linux-kernel - Re: Ask help about pre_init_apic

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 12 Sep 2014 10:26:26 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	x86@...nel.org
Subject: Re: Ask help about pre_init_apic_IRQ0()

On Fri, 12 Sep 2014, Andy Shevchenko wrote:
> On Thu, 2014-09-11 at 23:59 +0200, Thomas Gleixner wrote:

> > > >      x86_intel_mid_timer=apbt_only
> 
> w/o patch
> 
> [    0.000000] Early APIC setup for system timer0
> [    0.000000] ------------[ cut here ]------------
> [    0.000000] WARNING: CPU: 0 PID: 0 at
> arch/x86/kernel/apic/apic.c:1393 setup_local_APIC+0x20c/0x2d9()
> 
> ...and stuck a bit later

Right, because there is no apbt timer in that machine and the
commandline tells the kernel to use it and ignore the local apic
timer.
 
> > > > or
> > > >      x86_intel_mid_timer=lapic_and_apbt
> > > 
> > > [    0.116858] BUG: unable to handle kernel NULL pointer dereference at
> > > 0000003a
> > > [    0.123820] IP: [<c1071c0e>] setup_irq+0xf/0x4d
> > > ...
> > > 
> 
> w/o patch
> 
> [    0.000000] Early APIC setup for system timer0
> [    0.000000] ------------[ cut here ]------------
> [    0.000000] WARNING: CPU: 0 PID: 0 at
> arch/x86/kernel/apic/apic.c:1393 setup_local_APIC+0x20c/0x2d9()
> 
> ...and boots normally

Right, because it uses the local apic timer later on.
 
Thanks for providing the data! I'll queue a removal of this mess.

Thanks,

	tglx
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/