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Subject[SCHED] rcu_sched kthread starved for N jiffies! + stack trace
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Dear All,

I did some soak testing of our application (running on linux) over the weekend. Our application runs on a dedicated linux system.
This morning, I saw in "/var/log/message" the following message repeated 70 times "rcu_sched kthread starved for N jiffies!" (N being a number in the tens of thousands). It also comes with a stack trace. Please find a copy/paste of the latest error message below.

For information, we are using SCHED_FIFO for some threads that needs to run with very low-latency (video card captures).

If anyone could shed some light on what that means, that would be greatly appreciated!

Many thanks,

Fabrice Triboix


ftenc:~# grep kernel /var/log/messages | tail -30
Nov 30 09:13:33 plink-buildroot user.warn kernel: [332879.369148] [<ffffffff81887e0f>] apic_timer_interrupt+0x6f/0x80
Nov 30 09:13:33 plink-buildroot user.warn kernel: [332879.369149] <EOI> [<ffffffff81887b42>] ? retint_restore_args+0xe/0xe
Nov 30 09:13:33 plink-buildroot user.warn kernel: [332879.369154] [<ffffffff8100cae5>] ? default_idle+0x25/0xb0
Nov 30 09:13:33 plink-buildroot user.warn kernel: [332879.369156] [<ffffffff8100cae3>] ? default_idle+0x23/0xb0
Nov 30 09:13:33 plink-buildroot user.warn kernel: [332879.369158] [<ffffffff8100d42f>] arch_cpu_idle+0xf/0x20
Nov 30 09:13:33 plink-buildroot user.warn kernel: [332879.369162] [<ffffffff810f64a5>] cpu_startup_entry+0x2e5/0x400
Nov 30 09:13:33 plink-buildroot user.warn kernel: [332879.369164] [<ffffffff81127103>] ? clockevents_register_device+0xe3/0x140
Nov 30 09:13:33 plink-buildroot user.warn kernel: [332879.369167] [<ffffffff8112718c>] ? clockevents_config_and_register+0x2c/0x40
Nov 30 09:13:33 plink-buildroot user.warn kernel: [332879.369169] [<ffffffff8103448a>] start_secondary+0x13a/0x150
Nov 30 09:13:33 plink-buildroot user.err kernel: [332879.369171] rcu_sched kthread starved for 20999 jiffies!
Nov 30 09:32:14 plink-buildroot user.err kernel: [334000.974890] INFO: rcu_sched detected stalls on CPUs/tasks: {} (detected by 5, t=21002 jiffies, g=6612437, c=6612436, q=11267)
Nov 30 09:32:14 plink-buildroot user.err kernel: [334000.974900] All QSes seen, last rcu_sched kthread activity 20999 (4628342351-4628321352), jiffies_till_next_fqs=3
Nov 30 09:32:14 plink-buildroot user.info kernel: [334000.974903] mux-0 R running task 0 10129 8797 0x00000000
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974907] ffffffff81e4c3c0 ffff88089fc83dd8 ffffffff810e53ef ffff88089fc943c0
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974909] ffffffff81e4c3c0 ffff88089fc83e48 ffffffff811157cc ffff880837edbf00
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974911] ffff88089fc943c0 0000000000002c03 000000000064e5d5 0000000000000000
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974914] Call Trace:
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974916] <IRQ> [<ffffffff810e53ef>] sched_show_task+0xaf/0x120
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974934] [<ffffffff811157cc>] rcu_check_callbacks+0x70c/0x780
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974937] [<ffffffff8111a5e9>] update_process_times+0x39/0x60
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974942] [<ffffffff811296f6>] tick_sched_handle.isra.16+0x36/0x50
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974945] [<ffffffff81129754>] tick_sched_timer+0x44/0x80
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974947] [<ffffffff8111b2f0>] __run_hrtimer+0x80/0x1c0
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974950] [<ffffffff81129710>] ? tick_sched_handle.isra.16+0x50/0x50
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974952] [<ffffffff8111b693>] hrtimer_interrupt+0xf3/0x210
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974958] [<ffffffff81035c99>] local_apic_timer_interrupt+0x39/0x60
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974964] [<ffffffff81889a25>] smp_apic_timer_interrupt+0x45/0x60
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974967] [<ffffffff81887e0f>] apic_timer_interrupt+0x6f/0x80
Nov 30 09:32:14 plink-buildroot user.warn kernel: [334000.974968] <EOI> [<ffffffff81887abe>] ? retint_swapgs+0xe/0x44
Nov 30 09:32:14 plink-buildroot user.err kernel: [334000.974971] rcu_sched kthread starved for 20999 jiffies!
ftenc:~#
ftenc:~#
ftenc:~# uname -a
Linux plink-buildroot 4.0.0 #2 SMP Thu Nov 26 10:34:48 GMT 2015 x86_64 GNU/Linux



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