linux-kernel - Re: [lkp] [x86/setup] f5f3497cad: BUG: kernel boot crashed

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Message-ID: <20151102162551.GB2331@codeblueprint.co.uk>
Date:	Mon, 2 Nov 2015 16:28:01 +0000
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	kernel test robot <ying.huang@...ux.intel.com>
Cc:	Paolo Bonzini <pbonzini@...hat.com>, lkp@...org,
	LKML <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
	Laszlo Ersek <lersek@...hat.com>
Subject: Re: [lkp] [x86/setup] f5f3497cad: BUG: kernel boot crashed

On Wed, 28 Oct, at 01:41:51PM, kernel test robot wrote:
> FYI, we noticed the below changes on
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> commit f5f3497cad8c8416a74b9aaceb127908755d020a ("x86/setup: Extend low identity map to cover whole kernel range")
> 
> 
> +------------------------------------------------+------------+------------+
> |                                                | 8a53554e12 | f5f3497cad |
> +------------------------------------------------+------------+------------+
> | boot_successes                                 | 19         | 10         |
> | boot_failures                                  | 2          | 9          |
> | IP-Config:Auto-configuration_of_network_failed | 2          | 2          |
> | BUG:kernel_boot_crashed                        | 0          | 7          |
> +------------------------------------------------+------------+------------+
> 
> 
> [    0.053410] smpboot: CPU0: GenuineIntel GenuineIntel QEMU Virtual CPU version 2.4.0QEMU Virtual CPU version 2.4.0 (family: 0x6, model: 0x6 (family: 0x6, model: 0x6, stepping: 0x3)
> , stepping: 0x3)
> [    0.056666] Performance Events: 
> [    0.056666] Performance Events: no PMU driver, software events only.
> no PMU driver, software events only.
> [    0.060520] CPU 1 irqstacks, hard=8a832000 soft=8a834000
> [    0.060520] CPU 1 irqstacks, hard=8a832000 soft=8a834000
> [    0.061605] x86: Booting SMP configuration:
> [    0.061605] x86: Booting SMP configuration:
> [    0.062445] .... node  #0, CPUs:  
> [    0.062445] .... node  #0, CPUs:         #1 #1
> Elapsed time: 10
> BUG: kernel boot crashed

Yikes! Yeah, I can reproduce this. It appears the STARTUP IPI code is
triggering this crash in wakeup_secondary_cpu_via_init().

I'll take a look unless anyone else has any bright ideas?
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