From: Steven Rostedt <rostedt@goodmis.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-kernel@vger.kernel.org,
linux-rt-users <linux-rt-users@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Carsten Emde <C.Emde@osadl.org>, John Kacur <jkacur@redhat.com>,
Paul Gortmaker <paul.gortmaker@windriver.com>
Subject: Re: [PATCH RT 00/39] Linux 3.14.34-rt32-rc1
Date: Mon, 16 Mar 2015 10:02:05 -0400 [thread overview]
Message-ID: <20150316100205.261c039e@gandalf.local.home> (raw)
In-Reply-To: <20150316135910.GA28130@linutronix.de>
On Mon, 16 Mar 2015 14:59:10 +0100
Sebastian Andrzej Siewior <bigeasy@linutronix.de> wrote:
> * Steven Rostedt | 2015-03-12 15:13:07 [-0400]:
>
> >Please scream at me if I messed something up. Please test the patches too.
>
> So Paul remided us about the dead lock thingy that has been reported.
> Users reported that it does not occur with v3.18-RT and they think it is
> due to 'Revert "timers: do not raise softirq unconditionally"' in
> Revert-timers-do-not-raise-softirq-unconditionally.patch.
>
> I reverted it because I couldn't get highres to get to work at all on
> v3.18 due to different synchronisation / expectaion of the timer
> framework. Since the trylock might record a different lock owner it is
> possible that this causes the deadlock (it thinks). Therefore it has no
> stable tag nor any reference to the deadlock problem.
I guess the question is, is there any other place that does a trylock
in hard irq context? If so, the revert isn't going to fix it.
-- Steve
>
> With this patch applied FULL_NOHZ should not properly work (again) due
> to timer softirq wake ups (but this is a different problem).
>
> Sebastian
next prev parent reply other threads:[~2015-03-16 14:02 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-12 19:13 [PATCH RT 00/39] Linux 3.14.34-rt32-rc1 Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 01/39] gpio: omap: use raw locks for locking Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 02/39] rtmutex: Simplify rtmutex_slowtrylock() Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 03/39] rtmutex: Simplify and document try_to_take_rtmutex() Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 04/39] rtmutex: No need to keep task ref for lock owner check Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 05/39] rtmutex: Clarify the boost/deboost part Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 06/39] rtmutex: Document pi chain walk Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 07/39] rtmutex: Simplify remove_waiter() Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 08/39] rtmutex: Confine deadlock logic to futex Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 09/39] rtmutex: Cleanup deadlock detector debug logic Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 10/39] rtmutex: Avoid pointless requeueing in the deadlock detection chain walk Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 11/39] futex: Make unlock_pi more robust Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 12/39] futex: Use futex_top_waiter() in lookup_pi_state() Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 13/39] futex: Split out the waiter check from lookup_pi_state() Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 14/39] futex: Split out the first waiter attachment " Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 15/39] futex: Simplify futex_lock_pi_atomic() and make it more robust Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 16/39] locking/rt-mutex: avoid a NULL pointer dereference on deadlock Steven Rostedt
2015-03-13 10:40 ` Sebastian Andrzej Siewior
2015-03-13 10:56 ` Sebastian Andrzej Siewior
2015-03-12 19:13 ` [PATCH RT 17/39] rtmutex.c: Fix incorrect waiter check Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 18/39] rt,locking: fix __ww_mutex_lock_interruptible() lockdep annotation Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 19/39] rtmutex: enable deadlock detection in ww_mutex_lock functions Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 20/39] x86: UV: raw_spinlock conversion Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 22/39] arm/futex: disable preemption during futex_atomic_cmpxchg_inatomic() Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 23/39] ARM: cmpxchg: define __HAVE_ARCH_CMPXCHG for armv6 and later Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 24/39] mips: rt: Replace pagefault_* to raw version Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 25/39] sas-ata/isci: dontt disable interrupts in qc_issue handler Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 26/39] scheduling while atomic in cgroup code Steven Rostedt
2015-03-17 20:10 ` Paul Gortmaker
2015-03-17 20:13 ` Steven Rostedt
2015-03-18 8:37 ` Sebastian Andrzej Siewior
2015-03-18 13:20 ` Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 27/39] work-simple: Simple work queue implemenation Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 28/39] sunrpc: make svc_xprt_do_enqueue() use get_cpu_light() Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 29/39] Revert "rwsem-rt: Do not allow readers to nest" Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 30/39] locking: ww_mutex: fix ww_mutex vs self-deadlock Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 31/39] thermal: Defer thermal wakups to threads Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 32/39] lockdep: selftest: fix warnings due to missing PREEMPT_RT conditionals Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 33/39] fs/aio: simple simple work Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 34/39] timers: Track total number of timers in list Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 35/39] timers: Reduce __run_timers() latency for empty list Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 36/39] timers: Reduce future __run_timers() latency for newly emptied list Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 37/39] timers: Reduce future __run_timers() latency for first add to empty list Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 38/39] staging: Mark rtl8821ae as broken Steven Rostedt
2015-03-12 19:13 ` [PATCH RT 39/39] Linux 3.14.34-rt32-rc1 Steven Rostedt
2015-03-13 4:49 ` [PATCH RT 00/39] " Mike Galbraith
2015-03-13 13:50 ` Steven Rostedt
2015-03-13 15:11 ` Steven Rostedt
2015-03-13 15:24 ` Steven Rostedt
2015-03-13 11:01 ` Sebastian Andrzej Siewior
2015-03-13 11:33 ` Sebastian Andrzej Siewior
2015-03-16 13:59 ` Sebastian Andrzej Siewior
2015-03-16 14:02 ` Steven Rostedt [this message]
2015-03-16 14:10 ` Sebastian Andrzej Siewior
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