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Message-ID: <20140401233130.GA25030@redhat.com> Date: Tue, 1 Apr 2014 19:31:30 -0400 From: Dave Jones <davej@...hat.com> To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> Cc: Linux Kernel <linux-kernel@...r.kernel.org> Subject: Re: rcu_prempt stalls / lockup On Tue, Apr 01, 2014 at 04:18:22PM -0700, Paul E. McKenney wrote: > > # entries-in-buffer/entries-written: 7/7 #P:4 > > # > > # _-----=> irqs-off > > # / _----=> need-resched > > # | / _---=> hardirq/softirq > > # || / _--=> preempt-depth > > # ||| / delay > > # TASK-PID CPU# |||| TIMESTAMP FUNCTION > > # | | | |||| | | > > <idle>-0 [000] dNs3 851.748475: rcu_grace_period: rcu_preempt 21342 cpuend > > <idle>-0 [000] dNs3 851.748477: rcu_grace_period: rcu_preempt 21343 cpustart > > <idle>-0 [000] dNs3 851.748477: rcu_grace_period: rcu_sched 20080 cpuend > > <idle>-0 [000] dN.2 851.748480: rcu_grace_period: rcu_preempt 21343 cpuqs > > rcu_preempt-9 [000] ...1 851.748485: rcu_grace_period: rcu_preempt 21343 fqsstart > > rcu_preempt-9 [000] ...1 851.748487: rcu_grace_period: rcu_preempt 21343 fqsend > > rcu_preempt-9 [000] ...1 851.748487: rcu_grace_period: rcu_preempt 21343 fqswait > > # tracer: nop > > # > > # entries-in-buffer/entries-written: 13/13 #P:4 > > # > > # _-----=> irqs-off > > # / _----=> need-resched > > # | / _---=> hardirq/softirq > > # || / _--=> preempt-depth > > # ||| / delay > > # TASK-PID CPU# |||| TIMESTAMP FUNCTION > > # | | | |||| | | > > rcu_preempt-9 [003] d..2 851.878457: rcu_grace_period: rcu_preempt 21349 end > > rcu_preempt-9 [003] d..2 851.878459: rcu_grace_period: rcu_preempt 21349 newreq > > rcu_preempt-9 [003] ...1 851.878459: rcu_grace_period: rcu_preempt 21349 reqwait > > rcu_preempt-9 [003] d..2 851.878460: rcu_grace_period: rcu_preempt 21350 start > > rcu_preempt-9 [003] d..2 851.878461: rcu_grace_period: rcu_preempt 21350 cpustart > > rcu_preempt-9 [003] d..2 851.878462: rcu_grace_period_init: rcu_preempt 21350 0 0 7 f > > rcu_preempt-9 [003] ...1 851.878463: rcu_grace_period: rcu_preempt 21350 fqswait > > rcu_preempt-9 [003] d..2 851.878464: rcu_grace_period: rcu_preempt 21350 cpuqs > > <idle>-0 [000] dNs3 851.878482: rcu_grace_period: rcu_preempt 21349 cpuend > > <idle>-0 [000] dNs3 851.878483: rcu_grace_period: rcu_preempt 21350 cpustart > > <idle>-0 [000] dNs3 851.878484: rcu_grace_period: rcu_sched 20086 cpuend > > <idle>-0 [000] .N.2 851.878486: rcu_grace_period: rcu_sched 20086 cpuqs > > <idle>-0 [000] dN.2 851.878487: rcu_grace_period: rcu_preempt 21350 cpuqs > > > > > > followed by a half dozen 'empty' traces before it totally locked up. > > Cool, thank you! > > Could you please also send the RCU CPU stall warning messages? >From that run they were.. [ 917.790265] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 917.791189] (detected by 0, t=6502 jiffies, g=21390, c=21389, q=0) [ 917.792058] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 917.792799] INFO: rcu_sched detected stalls on CPUs/tasks: [ 917.793534] (detected by 0, t=6502 jiffies, g=20128, c=20127, q=0) [ 917.794265] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 1112.727480] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1112.728425] (detected by 0, t=26007 jiffies, g=21390, c=21389, q=0) [ 1112.729300] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 1112.730035] INFO: rcu_sched detected stalls on CPUs/tasks: [ 1112.730744] (detected by 0, t=26007 jiffies, g=20128, c=20127, q=0) [ 1112.731459] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 1307.664710] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1307.665623] (detected by 0, t=45512 jiffies, g=21390, c=21389, q=0) [ 1307.666386] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 1307.667113] INFO: rcu_sched detected stalls on CPUs/tasks: [ 1307.667839] (detected by 0, t=45512 jiffies, g=20128, c=20127, q=0) [ 1307.668572] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 1502.601961] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1502.602905] (detected by 0, t=65017 jiffies, g=21390, c=21389, q=0) [ 1502.603765] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 1502.604550] INFO: rcu_sched detected stalls on CPUs/tasks: [ 1502.605305] (detected by 0, t=65017 jiffies, g=20128, c=20127, q=0) [ 1502.606061] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 1697.539217] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1697.540189] (detected by 0, t=84522 jiffies, g=21390, c=21389, q=0) [ 1697.541052] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 1697.541826] INFO: rcu_sched detected stalls on CPUs/tasks: [ 1697.542600] (detected by 0, t=84522 jiffies, g=20128, c=20127, q=0) [ 1697.543378] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 1892.476433] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1892.477545] (detected by 0, t=104027 jiffies, g=21390, c=21389, q=0) [ 1892.478402] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 1892.479208] INFO: rcu_sched detected stalls on CPUs/tasks: [ 1892.480010] (detected by 0, t=104027 jiffies, g=20128, c=20127, q=0) [ 1892.480831] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 2087.413694] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 2087.414748] (detected by 0, t=123532 jiffies, g=21390, c=21389, q=0) [ 2087.415722] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 2087.416558] INFO: rcu_sched detected stalls on CPUs/tasks: [ 2087.417392] (detected by 0, t=123532 jiffies, g=20128, c=20127, q=0) [ 2087.418231] INFO: Stall ended before state dump start, gp_kthread state: 0x2 -- 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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