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From: Frederic Weisbecker <frederic@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Paul E . McKenney" <paulmck@kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Russell King <rmk+kernel@armlinux.org.uk>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Joel Fernandes <joel@joelfernandes.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Will Deacon <will@kernel.org>, Ingo Molnar <mingo@kernel.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 6/9] lockdep: Introduce wait-type checks
Date: Tue, 31 Mar 2020 17:37:35 +0200	[thread overview]
Message-ID: <20200331153734.GA6979@lenoir> (raw)
In-Reply-To: <20200331152850.GI20760@hirez.programming.kicks-ass.net>

On Tue, Mar 31, 2020 at 05:28:50PM +0200, Peter Zijlstra wrote:
> On Tue, Mar 31, 2020 at 04:55:15PM +0200, Peter Zijlstra wrote:
> > On Tue, Mar 31, 2020 at 03:25:21PM +0200, Geert Uytterhoeven wrote:
> > > On arm64 (e.g. R-Car H3 ES2.0):
> > > 
> > > +=============================
> > > +[ BUG: Invalid wait context ]
> > > +5.6.0-salvator-x-09423-gb29514ba13a9c459-dirty #679 Not tainted
> > > +-----------------------------
> > > +swapper/5/0 is trying to lock:
> > > +ffffff86ff76f398 (&pool->lock){..-.}-{3:3}, at: __queue_work+0x134/0x430
> > > +other info that might help us debug this:
> > > +1 lock held by swapper/5/0:
> > > + #0: ffffffc01103a4a0 (rcu_read_lock){....}-{1:3}, at:
> > > rcu_lock_acquire.constprop.59+0x0/0x38
> > > +stack backtrace:
> > > +CPU: 5 PID: 0 Comm: swapper/5 Not tainted
> > > 5.6.0-salvator-x-09423-gb29514ba13a9c459-dirty #679
> > > +Hardware name: Renesas Salvator-X 2nd version board based on r8a77951 (DT)
> > > +Call trace:
> > > + dump_backtrace+0x0/0x180
> > > + show_stack+0x14/0x1c
> > > + dump_stack+0xdc/0x12c
> > > + __lock_acquire+0x37c/0xf9c
> > > + lock_acquire+0x258/0x288
> > > + _raw_spin_lock+0x34/0x48
> > > + __queue_work+0x134/0x430
> > > + queue_work_on+0x48/0x8c
> > > + timers_update_nohz+0x24/0x2c
> > > + tick_nohz_activate.isra.15.part.16+0x5c/0x80
> > > + tick_setup_sched_timer+0xe0/0xf0
> > > + hrtimer_run_queues+0x88/0xf8
> > 
> > So this is complaining that it cannot take pool->lock, which is
> > WAIT_CONFIG while holding RCU, which presents a WAIT_CONFIG context.
> > 
> > This seems to implicate something is amiss, because that should be
> > allowed. The thing it doesn't print is the context, which in the above
> > case is a (hrtimer) interrupt.
> > 
> > I suspect this really is a hardirq context and the next patch won't cure
> > things. It looks nohz (full?) related.
> > 
> > Frederic, can you untangle this?
> 
> Sebastian is right; I completely forgot the workqueue thing was still
> pending.
> 

Ok good, because I had no better answer :)

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WARNING: multiple messages have this Message-ID (diff)
From: Frederic Weisbecker <frederic@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>, Will Deacon <will@kernel.org>,
	"Paul E . McKenney" <paulmck@kernel.org>,
	Joel Fernandes <joel@joelfernandes.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Russell King <rmk+kernel@armlinux.org.uk>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Frederic Weisbecker <fweisbec@gmail.com>
Subject: Re: [PATCH 6/9] lockdep: Introduce wait-type checks
Date: Tue, 31 Mar 2020 17:37:35 +0200	[thread overview]
Message-ID: <20200331153734.GA6979@lenoir> (raw)
In-Reply-To: <20200331152850.GI20760@hirez.programming.kicks-ass.net>

On Tue, Mar 31, 2020 at 05:28:50PM +0200, Peter Zijlstra wrote:
> On Tue, Mar 31, 2020 at 04:55:15PM +0200, Peter Zijlstra wrote:
> > On Tue, Mar 31, 2020 at 03:25:21PM +0200, Geert Uytterhoeven wrote:
> > > On arm64 (e.g. R-Car H3 ES2.0):
> > > 
> > > +=============================
> > > +[ BUG: Invalid wait context ]
> > > +5.6.0-salvator-x-09423-gb29514ba13a9c459-dirty #679 Not tainted
> > > +-----------------------------
> > > +swapper/5/0 is trying to lock:
> > > +ffffff86ff76f398 (&pool->lock){..-.}-{3:3}, at: __queue_work+0x134/0x430
> > > +other info that might help us debug this:
> > > +1 lock held by swapper/5/0:
> > > + #0: ffffffc01103a4a0 (rcu_read_lock){....}-{1:3}, at:
> > > rcu_lock_acquire.constprop.59+0x0/0x38
> > > +stack backtrace:
> > > +CPU: 5 PID: 0 Comm: swapper/5 Not tainted
> > > 5.6.0-salvator-x-09423-gb29514ba13a9c459-dirty #679
> > > +Hardware name: Renesas Salvator-X 2nd version board based on r8a77951 (DT)
> > > +Call trace:
> > > + dump_backtrace+0x0/0x180
> > > + show_stack+0x14/0x1c
> > > + dump_stack+0xdc/0x12c
> > > + __lock_acquire+0x37c/0xf9c
> > > + lock_acquire+0x258/0x288
> > > + _raw_spin_lock+0x34/0x48
> > > + __queue_work+0x134/0x430
> > > + queue_work_on+0x48/0x8c
> > > + timers_update_nohz+0x24/0x2c
> > > + tick_nohz_activate.isra.15.part.16+0x5c/0x80
> > > + tick_setup_sched_timer+0xe0/0xf0
> > > + hrtimer_run_queues+0x88/0xf8
> > 
> > So this is complaining that it cannot take pool->lock, which is
> > WAIT_CONFIG while holding RCU, which presents a WAIT_CONFIG context.
> > 
> > This seems to implicate something is amiss, because that should be
> > allowed. The thing it doesn't print is the context, which in the above
> > case is a (hrtimer) interrupt.
> > 
> > I suspect this really is a hardirq context and the next patch won't cure
> > things. It looks nohz (full?) related.
> > 
> > Frederic, can you untangle this?
> 
> Sebastian is right; I completely forgot the workqueue thing was still
> pending.
> 

Ok good, because I had no better answer :)

  reply	other threads:[~2020-03-31 15:38 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-13 17:46 [PATCH 0/9] Lock ordering documentation and annotation for lockdep Sebastian Andrzej Siewior
2020-03-13 17:46 ` [PATCH 1/9] Documentation: Add lock ordering and nesting documentation Sebastian Andrzej Siewior
2020-03-14 22:57   ` Randy Dunlap
2020-03-16 10:34     ` Sebastian Andrzej Siewior
2020-03-16 15:13       ` Randy Dunlap
2020-03-13 17:46 ` [PATCH 2/9] timekeeping: Split jiffies seqlock Sebastian Andrzej Siewior
2020-03-13 17:46 ` [PATCH 3/9] pci/switchtec: Don't abuse completion wait queue for poll Sebastian Andrzej Siewior
2020-03-13 18:11   ` Logan Gunthorpe
2020-03-14  0:23     ` Thomas Gleixner
2020-03-14  6:01       ` Logan Gunthorpe
2020-03-16 18:52         ` Thomas Gleixner
2020-03-16 19:24           ` Logan Gunthorpe
2020-03-16 19:34     ` Thomas Gleixner
2020-03-16 21:53       ` Logan Gunthorpe
2020-03-17  0:17         ` Thomas Gleixner
2020-03-17  1:15           ` Logan Gunthorpe
2020-03-13 19:31   ` Peter Zijlstra
2020-03-13 17:46 ` [PATCH 4/9] sched/swait: Prepare usage in completions Sebastian Andrzej Siewior
2020-03-14  0:26   ` Thomas Gleixner
2020-03-13 17:46 ` [PATCH 5/9] completion: Use simple wait queues Sebastian Andrzej Siewior
2020-03-14 15:40   ` Linus Torvalds
2020-03-16 18:55     ` Thomas Gleixner
2020-03-13 17:46 ` [PATCH 6/9] lockdep: Introduce wait-type checks Sebastian Andrzej Siewior
2020-03-31 13:25   ` Geert Uytterhoeven
2020-03-31 13:25     ` Geert Uytterhoeven
2020-03-31 13:42     ` Sebastian Andrzej Siewior
2020-03-31 13:42       ` Sebastian Andrzej Siewior
2020-03-31 14:55     ` Peter Zijlstra
2020-03-31 14:55       ` Peter Zijlstra
2020-03-31 15:28       ` Peter Zijlstra
2020-03-31 15:28         ` Peter Zijlstra
2020-03-31 15:37         ` Frederic Weisbecker [this message]
2020-03-31 15:37           ` Frederic Weisbecker
2025-11-17 13:42   ` Sverdlin, Alexander
2025-11-17 13:55     ` bigeasy
2025-11-17 14:23       ` Sverdlin, Alexander
2025-11-17 14:37         ` Paul E. McKenney
2025-11-17 14:59           ` Sverdlin, Alexander
2025-11-17 15:13             ` bigeasy
2025-11-17 15:28               ` Sverdlin, Alexander
2020-03-13 17:46 ` [PATCH 7/9] lockdep: Add hrtimer context tracing bits Sebastian Andrzej Siewior
2020-03-13 17:47 ` [PATCH 8/9] lockdep: Annotate irq_work Sebastian Andrzej Siewior
2020-03-13 17:47 ` [PATCH 9/9] lockdep: Add posixtimer context tracing bits Sebastian Andrzej Siewior

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