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From: Fengguang Wu <fengguang.wu@intel.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
	Ingo Molnar <mingo@kernel.org>, Jet Chen <jet.chen@intel.com>,
	Su Tao <tao.su@intel.com>, Yuanhan Liu <yuanhan.liu@intel.com>,
	LKP <lkp@01.org>,
	linux-kernel@vger.kernel.org
Subject: Re: [hw_breakpoint] WARNING: at kernel/trace/trace_kprobe.c:1393 kprobe_trace_self_tests_init()
Date: Wed, 1 Oct 2014 14:57:57 +0800	[thread overview]
Message-ID: <20141001065757.GA17297@wfg-t540p.sh.intel.com> (raw)
In-Reply-To: <20140930175844.GA20922@redhat.com>

Hi Oleg,

> > +-----------------------------------------------------------------------+------------+------------+------------------+
> > |                                                                       | 003002e04e | 8b4d801b2b | v3.17-rc7_093000 |
> > +-----------------------------------------------------------------------+------------+------------+------------------+
> > | boot_successes                                                        | 60         | 0          | 0                |
> > | boot_failures                                                         | 0          | 20         | 11               |
> > | WARNING:at_kernel/trace/trace_kprobe.c:kprobe_trace_self_tests_init() | 0          | 20         | 11               |
> > | backtrace:kprobe_trace_self_tests_init                                | 0          | 20         | 11               |
> > | backtrace:warn_slowpath_null                                          | 0          | 20         | 11               |
> > | backtrace:kernel_init_freeable                                        | 0          | 20         | 11               |
> > +-----------------------------------------------------------------------+------------+------------+------------------+
> >
> > [    4.188679] Testing kprobe tracing:
> > [    4.189810] Could not insert probe at kprobe_trace_selftest_target+0: -22
> 
> __register_trace_kprobe() fails.
> 
> No, I am very sure this can't be caused by the commit above. If nothing else,
> task_bp_pinned() changed by this commit is not even called in this case.

Sorry it is a bad bisect -- debug shows that CONFIG_FTRACE_STARTUP_TEST
is not enabled at all in the parent commit, which makes it boot success.
I'll fix this issue in my script and make the bisect stable.

Thanks,
Fengguang

      parent reply	other threads:[~2014-10-01  6:58 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-30  7:43 Fengguang Wu
2014-09-30 17:58 ` Oleg Nesterov
2014-10-01  2:18   ` Masami Hiramatsu
2014-10-01  6:57   ` Fengguang Wu [this message]

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