From: Thomas Gleixner <tglx@linutronix.de>
To: alexander.levin@verizon.com
Cc: Peter Zijlstra <peterz@infradead.org>,
"mingo@kernel.org" <mingo@kernel.org>,
"juri.lelli@arm.com" <juri.lelli@arm.com>,
"rostedt@goodmis.org" <rostedt@goodmis.org>,
"xlpang@redhat.com" <xlpang@redhat.com>,
"bigeasy@linutronix.de" <bigeasy@linutronix.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"mathieu.desnoyers@efficios.com" <mathieu.desnoyers@efficios.com>,
"jdesfossez@efficios.com" <jdesfossez@efficios.com>,
"bristot@redhat.com" <bristot@redhat.com>,
"dvhart@infradead.org" <dvhart@infradead.org>
Subject: Re: [PATCH -v6 11/13] futex: Rework futex_lock_pi() to use rt_mutex_*_proxy_lock()
Date: Mon, 10 Apr 2017 18:03:36 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.20.1704101802370.2906@nanos> (raw)
In-Reply-To: <20170410155146.ivj3vggoacrzq624@sasha-lappy>
On Mon, 10 Apr 2017, alexander.levin@verizon.com wrote:
> On Wed, Mar 22, 2017 at 11:35:58AM +0100, Peter Zijlstra wrote:
> > By changing futex_lock_pi() to use rt_mutex_*_proxy_lock() we arrive
> > at a point where all wait_list modifications are done under both
> > hb->lock and wait_lock.
> [...]
>
> Hey Peter,
>
> I'm seeing the following, which seems to be related to this patch:
>
> [ 21.762875] ODEBUG: free active (active state 0) object type: hrtimer hint: hrtimer_wakeup (kernel/time/hrtimer.c:1423)
> [ 21.788050] debug_object_free (lib/debugobjects.c:603)
> [ 21.791105] destroy_hrtimer_on_stack (kernel/time/hrtimer.c:427)
> [ 21.791746] futex_lock_pi (kernel/futex.c:2740)
> [ 21.800721] do_futex (kernel/futex.c:3399)
> [ 21.818395] SyS_futex (kernel/futex.c:3447 kernel/futex.c:3415)
> [ 21.822260] do_syscall_64 (arch/x86/entry/common.c:284)
> [ 21.827328] entry_SYSCALL64_slow_path (arch/x86/entry/entry_64.S:249)
Yep, that rework dropped the hrtimer cancel. Fix below.
Thanks,
tglx
8<------------------------
diff --git a/kernel/futex.c b/kernel/futex.c
index c3eebcdac206..7ac167683c9f 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -2736,8 +2736,10 @@ static int futex_lock_pi(u32 __user *uaddr, unsigned int flags,
out_put_key:
put_futex_key(&q.key);
out:
- if (to)
+ if (to) {
+ hrtimer_cancel(&to->timer);
destroy_hrtimer_on_stack(&to->timer);
+ }
return ret != -EINTR ? ret : -ERESTARTNOINTR;
uaddr_faulted:
next prev parent reply other threads:[~2017-04-10 16:03 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-22 10:35 [PATCH -v6 00/13] The arduous story of FUTEX_UNLOCK_PI Peter Zijlstra
2017-03-22 10:35 ` [PATCH -v6 01/13] futex: Cleanup variable names for futex_top_waiter() Peter Zijlstra
2017-03-23 18:19 ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-03-24 21:11 ` [PATCH -v6 01/13] " Darren Hart
2017-03-22 10:35 ` [PATCH -v6 02/13] futex: Use smp_store_release() in mark_wake_futex() Peter Zijlstra
2017-03-23 18:19 ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-03-24 21:16 ` [PATCH -v6 02/13] " Darren Hart
2017-03-22 10:35 ` [PATCH -v6 03/13] futex: Remove rt_mutex_deadlock_account_*() Peter Zijlstra
2017-03-23 18:20 ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-03-24 21:29 ` [PATCH -v6 03/13] " Darren Hart
2017-03-24 21:31 ` Darren Hart
2017-03-22 10:35 ` [PATCH -v6 04/13] futex,rt_mutex: Provide futex specific rt_mutex API Peter Zijlstra
2017-03-23 18:20 ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-03-25 0:37 ` [PATCH -v6 04/13] " Darren Hart
2017-04-06 12:15 ` Peter Zijlstra
2017-04-06 17:02 ` Darren Hart
2017-04-05 15:02 ` Darren Hart
2017-04-06 12:17 ` Peter Zijlstra
2017-04-06 17:08 ` Darren Hart
2017-03-22 10:35 ` [PATCH -v6 05/13] futex: Change locking rules Peter Zijlstra
2017-03-23 18:21 ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-04-05 21:18 ` [PATCH -v6 05/13] " Darren Hart
2017-04-06 12:28 ` Peter Zijlstra
2017-04-06 15:58 ` Joe Perches
2017-04-06 17:21 ` Darren Hart
2017-03-22 10:35 ` [PATCH -v6 06/13] futex: Cleanup refcounting Peter Zijlstra
2017-03-23 18:21 ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-04-05 21:29 ` [PATCH -v6 06/13] " Darren Hart
2017-03-22 10:35 ` [PATCH -v6 07/13] futex: Rework inconsistent rt_mutex/futex_q state Peter Zijlstra
2017-03-23 18:22 ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-04-05 21:58 ` [PATCH -v6 07/13] " Darren Hart
2017-03-22 10:35 ` [PATCH -v6 08/13] futex: Pull rt_mutex_futex_unlock() out from under hb->lock Peter Zijlstra
2017-03-23 18:22 ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-04-05 23:52 ` [PATCH -v6 08/13] " Darren Hart
2017-04-06 12:42 ` Peter Zijlstra
2017-04-06 17:42 ` Darren Hart
2017-03-22 10:35 ` [PATCH -v6 09/13] futex,rt_mutex: Introduce rt_mutex_init_waiter() Peter Zijlstra
2017-03-23 18:23 ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-04-05 23:57 ` [PATCH -v6 09/13] " Darren Hart
2017-03-22 10:35 ` [PATCH -v6 10/13] futex,rt_mutex: Restructure rt_mutex_finish_proxy_lock() Peter Zijlstra
2017-03-23 18:23 ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-04-07 23:30 ` [PATCH -v6 10/13] " Darren Hart
2017-04-07 23:35 ` Darren Hart
2017-03-22 10:35 ` [PATCH -v6 11/13] futex: Rework futex_lock_pi() to use rt_mutex_*_proxy_lock() Peter Zijlstra
2017-03-23 18:24 ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-04-08 0:55 ` [PATCH -v6 11/13] " Darren Hart
2017-04-10 15:51 ` alexander.levin
2017-04-10 16:03 ` Thomas Gleixner [this message]
2017-04-14 9:30 ` [tip:locking/core] futex: Avoid freeing an active timer tip-bot for Thomas Gleixner
2017-03-22 10:35 ` [PATCH -v6 12/13] futex: futex_unlock_pi() determinism Peter Zijlstra
2017-03-23 18:24 ` [tip:locking/core] futex: Futex_unlock_pi() determinism tip-bot for Peter Zijlstra
2017-04-08 1:27 ` [PATCH -v6 12/13] futex: futex_unlock_pi() determinism Darren Hart
2017-03-22 10:36 ` [PATCH -v6 13/13] futex: futex_lock_pi() vs PREEMPT_RT_FULL Peter Zijlstra
2017-03-23 18:25 ` [tip:locking/core] futex: Drop hb->lock before enqueueing on the rtmutex tip-bot for Peter Zijlstra
2017-04-08 2:26 ` [PATCH -v6 13/13] futex: futex_lock_pi() vs PREEMPT_RT_FULL Darren Hart
2017-04-08 5:22 ` Mike Galbraith
2017-04-10 8:43 ` Sebastian Andrzej Siewior
2017-04-10 9:08 ` Peter Zijlstra
2017-04-10 16:05 ` Darren Hart
2017-03-24 1:45 ` [PATCH -v6 00/13] The arduous story of FUTEX_UNLOCK_PI Darren Hart
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