linux-kernel - Re: Was: Re: [GIT PULL] timer changes for v3.6, Is: Regression introduced by 1e75fa8be9fb61e1af46b5b3b176347a4c958ca1

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Date:	Mon, 23 Jul 2012 10:41:49 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	xen-devel@...ts.xensource.com
Subject: Re: Was: Re: [GIT PULL] timer changes for v3.6, Is: Regression introduced
 by 1e75fa8be9fb61e1af46b5b3b176347a4c958ca1

On 07/23/2012 07:49 AM, Konrad Rzeszutek Wilk wrote:
> I hadn't looked in details of the patch, but this commit:
>
> commit 1e75fa8be9fb61e1af46b5b3b176347a4c958ca1
> Author: John Stultz <john.stultz@...aro.org>
> Date:   Fri Jul 13 01:21:53 2012 -0400
>
>      time: Condense timekeeper.xtime into xtime_sec
>
> causes 32-bit (and only 32-bit) bootup time crashes on Xen guests. I couldn't
> do a git revert on top of Linus's tree (had a bunch of conflicts), but with
> git bisection it narrowed down to that patch.
>
> I could also bootup with git commit 55acdddbac1725b80df0c41970505e8a41c84956
> (the smp-hotplug-for-linus merge), but with git commit
> 3992c0321258bdff3666cbaf5225f538ad61a548 (timers-core-for-linus merge aka this pull)
> it went belly up.
>
> This is the guest config:
>
> extra="console=hvc0 debug earlyprintk=xen memblock=debug"
> kernel="/mnt/lab/bootstrap-i386/vmlinuz"
> ramdisk="/mnt/lab/bootstrap-i386/initramfs.cpio.gz"
> mem=10248
> vcpus=1
> name="bootstrap-i386"
> on_crash="preserve"
>
> Attached is the crash log and I am also attaching the .config file and bisect log.
>
> John, any thoughts? Is Xen clock timer (arch/x86/xen/time.c) code missing something obvious?

Thanks for the testing and the report!  I'll take a closer look here and 
see.

> Using config file "/test.xm".
> Started domain bootstrap-i386 (id=4)
> [    0.000000] console [hvc0] enabled, bootconsole disabled
> [    0.000000] Xen: using vcpuop timer interface
> [    0.000000] installing Xen timer for CPU 0
> [    0.000000] ------------[ cut here ]------------
> [    0.000000] WARNING: at /home/konrad/linux/kernel/time/clockevents.c:209 clockevents_program_event+0x176/0x190()
> [    0.000000] Modules linked in:
> [    0.000000] Pid: 0, comm: swapper/0 Not tainted 3.5.0upstream-00242-g3992c03 #1
> [    0.000000] Call Trace:
> [    0.000000]  [<c1067aed>] warn_slowpath_common+0x6d/0xa0
> [    0.000000]  [<c10aa846>] ? clockevents_program_event+0x176/0x190
> [    0.000000]  [<c10aa846>] ? clockevents_program_event+0x176/0x190
> [    0.000000]  [<c1067b3d>] warn_slowpath_null+0x1d/0x20
> [    0.000000]  [<c10aa846>] clockevents_program_event+0x176/0x190
> [    0.000000]  [<c10aaa36>] tick_setup_periodic+0x66/0xa0
> [    0.000000]  [<c10aade7>] tick_notify+0x377/0x3d0
> [    0.000000]  [<c1511043>] notifier_call_chain+0x43/0x60
> [    0.000000]  [<c108985a>] raw_notifier_call_chain+0x1a/0x20
> [    0.000000]  [<c10aa1f8>] clockevents_register_device+0x88/0xf0
> [    0.000000]  [<c102fb12>] xen_setup_cpu_clockevents+0x22/0x40
> [    0.000000]  [<c16bba3a>] xen_time_init+0xb7/0xbf
> [    0.000000]  [<c16bcf1c>] x86_late_time_init+0x9/0x10
> [    0.000000]  [<c16b7a7f>] start_kernel+0x286/0x317
> [    0.000000]  [<c16b766a>] ? kernel_init+0x1cd/0x1cd
> [    0.000000]  [<c16b72e6>] i386_start_kernel+0xa9/0xb0
> [    0.000000]  [<c16ba609>] xen_start_kernel+0x5c9/0x5d1

Is this WARN_ON new, as well as the oops?

thanks
-john


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