linux-kernel - Re: [tip:x86/debug] x86, NMI: Add NMI IPI selftest

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Date:	Tue, 6 Dec 2011 21:01:08 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Don Zickus <dzickus@...hat.com>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	andi@...stfloor.org, torvalds@...ux-foundation.org,
	peterz@...radead.org, robert.richter@....com, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/debug] x86, NMI: Add NMI IPI selftest


* Don Zickus <dzickus@...hat.com> wrote:

> On Tue, Dec 06, 2011 at 10:06:12AM +0100, Ingo Molnar wrote:
> > 
> > * tip-bot for Don Zickus <dzickus@...hat.com> wrote:
> > 
> > > Commit-ID:  99e8b9ca90d688c3ac7d3a141b701c9694a93925
> > > Gitweb:     http://git.kernel.org/tip/99e8b9ca90d688c3ac7d3a141b701c9694a93925
> > > Author:     Don Zickus <dzickus@...hat.com>
> > > AuthorDate: Thu, 13 Oct 2011 15:14:26 -0400
> > > Committer:  Ingo Molnar <mingo@...e.hu>
> > > CommitDate: Mon, 5 Dec 2011 12:00:16 +0100
> > > 
> > > x86, NMI: Add NMI IPI selftest
> > 
> > The NMI test-suite has caught some badness:
> > 
> > [    0.179992] calling  tracer_alloc_buffers+0x0/0x224 @ 1
> > [    0.183417] initcall tracer_alloc_buffers+0x0/0x224 returned 0 after 0 usecs
> > [    0.186658] calling  init_trace_printk+0x0/0xf @ 1
> > [    0.189992] initcall init_trace_printk+0x0/0xf returned 0 after 0 usecs
> > [    0.193324] Brought up 1 CPUs
> > [    0.196657] ----------------
> > [    0.199989] | NMI testsuite:
> > [    0.203322] --------------------
> > [    0.206655]   remote IPI:
> > [    0.209991] ------------[ cut here ]------------
> > [    0.213325] WARNING: at arch/x86/kernel/apic/ipi.c:109 default_send_IPI_mask_logical+0xdb/0x120()
> > [    0.216655] Hardware name: System Product Name
> > [    0.219987] empty IPI mask
> > [    0.223321] Modules linked in:
> > [    0.227015] Pid: 1, comm: swapper/0 Tainted: G        W    3.2.0-rc4-tip+ #163124
> > [    0.229987] Call Trace:
> > [    0.233326]  [<c102e2a2>] warn_slowpath_common+0x72/0xa0
> > [    0.236656]  [<c101e04b>] ? default_send_IPI_mask_logical+0xdb/0x120
> > [    0.239989]  [<c101e04b>] ? default_send_IPI_mask_logical+0xdb/0x120
> > [    0.243321]  [<c102e373>] warn_slowpath_fmt+0x33/0x40
> > [    0.246655]  [<c101e04b>] default_send_IPI_mask_logical+0xdb/0x120
> > [    0.249988]  [<c1024025>] test_nmi_ipi.constprop.2+0x55/0xb0
> > [    0.253320]  [<c10240c8>] remote_ipi+0x48/0x80
> > [    0.256654]  [<c102417d>] dotest.constprop.3+0xd/0x90
> > [    0.259987]  [<c1024265>] nmi_selftest+0x65/0x120
> > [    0.263320]  [<c14d4e73>] native_smp_cpus_done+0x15/0xff
> > [    0.266653]  [<c14ddf3f>] smp_init+0xdb/0xe2
> > [    0.269988]  [<c14cb7bb>] ? start_kernel+0x386/0x386
> > [    0.273320]  [<c14cb81d>] kernel_init+0x62/0x118
> > [    0.276653]  [<c138bb3e>] kernel_thread_helper+0x6/0x10
> > 
> > That's an empty IPI mask. NOTE the boot parameters i used:
> 
> I'm on paternity leave, [...]

Congrats! :)

> [...] so I hacked this up for now and compiled tested this.  
> On Monday I can dive into this further if the patch below 
> doesn't solve it.

I'll apply this one and will let you know if there are other 
problems (but i think it will solve it).

Thanks,

	Ingo
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