From: Peter Zijlstra <peterz@infradead.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [LOCKDEP SPLAT 4.14-rc1] Conflict between smpboot thread create completions and get_online_cpus
Date: Thu, 21 Sep 2017 13:04:29 +0200 [thread overview]
Message-ID: <20170921110429.2qx7jn32f6nqnuwf@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20170918152459.35c233d2@gandalf.local.home>
On Mon, Sep 18, 2017 at 03:24:59PM -0400, Steven Rostedt wrote:
> And adding some debugging where the lockdep splat happened:
>
> watchdog-27 3.... 764857us : cpus_read_lock+0x5/0xc0: lock cpu
> watchdog-27 3.... 764858us : <stack trace>
> => x86_release_hardware+0x8f/0xa0
> => hw_perf_event_destroy+0xe/0x20
> => _free_event+0xca/0x3d0
> => put_event+0x14/0x20
> => perf_event_release_kernel+0x236/0x330
> => watchdog_nmi_disable+0x49/0x70
> => watchdog_disable+0x4d/0x60
> => smpboot_thread_fn+0x138/0x280
> => kthread+0x152/0x190
> => ret_from_fork+0x2a/0x40
> watchdog-27 3.... 764917us : cpus_read_unlock+0x5/0xa0: unlock cpu
> watchdog-27 3d..1 764918us : lock_commit_crosslock+0xc1/0x5b0: xhlock=132
Yeah, known issue. Thomas has already been prodding at the watchdog
stuff.
prev parent reply other threads:[~2017-09-21 11:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-18 19:24 Steven Rostedt
2017-09-21 11:04 ` Peter Zijlstra [this message]
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