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From: "河合英宏 / KAWAI,HIDEHIRO" <hidehiro.kawai.ez@hitachi.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: "kbuild-all@01.org" <kbuild-all@01.org>,
	"Jonathan Corbet" <corbet@lwn.net>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Ingo Molnar" <mingo@kernel.org>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Vivek Goyal" <vgoyal@redhat.com>, "Baoquan He" <bhe@redhat.com>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	"x86@kernel.org" <x86@kernel.org>,
	"kexec@lists.infradead.org" <kexec@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Michal Hocko" <mhocko@kernel.org>,
	"Ingo Molnar" <mingo@redhat.com>,
	"Borislav Petkov" <bp@alien8.de>,
	"平松雅巳 / HIRAMATU,MASAMI" <masami.hiramatsu.pt@hitachi.com>
Subject: RE: Re: [V6 PATCH 5/6] x86/nmi: Fix to save registers for crash dump on external NMI broadcast
Date: Thu, 10 Dec 2015 06:36:20 +0000	[thread overview]
Message-ID: <04EAB7311EE43145B2D3536183D1A84454A4EA10@GSjpTKYDCembx31.service.hitachi.net> (raw)
In-Reply-To: <201512101102.6UNkKzbX%fengguang.wu@intel.com>

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Hi Steven,

> From: Steven Rostedt [mailto:rostedt@goodmis.org]
> On Tue, Nov 24, 2015 at 11:48:53AM +0100, Borislav Petkov wrote:
> > > +	 */
> > > +	while (!raw_spin_trylock(&nmi_reason_lock))
> > > +		poll_crash_ipi_and_callback(regs);
> >
> > Waaait a minute: so if we're getting NMIs broadcasted on every core but
> > we're *not* crash dumping, we will run into here too. This can't be
> > right. :-\
> 
> This only does something if crash_ipi_done is set, which means you are killing
> the box. But perhaps a comment that states that here would be useful, or maybe
> just put in the check here. There's no need to make it depend on SMP, as
> raw_spin_trylock() will turn to just ({1}) for UP, and that code wont even be
> hit.

It seems that poll_crash_ipi_and_callback (now renamed to run_crash_ipi_callback)
is referred for UP if CONFIG_DEBUG_SPINLOCK=y, and it causes a build error
as below.  run_crash_ipi_callback refers crash_ipi_issued and crash_nmi_callback,
which are defined only if CONFIG_SMP=y.  So we need to defined it separately
for SMP and UP.

I'll resend this patch later.

> Hi Hidehiro,
> 
> [auto build test ERROR on v4.4-rc4]
> [also build test ERROR on next-20151209]
> [cannot apply to tip/x86/core]
> 
> url:
> https://github.com/0day-ci/linux/commits/Hidehiro-Kawai/Fix-race-issues-among-panic-NMI-and-crash_kexec/20151210-095
> 254
> config: x86_64-randconfig-s4-12101030 (attached as .config)
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=x86_64
> 
> All errors (new ones prefixed by >>):
> 
>    arch/x86/built-in.o: In function `do_nmi':
> >> (.text+0x7339): undefined reference to `run_crash_ipi_callback'
> 
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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  reply	other threads:[~2015-12-10  6:36 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-10  1:46 [V6 PATCH 0/6] Fix race issues among panic, NMI and crash_kexec Hidehiro Kawai
2015-12-10  1:46 ` [V6 PATCH 1/6] panic/x86: Fix re-entrance problem due to panic on NMI Hidehiro Kawai
2015-12-10 15:41   ` Borislav Petkov
2015-12-11  0:23     ` 河合英宏 / KAWAI,HIDEHIRO
2015-12-19 10:12   ` [tip:x86/apic] panic, x86: " tip-bot for Hidehiro Kawai
2015-12-10  1:46 ` [V6 PATCH 2/6] panic/x86: Allow CPUs to save registers even if they are looping in NMI context Hidehiro Kawai
2015-12-19 10:13   ` [tip:x86/apic] panic, x86: Allow CPUs to save registers even if " tip-bot for Hidehiro Kawai
2015-12-10  1:46 ` [V6 PATCH 3/6] kexec: Fix race between panic() and crash_kexec() called directly Hidehiro Kawai
2015-12-19 10:13   ` [tip:x86/apic] kexec: Fix race between panic() and crash_kexec() tip-bot for Hidehiro Kawai
2015-12-10  1:46 ` [V6 PATCH 4/6] x86/apic: Introduce apic_extnmi boot option Hidehiro Kawai
2015-12-19 10:13   ` [tip:x86/apic] x86/apic: Introduce apic_extnmi command line parameter tip-bot for Hidehiro Kawai
2015-12-10  1:46 ` [V6 PATCH 5/6] x86/nmi: Fix to save registers for crash dump on external NMI broadcast Hidehiro Kawai
2015-12-10  3:57   ` kbuild test robot
2015-12-10  6:36     ` 河合英宏 / KAWAI,HIDEHIRO [this message]
2015-12-10  6:52       ` [V6.1 " Hidehiro Kawai
2015-12-11 18:04         ` Borislav Petkov
2015-12-19 10:14         ` [tip:x86/apic] x86/nmi: Save regs in crash dump on external NMI tip-bot for Hidehiro Kawai
2015-12-10  1:46 ` [V6 PATCH 6/6] Documentation: Add documentation for kernel.panic_on_io_nmi sysctl Hidehiro Kawai
2015-12-19 10:14   ` [tip:x86/apic] Documentation: Document " tip-bot for Hidehiro Kawai
2015-12-12 11:17 ` [V6 PATCH 0/6] Fix race issues among panic, NMI and crash_kexec Borislav Petkov

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