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From: Steven Rostedt <rostedt@goodmis.org>
To: Joel Fernandes <joelaf@google.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Tom Zanussi <tom.zanussi@linux.intel.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Boqun Feng <boqun.feng@gmail.com>,
	Paul McKenney <paulmck@linux.vnet.ibm.com>,
	"Cc: Frederic Weisbecker" <fweisbec@gmail.com>,
	Randy Dunlap <rdunlap@infradead.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Fenguang Wu <fengguang.wu@intel.com>,
	Baohong Liu <baohong.liu@intel.com>,
	Vedang Patel <vedang.patel@intel.com>,
	"Cc: Android Kernel" <kernel-team@android.com>
Subject: Re: [PATCH] softirq: reorder trace_softirqs_on to prevent lockdep splat
Date: Mon, 30 Apr 2018 18:00:11 -0400	[thread overview]
Message-ID: <20180430180011.2ded931c@gandalf.local.home> (raw)
In-Reply-To: <CAJWu+ookMimv4rgSyjgzKyd8Cr0MgJHFFj8XftawZ7GRr4vOvg@mail.gmail.com>

On Mon, 30 Apr 2018 17:01:04 +0000
Joel Fernandes <joelaf@google.com> wrote:
Tried 4.17-rc3 and see it too. Could be difference in configs? Also, the
> environment is a Qemu system with single CPU 1GB memory. Attached is the
> config.
> 
> I think when I had multiple CPUs it was harder to trigger it, but can't
> really remember now. There was a time when triggering it was quite
> intermittent.
>

Bah, I didn't have CONFIG_DEBUG_LOCKDEP enabled, and that is what does
the backtrace.

-- Steve

  reply	other threads:[~2018-04-30 22:00 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-27  4:11 Joel Fernandes
2018-04-30 16:38 ` Steven Rostedt
2018-04-30 16:52   ` Joel Fernandes
2018-04-30 17:01     ` Joel Fernandes
2018-04-30 22:00       ` Steven Rostedt [this message]
2018-05-01 13:49 ` Steven Rostedt
2018-06-20 20:05 ` Steven Rostedt
2018-06-20 20:20   ` Joel Fernandes
2018-05-02  1:44 Joel Fernandes
2018-05-07 18:21 ` Steven Rostedt
2018-06-01  4:52   ` Joel Fernandes
2018-06-02 17:14     ` Steven Rostedt

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