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Message-ID: <4DD574BE.7050709@kernel.org> Date: Thu, 19 May 2011 12:51:26 -0700 From: Yinghai Lu <yinghai@...nel.org> To: Frederic Weisbecker <fweisbec@...il.com> CC: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org> Subject: Re: [GIT PULL rcu/next] rcu commits for 2.6.40 On 05/19/2011 07:47 AM, Frederic Weisbecker wrote: > Can you please test the following branch? > > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git > rcu/debug > > It's Paul's branch + the early_initcall fix + the following patch: > > --- > commit 14667f347dea62d9e5a08e0f614840e50f73002c > Author: Frederic Weisbecker <fweisbec@...il.com> > Date: Thu May 19 16:25:19 2011 +0200 > > rcu: Trace dynticks internal values > > To debug some nasty count bug. > > Not-signed-off-by: Frederic Weisbecker <fweisbec@...il.com> [ 85.194251] ------------[ cut here ]------------ [ 85.194260] WARNING: at kernel/rcutree.c:353 rcu_enter_nohz+0x63/0xa5() [ 85.194262] Hardware name: Sun Fire X4800 M2 [ 85.194264] Modules linked in: [ 85.194268] Pid: 0, comm: swapper Tainted: G W 2.6.39-tip-yh-05046-g8a9149b-dirty #1021 [ 85.194270] Call Trace: [ 85.194291] [<ffffffff810800f4>] warn_slowpath_common+0x85/0x9d [ 85.194296] [<ffffffff81080126>] warn_slowpath_null+0x1a/0x1c [ 85.194301] [<ffffffff810d3326>] rcu_enter_nohz+0x63/0xa5 [ 85.194311] [<ffffffff810ab161>] tick_nohz_stop_sched_tick+0x27d/0x366 [ 85.194317] [<ffffffff810391bc>] cpu_idle+0x7a/0xcc [ 85.194326] [<ffffffff81bda823>] rest_init+0xb7/0xbe [ 85.194331] [<ffffffff81bda76c>] ? csum_partial_copy_generic+0x16c/0x16c [ 85.194338] [<ffffffff82742e39>] start_kernel+0x3b2/0x3bd [ 85.194344] [<ffffffff827422cc>] x86_64_start_reservations+0x9c/0xa0 [ 85.194348] [<ffffffff827424a8>] x86_64_start_kernel+0x1d8/0x1e3 [ 85.194351] ---[ end trace a7919e7f17c0a726 ]--- [ 85.194366] Dumping ftrace buffer: [ 85.194391] --------------------------------- [ 85.194415] CPU:0 [LOST 74512 EVENTS] [ 85.194416] <idle>-0 0d... 85121004us : <stack trace> [ 85.194418] => rcu_irq_enter [ 85.194418] => irq_enter [ 85.194419] => smp_apic_timer_interrupt [ 85.194420] => apic_timer_interrupt [ 85.194421] => cpu_idle [ 85.194421] => rest_init [ 85.194422] => start_kernel [ 85.194423] => x86_64_start_reservations [ 85.194430] <idle>-0 0d... 85121009us : rcu_irq_enter: 1 49 [ 85.194441] <idle>-0 0dN.. 85121429us : <stack trace> [ 85.194443] => rcu_irq_exit [ 85.194443] => irq_exit [ 85.194444] => smp_apic_timer_interrupt [ 85.194445] => apic_timer_interrupt [ 85.194446] => cpu_idle [ 85.194447] => rest_init [ 85.194447] => start_kernel [ 85.194448] => x86_64_start_reservations [ 85.194454] <idle>-0 0dN.. 85121433us : rcu_irq_exit: 1 4a [ 85.194465] <idle>-0 0d... 85124995us : <stack trace> [ 85.194466] => rcu_irq_enter [ 85.194467] => irq_enter [ 85.194468] => smp_apic_timer_interrupt [ 85.194469] => apic_timer_interrupt [ 85.194470] => cpu_idle [ 85.194470] => rest_init [ 85.194471] => start_kernel [ 85.194472] => x86_64_start_reservations [ 85.194477] <idle>-0 0d... 85125007us : rcu_irq_enter: 1 49 [ 85.194488] <idle>-0 0dN.. 85125366us : <stack trace> [ 85.194489] => rcu_irq_exit [ 85.194490] => irq_exit [ 85.194491] => smp_apic_timer_interrupt [ 85.194492] => apic_timer_interrupt [ 85.194492] => cpu_idle [ 85.194493] => rest_init [ 85.194494] => start_kernel [ 85.194494] => x86_64_start_reservations [ 85.194500] <idle>-0 0dN.. 85125371us : rcu_irq_exit: 1 4a [ 85.194511] <idle>-0 0d... 85128990us : <stack trace> [ 85.194512] => rcu_irq_enter [ 85.194513] => irq_enter [ 85.194514] => smp_apic_timer_interrupt [ 85.194514] => apic_timer_interrupt [ 85.194515] => cpu_idle [ 85.194516] => rest_init [ 85.194517] => start_kernel [ 85.194517] => x86_64_start_reservations [ 85.194523] <idle>-0 0d... 85129001us : rcu_irq_enter: 1 49 [ 85.194534] <idle>-0 0dN.. 85129033us : <stack trace> [ 85.194535] => rcu_irq_exit [ 85.194536] => irq_exit [ 85.194536] => smp_apic_timer_interrupt [ 85.194537] => apic_timer_interrupt [ 85.194538] => cpu_idle [ 85.194539] => rest_init [ 85.194539] => start_kernel [ 85.194540] => x86_64_start_reservations [ 85.194546] <idle>-0 0dN.. 85129043us : rcu_irq_exit: 1 4a [ 85.194556] <idle>-0 0d... 85132981us : <stack trace> [ 85.194558] => rcu_irq_enter [ 85.194558] => irq_enter [ 85.194559] => smp_apic_timer_interrupt [ 85.194560] => apic_timer_interrupt [ 85.194561] => cpu_idle [ 85.194561] => rest_init [ 85.194562] => start_kernel [ 85.194563] => x86_64_start_reservations [ 85.194568] <idle>-0 0d... 85132986us : rcu_irq_enter: 1 49 [ 85.194579] <idle>-0 0dN.. 85133066us : <stack trace> [ 85.194580] => rcu_irq_exit [ 85.194581] => irq_exit [ 85.194582] => smp_apic_timer_interrupt [ 85.194583] => apic_timer_interrupt [ 85.194583] => cpu_idle [ 85.194584] => rest_init [ 85.194585] => start_kernel [ 85.194586] => x86_64_start_reservations [ 85.194592] <idle>-0 0dN.. 85133077us : rcu_irq_exit: 1 4a [ 85.194602] <idle>-0 0d... 85136976us : <stack trace> [ 85.194604] => rcu_irq_enter [ 85.194604] => irq_enter [ 85.194605] => smp_apic_timer_interrupt [ 85.194606] => apic_timer_interrupt [ 85.194607] => cpu_idle [ 85.194608] => rest_init [ 85.194608] => start_kernel [ 85.194609] => x86_64_start_reservations [ 85.194615] <idle>-0 0d... 85136987us : rcu_irq_enter: 1 49 [ 85.194626] <idle>-0 0dN.. 85137062us : <stack trace> [ 85.194627] => rcu_irq_exit [ 85.194628] => irq_exit [ 85.194628] => smp_apic_timer_interrupt [ 85.194629] => apic_timer_interrupt [ 85.194630] => cpu_idle [ 85.194631] => rest_init [ 85.194631] => start_kernel [ 85.194632] => x86_64_start_reservations [ 85.194638] <idle>-0 0dN.. 85137072us : rcu_irq_exit: 1 4a [ 85.194649] <idle>-0 0d... 85140967us : <stack trace> [ 85.194650] => rcu_irq_enter [ 85.194651] => irq_enter [ 85.194651] => smp_apic_timer_interrupt [ 85.194652] => apic_timer_interrupt [ 85.194653] => cpu_idle [ 85.194653] => rest_init [ 85.194654] => start_kernel [ 85.194655] => x86_64_start_reservations [ 85.194661] <idle>-0 0d... 85140974us : rcu_irq_enter: 1 49 [ 85.194671] <idle>-0 0dN.. 85141463us : <stack trace> [ 85.194673] => rcu_irq_exit [ 85.194673] => irq_exit [ 85.194674] => smp_apic_timer_interrupt [ 85.194675] => apic_timer_interrupt [ 85.194676] => cpu_idle [ 85.194676] => rest_init [ 85.194677] => start_kernel [ 85.194678] => x86_64_start_reservations [ 85.194683] <idle>-0 0dN.. 85141467us : rcu_irq_exit: 1 4a [ 85.194694] <idle>-0 0d... 85144960us : <stack trace> [ 85.194695] => rcu_irq_enter [ 85.194696] => irq_enter [ 85.194697] => smp_apic_timer_interrupt [ 85.194698] => apic_timer_interrupt [ 85.194698] => cpu_idle [ 85.194699] => rest_init [ 85.194700] => start_kernel [ 85.194700] => x86_64_start_reservations [ 85.194706] <idle>-0 0d... 85144967us : rcu_irq_enter: 1 49 [ 85.194717] <idle>-0 0dN.. 85145234us : <stack trace> [ 85.194718] => rcu_irq_exit [ 85.194719] => irq_exit [ 85.194720] => smp_apic_timer_interrupt [ 85.194720] => apic_timer_interrupt [ 85.194721] => cpu_idle [ 85.194722] => rest_init [ 85.194722] => start_kernel [ 85.194723] => x86_64_start_reservations [ 85.194729] <idle>-0 0dN.. 85145238us : rcu_irq_exit: 1 4a [ 85.194740] <idle>-0 0d... 85148953us : <stack trace> [ 85.194741] => rcu_irq_enter [ 85.194742] => irq_enter [ 85.194742] => smp_apic_timer_interrupt [ 85.194743] => apic_timer_interrupt [ 85.194744] => cpu_idle [ 85.194744] => rest_init [ 85.194745] => start_kernel [ 85.194746] => x86_64_start_reservations [ 85.194752] <idle>-0 0d... 85148958us : rcu_irq_enter: 1 49 [ 85.194762] <idle>-0 0dN.. 85149096us : <stack trace> [ 85.194764] => rcu_irq_exit [ 85.194764] => irq_exit [ 85.194765] => smp_apic_timer_interrupt [ 85.194766] => apic_timer_interrupt [ 85.194767] => cpu_idle [ 85.194767] => rest_init [ 85.194768] => start_kernel [ 85.194769] => x86_64_start_reservations [ 85.194774] <idle>-0 0dN.. 85149101us : rcu_irq_exit: 1 4a [ 85.194785] <idle>-0 0d... 85152946us : <stack trace> [ 85.194786] => rcu_irq_enter [ 85.194787] => irq_enter [ 85.194788] => smp_apic_timer_interrupt [ 85.194789] => apic_timer_interrupt [ 85.194789] => cpu_idle [ 85.194790] => rest_init [ 85.194791] => start_kernel [ 85.194791] => x86_64_start_reservations [ 85.194797] <idle>-0 0d... 85152953us : rcu_irq_enter: 1 49 [ 85.194808] <idle>-0 0dN.. 85153081us : <stack trace> [ 85.194809] => rcu_irq_exit [ 85.194810] => irq_exit [ 85.194811] => smp_apic_timer_interrupt [ 85.194812] => apic_timer_interrupt [ 85.194813] => cpu_idle [ 85.194813] => rest_init [ 85.194814] => start_kernel [ 85.194815] => x86_64_start_reservations [ 85.194821] <idle>-0 0dN.. 85153085us : rcu_irq_exit: 1 4a [ 85.194832] <idle>-0 0d... 85156939us : <stack trace> [ 85.194833] => rcu_irq_enter [ 85.194834] => irq_enter [ 85.194834] => smp_apic_timer_interrupt [ 85.194835] => apic_timer_interrupt [ 85.194836] => cpu_idle [ 85.194837] => rest_init [ 85.194837] => start_kernel [ 85.194838] => x86_64_start_reservations [ 85.194844] <idle>-0 0d... 85156948us : rcu_irq_enter: 1 49 [ 85.194854] <idle>-0 0dN.. 85157535us : <stack trace> [ 85.194856] => rcu_irq_exit [ 85.194856] => irq_exit [ 85.194857] => smp_apic_timer_interrupt [ 85.194858] => apic_timer_interrupt [ 85.194859] => cpu_idle [ 85.194859] => rest_init [ 85.194860] => start_kernel [ 85.194861] => x86_64_start_reservations [ 85.194866] <idle>-0 0dN.. 85157540us : rcu_irq_exit: 1 4a [ 85.194877] <idle>-0 0d... 85160932us : <stack trace> [ 85.194878] => rcu_irq_enter [ 85.194879] => irq_enter [ 85.194880] => smp_apic_timer_interrupt [ 85.194881] => apic_timer_interrupt [ 85.194881] => cpu_idle [ 85.194882] => rest_init [ 85.194883] => start_kernel [ 85.194883] => x86_64_start_reservations [ 85.194889] <idle>-0 0d... 85160941us : rcu_irq_enter: 1 49 [ 85.194900] <idle>-0 0dN.. 85161127us : <stack trace> [ 85.194901] => rcu_irq_exit [ 85.194902] => irq_exit [ 85.194903] => smp_apic_timer_interrupt [ 85.194903] => apic_timer_interrupt [ 85.194904] => cpu_idle [ 85.194905] => rest_init [ 85.194905] => start_kernel [ 85.194906] => x86_64_start_reservations [ 85.194912] <idle>-0 0dN.. 85161132us : rcu_irq_exit: 1 4a [ 85.194923] <idle>-0 0d... 85164925us : <stack trace> [ 85.194924] => rcu_irq_enter [ 85.194925] => irq_enter [ 85.194925] => smp_apic_timer_interrupt [ 85.194926] => apic_timer_interrupt [ 85.194927] => cpu_idle [ 85.194928] => rest_init [ 85.194928] => start_kernel [ 85.194929] => x86_64_start_reservations [ 85.194935] <idle>-0 0d... 85164930us : rcu_irq_enter: 1 49 [ 85.194945] <idle>-0 0dN.. 85165009us : <stack trace> [ 85.194947] => rcu_irq_exit [ 85.194947] => irq_exit [ 85.194948] => smp_apic_timer_interrupt [ 85.194949] => apic_timer_interrupt [ 85.194950] => cpu_idle [ 85.194950] => rest_init [ 85.194951] => start_kernel [ 85.194952] => x86_64_start_reservations [ 85.194957] <idle>-0 0dN.. 85165013us : rcu_irq_exit: 1 4a [ 85.194968] <idle>-0 0d... 85168920us : <stack trace> [ 85.194969] => rcu_irq_enter [ 85.194970] => irq_enter [ 85.194971] => smp_apic_timer_interrupt [ 85.194972] => apic_timer_interrupt [ 85.194972] => cpu_idle [ 85.194973] => rest_init [ 85.194974] => start_kernel [ 85.194974] => x86_64_start_reservations [ 85.194980] <idle>-0 0d... 85168931us : rcu_irq_enter: 1 49 [ 85.194991] <idle>-0 0dN.. 85168970us : <stack trace> [ 85.194992] => rcu_irq_exit [ 85.194993] => irq_exit [ 85.194993] => smp_apic_timer_interrupt [ 85.194994] => apic_timer_interrupt [ 85.194995] => cpu_idle [ 85.194996] => rest_init [ 85.194996] => start_kernel [ 85.194997] => x86_64_start_reservations [ 85.195003] <idle>-0 0dN.. 85168980us : rcu_irq_exit: 1 4a [ 85.195014] <idle>-0 0d... 85172911us : <stack trace> [ 85.195015] => rcu_irq_enter [ 85.195016] => irq_enter [ 85.195016] => smp_apic_timer_interrupt [ 85.195017] => apic_timer_interrupt [ 85.195018] => cpu_idle [ 85.195019] => rest_init [ 85.195020] => start_kernel [ 85.195020] => x86_64_start_reservations [ 85.195026] <idle>-0 0d... 85172916us : rcu_irq_enter: 1 49 [ 85.195037] <idle>-0 0dN.. 85173155us : <stack trace> [ 85.195038] => rcu_irq_exit [ 85.195039] => irq_exit [ 85.195040] => smp_apic_timer_interrupt [ 85.195041] => apic_timer_interrupt [ 85.195042] => cpu_idle [ 85.195042] => rest_init [ 85.195043] => start_kernel [ 85.195044] => x86_64_start_reservations [ 85.195050] <idle>-0 0dN.. 85173160us : rcu_irq_exit: 1 4a [ 85.195060] <idle>-0 0d... 85176904us : <stack trace> [ 85.195061] => rcu_irq_enter [ 85.195062] => irq_enter [ 85.195063] => smp_apic_timer_interrupt [ 85.195064] => apic_timer_interrupt [ 85.195064] => cpu_idle [ 85.195065] => rest_init [ 85.195066] => start_kernel [ 85.195066] => x86_64_start_reservations [ 85.195072] <idle>-0 0d... 85176913us : rcu_irq_enter: 1 49 [ 85.195083] <idle>-0 0dN.. 85177864us : <stack trace> [ 85.195084] => rcu_irq_exit [ 85.195085] => irq_exit [ 85.195086] => smp_apic_timer_interrupt [ 85.195086] => apic_timer_interrupt [ 85.195087] => cpu_idle [ 85.195088] => rest_init [ 85.195088] => start_kernel [ 85.195089] => x86_64_start_reservations [ 85.195095] <idle>-0 0dN.. 85177869us : rcu_irq_exit: 1 4a [ 85.195106] <idle>-0 0d... 85180897us : <stack trace> [ 85.195107] => rcu_irq_enter [ 85.195108] => irq_enter [ 85.195108] => smp_apic_timer_interrupt [ 85.195109] => apic_timer_interrupt [ 85.195110] => cpu_idle [ 85.195111] => rest_init [ 85.195111] => start_kernel [ 85.195112] => x86_64_start_reservations [ 85.195118] <idle>-0 0d... 85180907us : rcu_irq_enter: 1 49 [ 85.195129] <idle>-0 0dN.. 85181665us : <stack trace> [ 85.195130] => rcu_irq_exit [ 85.195130] => irq_exit [ 85.195131] => smp_apic_timer_interrupt [ 85.195132] => apic_timer_interrupt [ 85.195133] => cpu_idle [ 85.195133] => rest_init [ 85.195134] => start_kernel [ 85.195135] => x86_64_start_reservations [ 85.195141] <idle>-0 0dN.. 85181669us : rcu_irq_exit: 1 4a [ 85.195152] <idle>-0 0d... 85184890us : <stack trace> [ 85.195153] => rcu_irq_enter [ 85.195154] => irq_enter [ 85.195154] => smp_apic_timer_interrupt [ 85.195155] => apic_timer_interrupt [ 85.195156] => cpu_idle [ 85.195157] => rest_init [ 85.195157] => start_kernel [ 85.195158] => x86_64_start_reservations [ 85.195164] <idle>-0 0d... 85184895us : rcu_irq_enter: 1 49 [ 85.195175] <idle>-0 0dN.. 85185146us : <stack trace> [ 85.195176] => rcu_irq_exit [ 85.195177] => irq_exit [ 85.195177] => smp_apic_timer_interrupt [ 85.195178] => apic_timer_interrupt [ 85.195179] => cpu_idle [ 85.195179] => rest_init [ 85.195180] => start_kernel [ 85.195181] => x86_64_start_reservations [ 85.195187] <idle>-0 0dN.. 85185151us : rcu_irq_exit: 1 4a [ 85.195203] <...>-6 0d... 85188881us : <stack trace> [ 85.195204] => rcu_irq_enter [ 85.195205] => irq_enter [ 85.195206] => smp_apic_timer_interrupt [ 85.195206] => apic_timer_interrupt [ 85.195207] => cpu_stopper_thread [ 85.195208] => kthread [ 85.195209] => kernel_thread_helper [ 85.195215] <...>-6 0d... 85188894us : rcu_irq_enter: 1 49 [ 85.195225] <...>-6 0d... 85188982us : <stack trace> [ 85.195226] => rcu_irq_exit [ 85.195227] => irq_exit [ 85.195228] => smp_apic_timer_interrupt [ 85.195229] => apic_timer_interrupt [ 85.195230] => cpu_stopper_thread [ 85.195231] => kthread [ 85.195231] => kernel_thread_helper [ 85.195237] <...>-6 0d... 85188989us : rcu_irq_exit: 1 4a [ 85.195249] <idle>-0 0d... 85190288us : <stack trace> [ 85.195250] => rcu_irq_enter [ 85.195251] => irq_enter [ 85.195251] => do_IRQ [ 85.195252] => ret_from_intr [ 85.195253] => cpu_idle [ 85.195253] => rest_init [ 85.195254] => start_kernel [ 85.195255] => x86_64_start_reservations [ 85.195261] <idle>-0 0d... 85190299us : rcu_irq_enter: 1 49 [ 85.195271] <idle>-0 0d... 85190336us : <stack trace> [ 85.195272] => rcu_irq_exit [ 85.195273] => irq_exit [ 85.195274] => do_IRQ [ 85.195274] => ret_from_intr [ 85.195275] => cpu_idle [ 85.195276] => rest_init [ 85.195276] => start_kernel [ 85.195277] => x86_64_start_reservations [ 85.195283] <idle>-0 0d... 85190346us : rcu_irq_exit: 1 4a [ 85.195293] <idle>-0 0d... 85192902us : <stack trace> [ 85.195295] => rcu_irq_enter [ 85.195295] => irq_enter [ 85.195296] => smp_apic_timer_interrupt [ 85.195297] => apic_timer_interrupt [ 85.195298] => cpu_idle [ 85.195298] => rest_init [ 85.195299] => start_kernel [ 85.195300] => x86_64_start_reservations [ 85.195305] <idle>-0 0d... 85193714us : rcu_irq_enter: 1 49 [ 85.195316] <idle>-0 0dN.. 85193856us : <stack trace> [ 85.195317] => rcu_irq_exit [ 85.195318] => irq_exit [ 85.195319] => smp_apic_timer_interrupt [ 85.195320] => apic_timer_interrupt [ 85.195320] => cpu_idle [ 85.195321] => rest_init [ 85.195322] => start_kernel [ 85.195322] => x86_64_start_reservations [ 85.195328] <idle>-0 0dN.. 85194210us : rcu_irq_exit: 1 4a [ 85.195338] <idle>-0 0d... 85194247us : <stack trace> [ 85.195340] => rcu_enter_nohz [ 85.195340] => tick_nohz_stop_sched_tick [ 85.195341] => cpu_idle [ 85.195342] => rest_init [ 85.195342] => start_kernel [ 85.195343] => x86_64_start_reservations [ 85.195344] => x86_64_start_kernel [ 85.195350] <idle>-0 0d... 85194250us : rcu_enter_nohz: 1 49 [ 85.195352] --------------------------------- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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