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SubjectRe: [PATCH 0/5 v2] [GIT PULL] x86/jump label: Paranoid checks and 2 or 5 byte nops
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On Mon, 2012-01-30 at 15:48 +0100, Ingo Molnar wrote:
> * Steven Rostedt <rostedt@goodmis.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?

Could you post the exact line of that address?

<ffffffff8101546d>

I know there was some work to default enable some code. I'm not sure how
much made it in. I'm thinking the line you triggered was:
/*
* The location is not a nop that we were expecting,
* something went wrong. Crash the box, as something could be
* corrupting the kernel.
*/
BUG();


It hits this if we enable a nop that is not what we expect it to be.

Yeah, send me the config too, and I'll run this against tip/master with
all the patches applied.

Thanks!

-- Steve




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