linux-kernel - Re: [PATCH 0/5 v2] [GIT PULL] x86/jump label: Paranoid checks and 2 or 5 byte nops

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Date:	Mon, 30 Jan 2012 15:48:57 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jason Baron <jbaron@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 0/5 v2] [GIT PULL] x86/jump label: Paranoid checks and 2
 or 5 byte nops


* Steven Rostedt <rostedt@...dmis.org> wrote:

> 
> Ingo,
> 
> This is the second round with the suggestions made by Peter 
> and Andrew incorporated (and tested).

they are crashing my testbox:

Policy zone: DMA32
Kernel command line: root=/dev/sda6 earlyprintk=ttyS0,115200 
console=ttyS0,115200 debug initcall_de
bug sysrq_always_enabled ignore_loglevel selinux=0 
nmi_watchdog=1 panic=1 3
sysrq: sysrq always enabled.
PANIC: early exception 06 rip 10:ffffffff8101546d error 0 cr2 
f06f53
Pid: 0, comm: swapper Not tainted 
3.3.0-rc1-tip-02083-ga5066f8-dirty #170372
Call Trace:
 [<ffffffff8101546d>] ? __jump_label_transform+0x81/0x14e
 [<ffffffff81063ee4>] ? try_to_wake_up+0x1f8/0x2cc
 [<ffffffff8184d19e>] early_idt_handler+0x5e/0x71
 [<ffffffff8101546d>] ? __jump_label_transform+0x81/0x14e
 [<ffffffff81015457>] ? __jump_label_transform+0x6b/0x14e
 [<ffffffff810155f8>] arch_jump_label_transform_static+0x6f/0x77
 [<ffffffff81865162>] jump_label_init+0x68/0x98
 [<ffffffff8184d98b>] start_kernel+0x182/0x3b8
 [<ffffffff8184d2c3>] x86_64_start_reservations+0xae/0xb2
 [<ffffffff8184d40d>] x86_64_start_kernel+0x146/0x153
RIP __jump_label_transform+0x81/0x14e

Do you need the config or is the bug obvious at first sight?

Thanks,

	Ingo
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