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Date: Thu, 7 May 2015 12:36:11 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Dave Jones <davej@...emonkey.org.uk>, Linux Kernel <linux-kernel@...r.kernel.org>, linux-ext4@...r.kernel.org Subject: Re: ext4_es_lookup_extent causing rcu stalls. On Thu, May 07, 2015 at 10:35:52AM -0400, Dave Jones wrote: > I got similar traces to these from the soft lockup detector until > I disabled it. It isn't so easy to disable RCU, so perhaps we could > do something more creative.. > > Traces from 4.1-rc2 > > Dave > > > INFO: rcu_sched self-detected stall on CPU > 5: (6499 ticks this GP) idle=861/140000000000001/0 softirq=18210/18210 fqs=6500 > (t=6500 jiffies g=57760 c=57759 q=0) > Task dump for CPU 5: > trinity-c1 R running task 13136 17998 31742 0x0048000c > 0000000000003350 00000000a3d4db28 ffff88043d943d58 ffffffffb30abd15 > ffffffffb30abc32 0000000000000005 0000000000000000 0000000000000005 > ffffffffb3c3b080 0000000000000082 ffff88043d943d78 ffffffffb30afaad > Call Trace: > <IRQ> [<ffffffffb30abd15>] sched_show_task+0x165/0x280 > [<ffffffffb30abc32>] ? sched_show_task+0x82/0x280 > [<ffffffffb30afaad>] dump_cpu_task+0x3d/0x50 > [<ffffffffb30e3af1>] rcu_dump_cpu_stacks+0x91/0xd0 > [<ffffffffb30ef21c>] rcu_check_callbacks+0x7ec/0xb30 > [<ffffffffb31080ae>] ? tick_do_update_jiffies64+0xde/0x140 > [<ffffffffb30f5389>] update_process_times+0x39/0x60 > [<ffffffffb3107ef5>] tick_sched_handle.isra.20+0x25/0x60 > [<ffffffffb3108191>] tick_sched_timer+0x41/0x80 > [<ffffffffb30f643a>] __run_hrtimer+0xba/0x5f0 > [<ffffffffb3108150>] ? tick_sched_do_timer+0x40/0x40 > [<ffffffffb30f6e93>] hrtimer_interrupt+0x103/0x230 > [<ffffffffb30b10e2>] ? vtime_common_account_irq_enter+0x32/0x50 > [<ffffffffb3034fec>] local_apic_timer_interrupt+0x3c/0x70 > [<ffffffffb372bf51>] smp_apic_timer_interrupt+0x41/0x60 > [<ffffffffb372a980>] apic_timer_interrupt+0x70/0x80 > <EOI> [<ffffffffb30d19aa>] ? do_raw_read_lock+0x1a/0x50 > [<ffffffffb37294a3>] _raw_read_lock+0x43/0x50 > [<ffffffffb329ee3e>] ? ext4_es_lookup_extent+0x5e/0x470 > [<ffffffffb329ee3e>] ext4_es_lookup_extent+0x5e/0x470 > [<ffffffffb32561eb>] ext4_map_blocks+0x5b/0x590 > [<ffffffffb329e81c>] ? ext4_es_find_delayed_extent_range+0x42c/0x480 > [<ffffffffb324f271>] ext4_llseek+0x271/0x410 > [<ffffffffb30cb0fd>] ? trace_hardirqs_on+0xd/0x10 > [<ffffffffb31cd339>] SyS_lseek+0x99/0xc0 > [<ffffffffb3729b97>] system_call_fastpath+0x12/0x6f > INFO: rcu_sched detected stalls on CPUs/tasks: > (detected by 0, t=6502 jiffies, g=75215, c=75214, q=0) > All QSes seen, last rcu_sched kthread activity 6502 (4295121467-4295114965), jiffies_till_next_fqs=1, root ->qsmask 0x0 > trinity-c21 R running task 12768 20468 30399 0x0008000c > 00000000000031e0 00000000f34c833f ffff88043d803da8 ffffffffb30abd15 > ffffffffb30abc32 ffffffffb3c3b500 0000000000001966 ffff88043d817580 > ffffffffb3c3b080 0000000000000000 ffff88043d803e28 ffffffffb30ef556 > Call Trace: > <IRQ> [<ffffffffb30abd15>] sched_show_task+0x165/0x280 > [<ffffffffb30abc32>] ? sched_show_task+0x82/0x280 > [<ffffffffb30ef556>] rcu_check_callbacks+0xb26/0xb30 > [<ffffffffb30f5389>] update_process_times+0x39/0x60 > [<ffffffffb3107ef5>] tick_sched_handle.isra.20+0x25/0x60 > [<ffffffffb3108191>] tick_sched_timer+0x41/0x80 > [<ffffffffb30f643a>] __run_hrtimer+0xba/0x5f0 > [<ffffffffb3108150>] ? tick_sched_do_timer+0x40/0x40 > [<ffffffffb30f6e93>] hrtimer_interrupt+0x103/0x230 > [<ffffffffb30b10e2>] ? vtime_common_account_irq_enter+0x32/0x50 > [<ffffffffb3034fec>] local_apic_timer_interrupt+0x3c/0x70 > [<ffffffffb372bf51>] smp_apic_timer_interrupt+0x41/0x60 > [<ffffffffb372a980>] apic_timer_interrupt+0x70/0x80 > <EOI> [<ffffffffb30cde67>] ? lock_acquire+0xd7/0x270 > [<ffffffffb329e466>] ? ext4_es_find_delayed_extent_range+0x76/0x480 > [<ffffffffb372949b>] _raw_read_lock+0x3b/0x50 > [<ffffffffb329e466>] ? ext4_es_find_delayed_extent_range+0x76/0x480 > [<ffffffffb329e466>] ext4_es_find_delayed_extent_range+0x76/0x480 > [<ffffffffb324f291>] ext4_llseek+0x291/0x410 > [<ffffffffb30cb0fd>] ? trace_hardirqs_on+0xd/0x10 > [<ffffffffb31cd339>] SyS_lseek+0x99/0xc0 > [<ffffffffb3729b97>] system_call_fastpath+0x12/0x6f > rcu_sched kthread starved for 6502 jiffies! If you don't let RCU's grace-period kthreads run, they aren't going to be able to help you much. Could you please try building with CONFIG_RCU_KTHREAD_PRIO=5 (say) and see if that helps? Thanx, Paul > INFO: rcu_sched detected stalls on CPUs/tasks: > (detected by 0, t=26007 jiffies, g=75215, c=75214, q=0) > All QSes seen, last rcu_sched kthread activity 26007 (4295140972-4295114965), jiffies_till_next_fqs=1, root ->qsmask 0x0 > trinity-c21 R running task 12768 20468 30399 0x0008000c > 00000000000031e0 00000000f34c833f ffff88043d803da8 ffffffffb30abd15 > ffffffffb30abc32 ffffffffb3c3b500 0000000000006597 ffff88043d817580 > ffffffffb3c3b080 0000000000000000 ffff88043d803e28 ffffffffb30ef556 > Call Trace: > <IRQ> [<ffffffffb30abd15>] sched_show_task+0x165/0x280 > [<ffffffffb30abc32>] ? sched_show_task+0x82/0x280 > [<ffffffffb30ef556>] rcu_check_callbacks+0xb26/0xb30 > [<ffffffffb30f5389>] update_process_times+0x39/0x60 > [<ffffffffb3107ef5>] tick_sched_handle.isra.20+0x25/0x60 > [<ffffffffb3108191>] tick_sched_timer+0x41/0x80 > [<ffffffffb30f643a>] __run_hrtimer+0xba/0x5f0 > [<ffffffffb3108150>] ? tick_sched_do_timer+0x40/0x40 > [<ffffffffb30f6e93>] hrtimer_interrupt+0x103/0x230 > [<ffffffffb30b10e2>] ? vtime_common_account_irq_enter+0x32/0x50 > [<ffffffffb3034fec>] local_apic_timer_interrupt+0x3c/0x70 > [<ffffffffb372bf51>] smp_apic_timer_interrupt+0x41/0x60 > [<ffffffffb372a980>] apic_timer_interrupt+0x70/0x80 > <EOI> [<ffffffffb30dfa5f>] ? debug_lockdep_rcu_enabled+0x2f/0x40 > [<ffffffffb329e6bd>] ext4_es_find_delayed_extent_range+0x2cd/0x480 > [<ffffffffb329e40a>] ? ext4_es_find_delayed_extent_range+0x1a/0x480 > [<ffffffffb324f291>] ext4_llseek+0x291/0x410 > [<ffffffffb30cb0fd>] ? trace_hardirqs_on+0xd/0x10 > [<ffffffffb31cd339>] SyS_lseek+0x99/0xc0 > [<ffffffffb3729b97>] system_call_fastpath+0x12/0x6f > rcu_sched kthread starved for 26007 jiffies! > > -- > 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/ > -- 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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