific rt_mutex API Peter Zijlstra
2017-03-04  9:27 ` [PATCH -v5 07/14] futex: Change locking rules Peter Zijlstra
2017-03-07 13:22   ` Thomas Gleixner
2017-03-07 16:47     ` Sebastian Andrzej Siewior
2017-03-07 18:01       ` Peter Zijlstra
2017-03-04  9:27 ` [PATCH -v5 08/14] futex: Cleanup refcounting Peter Zijlstra
2017-03-04  9:27 ` [PATCH -v5 09/14] futex: Rework inconsistent rt_mutex/futex_q state Peter Zijlstra
2017-03-07 13:26   ` Thomas Gleixner
2017-03-04  9:27 ` [PATCH -v5 10/14] futex: Pull rt_mutex_futex_unlock() out from under hb->lock Peter Zijlstra
2017-03-07 14:08   ` Thomas Gleixner
2017-03-07 18:01     ` Peter Zijlstra
2017-03-04  9:27 ` [PATCH -v5 11/14] futex,rt_mutex: Introduce rt_mutex_init_waiter() Peter Zijlstra
2017-03-04  9:27 ` [PATCH -v5 12/14] futex,rt_mutex: Restructure rt_mutex_finish_proxy_lock() Peter Zijlstra
2017-03-07 14:18   ` Thomas Gleixner
2017-03-07 17:57     ` Peter Zijlstra
2017-03-07 17:59       ` Thomas Gleixner
2017-03-08 15:29   ` [PATCH] futex: move debug_rt_mutex_free_waiter() further down Sebastian Andrzej Siewior
2017-03-08 15:37     ` Sebastian Andrzej Siewior [this message]
2017-03-08 16:21       ` Steven Rostedt
2017-03-08 16:20     ` Steven Rostedt
2017-03-13  9:16     ` Peter Zijlstra
2017-03-04  9:27 ` [PATCH -v5 13/14] futex: Rework futex_lock_pi() to use rt_mutex_*_proxy_lock() Peter Zijlstra
2017-03-04  9:27 ` [PATCH -v5 14/14] futex: futex_unlock_pi() determinism Peter Zijlstra
2017-03-07 14:31   ` Thomas Gleixner
2017-03-07 17:59     ` Peter Zijlstra
2017-03-13  9:25     ` Peter Zijlstra
2017-03-13 14:25       ` Thomas Gleixner
2017-03-13 15:11         ` Peter Zijlstra

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