linux-kernel - Re: Linux-2.6.21-rc3 : Dynticks and High resolution Timer hanging the system

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-Id: <1173297130.24738.714.camel@localhost.localdomain>
Date:	Wed, 07 Mar 2007 20:52:10 +0100
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Stephane Casset <sept@...idee.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Linux-2.6.21-rc3 : Dynticks and High resolution Timer hanging
	the system

On Wed, 2007-03-07 at 20:12 +0100, Stephane Casset wrote:
> I also tried compiling the kernel without Tickless and without  High
> resolution timer, this kernel is working ok and is one of the first
> kernel to suspend and resume from RAM. Congratulations ! ;p
>
> I tried to compile te kernel with only Tickless System or  High
> Resolution timer, both hang on boot.

There should be no difference between compile time and runtime
disabling.

> The hang is just after :
> ACPI: PCI Interrupt 0000:00:1f.1[A] -> GSI 18 (level, low) -> IRQ 18
> ICH5: chipset revision 2
> ICH5: not 100% native mode: will probe irqs later
>     ide0: BM-DMA at 0x2040-0x2047, BIOS settings: hda:DMA, hdb:pio
>     ide1: BM-DMA at 0x2048-0x204f, BIOS settings: hdc:DMA, hdd:pio
> 
> And I have the message :
> Switched to NOHZ mode on CPU #1
> or
> Switched to high resolution mode on CPU #1
> Depending on the option enabled/disabled 
> 
> What can I do to help find the bug ?

Can you capture a boot log with highres and/or dynticks enabled ? 

Enable CONFIG_SERIAL_8250_CONSOLE and add "console=ttyS0,115200" to the
commandline. Capture the output with minicom on a second box.

Also please enable CONFIG_MAGIC_SYSRQ and try to send a SysRq-T and a
SysRq-Q to the machine via keyboard or the serial line.

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/