Ok, thank you for your answer . Micka,
Le mar. 1 mars 2016 à 09:08, John Syne <[email protected]> a écrit : > Best to read this article to understand why this happens. My guess is your > app is probably starving the kernel of time to run its other functions and > hence you get this warning. Most likely you are disabling interrupts for > extended periods of time. Running multiple threads, each running every 5ms > is not a good idea considering the thread switching time. > > Regards, > John > > > > > On Feb 29, 2016, at 11:58 PM, Micka <[email protected]> wrote: > > But the CPU is stuck for 90 second, is that normal ? > > Micka, > > Le mar. 1 mars 2016 à 08:56, John Syne <[email protected]> a écrit : > >> It is not a bug. >> >> https://www.kernel.org/doc/Documentation/RCU/stallwarn.txt >> >> Regards, >> John >> >> >> >> >> On Feb 29, 2016, at 11:15 PM, Micka <[email protected]> wrote: >> >> Hi, >> >> I run 3 process doing serial test ( write on ttyO with a 5ms sleep >> between each send ) and i got this yesterday : >> >> [28744.255809] INFO: rcu_preempt self-detected stall on CPU >> [28744.255852] 0: (1 ticks this GP) idle=af5/1/0 softirq=1389832/1389832 >> fqs=0 >> [28744.255862] (t=9593 jiffies g=880748 c=880747 q=3814) >> [28744.255874] rcu_preempt kthread starved for 9593 jiffies! >> [28744.255881] Task dump for CPU 0: >> [28744.255889] swapper R running 0 0 0 0x00000002 >> [28744.255962] [<c0013139>] (unwind_backtrace) from [<c0011235>] >> (show_stack+0x11/0x14) >> [28744.255990] [<c0011235>] (show_stack) from [<c00653bb>] >> (rcu_dump_cpu_stacks+0x6b/0xac) >> [28744.256011] [<c00653bb>] (rcu_dump_cpu_stacks) from [<c0067bd3>] >> (rcu_check_callbacks+0x3fb/0x704) >> [28744.256030] [<c0067bd3>] (rcu_check_callbacks) from [<c006b447>] >> (update_process_times+0x2f/0x54) >> [28744.256051] [<c006b447>] (update_process_times) from [<c0076955>] >> (tick_sched_handle+0x21/0x4c) >> [28744.256065] [<c0076955>] (tick_sched_handle) from [<c00769bf>] >> (tick_sched_timer+0x3f/0x68) >> [28744.256078] [<c00769bf>] (tick_sched_timer) from [<c006be45>] >> (__run_hrtimer+0x61/0x1e0) >> [28744.256090] [<c006be45>] (__run_hrtimer) from [<c006c237>] >> (hrtimer_interrupt+0xcb/0x220) >> [28744.256109] [<c006c237>] (hrtimer_interrupt) from [<c0021f67>] >> (omap2_gp_timer_interrupt+0x23/0x28) >> [28744.256136] [<c0021f67>] (omap2_gp_timer_interrupt) from [<c006010f>] >> (handle_irq_event_percpu+0x5b/0x174) >> [28744.256151] [<c006010f>] (handle_irq_event_percpu) from [<c0060261>] >> (handle_irq_event+0x39/0x58) >> [28744.256168] [<c0060261>] (handle_irq_event) from [<c0061f1f>] >> (handle_level_irq+0x8b/0xd8) >> [28744.256183] [<c0061f1f>] (handle_level_irq) from [<c005fa7f>] >> (generic_handle_irq+0x23/0x2c) >> [28744.256195] [<c005fa7f>] (generic_handle_irq) from [<c005fc33>] >> (__handle_domain_irq+0x57/0xac) >> [28744.256208] [<c005fc33>] (__handle_domain_irq) from [<c0009349>] >> (omap_intc_handle_irq+0x85/0x8c) >> [28744.256236] [<c0009349>] (omap_intc_handle_irq) from [<c063d39b>] >> (__irq_svc+0x3b/0x80) >> [28744.256245] Exception stack(0xc0a4ff50 to 0xc0a4ff98) >> [28744.256255] ff40: 00000001 >> 00000000 00000000 c001c041 >> [28744.256265] ff60: c0a4e000 c0a510f8 00000000 00000000 c0b01a48 >> 00000001 c0aebb70 c0a51104 >> [28744.256275] ff80: c0a4e03c c0a4ff98 c000efff c000f000 40000033 ffffffff >> [28744.256294] [<c063d39b>] (__irq_svc) from [<c000f000>] >> (arch_cpu_idle+0x28/0x2c) >> [28744.256314] [<c000f000>] (arch_cpu_idle) from [<c004f189>] >> (cpu_startup_entry+0x1e1/0x248) >> [28744.256346] [<c004f189>] (cpu_startup_entry) from [<c09dea57>] >> (start_kernel+0x33f/0x348) >> [28744.256441] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 90s! >> [swapper:0] >> [28744.256450] Modules linked in: tda998x usb_f_acm u_serial usb_f_rndis >> g_multi usb_f_mass_storage u_ether libcomposite ti_am335x_adc rtc_ds1307 >> tmp102 mma8452 snd_soc_tlv320aic3x snd_soc_davinci_mcasp snd_soc_edma >> snd_soc_omap snd_soc_core ad799x industrialio_triggered_buffer kfifo_buf >> snd_compress snd_pcm_dmaengine industrialio gpio_mcp23s08 snd_pcm snd_seq >> snd_seq_device uio_pruss tilcdc snd_timer omap_aes omap_sham omap_rng >> drm_kms_helper rng_core snd spi_omap2_mcspi ti_am335x_tsc soundcore >> ti_am335x_tscadc uio_pdrv_genirq leds_gpio uio >> [28744.256588] CPU: 0 PID: 0 Comm: swapper Not tainted 4.1.16-bone18 #26 >> [28744.256594] Hardware name: Generic AM33XX (Flattened Device Tree) >> [28744.256603] task: c0a552f0 ti: c0a4e000 task.ti: c0a4e000 >> [28744.256615] PC is at arch_cpu_idle+0x28/0x2c >> [28744.256624] LR is at arch_cpu_idle+0x27/0x2c >> [28744.256633] pc : [<c000f000>] lr : [<c000efff>] psr: 40000033 >> [28744.256633] sp : c0a4ff98 ip : c0a4e03c fp : c0a51104 >> [28744.256642] r10: c0aebb70 r9 : 00000001 r8 : c0b01a48 >> [28744.256649] r7 : 00000000 r6 : 00000000 r5 : c0a510f8 r4 : c0a4e000 >> [28744.256657] r3 : c001c041 r2 : 00000000 r1 : 00000000 r0 : 00000001 >> [28744.256667] Flags: nZcv IRQs on FIQs on Mode SVC_32 ISA Thumb >> Segment kernel >> [28744.256675] Control: 50c5387d Table: 9deb0019 DAC: 00000015 >> [28744.256684] CPU: 0 PID: 0 Comm: swapper Not tainted 4.1.16-bone18 #26 >> [28744.256690] Hardware name: Generic AM33XX (Flattened Device Tree) >> [28744.256707] [<c0013139>] (unwind_backtrace) from [<c0011235>] >> (show_stack+0x11/0x14) >> [28744.256732] [<c0011235>] (show_stack) from [<c009b2d5>] >> (watchdog_timer_fn+0x191/0x1c4) >> [28744.256747] [<c009b2d5>] (watchdog_timer_fn) from [<c006be45>] >> (__run_hrtimer+0x61/0x1e0) >> [28744.256759] [<c006be45>] (__run_hrtimer) from [<c006c237>] >> (hrtimer_interrupt+0xcb/0x220) >> [28744.256773] [<c006c237>] (hrtimer_interrupt) from [<c0021f67>] >> (omap2_gp_timer_interrupt+0x23/0x28) >> [28744.256791] [<c0021f67>] (omap2_gp_timer_interrupt) from [<c006010f>] >> (handle_irq_event_percpu+0x5b/0x174) >> [28744.256804] [<c006010f>] (handle_irq_event_percpu) from [<c0060261>] >> (handle_irq_event+0x39/0x58) >> [28744.256819] [<c0060261>] (handle_irq_event) from [<c0061f1f>] >> (handle_level_irq+0x8b/0xd8) >> [28744.256832] [<c0061f1f>] (handle_level_irq) from [<c005fa7f>] >> (generic_handle_irq+0x23/0x2c) >> [28744.256844] [<c005fa7f>] (generic_handle_irq) from [<c005fc33>] >> (__handle_domain_irq+0x57/0xac) >> [28744.256857] [<c005fc33>] (__handle_domain_irq) from [<c0009349>] >> (omap_intc_handle_irq+0x85/0x8c) >> [28744.256873] [<c0009349>] (omap_intc_handle_irq) from [<c063d39b>] >> (__irq_svc+0x3b/0x80) >> [28744.256880] Exception stack(0xc0a4ff50 to 0xc0a4ff98) >> [28744.256889] ff40: 00000001 >> 00000000 00000000 c001c041 >> [28744.256900] ff60: c0a4e000 c0a510f8 00000000 00000000 c0b01a48 >> 00000001 c0aebb70 c0a51104 >> [28744.256909] ff80: c0a4e03c c0a4ff98 c000efff c000f000 40000033 ffffffff >> [28744.256923] [<c063d39b>] (__irq_svc) from [<c000f000>] >> (arch_cpu_idle+0x28/0x2c) >> [28744.256936] [<c000f000>] (arch_cpu_idle) from [<c004f189>] >> (cpu_startup_entry+0x1e1/0x248) >> [28744.256951] [<c004f189>] (cpu_startup_entry) from [<c09dea57>] >> (start_kernel+0x33f/0x348) >> >> is it a bug on the kernel ? >> >> Micka, >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> >> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
