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Date: Fri, 10 Apr 2009 17:48:13 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Al Viro <viro@...IV.linux.org.uk> Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>, linux-kernel@...r.kernel.org, hugh@...itas.com, jmorris@...ei.org, akpm@...ux-foundation.org Subject: Re: [2.6.30-rc1] RCU detected CPU 1 stall On Sat, Apr 11, 2009 at 12:39:20AM +0100, Al Viro wrote: > On Fri, Apr 10, 2009 at 04:12:45PM -0700, Paul E. McKenney wrote: > > On Sat, Apr 11, 2009 at 06:08:54AM +0900, Tetsuo Handa wrote: > > > Hello. > > > > > > Paul E. McKenney wrote: > > > > Tetsuo, how many tasks did you have on this machine? > > > I didn't count how many tasks were running on this machine. > > > But the number of tasks should be very low, for this happened during > > > the boot stage of Debian Sarge. > > > > > > 30 seconds ago from the first stalled message > > > > > > [ 41.415158] INFO: RCU detected CPU 1 stall (t=4294902646/2500 jiffies) > > > [ 41.417332] Pid: 3487, comm: khelper Tainted: G W 2.6.30-rc1 #1 > > > [ 41.417332] Call Trace: > > > > > > the system was doing > > > > > > [ 10.555521] kjournald starting. Commit interval 5 seconds > > > [ 10.556727] EXT3 FS on sdb1, internal journal > > > [ 10.556727] EXT3-fs: recovery complete. > > > [ 10.557585] EXT3-fs: mounted filesystem with writeback data mode. > > > /dev/sdb1 on /usr/src/all type ext3 (rw,noatime,nodiratime) > > > Detecting hardware: agpgart pcnet32 piix BusLogic ide_scsi > > > Skipping unavailable/built-in agpgart module. > > > pcnet32 disabled in configuration. > > > Skipping unavailable/built-in piix module. > > > Skipping unavailable/built-in BusLogic module. > > > Skipping unavailable/built-in ide_scsi module. > > > Running 0dns-down to make sure resolv.conf is ok...done. > > > Setting up networking...done. > > > Starting hotplug subsystem: > > > pci > > > ignoring pci display device 00:0f.0 > > > [ 16.727603] ------------[ cut here ]------------ > > > [ 16.729910] WARNING: at security/security.c:217 security_vm_enough_memory+0xa0/0xb0() > > > > > > > Though I too find it hard to believe that there were enough to chew up > > > > two minutes. Maybe the list got corrupted so that it has a loop? > > > > > > I powered off the machine after two minutes, for I thought the loop > > > was infinite. > > > > Is this reproducible? If so, any chance you could try bisecting? > > If that's execve() hang, we probably have something->fs->lock stuck. > I don't see any likely candidates, but... > > I'd really love to see results of repeated alt-sysrq-p/alt-sysrq-l, just > to see where was it actually spinning. Even better!!! ;-) Thanx, Paul -- 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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