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Message-ID: <20110524011203.GK7428@linux.vnet.ibm.com>
Date: Mon, 23 May 2011 18:12:03 -0700
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: Yinghai Lu <yinghai@...nel.org>
Cc: linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
tglx@...utronix.de, mingo@...e.hu
Subject: Re: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage
based on semi-formal proof"
On Mon, May 23, 2011 at 03:01:24PM -0700, Yinghai Lu wrote:
> On 05/23/2011 02:25 PM, Paul E. McKenney wrote:
> > On Mon, May 23, 2011 at 01:14:22PM -0700, Yinghai Lu wrote:
> >> On 05/21/2011 07:08 AM, Paul E. McKenney wrote:
> >>> On Sat, May 21, 2011 at 06:18:44AM -0700, Paul E. McKenney wrote:
> >>>> On Fri, May 20, 2011 at 05:02:40PM -0700, Yinghai Lu wrote:
> >>>>> On 05/20/2011 04:49 PM, Paul E. McKenney wrote:
> >>>>>> On Fri, May 20, 2011 at 04:16:28PM -0700, Yinghai Lu wrote:
> >>>>> ...
> >>>>>>>
> >>>>>>> the same one i sent out before, but let DEBUG_LOCKING_API_SELFTESTS disabled.
> >>>>>>
> >>>>>> OK, just to make sure I understand... You are compiling exactly the
> >>>>>> same kernel source tree with exactly the same .config, just with two
> >>>>>> different versions of gcc, correct?
> >>>>> yes.
> >>>>>>
> >>>>>> If so, it is quite possible that the slow one is the correct one. :-/
> >>>>> yeah, new version always have problem.
> >>>>>
> >>>>> looks like opensuse11.3 has 4.5.0 and fedora14 has 4.5.1
> >>>>
> >>>> OK, so fedora14 is the fast one (4.5.1) and opensuse11.3 is the slow
> >>>> one (4.5.0), correct?
> >>>
> >>> And does commit c7a3786030 help? This commit (from Peter Zijlstra)
> >>> tidied up RCU kthreads' scheduler interactions. The patch is below,
> >>> though it is probably more convenient to pull it from the rcu/next
> >>> branch of:
> >>>
> >>> git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu.git
> >>>
> >
> > Thank you for testing this!
>
> it's ok. don't want to see our servers have problem with newer kernel.
>
> > This is with the same config that you emailed out on May 12th?
>
> yes.
>
> >
> > In particular, CONFIG_TREE_RCU=y?
> >
> >> [ 337.132517] INFO: task rcun0:8 blocked for more than 120 seconds.
> >> [ 337.133238] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> >> [ 337.160396] rcun0 D 0000000000000000 0 8 2 0x00000000
> >> [ 337.161232] ffff882070d3fe90 0000000000000046 ffff882070d3e000 0000000000004000
> >> [ 337.161291] 00000000001d1f80 ffff882070d3ffd8 00000000001d1f80 ffff882070d3ffd8
> >> [ 337.161348] 0000000000004000 00000000001d1f80 ffff882070d18000 ffff882070d422b0
> >> [ 337.161404] Call Trace:
> >> [ 337.161433] [<ffffffff810afab6>] ? __lock_release+0x166/0x16f
> >> [ 337.161459] [<ffffffff81c1dae1>] ? _raw_spin_unlock_irqrestore+0x3f/0x46
> >> [ 337.161486] [<ffffffff810ce633>] ? rcu_cpu_kthread_should_stop+0x137/0x137
> >> [ 337.161512] [<ffffffff810add8a>] ? trace_hardirqs_on+0xd/0xf
> >> [ 337.161533] [<ffffffff810ce633>] ? rcu_cpu_kthread_should_stop+0x137/0x137
> >> [ 337.161558] [<ffffffff81099e41>] kthread+0x8c/0xa8
> >> [ 337.161584] [<ffffffff81c257d4>] kernel_thread_helper+0x4/0x10
> >> [ 337.161606] [<ffffffff81c1dd80>] ? retint_restore_args+0xe/0xe
> >> [ 337.161627] [<ffffffff81099db5>] ? __init_kthread_worker+0x5b/0x5b
> >> [ 337.161645] [<ffffffff81c257d0>] ? gs_change+0xb/0xb
> >> [ 337.161651] no locks held by rcun0/8.
> >
> > This is quite surprising. The "rcun" kthreads invoke rcu_node_kthread(),
> > which does not call rcu_cpu_kthread_should_stop().
> >
> > But perhaps the stack backtrace got confused.
> >
> > Could you please try the following diagnostic patch to help me work out
> > where the rcun threads are getting stuck?
And this is also strange...
> [ 275.679636] RAMDISK: gzip image found at block 0
> [ 277.504381] rcun ffffffff82440b00 starting wait for work.
> [ 277.504693] rcun ffffffff82440b00 completed wait for work.
> [ 277.504951] rcun ffffffff82440b00 initiating boost.
> [ 277.515920] rcun ffffffff82440b00 completed boost.
> [ 277.516157] rcun ffffffff82440b00 awaking rcuc2.
> [ 277.535818] rcun ffffffff82440b00 awakened rcuc2.
> [ 277.536075] rcun ffffffff82440b00 starting wait for work.
> [ 277.604609] EXT3-fs: barriers not enabled
> [ 277.605278] kjournald starting. Commit interval 5 seconds
> [ 277.605473] EXT3-fs (ram0): warning: maximal mount count reached, running e2fsck is recommended
> [ 277.605493] EXT3-fs (ram0): using internal journal
> [ 277.605505] EXT3-fs (ram0): mounted filesystem with writeback data mode
> [ 277.605555] VFS: Mounted root (ext3 filesystem) on device 1:0.
> [ 277.605600] async_waiting @ 1
> [ 277.605604] async_continuing @ 1 after 0 usec
> [ 277.669722] Freeing unused kernel memory: 2892k freed
> INIT: version 2.86 booting
> System Boot Control: Running /etc/init.d/boot
> Mounting procfs at /proc done
> Mounting sysfs at /sys done
> Mounting debugfs at /sys/kernel/debug done
> Mounting tmpfs at /dev done
> Initializing /dev done
> Mounting devpts at /dev/pts done
> Boot logging started on /dev/ttyS0(/dev/console) at Wed May 25 13:43:55 2011
> FATAL: Could not load /lib/modules/2.6.39-tip-yh-05892-gb7b703b-dirty/modules.dep: No such file or directory
> Setting up the hardware clockmodprobe: FATAL: Could not load /lib/modules/2.6.39-tip-yh-05892-gb7b703b-dirty/modules.dep: No such file or directory
>
> hwclock: With --noadjfile, you must specify either --utc or --localtime
> .[8[ 277.836052] udevd (18674): /proc/18674/oom_adj is deprecated, please use /proc/18674/oom_score_adj instead.
> fa[ 277.845689] udevd version 128 started
> iled
> Disabling IP forwarding done
> done
> Starting udevd: done
> Loading drivers, configuring devices: [ 278.019705] rcun ffffffff82441300 starting wait for work.
> [ 278.020057] rcun ffffffff82441300 completed wait for work.
> [ 278.020314] rcun ffffffff82441300 initiating boost.
> [ 278.035052] rcun ffffffff82441300 completed boost.
> [ 278.035383] rcun ffffffff82441300 awaking rcuc141.
> [ 278.054945] rcun ffffffff82441300 awakened rcuc141.
> [ 278.055197] rcun ffffffff82441300 starting wait for work.
> [ 278.159361] rcun ffffffff82441100 starting wait for work.
> [ 278.159666] rcun ffffffff82441100 completed wait for work.
> [ 278.159949] rcun ffffffff82441100 initiating boost.
> [ 278.174805] rcun ffffffff82441100 completed boost.
> [ 278.175044] rcun ffffffff82441100 awaking rcuc111.
> [ 278.194728] rcun ffffffff82441100 awakened rcuc111.
> [ 278.194987] rcun ffffffff82441100 starting wait for work.
> [ 278.303039] rcun ffffffff82440c00 starting wait for work.
> [ 278.303323] rcun ffffffff82440c00 completed wait for work.
> [ 278.303568] rcun ffffffff82440c00 initiating boost.
> [ 278.314519] rcun ffffffff82440c00 completed boost.
> [ 278.314750] rcun ffffffff82440c00 awaking rcuc31.
> [ 278.334455] rcun ffffffff82440c00 awakened rcuc31.
> [ 278.334687] rcun ffffffff82440c00 starting wait for work.
> [ 278.498822] rcun ffffffff82441400 starting wait for work.
> [ 278.499131] rcun ffffffff82441400 completed wait for work.
> [ 278.499412] rcun ffffffff82441400 initiating boost.
> [ 278.514295] rcun ffffffff82441400 completed boost.
> [ 278.514632] rcun ffffffff82441400 awaking rcuc151.
> [ 278.534082] rcun ffffffff82441400 awakened rcuc151.
> [ 278.534338] rcun ffffffff82441400 starting wait for work.
> [ 278.686359] rcun ffffffff82440e00 starting wait for work.
> [ 278.686670] rcun ffffffff82440e00 completed wait for work.
> [ 278.686927] rcun ffffffff82440e00 initiating boost.
> [ 278.703910] rcun ffffffff82440e00 completed boost.
> [ 278.704148] rcun ffffffff82440e00 awaking rcuc51.
> [ 278.723778] rcun ffffffff82440e00 awakened rcuc51.
> [ 278.724036] rcun ffffffff82440e00 starting wait for work.
> [ 278.762564] rcun ffffffff82440e00 completed wait for work.
> [ 278.762863] rcun ffffffff82440e00 initiating boost.
> [ 278.763540] rcun ffffffff82440e00 completed boost.
> [ 278.763782] rcun ffffffff82440e00 awaking rcuc51.
> [ 278.764012] rcun ffffffff82440e00 awakened rcuc51.
> [ 278.783768] rcun ffffffff82440e00 starting wait for work.
> [ 278.784047] rcun ffffffff82440e00 completed wait for work.
> [ 278.803684] rcun ffffffff82440e00 initiating boost.
> [ 278.803937] rcun ffffffff82440e00 completed boost.
> [ 278.823598] rcun ffffffff82440e00 awaking rcuc51.
> [ 278.823851] rcun ffffffff82440e00 awakened rcuc51.
> [ 278.843603] rcun ffffffff82440e00 starting wait for work.
> [ 278.922171] rcun ffffffff82441300 completed wait for work.
> [ 278.922498] rcun ffffffff82441300 initiating boost.
> [ 278.922762] rcun ffffffff82441300 completed boost.
> [ 278.934066] rcun ffffffff82441300 awaking rcuc131.
> [ 278.934376] rcun ffffffff82441300 awakened rcuc131.
> [ 278.953529] rcun ffffffff82441300 starting wait for work.
> [ 279.017973] rcun ffffffff82440e00 completed wait for work.
> [ 279.018288] rcun ffffffff82440e00 initiating boost.
> [ 279.018515] rcun ffffffff82440e00 completed boost.
> [ 279.033336] rcun ffffffff82440e00 awaking rcuc51.
> [ 279.034041] rcun ffffffff82440e00 awakened rcuc51.
> [ 279.053188] rcun ffffffff82440e00 starting wait for work.
> [ 279.149846] rcun ffffffff82441300 completed wait for work.
> [ 279.150185] rcun ffffffff82441300 initiating boost.
> [ 279.150438] rcun ffffffff82441300 completed boost.
> [ 279.163080] rcun ffffffff82441300 awaking rcuc131.
> [ 279.163341] rcun ffffffff82441300 awakened rcuc131.
> [ 279.183285] rcun ffffffff82441300 starting wait for work.
> [ 279.313608] rcun ffffffff82441300 completed wait for work.
> [ 279.313983] rcun ffffffff82441300 initiating boost.
> [ 279.314216] rcun ffffffff82441300 completed boost.
> [ 279.332841] rcun ffffffff82441300 awaking rcuc131.
> [ 279.333359] rcun ffffffff82441300 awakened rcuc131.
> [ 279.352563] rcun ffffffff82441300 starting wait for work.
> [ 279.409412] rcun ffffffff82441300 completed wait for work.
> [ 279.409775] rcun ffffffff82441300 initiating boost.
> [ 279.410057] rcun ffffffff82441300 completed boost.
> [ 279.422561] rcun ffffffff82441300 awaking rcuc131.
> [ 279.422810] rcun ffffffff82441300 awakened rcuc131.
> [ 279.442473] rcun ffffffff82441300 starting wait for work.
> [ 279.932452] rcun ffffffff82441100 completed wait for work.
> [ 279.932806] rcun ffffffff82441100 initiating boost.
> [ 279.933047] rcun ffffffff82441100 completed boost.
> [ 279.952298] rcun ffffffff82441100 awaking rcuc110.
> [ 279.952658] rcun ffffffff82441100 awakened rcuc110.
> [ 279.971749] rcun ffffffff82441100 starting wait for work.
> [ 279.972249] rcun ffffffff82441100 completed wait for work.
> [ 279.991659] rcun ffffffff82441100 initiating boost.
> [ 279.992066] rcun ffffffff82441100 completed boost.
> [ 280.011403] rcun ffffffff82441100 awaking rcuc110.
> [ 280.011658] rcun ffffffff82441100 awakened rcuc110.
> [ 280.012070] rcun ffffffff82441100 starting wait for work.
> [ 280.112094] rcun ffffffff82440b00 completed wait for work.
> [ 280.112427] rcun ffffffff82440b00 initiating boost.
> [ 280.112674] rcun ffffffff82440b00 completed boost.
> [ 280.131375] rcun ffffffff82440b00 awaking rcuc11.
> [ 280.131651] rcun ffffffff82440b00 awakened rcuc11.
> [ 280.151524] rcun ffffffff82440b00 starting wait for work.
> [ 280.459704] rcun ffffffff82440b00 completed wait for work.
> [ 280.459997] rcun ffffffff82440b00 initiating boost.
> [ 280.460228] rcun ffffffff82440b00 completed boost.
> [ 280.470779] rcun ffffffff82440b00 awaking rcuc0.
> [ 280.471062] rcun ffffffff82440b00 awakened rcuc0.
> [ 280.490721] rcun ffffffff82440b00 starting wait for work.
> [ 280.567316] rcun ffffffff82441400 completed wait for work.
> [ 280.567647] rcun ffffffff82441400 initiating boost.
> [ 280.567897] rcun ffffffff82441400 completed boost.
> [ 280.580815] rcun ffffffff82441400 awaking rcuc151.
> [ 280.581116] rcun ffffffff82441400 awakened rcuc151.
> [ 280.600382] rcun ffffffff82441400 starting wait for work.
> [ 280.695170] rcun ffffffff82440f00 starting wait for work.
> [ 280.695506] rcun ffffffff82440f00 completed wait for work.
> [ 280.695847] rcun ffffffff82440f00 initiating boost.
> [ 280.710661] rcun ffffffff82440f00 completed boost.
> [ 280.711207] rcun ffffffff82440f00 awaking rcuc71.
> [ 280.730198] rcun ffffffff82440f00 awakened rcuc71.
> [ 280.730443] rcun ffffffff82440f00 starting wait for work.
> [ 281.601394] rcun ffffffff82440c00 completed wait for work.
> [ 281.601753] rcun ffffffff82440c00 initiating boost.
> [ 281.602004] rcun ffffffff82440c00 completed boost.
> [ 281.618891] rcun ffffffff82440c00 awaking rcuc30.
> [ 281.619164] rcun ffffffff82440c00 awakened rcuc30.
> [ 281.638755] rcun ffffffff82440c00 starting wait for work.
> [ 281.729334] rcun ffffffff82441300 completed wait for work.
> [ 281.729661] rcun ffffffff82441300 initiating boost.
> [ 281.729920] rcun ffffffff82441300 completed boost.
> [ 281.748587] rcun ffffffff82441300 awaking rcuc131.
> [ 281.748871] rcun ffffffff82441300 awakened rcuc131.
> [ 281.768287] rcun ffffffff82441300 starting wait for work.
> [ 281.905078] rcun ffffffff82440b00 completed wait for work.
> [ 281.905380] rcun ffffffff82440b00 initiating boost.
> [ 281.905623] rcun ffffffff82440b00 completed boost.
> [ 281.918170] rcun ffffffff82440b00 awaking rcuc11.
> [ 281.918450] rcun ffffffff82440b00 awakened rcuc11.
> [ 281.938055] rcun ffffffff82440b00 starting wait for work.
> [ 282.240380] rcun ffffffff82441300 completed wait for work.
> [ 282.240667] rcun ffffffff82441300 initiating boost.
> [ 282.240890] rcun ffffffff82441300 completed boost.
> [ 282.257498] rcun ffffffff82441300 awaking rcuc130.
> [ 282.257772] rcun ffffffff82441300 awakened rcuc130.
> [ 282.277380] rcun ffffffff82441300 starting wait for work.
> [ 282.304255] rcun ffffffff82441300 completed wait for work.
> [ 282.304551] rcun ffffffff82441300 initiating boost.
> [ 282.304792] rcun ffffffff82441300 completed boost.
> [ 282.317376] rcun ffffffff82441300 awaking rcuc130.
> [ 282.317639] rcun ffffffff82441300 awakened rcuc130.
> [ 282.337291] rcun ffffffff82441300 starting wait for work.
> [ 282.427834] rcun ffffffff82440e00 completed wait for work.
> [ 282.428165] rcun ffffffff82440e00 initiating boost.
> [ 282.428404] rcun ffffffff82440e00 completed boost.
> [ 282.447168] rcun ffffffff82440e00 awaking rcuc50.
> [ 282.447398] rcun ffffffff82440e00 awakened rcuc50.
> [ 282.467022] rcun ffffffff82440e00 starting wait for work.
> [ 282.543751] rcun ffffffff82441300 completed wait for work.
> [ 282.544030] rcun ffffffff82441300 initiating boost.
> [ 282.544262] rcun ffffffff82441300 completed boost.
> [ 282.556969] rcun ffffffff82441300 awaking rcuc130.
> [ 282.557221] rcun ffffffff82441300 awakened rcuc130.
> [ 282.576959] rcun ffffffff82441300 starting wait for work.
> [ 282.651510] rcun ffffffff82440e00 completed wait for work.
> [ 282.651859] rcun ffffffff82440e00 initiating boost.
> [ 282.652115] rcun ffffffff82440e00 completed boost.
> [ 282.666799] rcun ffffffff82440e00 awaking rcuc50.
> [ 282.667062] rcun ffffffff82440e00 awakened rcuc50.
> [ 282.686638] rcun ffffffff82440e00 starting wait for work.
> [ 283.469957] rcun ffffffff82440c00 completed wait for work.
> [ 283.470235] rcun ffffffff82440c00 initiating boost.
> [ 283.470457] rcun ffffffff82440c00 completed boost.
> [ 283.485312] rcun ffffffff82440c00 awaking rcuc20.
> [ 283.485548] rcun ffffffff82440c00 awakened rcuc20.
> [ 283.505188] rcun ffffffff82440c00 starting wait for work.
> [ 283.513893] rcun ffffffff82440c00 completed wait for work.
> [ 283.525161] rcun ffffffff82440c00 initiating boost.
> [ 283.525381] rcun ffffffff82440c00 completed boost.
> [ 283.545051] rcun ffffffff82440c00 awaking rcuc20.
> [ 283.545289] rcun ffffffff82440c00 awakened rcuc20.
> [ 283.545497] rcun ffffffff82440c00 starting wait for work.
> [ 283.577780] rcun ffffffff82440c00 completed wait for work.
> [ 283.578067] rcun ffffffff82440c00 initiating boost.
> [ 283.585133] rcun ffffffff82440c00 completed boost.
> [ 283.585366] rcun ffffffff82440c00 awaking rcuc20.
> [ 283.604979] rcun ffffffff82440c00 awakened rcuc20.
> [ 283.605219] rcun ffffffff82440c00 starting wait for work.
> [ 283.673621] rcun ffffffff82440c00 completed wait for work.
> [ 283.673904] rcun ffffffff82440c00 initiating boost.
> [ 283.674126] rcun ffffffff82440c00 completed boost.
> [ 283.684951] rcun ffffffff82440c00 awaking rcuc20.
> [ 283.685186] rcun ffffffff82440c00 awakened rcuc20.
> [ 283.704835] rcun ffffffff82440c00 starting wait for work.
> [ 283.721536] rcun ffffffff82440c00 completed wait for work.
> [ 283.724733] rcun ffffffff82440c00 initiating boost.
> [ 283.724974] rcun ffffffff82440c00 completed boost.
> [ 283.744676] rcun ffffffff82440c00 awaking rcuc20.
> [ 283.744921] rcun ffffffff82440c00 awakened rcuc20.
> [ 283.745142] rcun ffffffff82440c00 starting wait for work.
> [ 283.849306] rcun ffffffff82440c00 completed wait for work.
> [ 283.849580] rcun ffffffff82440c00 initiating boost.
> [ 283.849806] rcun ffffffff82440c00 completed boost.
> [ 283.864625] rcun ffffffff82440c00 awaking rcuc20.
> [ 283.864859] rcun ffffffff82440c00 awakened rcuc20.
> [ 283.884509] rcun ffffffff82440c00 starting wait for work.
> [ 283.897233] rcun ffffffff82440c00 completed wait for work.
> [ 283.904500] rcun ffffffff82440c00 initiating boost.
> [ 283.904740] rcun ffffffff82440c00 completed boost.
> [ 283.924388] rcun ffffffff82440c00 awaking rcuc20.
> [ 283.924639] rcun ffffffff82440c00 awakened rcuc20.
> [ 283.924857] rcun ffffffff82440c00 starting wait for work.
> [ 283.961137] rcun ffffffff82440c00 completed wait for work.
> [ 283.961412] rcun ffffffff82440c00 initiating boost.
> [ 283.964375] rcun ffffffff82440c00 completed boost.
> [ 283.964585] rcun ffffffff82440c00 awaking rcuc20.
> [ 283.984347] rcun ffffffff82440c00 awakened rcuc20.
> [ 283.984580] rcun ffffffff82440c00 starting wait for work.
> [ 284.064957] rcun ffffffff82440c00 completed wait for work.
> [ 284.065249] rcun ffffffff82440c00 initiating boost.
> [ 284.065462] rcun ffffffff82440c00 completed boost.
> [ 284.084281] rcun ffffffff82440c00 awaking rcuc20.
> [ 284.084506] rcun ffffffff82440c00 awakened rcuc20.
> [ 284.104135] rcun ffffffff82440c00 starting wait for work.
> [ 284.124914] rcun ffffffff82440c00 completed wait for work.
> [ 284.125251] rcun ffffffff82440c00 initiating boost.
> [ 284.125488] rcun ffffffff82440c00 completed boost.
> [ 284.144394] rcun ffffffff82440c00 awaking rcuc20.
> [ 284.144636] rcun ffffffff82440c00 awakened rcuc20.
> [ 284.163985] rcun ffffffff82440c00 starting wait for work.
> [ 284.352449] rcun ffffffff82440c00 completed wait for work.
> [ 284.352722] rcun ffffffff82440c00 initiating boost.
> [ 284.352965] rcun ffffffff82440c00 completed boost.
> [ 284.363729] rcun ffffffff82440c00 awaking rcuc21.
> [ 284.363952] rcun ffffffff82440c00 awakened rcuc21.
> [ 284.383609] rcun ffffffff82440c00 starting wait for work.
> [ 284.400355] rcun ffffffff82440c00 completed wait for work.
> [ 284.403541] rcun ffffffff82440c00 initiating boost.
> [ 284.403752] rcun ffffffff82440c00 completed boost.
> [ 284.423478] rcun ffffffff82440c00 awaking rcuc21.
> [ 284.423730] rcun ffffffff82440c00 awakened rcuc21.
> [ 284.423961] rcun ffffffff82440c00 starting wait for work.
> [ 284.464264] rcun ffffffff82440c00 completed wait for work.
> [ 284.464531] rcun ffffffff82440c00 initiating boost.
> [ 284.464739] rcun ffffffff82440c00 completed boost.
> [ 284.483510] rcun ffffffff82440c00 awaking rcuc21.
> [ 284.483725] rcun ffffffff82440c00 awakened rcuc21.
> [ 284.503396] rcun ffffffff82440c00 starting wait for work.
> [ 284.524166] rcun ffffffff82440c00 completed wait for work.
> [ 284.524430] rcun ffffffff82440c00 initiating boost.
> [ 284.524660] rcun ffffffff82440c00 completed boost.
> [ 284.543410] rcun ffffffff82440c00 awaking rcuc21.
> [ 284.543634] rcun ffffffff82440c00 awakened rcuc21.
> [ 284.563295] rcun ffffffff82440c00 starting wait for work.
> done
> Loading required kernel modules done
> Activating device mapper...
> FATAL: Could not load /lib/modules/2.6.39-tip-yh-05892-gb7b703b-dirty/modules.dep: No such file or directory
> failed
> Starting MD Raid unused
> Waiting for udev to settle...
> Scanning for LVM volume groups...
> File descriptor 3 left open
> Reading all physical volumes. This may take a while...
> Activating LVM volume groups...
> File descriptor 3 left open
> done
> Waiting for /firmware
> microcode . no more events
> Checking file systems...
> fsck 1.41.1 (01-Sep-2008)
> Checking all file systems. done
> done
> Mounting local file systems...
> /proc on /proc type proc (rw)
> sysfs on /sys type sysfs (rw)
> debugfs on /sys/kernel/debug type debugfs (rw)
> udev on /dev type tmpfs (rw)
> devpts on /dev/pts type devpts (rw,mode=0620,gid=5)
> /firmware on /lib/firmware type tmpfs (rw)
> microcode on /usr/lib/microcode type tmpfs (rw) done
> Activating remaining swap-devices in /etc/fstab... done
> Setting up linker cache (/etc/ld.so.cache) using ldconfig done
> Creating /var/log/boot.msg done
> Using boot-specified hostname 'lb-g5plus-1t-host'
> Setting up hostname 'lb-g5plus-1t-host' done
> Setting up loopback interface lo
> lo IP address: 127.0.0.1/8
> IP address: 127.0.0.2/8
> done
> System Boot Control: The system has been set up
> Skipped features: boot.md
> System Boot Control: Running /etc/init.d/boot.local done
> INIT: Entering runlevel: 3
> Boot logging started on /dev/ttyS0(/dev/console) at Wed May 25 13:44:05 2011
> Master Resource Control: previous runlevel: N, switching to runlevel:3
> Starting D-Bus daemon done
> Initializing random number generator done
> [ 287.794818] rcun ffffffff82440f00 completed wait for work.
> [ 287.795218] rcun ffffffff82440f00 initiating boost.
> [ 287.795440] rcun ffffffff82440f00 completed boost.
> [ 287.807922] rcun ffffffff82440f00 awaking rcuc71.
> [ 287.808186] rcun ffffffff82440f00 awakened rcuc71.
> [ 287.808195] rcun ffffffff82440f00 starting wait for work.
> Starting syslog services done
> [ 288.693183] rcun ffffffff82440e00 completed wait for work.
> [ 288.693586] rcun ffffffff82440e00 initiating boost.
> [ 288.693810] rcun ffffffff82440e00 completed boost.
> [ 288.706108] rcun ffffffff82440e00 awaking rcuc50.
> [ 288.706352] rcun ffffffff82440e00 awakened rcuc50.
> [ 288.725895] rcun ffffffff82440e00 starting wait for work.
> [ 288.726166] rcun ffffffff82440e00 completed wait for work.
> [ 288.745842] rcun ffffffff82440e00 initiating boost.
> [ 288.746067] rcun ffffffff82440e00 completed boost.
> [ 288.765741] rcun ffffffff82440e00 awaking rcuc50.
> [ 288.765967] rcun ffffffff82440e00 awakened rcuc50.
> [ 288.766203] rcun ffffffff82440e00 starting wait for work.
> Loading CPUFreq modules done
> Starting HAL daemon done
> Setting up (localfs) network interfaces:
> lo
> lo IP address: 127.0.0.1/8
> IP address: 127.0.0.2/8 done
> [ 289.323903] rcun ffffffff82440c00 completed wait for work.
> [ 289.324239] rcun ffffffff82440c00 initiating boost.
> [ 289.324458] rcun ffffffff82440c00 completed boost.
> [ 289.334891] rcun ffffffff82440c00 awaking rcuc20.
> [ 289.335112] rcun ffffffff82440c00 awakened rcuc20.
> [ 289.354785] rcun ffffffff82440c00 starting wait for work.
> eth0 device: Intel Corporation 82571EB Gigabit Ethernet Controller (rev 06)
> No configuration found for eth0 unused
> eth1 device: Intel Corporation 82571EB Gigabit Ethernet Controller (rev 06)
> No configuration found for eth1 unused
> [ 289.859076] rcun ffffffff82440c00 completed wait for work.
> [ 289.859428] rcun ffffffff82440c00 initiating boost.
> [ 289.859641] rcun ffffffff82440c00 completed boost.
> [ 289.873915] rcun ffffffff82440c00 awaking rcuc31.
> [ 289.874127] rcun ffffffff82440c00 awakened rcuc31.
> [ 289.893814] rcun ffffffff82440c00 starting wait for work.
> eth10 device: Intel Corporation 82576 Gigabit Network Connection (rev 01)
> No configuration found for eth10 unused
> [ 290.106822] rcun ffffffff82440b00 completed wait for work.
> [ 290.107203] rcun ffffffff82440b00 initiating boost.
> [ 290.107436] rcun ffffffff82440b00 completed boost.
> [ 290.123462] rcun ffffffff82440b00 awaking rcuc11.
> [ 290.123677] rcun ffffffff82440b00 awakened rcuc11.
> [ 290.143342] rcun ffffffff82440b00 starting wait for work.
> eth11 device: Intel Corporation 82576 Gigabit Network Connection (rev 01)
> No configuration found for eth11 unused
> [ 290.350351] rcun ffffffff82441100 completed wait for work.
> [ 290.350744] rcun ffffffff82441100 initiating boost.
> [ 290.351016] rcun ffffffff82441100 completed boost.
> [ 290.363076] rcun ffffffff82441100 awaking rcuc111.
> [ 290.363345] rcun ffffffff82441100 awakened rcuc111.
> [ 290.382943] rcun ffffffff82441100 starting wait for work.
> eth12 device: Intel Corporation 82599EB 10 Gigabit Network Connection (rev 01)
> No configuration found for eth12 unused
> [ 290.610137] rcun ffffffff82440b00 completed wait for work.
> [ 290.610487] rcun ffffffff82440b00 initiating boost.
> [ 290.610719] rcun ffffffff82440b00 completed boost.
> [ 290.622562] rcun ffffffff82440b00 awaking rcuc11.
> [ 290.622774] rcun ffffffff82440b00 awakened rcuc11.
> [ 290.642453] rcun ffffffff82440b00 starting wait for work.
> [ 290.642720] rcun ffffffff82440b00 completed wait for work.
> [ 290.662423] rcun ffffffff82440b00 initiating boost.
> [ 290.662643] rcun ffffffff82440b00 completed boost.
> eth13 device: Intel Corporation 82599EB 10 Gigabit Network Connection (rev 01)
> [ 290.682708] rcun ffffffff82440b00 awaking rcuc11.
> [ 290.702367] rcun ffffffff82440b00 awakened rcuc11.
> No configuration f[ 290.702694] rcun ffffffff82440b00 starting wait for work.
> ound for eth13 unused
> [ 290.865245] rcun ffffffff82440e00 completed wait for work.
> [ 290.865586] rcun ffffffff82440e00 initiating boost.
> [ 290.865802] rcun ffffffff82440e00 completed boost.
> [ 290.882235] rcun ffffffff82440e00 awaking rcuc51.
> [ 290.882530] rcun ffffffff82440e00 awakened rcuc51.
> [ 290.902004] rcun ffffffff82440e00 starting wait for work.
> eth14 device: Intel Corporation 82599EB 10-Gigabit KX4 Network Connection (rev 01)
> No configuration found for eth14 unused
> [ 291.128769] rcun ffffffff82440c00 completed wait for work.
> [ 291.129110] rcun ffffffff82440c00 initiating boost.
> [ 291.129333] rcun ffffffff82440c00 completed boost.
> [ 291.141675] rcun ffffffff82440c00 awaking rcuc31.
> [ 291.141904] rcun ffffffff82440c00 awakened rcuc31.
> [ 291.161527] rcun ffffffff82440c00 starting wait for work.
> eth15 device: Intel Corporation 82599EB 10-Gigabit KX4 Network Connection (rev 01)
> No configuration found for eth15 unused
> [ 291.380340] rcun ffffffff82440c00 completed wait for work.
> [ 291.380664] rcun ffffffff82440c00 initiating boost.
> [ 291.380883] rcun ffffffff82440c00 completed boost.
> [ 291.391214] rcun ffffffff82440c00 awaking rcuc21.
> [ 291.391431] rcun ffffffff82440c00 awakened rcuc21.
> [ 291.411105] rcun ffffffff82440c00 starting wait for work.
> [ 291.432271] rcun ffffffff82440c00 completed wait for work.
> [ 291.432551] rcun ffffffff82440c00 initiating boost.
> [ 291.432785] rcun ffffffff82440c00 completed boost.
> [ 291.451161] rcun ffffffff82440c00 awaking rcuc21.
> [ 291.451167] rcun ffffffff82440c00 awakened rcuc21.
> [ 291.451170] rcun ffffffff82440c00 starting wait for work.
> eth16 device: Intel Corporation 82599EB 10-Gigabit KX4 Network Connection (rev 01)
> No configuration found for eth16 unused
> [ 291.652073] rcun ffffffff82440b00 completed wait for work.
> [ 291.652448] rcun ffffffff82440b00 initiating boost.
> [ 291.652741] rcun ffffffff82440b00 completed boost.
> [ 291.670699] rcun ffffffff82440b00 awaking rcuc1.
> [ 291.670945] rcun ffffffff82440b00 awakened rcuc1.
> [ 291.690597] rcun ffffffff82440b00 starting wait for work.
> eth17 device: Intel Corporation 82599EB 10-Gigabit KX4 Network Connection (rev 01)
> No configuration found for eth17 unused
> [ 291.931570] rcun ffffffff82441000 starting wait for work.
> [ 291.931899] rcun ffffffff82441000 completed wait for work.
> [ 291.932142] rcun ffffffff82441000 initiating boost.
> [ 291.950219] rcun ffffffff82441000 completed boost.
> [ 291.950445] rcun ffffffff82441000 awaking rcuc90.
> [ 291.970127] rcun ffffffff82441000 awakened rcuc90.
> [ 291.970344] rcun ffffffff82441000 starting wait for work.
> [ 291.990092] rcun ffffffff82441000 completed wait for work.
> [ 291.990101] rcun ffffffff82441000 initiating boost.
> [ 291.990105] rcun ffffffff82441000 completed boost.
> [ 291.990109] rcun ffffffff82441000 awaking rcuc90.
> [ 291.990119] rcun ffffffff82441000 awakened rcuc90.
> [ 291.990123] rcun ffffffff82441000 starting wait for work.
> eth18 device: Intel Corporation 82599EB 10 Gigabit Network Connection (rev 01)
> No configuration found for eth18 unused
> eth19 device: Intel Corporation 82599EB 10 Gigabit Network Connection (rev 01)
> No configuration found for eth19 unused
> [ 292.470547] rcun ffffffff82440e00 completed wait for work.
> [ 292.470936] rcun ffffffff82440e00 initiating boost.
> [ 292.471191] rcun ffffffff82440e00 completed boost.
> [ 292.489291] rcun ffffffff82440e00 awaking rcuc51.
> [ 292.489550] rcun ffffffff82440e00 awakened rcuc51.
> [ 292.509226] rcun ffffffff82440e00 starting wait for work.
> [ 292.509478] rcun ffffffff82440e00 completed wait for work.
> [ 292.529136] rcun ffffffff82440e00 initiating boost.
> [ 292.529141] rcun ffffffff82440e00 completed boost.
> [ 292.529144] rcun ffffffff82440e00 awaking rcuc51.
> [ 292.529151] rcun ffffffff82440e00 awakened rcuc51.
> [ 292.529155] rcun ffffffff82440e00 starting wait for work.
> eth2 device: Intel Corporation 82571EB Gigabit Ethernet Controller (rev 06)
> No configuration found for eth2 unused
> [ 292.753993] rcun ffffffff82440c00 completed wait for work.
> [ 292.754348] rcun ffffffff82440c00 initiating boost.
> [ 292.754596] rcun ffffffff82440c00 completed boost.
> [ 292.768779] rcun ffffffff82440c00 awaking rcuc31.
> [ 292.769018] rcun ffffffff82440c00 awakened rcuc31.
> [ 292.788632] rcun ffffffff82440c00 starting wait for work.
> eth20 device: Intel Corporation 82599EB 10-Gigabit KX4 Network Connection (rev 01)
> No configuration found for eth20 unused
> [ 292.985585] rcun ffffffff82440c00 completed wait for work.
> [ 292.985925] rcun ffffffff82440c00 initiating boost.
> [ 292.986150] rcun ffffffff82440c00 completed boost.
> [ 292.998422] rcun ffffffff82440c00 awaking rcuc31.
> [ 292.998647] rcun ffffffff82440c00 awakened rcuc31.
> [ 293.018318] rcun ffffffff82440c00 starting wait for work.
> eth21 device: Intel Corporation 82599EB 10-Gigabit KX4 Network Connection (rev 01)
> No configuration found for eth21 unused
> [ 293.289596] rcun ffffffff82440b00 completed wait for work.
> [ 293.289987] rcun ffffffff82440b00 initiating boost.
> [ 293.290245] rcun ffffffff82440b00 completed boost.
> [ 293.307893] rcun ffffffff82440b00 awaking rcuc1.
> [ 293.308159] rcun ffffffff82440b00 awakened rcuc1.
> [ 293.327728] rcun ffffffff82440b00 starting wait for work.
> [ 293.337111] rcun ffffffff82440b00 completed wait for work.
> [ 293.347737] rcun ffffffff82440b00 initiating boost.
> [ 293.347958] rcun ffffffff82440b00 completed boost.
> eth22 de[ 293.367776] rcun ffffffff82440b00 awaking rcuc1.
> vice: Intel Corporation 82599EB [ 293.368186] rcun ffffffff82440b00 awakened rcuc1.
> 10 Gigabit Netwo[ 293.368191] rcun ffffffff82440b00 starting wait for work.
> rk Connection (rev 01)
> No configuration found for eth22 unused
> eth23 device: Intel Corporation 82599EB 10 Gigabit Network Connection (rev 01)
> No configuration found for eth23 unused
> eth24 device: Intel Corporation 82599EB 10-Gigabit KX4 Network Connection (rev 01)
> No configuration found for eth24 unused
> [ 294.075710] rcun ffffffff82440e00 completed wait for work.
> [ 294.076063] rcun ffffffff82440e00 initiating boost.
> [ 294.076287] rcun ffffffff82440e00 completed boost.
> [ 294.086523] rcun ffffffff82440e00 awaking rcuc51.
> [ 294.086800] rcun ffffffff82440e00 awakened rcuc51.
> [ 294.106385] rcun ffffffff82440e00 starting wait for work.
> [ 294.135592] rcun ffffffff82440e00 completed wait for work.
> [ 294.135876] rcun ffffffff82440e00 initiating boost.
> [ 294.136103] rcun ffffffff82440e00 completed boost.
> [ 294.146373] rcun ffffffff82440e00 awaking rcuc51.
> [ 294.146643] rcun ffffffff82440e00 awakened rcuc51.
> [ 294.166295] rcun ffffffff82440e00 starting wait for work.
> eth25 device: Intel Corporation 82599EB 10-Gigabit KX4 Network Connection (rev 01)
> No configuration found for eth25 unused
> [ 294.383392] rcun ffffffff82440e00 completed wait for work.
> [ 294.383728] rcun ffffffff82440e00 initiating boost.
> [ 294.383945] rcun ffffffff82440e00 completed boost.
> [ 294.395907] rcun ffffffff82440e00 awaking rcuc51.
> [ 294.396134] rcun ffffffff82440e00 awakened rcuc51.
> [ 294.415794] rcun ffffffff82440e00 starting wait for work.
> eth26 device: QLogic Corp. 10GbE Converged Network Adapter (TCP/IP Networking) (rev 02)
> No configuration found for eth26 unused
> [ 294.658799] rcun ffffffff82440c00 completed wait for work.
> [ 294.659130] rcun ffffffff82440c00 initiating boost.
> [ 294.659341] rcun ffffffff82440c00 completed boost.
> [ 294.675419] rcun ffffffff82440c00 awaking rcuc31.
> [ 294.675645] rcun ffffffff82440c00 awakened rcuc31.
> [ 294.695468] rcun ffffffff82440c00 starting wait for work.
> eth27 device: QLogic Corp. 10GbE Converged Network Adapter (TCP/IP Networking) (rev 02)
> No configuration found for eth27 unused
> [ 294.918239] rcun ffffffff82440b00 completed wait for work.
> [ 294.918602] rcun ffffffff82440b00 initiating boost.
> [ 294.918834] rcun ffffffff82440b00 completed boost.
> [ 294.934983] rcun ffffffff82440b00 awaking rcuc0.
> [ 294.935245] rcun ffffffff82440b00 awakened rcuc0.
> [ 294.954854] rcun ffffffff82440b00 starting wait for work.
> eth3 device: Intel Corporation 82571EB Gigabit Ethernet Controller (rev 06)
> No configuration found for eth3 unused
> [ 295.233919] rcun ffffffff82440d00 starting wait for work.
> [ 295.234268] rcun ffffffff82440d00 completed wait for work.
> [ 295.234550] rcun ffffffff82440d00 initiating boost.
> [ 295.244455] rcun ffffffff82440d00 completed boost.
> [ 295.244686] rcun ffffffff82440d00 awaking rcuc40.
> eth4 de[ 295.264423] rcun ffffffff82440d00 awakened rcuc40.
> vice: Intel Corporation 82576 Gi[ 295.264682] rcun ffffffff82440d00 starting wait for work.
> gabit Network Connection (rev 01)
> No configuration found for eth4 unused
> [ 295.477285] rcun ffffffff82440f00 completed wait for work.
> [ 295.477635] rcun ffffffff82440f00 initiating boost.
> [ 295.477861] rcun ffffffff82440f00 completed boost.
> [ 295.494030] rcun ffffffff82440f00 awaking rcuc70.
> [ 295.494278] rcun ffffffff82440f00 awakened rcuc70.
> [ 295.513989] rcun ffffffff82440f00 starting wait for work.
> eth5 device: Intel Corporation 82576 Gigabit Network Connection (rev 01)
> No configuration found for eth5 unused
> [ 295.720833] rcun ffffffff82440d00 completed wait for work.
> [ 295.721156] rcun ffffffff82440d00 initiating boost.
> [ 295.721376] rcun ffffffff82440d00 completed boost.
> [ 295.733558] rcun ffffffff82440d00 awaking rcuc41.
> [ 295.733799] rcun ffffffff82440d00 awakened rcuc41.
> [ 295.753424] rcun ffffffff82440d00 starting wait for work.
> eth6 device: Intel Corporation 82576 Gigabit Network Connection (rev 01)
> No configuration found for eth6 unused
> [ 296.000356] rcun ffffffff82440c00 completed wait for work.
> [ 296.000716] rcun ffffffff82440c00 initiating boost.
> [ 296.000942] rcun ffffffff82440c00 completed boost.
> [ 296.013086] rcun ffffffff82440c00 awaking rcuc31.
> [ 296.013305] rcun ffffffff82440c00 awakened rcuc31.
> [ 296.032935] rcun ffffffff82440c00 starting wait for work.
> eth7 device: Intel Corporation 82576 Gigabit Network Connection (rev 01)
> No configuration found for eth7 unused
> [ 296.220235] rcun ffffffff82440e00 completed wait for work.
> [ 296.220570] rcun ffffffff82440e00 initiating boost.
> [ 296.220796] rcun ffffffff82440e00 completed boost.
> [ 296.232694] rcun ffffffff82440e00 awaking rcuc51.
> [ 296.232934] rcun ffffffff82440e00 awakened rcuc51.
> [ 296.252558] rcun ffffffff82440e00 starting wait for work.
> [ 296.252841] rcun ffffffff82440e00 completed wait for work.
> [ 296.272515] rcun ffffffff82440e00 initiating boost.
> [ 296.272784] rcun ffffffff82440e00 completed boost.
> [ 296.292387] rcun ffffffff82440e00 awaking rcuc51.
> [ 296.292647] rcun ffffffff82440e00 awakened rcuc51.
> [ 296.292920] rcun ffffffff82440e00 starting wait for work.
> eth8 device: Intel Corporation 82576 Gigabit Network Connection (rev 01)
> No configuration found for eth8 unused
> [ 296.483877] rcun ffffffff82440b00 completed wait for work.
> [ 296.484237] rcun ffffffff82440b00 initiating boost.
> [ 296.484456] rcun ffffffff82440b00 completed boost.
> [ 296.502204] rcun ffffffff82440b00 awaking rcuc1.
> [ 296.502491] rcun ffffffff82440b00 awakened rcuc1.
> [ 296.522201] rcun ffffffff82440b00 starting wait for work.
> [ 296.522459] rcun ffffffff82440b00 completed wait for work.
> [ 296.542024] rcun ffffffff82440b00 initiating boost.
> [ 296.542317] rcun ffffffff82440b00 completed boost.
> [ 296.561935] rcun ffffffff82440b00 awaking rcuc1.
> [ 296.562213] rcun ffffffff82440b00 awakened rcuc1.
> [ 296.562431] rcun ffffffff82440b00 starting wait for work.
> eth9 device: Intel Corporation 82576 Gigabit Network Connection (rev 01)
> No configuration found for eth9 unused
> ib0 device: Mellanox Technologies MT26428 [ConnectX VPI PCIe 2.0 5GT/s - IB QDR / 10GigE] (rev b0)
> No configuration found for ib0 unused
> [ 297.014805] rcun ffffffff82440b00 completed wait for work.
> [ 297.015156] rcun ffffffff82440b00 initiating boost.
> [ 297.015406] rcun ffffffff82440b00 completed boost.
> [ 297.031238] rcun ffffffff82440b00 awaking rcuc1.
> [ 297.031490] rcun ffffffff82440b00 awakened rcuc1.
> [ 297.051130] rcun ffffffff82440b00 starting wait for work.
> ib1 device: Mellanox Technologies MT26428 [ConnectX VPI PCIe 2.0 5GT/s - IB QDR / 10GigE] (rev b0)
> No configuration found for ib1 unused
> Setting up service (localfs) network . . . . . . . . . . done
> Starting RPC portmap daemon done
> Setting up (remotefs) network interfaces:
> Setting up service (remotefs) network . . . . . . . . . . done
> Master Resource Control: runlevel 3 has been reached
> [ 298.843747] rcun ffffffff82440e00 completed wait for work.
> [ 298.844125] rcun ffffffff82440e00 initiating boost.
> [ 298.844380] rcun ffffffff82440e00 completed boost.
> [ 298.858327] rcun ffffffff82440e00 awaking rcuc52.
> [ 298.858648] rcun ffffffff82440e00 awakened rcuc52.
> [ 298.878014] rcun ffffffff82440e00 starting wait for work.
> [ 298.887761] rcun ffffffff82440c00 completed wait for work.
> [ 298.898179] rcun ffffffff82440c00 initiating boost.
> [ 298.898480] rcun ffffffff82440c00 completed boost.
> [ 298.917825] rcun ffffffff82440c00 awaking rcuc30.
> [ 298.918148] rcun ffffffff82440c00 awakened rcuc30.
> [ 298.918399] rcun ffffffff82440c00 starting wait for work.
> [ 299.051210] rcun ffffffff82441300 completed wait for work.
> [ 299.051271] rcun ffffffff82440d00 completed wait for work.
> [ 299.051279] rcun ffffffff82440d00 initiating boost.
> [ 299.051283] rcun ffffffff82440d00 completed boost.
> [ 299.051288] rcun ffffffff82440d00 awaking rcuc40.
> [ 299.051300] rcun ffffffff82440c00 completed wait for work.
> [ 299.051314] rcun ffffffff82440c00 initiating boost.
> [ 299.051323] rcun ffffffff82440c00 completed boost.
> [ 299.051328] rcun ffffffff82440c00 awaking rcuc31.
> [ 299.051356] rcun ffffffff82440d00 awakened rcuc40.
> [ 299.051360] rcun ffffffff82440d00 starting wait for work.
> [ 299.051383] rcun ffffffff82440c00 awakened rcuc31.
> [ 299.051388] rcun ffffffff82440c00 starting wait for work.
> [ 299.148138] rcun ffffffff82441300 initiating boost.
> [ 299.167706] rcun ffffffff82441300 completed boost.
> [ 299.167993] rcun ffffffff82441300 awaking rcuc132.
> [ 299.187516] rcun ffffffff82441300 awakened rcuc132.
> [ 299.187841] rcun ffffffff82441300 starting wait for work.
> [ 299.223164] rcun ffffffff82441300 completed wait for work.
> [ 299.223485] rcun ffffffff82441300 initiating boost.
> [ 299.227367] rcun ffffffff82441300 completed boost.
> [ 299.227654] rcun ffffffff82441300 awaking rcuc132.
> [ 299.227969] rcun ffffffff82441300 awakened rcuc132.
> [ 299.247460] rcun ffffffff82441300 starting wait for work.
> [ 299.278920] rcun ffffffff82440d00 completed wait for work.
> [ 299.279251] rcun ffffffff82440d00 initiating boost.
> [ 299.279497] rcun ffffffff82440d00 completed boost.
> [ 299.297867] rcun ffffffff82440d00 awaking rcuc40.
> [ 299.298180] rcun ffffffff82440d00 awakened rcuc40.
> [ 299.317166] rcun ffffffff82440d00 starting wait for work.
> [ 299.334809] rcun ffffffff82441300 completed wait for work.
> [ 299.336979] rcun ffffffff82441300 initiating boost.
> [ 299.337250] rcun ffffffff82441300 completed boost.
> [ 299.338720] rcun ffffffff82441100 completed wait for work.
> [ 299.338737] rcun ffffffff82441100 initiating boost.
> [ 299.338745] rcun ffffffff82441100 completed boost.
> [ 299.338752] rcun ffffffff82441100 awaking rcuc102.
> [ 299.338803] rcun ffffffff82441100 awakened rcuc102.
> [ 299.338809] rcun ffffffff82441100 starting wait for work.
> [ 299.342935] rcun ffffffff82440f00 completed wait for work.
> [ 299.342964] rcun ffffffff82440f00 initiating boost.
> [ 299.342991] rcun ffffffff82440f00 completed boost.
> [ 299.343009] rcun ffffffff82440f00 awaking rcuc70.
> [ 299.343064] rcun ffffffff82440f00 awakened rcuc70.
> [ 299.343077] rcun ffffffff82440f00 starting wait for work.
> [ 299.350627] rcun ffffffff82441100 completed wait for work.
> [ 299.350634] rcun ffffffff82441100 initiating boost.
> [ 299.350638] rcun ffffffff82441100 completed boost.
> [ 299.350641] rcun ffffffff82441100 awaking rcuc102.
> [ 299.350652] rcun ffffffff82441100 awakened rcuc102.
> [ 299.350655] rcun ffffffff82441100 starting wait for work.
> [ 299.350689] rcun ffffffff82440f00 completed wait for work.
> [ 299.350701] rcun ffffffff82440f00 initiating boost.
> [ 299.350708] rcun ffffffff82440f00 completed boost.
> [ 299.350716] rcun ffffffff82440f00 awaking rcuc70.
> [ 299.350807] rcun ffffffff82440f00 awakened rcuc70.
> [ 299.350815] rcun ffffffff82440f00 starting wait for work.
> [ 299.557141] rcun ffffffff82441300 awaking rcuc132.
> [ 299.557143] rcun ffffffff82441300 awakened rcuc132.
> [ 299.557145] rcun ffffffff82441300 starting wait for work.
>
> lb-g5plus-1t-host login:
> lb-g5plus-1t-host login: [ 379.823934] INFO: task rcun0:8 blocked for more than 120 seconds.
> [ 379.824295] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> [ 379.843811] rcun0 D 0000000000000000 0 8 2 0x00000000
> [ 379.844152] ffff882070d47e90 0000000000000046 ffff882070d46000 0000000000004000
> [ 379.844178] 00000000001d1f40 ffff882070d47fd8 00000000001d1f40 ffff882070d47fd8
> [ 379.844204] 0000000000004000 00000000001d1f40 ffff882070d18000 ffff882070d4a2b0
> [ 379.844232] Call Trace:
> [ 379.844255] [<ffffffff810afa0a>] ? __lock_release+0x166/0x16f
> [ 379.844273] [<ffffffff81c21de9>] ? _raw_spin_unlock_irqrestore+0x3f/0x46
> [ 379.844287] [<ffffffff810cf297>] ? rcu_cpu_kthread_timer+0x44/0x44
> [ 379.844298] [<ffffffff810adcde>] ? trace_hardirqs_on+0xd/0xf
> [ 379.844309] [<ffffffff810cf297>] ? rcu_cpu_kthread_timer+0x44/0x44
> [ 379.844325] [<ffffffff81099e3d>] kthread+0x8c/0xa8
> [ 379.844342] [<ffffffff81c29ad4>] kernel_thread_helper+0x4/0x10
> [ 379.844353] [<ffffffff81c22080>] ? retint_restore_args+0xe/0xe
> [ 379.844364] [<ffffffff81099db1>] ? __init_kthread_worker+0x5b/0x5b
> [ 379.844375] [<ffffffff81c29ad0>] ? gs_change+0xb/0xb
> [ 379.844379] INFO: lockdep is turned off.
OK, so rcun0 covers CPUs 0-15. Looking above, we find that this
means "rcun ffffffff82440b00". And the last thing done by this
rcun kthread was "starting wait for work", which would be rcu_wait(),
which is as follows:
#define rcu_wait(cond) \
do { \
for (;;) { \
set_current_state(TASK_INTERRUPTIBLE); \
if (cond) \
break; \
schedule(); \
} \
__set_current_state(TASK_RUNNING); \
} while (0)
But this has the kthread waiting with TASK_INTERRUPTIBLE, which should
prevent the "blocked for more than 120 seconds" diagnostic.
> [ 379.844595] INFO: task rcun8:576 blocked for more than 120 seconds.
> [ 379.844598] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> [ 379.844602] rcun8 D 0000000000000000 0 576 2 0x00000000
> [ 379.844608] ffff881fff98de90 0000000000000046 ffff881fff98c000 0000000000004000
> [ 379.844634] 00000000001d1f40 ffff881fff98dfd8 00000000001d1f40 ffff881fff98dfd8
> [ 379.844658] 0000000000004000 00000000001d1f40 ffff882070d18000 ffff881fff9822b0
> [ 379.844683] Call Trace:
> [ 379.844694] [<ffffffff810afa0a>] ? __lock_release+0x166/0x16f
> [ 379.844705] [<ffffffff81c21de9>] ? _raw_spin_unlock_irqrestore+0x3f/0x46
> [ 379.844715] [<ffffffff810cf297>] ? rcu_cpu_kthread_timer+0x44/0x44
> [ 379.844726] [<ffffffff810adcde>] ? trace_hardirqs_on+0xd/0xf
> [ 379.844736] [<ffffffff810cf297>] ? rcu_cpu_kthread_timer+0x44/0x44
> [ 379.844747] [<ffffffff81099e3d>] kthread+0x8c/0xa8
> [ 379.844759] [<ffffffff81c29ad4>] kernel_thread_helper+0x4/0x10
> [ 379.844769] [<ffffffff81c22080>] ? retint_restore_args+0xe/0xe
> [ 379.844781] [<ffffffff81099db1>] ? __init_kthread_worker+0x5b/0x5b
> [ 379.844791] [<ffffffff81c29ad0>] ? gs_change+0xb/0xb
> [ 379.844794] INFO: lockdep is turned off.
Ditto here. rcun8 handles CPUs 128-143, which includes CPU 132. So we
have "rcun ffffffff82441300", which also was last seen "starting wait
for work". And therefore also was waiting TASK_INTERRUPTIBLE.
If I cannot think of anything better, I will send you a patch to the
"blocked for more than 120 seconds" code that dumps out the state of
the rcun kthreads.
Thanx, Paul
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