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Message-ID: <20070526161645.GA11760@vanheusden.com> Date: Sat, 26 May 2007 18:17:00 +0200 From: Folkert van Heusden <folkert@...heusden.com> To: Thomas Gleixner <tglx@...utronix.de> Cc: Parag Warudkar <parag.warudkar@...il.com>, linux-kernel@...r.kernel.org Subject: Re: [2.6.21.1] soft lockup when removing netconsole module > > Seems to be hrtimers related - CC'ed Thomas. > I doubt that. The tick interrupt just finds out, that the machine is > stuck in rmmod. > > > Also the rmmod hangs and would not exit even with kill -9. It also > > > sucks up 100% cpu. > Can you please enable CONFIG_PROVE_LOCKING ? Luckily I already had :-) Here is its output: [ 44.500182] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar [ 44.500228] ... MAX_LOCKDEP_SUBCLASSES: 8 [ 44.500266] ... MAX_LOCK_DEPTH: 30 [ 44.500305] ... MAX_LOCKDEP_KEYS: 2048 [ 44.500343] ... CLASSHASH_SIZE: 1024 [ 44.500383] ... MAX_LOCKDEP_ENTRIES: 8192 [ 44.500421] ... MAX_LOCKDEP_CHAINS: 16384 [ 44.500459] ... CHAINHASH_SIZE: 8192 [ 44.500498] memory used by lock dependency info: 1096 kB [ 44.500537] per task-struct memory footprint: 1200 bytes [ 44.500576] ------------------------ [ 44.500614] | Locking API testsuite: [ 44.500651] ---------------------------------------------------------------------------- [ 44.500697] | spin |wlock |rlock |mutex | wsem | rsem | [ 44.500743] -------------------------------------------------------------------------- [ 44.500794] A-A deadlock: ok | ok | ok | ok | ok | ok | [ 44.501739] A-B-B-A deadlock: ok | ok | ok | ok | ok | ok | [ 44.502675] A-B-B-C-C-A deadlock: ok | ok | ok | ok | ok | ok | [ 44.503617] A-B-C-A-B-C deadlock: ok | ok | ok | ok | ok | ok | [ 44.504557] A-B-B-C-C-D-D-A deadlock: ok | ok | ok | ok | ok | ok | [ 44.505509] A-B-C-D-B-D-D-A deadlock: ok | ok | ok | ok | ok | ok | [ 44.506469] A-B-C-D-B-C-D-A deadlock: ok | ok | ok | ok | ok | ok | [ 44.507424] double unlock: ok | ok | ok | ok | ok | ok | [ 44.508327] initialize held: ok | ok | ok | ok | ok | ok | [ 44.509245] bad unlock order: ok | ok | ok | ok | ok | ok | [ 44.510197] -------------------------------------------------------------------------- [ 44.510243] recursive read-lock: | ok | | ok | [ 44.510656] recursive read-lock #2: | ok | | ok | [ 44.511069] mixed read-write-lock: | ok | | ok | [ 44.511507] mixed write-read-lock: | ok | | ok | [ 44.511968] -------------------------------------------------------------------------- [ 44.512015] hard-irqs-on + irq-safe-A/12: ok | ok | ok | [ 44.512501] soft-irqs-on + irq-safe-A/12: ok | ok | ok | [ 44.512998] hard-irqs-on + irq-safe-A/21: ok | ok | ok | [ 44.513484] soft-irqs-on + irq-safe-A/21: ok | ok | ok | [ 44.513970] sirq-safe-A => hirqs-on/12: ok | ok | ok | [ 44.514456] sirq-safe-A => hirqs-on/21: ok | ok | ok | [ 44.514941] hard-safe-A + irqs-on/12: ok | ok | ok | [ 44.515425] soft-safe-A + irqs-on/12: ok | ok | ok | [ 44.515910] hard-safe-A + irqs-on/21: ok | ok | ok | [ 44.516396] soft-safe-A + irqs-on/21: ok | ok | ok | [ 44.516882] hard-safe-A + unsafe-B #1/123: ok | ok | ok | [ 44.517380] soft-safe-A + unsafe-B #1/123: ok | ok | ok | [ 44.517924] hard-safe-A + unsafe-B #1/132: ok | ok | ok | [ 44.518417] soft-safe-A + unsafe-B #1/132: ok | ok | ok | [ 44.518909] hard-safe-A + unsafe-B #1/213: ok | ok | ok | [ 44.519402] soft-safe-A + unsafe-B #1/213: ok | ok | ok | [ 44.519896] hard-safe-A + unsafe-B #1/231: ok | ok | ok | [ 44.520388] soft-safe-A + unsafe-B #1/231: ok | ok | ok | [ 44.520881] hard-safe-A + unsafe-B #1/312: ok | ok | ok | [ 44.521388] soft-safe-A + unsafe-B #1/312: ok | ok | ok | [ 44.521886] hard-safe-A + unsafe-B #1/321: ok | ok | ok | [ 44.522389] soft-safe-A + unsafe-B #1/321: ok | ok | ok | [ 44.522907] hard-safe-A + unsafe-B #2/123: ok | ok | ok | [ 44.523402] soft-safe-A + unsafe-B #2/123: ok | ok | ok | [ 44.523894] hard-safe-A + unsafe-B #2/132: ok | ok | ok | [ 44.524387] soft-safe-A + unsafe-B #2/132: ok | ok | ok | [ 44.524880] hard-safe-A + unsafe-B #2/213: ok | ok | ok | [ 44.525373] soft-safe-A + unsafe-B #2/213: ok | ok | ok | [ 44.525866] hard-safe-A + unsafe-B #2/231: ok | ok | ok | [ 44.526359] soft-safe-A + unsafe-B #2/231: ok | ok | ok | [ 44.526850] hard-safe-A + unsafe-B #2/312: ok | ok | ok | [ 44.527342] soft-safe-A + unsafe-B #2/312: ok | ok | ok | [ 44.527842] hard-safe-A + unsafe-B #2/321: ok | ok | ok | [ 44.528382] soft-safe-A + unsafe-B #2/321: ok | ok | ok | [ 44.529025] hard-irq lock-inversion/123: ok | ok | ok | [ 44.529516] soft-irq lock-inversion/123: ok | ok | ok | [ 44.530010] hard-irq lock-inversion/132: ok | ok | ok | [ 44.530501] soft-irq lock-inversion/132: ok | ok | ok | [ 44.530995] hard-irq lock-inversion/213: ok | ok | ok | [ 44.531488] soft-irq lock-inversion/213: ok | ok | ok | [ 44.531980] hard-irq lock-inversion/231: ok | ok | ok | [ 44.532470] soft-irq lock-inversion/231: ok | ok | ok | [ 44.532962] hard-irq lock-inversion/312: ok | ok | ok | [ 44.533478] soft-irq lock-inversion/312: ok | ok | ok | [ 44.533998] hard-irq lock-inversion/321: ok | ok | ok | [ 44.534515] soft-irq lock-inversion/321: ok | ok | ok | [ 44.535017] hard-irq read-recursion/123: ok | [ 44.535227] soft-irq read-recursion/123: ok | [ 44.535440] hard-irq read-recursion/132: ok | [ 44.535652] soft-irq read-recursion/132: ok | [ 44.535865] hard-irq read-recursion/213: ok | [ 44.536079] soft-irq read-recursion/213: ok | [ 44.536291] hard-irq read-recursion/231: ok | [ 44.536504] soft-irq read-recursion/231: ok | [ 44.536742] hard-irq read-recursion/312: ok | [ 44.536979] soft-irq read-recursion/312: ok | [ 44.537216] hard-irq read-recursion/321: ok | [ 44.537454] soft-irq read-recursion/321: ok | [ 44.537693] ------------------------------------------------------- [ 44.537733] Good, all 218 testcases passed! | [ 44.537774] --------------------------------- Folkert van Heusden -- MultiTail ist eine flexible Applikation um Logfiles und Kommando Eingaben zu überprüfen. Inkl. Filter, Farben, Zusammenführen, Ansichten etc. http://www.vanheusden.com/multitail/ ---------------------------------------------------------------------- Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com - 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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