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[IPv6:2a00:1450:4864:20::32e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F2EFAC08C5C6 for ; Fri, 29 May 2020 01:08:14 -0700 (PDT) Received: by mail-wm1-x32e.google.com with SMTP id r15so2248274wmh.5 for ; Fri, 29 May 2020 01:08:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amarulasolutions.com; s=google; h=mime-version:from:date:message-id:subject:to:cc; bh=BYoKb1ZwXWdA+/acuUHerHojHOVMSLm9UoOs8rK8P7o=; b=pR97UXMokn5/7AKmtWLhqI2zPd3m5nxtQrLP0K+peMwlVkfDXQel32fLQDAgxRe4KQ /Zf9hAYPmggR4mxL5DuTeZ/IR07dHhrigVJr+Kzw3vNenxlJkvte16gqRkIPgcjlIOqq ba8zerCOMXMriHCJ9lQIIxZRVbrq8pRMXPugw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=BYoKb1ZwXWdA+/acuUHerHojHOVMSLm9UoOs8rK8P7o=; b=iJ0Ljy/aYxfKf4n9+3ZDcUJPuR1IsXh7pRMK/XfLw1i3Ez3D3JJBBJOw8jM77cNeXU NmROguNyjIGDuNyQSDuLgYC+YZ8i5Pczp0YIZYRtLyL49yOxvCtEtEoAT0d7Htdv3Hr/ xv/AS6fqPhJT8LxSVfgzOcWp+su7EuPThhguIYGh4kV+n44ueJbnDJmkR9zvlvTnUOZH LPeX4rgonVTR+Uq34oa+IjVS8p0PkfBWVORMIeMrY5845CsypRxn+t3qAiRSf6RCYnlz +LkRf88CuzaSbl0pNXhl9ZkOeft4xQtH/S9TimtNKTjWrpixEAQIETPaki597P1CUBAa H2bw== X-Gm-Message-State: AOAM5323x2S13y1FD4heGSVf6J4thScNVFcpt1vQpfTEPWM/iBbHIV4V zhN/tLytpLlymLoDjopgcx4H3wN3Ggt9NqBScCCwEHpwS1s= X-Received: by 2002:a1c:5411:: with SMTP id i17mr7675147wmb.137.1590739692897; Fri, 29 May 2020 01:08:12 -0700 (PDT) MIME-Version: 1.0 From: Michael Nazzareno Trimarchi Date: Fri, 29 May 2020 10:08:01 +0200 Message-ID: Subject: linux-rt stall on imx6dl on patch-5.4.22-rt13.patch To: LKML , linux-rt-users@vger.kernel.org Cc: Sebastian Andrzej Siewior Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all I get this stack trace echo 3 > /proc/sys/vm/drop_caches chrt -f 99 sysbench --test=cpu --num-threads=2 First of all, I need to know that if it is a valid use case because was raised by the testing team and how can I start and where to take a look at it Best Regards Michael [ 161.709260] 001: sh (480): drop_caches: 3 [ 180.234358] 001: sched: RT throttling activated [ 180.283363] 001: fec 2188000.ethernet eth0: MDIO read timeout [ 180.283406] 001: ------------[ cut here ]------------ [ 180.283416] 001: WARNING: CPU: 1 PID: 133 at drivers/net/phy/phy.c:716 phy_er ror+0x24/0x64 [ 180.283460] 001: Modules linked in: [ 180.283473] 001: CPU: 1 PID: 133 Comm: kworker/1:2 Tainted: G W 5.4.23-rt13 #1 [ 180.283494] 001: Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) [ 180.283531] 001: Workqueue: events_power_efficient phy_state_machine [ 180.283550] 001: [] (unwind_backtrace) from [] (show_stac k+0x10/0x14) [ 180.283591] 001: [] (show_stack) from [] (dump_stack+0xd4 /0x108) [ 180.283624] 001: [] (dump_stack) from [] (__warn+0xc0/0x1 0c) [ 180.283657] 001: [] (__warn) from [] (warn_slowpath_fmt+0 x5c/0xc0) [ 180.283680] 001: [] (warn_slowpath_fmt) from [] (phy_erro r+0x24/0x64) [ 180.283706] 001: [] (phy_error) from [] (phy_state_machin e+0x68/0x148) [ 180.283727] 001: [] (phy_state_machine) from [] (process_ one_work+0x2c8/0x884) [ 180.283760] 001: [] (process_one_work) from [] (worker_th read+0x2c/0x580) [ 180.283785] 001: [] (worker_thread) from [] (kthread+0x13 4/0x148) [ 180.283815] 001: [] (kthread) from [] (ret_from_fork+0x14 /0x38) [ 180.283836] 001: Exception stack(0xd8873fb0 to 0xd8873ff8) [ 180.283854] 001: 3fa0: 00000000 00000000 00000000 00000000 [ 180.283874] 001: 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 180.283890] 001: 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000 [ 181.243070] 001: irq event stamp: 52613 [ 181.243094] 001: hardirqs last enabled at (52615): [] prb_unlock+0 x84/0x94 [ 181.243134] 001: hardirqs last disabled at (52616): [] prb_lock+0xb 4/0x134 [ 181.243151] 001: softirqs last enabled at (42468): [] addrconf_ver ify_rtnl+0x20c/0x620 [ 181.243180] 001: softirqs last disabled at (42461): [] addrconf_ver ify_rtnl+0x14/0x620 [ 181.243196] 001: ---[ end trace 0000000000000005 ]--- [ 181.244845] 001: fec 2188000.ethernet eth0: Link is Down [ 182.243188] 001: fec 2188000.ethernet eth0: MDIO read timeout [ 205.253023] 001: rcu: INFO: rcu_preempt self-detected stall on CPU [ 205.253041] 001: rcu: 1-...!: (2599 ticks this GP) idle=50a/0/0x1 softirq=0/0 fqs=0 [ 205.253060] 001: (t=2600 jiffies g=7097 q=301) [ 205.253061] 001: rcu: rcu_preempt kthread starved for 2600 jiffies! g7097 f0x0 RCU_GP_WAIT_FQS(5) ->st ate=0x0 ->cpu=0 [ 205.253071] 001: rcu: RCU grace-period kthread stack dump: [ 205.253078] 001: rcu_preempt R running task 0 10 2 0x00000000 [ 205.253096] 001: [] (__schedule) from [] (schedule+0x50/0xf8) [ 205.253121] 001: [] (schedule) from [] (schedule_timeout+0x1bc/0x39c) [ 205.253137] 001: [] (schedule_timeout) from [] (rcu_gp_kthread+0x764/0x246c) [ 205.253160] 001: [] (rcu_gp_kthread) from [] (kthread+0x134/0x148) [ 205.253176] 001: [] (kthread) from [] (ret_from_fork+0x14/0x38) [ 205.253190] 001: Exception stack(0xd80e7fb0 to 0xd80e7ff8) [ 205.253198] 001: 7fa0: 00000000 00000000 00000000 00000000 [ 205.253208] 001: 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 205.253217] 001: 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 [ 205.253231] 001: NMI backtrace for cpu 1 [ 205.253238] 001: CPU: 1 PID: 0 Comm: swapper/1 Tainted: G W 5.4.23-rt13 #1 [ 205.253246] 001: Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) [ 205.253253] 001: [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [ 205.253271] 001: [] (show_stack) from [] (dump_stack+0xd4/0x108) [ 205.253288] 001: [] (dump_stack) from [] (nmi_cpu_backtrace+0x74/0xac) [ 205.253303] 001: [] (nmi_cpu_backtrace) from [] (nmi_trigger_cpumask_backtrace+0x1 44/0x1ac) [ 205.253315] 001: [] (nmi_trigger_cpumask_backtrace) from [] (rcu_dump_cpu_stacks+0 x98/0xd0) [ 205.253329] 001: [] (rcu_dump_cpu_stacks) from [] (rcu_sched_clock_irq+0x824/0xb48 ) [ 205.253344] 001: [] (rcu_sched_clock_irq) from [] (update_process_times+0x2c/0x60) [ 205.253361] 001: [] (update_process_times) from [] (tick_sched_timer+0x64/0xcc) [ 205.253376] 001: [] (tick_sched_timer) from [] (__hrtimer_run_queues+0x170/0x788) [ 205.253388] 001: [] (__hrtimer_run_queues) from [] (hrtimer_interrupt+0x130/0x2d8) [ 205.253400] 001: [] (hrtimer_interrupt) from [] (twd_handler+0x2c/0x38) [ 205.253413] 001: [] (twd_handler) from [] (handle_percpu_devid_irq+0xf0/0x4dc) [ 205.253429] 001: [] (handle_percpu_devid_irq) from [] (generic_handle_irq+0x20/0x3 4) [ 205.253446] 001: [] (generic_handle_irq) from [] (__handle_domain_irq+0x8c/0x128) [ 205.253457] 001: [] (__handle_domain_irq) from [] (gic_handle_irq+0x4c/0xa8) [ 205.253473] 001: [] (gic_handle_irq) from [] (__irq_svc+0x70/0xc4) [ 205.253483] 001: Exception stack(0xd80f9f10 to 0xd80f9f58) [ 205.253491] 001: 9f00: 00000001 00000006 00000000 d80ec600 [ 205.253501] 001: 9f20: 00000000 c1318854 c1401768 ca083cee c9ae857c 0000002f dbbb2ab8 00000000 [ 205.253510] 001: 9f40: 00000000 d80f9f60 c0187400 c08c60bc 200d0113 ffffffff [ 205.253516] 001: [] (__irq_svc) from [] (cpuidle_enter_state+0x168/0x6c0) [ 205.253530] 001: [] (cpuidle_enter_state) from [] (cpuidle_enter+0x28/0x38) [ 205.253540] 001: [] (cpuidle_enter) from [] (do_idle+0x258/0x2e4) [ 205.253553] 001: [] (do_idle) from [] (cpu_startup_entry+0x18/0x20) [ 205.253563] 001: [] (cpu_startup_entry) from [<1010296c>] (0x1010296c) [ 227.234448] 000: mmc1: Timeout waiting for hardware interrupt. [ 227.234472] 000: mmc1: sdhci: ============ SDHCI REGISTER DUMP =========== [ 227.234486] 000: mmc1: sdhci: Sys addr: 0x18e7d800 | Version: 0x00000002 [ 227.234502] 000: mmc1: sdhci: Blk size: 0x00000200 | Blk cnt: 0x00000000 [ 227.234515] 000: mmc1: sdhci: Argument: 0x000570bc | Trn mode: 0x0000003b [ 227.234527] 000: mmc1: sdhci: Present: 0x01fd8008 | Host ctl: 0x00000013 [ 227.234539] 000: mmc1: sdhci: Power: 0x00000002 | Blk gap: 0x00000080 [ 227.234550] 000: mmc1: sdhci: Wake-up: 0x00000008 | Clock: 0x0000001f [ 227.234560] 000: mmc1: sdhci: Timeout: 0x0000008f | Int stat: 0x00000003 [ 227.234570] 000: mmc1: sdhci: Int enab: 0x117f100b | Sig enab: 0x117f100b [ 227.234582] 000: mmc1: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000103 [ 227.234593] 000: mmc1: sdhci: Caps: 0x07eb0000 | Caps_1: 0x0000a000 [ 227.234606] 000: mmc1: sdhci: Cmd: 0x0000123a | Max curr: 0x00ffffff [ 227.234617] 000: mmc1: sdhci: Resp[0]: 0x00000900 | Resp[1]: 0xffffffff [ 227.234629] 000: mmc1: sdhci: Resp[2]: 0x320f5903 | Resp[3]: 0x00000900 [ 227.234640] 000: mmc1: sdhci: Host ctl2: 0x00000000 [ 227.234650] 000: mmc1: sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x2c047208 [ 227.234661] 000: mmc1: sdhci: ============================================ [ 283.293246] 001: rcu: INFO: rcu_preempt self-detected stall on CPU [ 283.293276] 001: rcu: 1-...!: (10403 ticks this GP) idle=77a/1/0x40000002 softirq=0/0 fqs=0 [ 283.293313] 001: (t=10404 jiffies g=7097 q=827) [ 283.293316] 001: rcu: rcu_preempt kthread starved for 10404 jiffies! g7097 f0x0 RCU_GP_WAIT_FQS(5) ->s tate=0x0 ->cpu=0 [ 283.293336] 001: rcu: RCU grace-period kthread stack dump: [ 283.293350] 001: rcu_preempt R running task 0 10 2 0x00000000 [ 283.293381] 001: [] (__schedule) from [] (schedule+0x50/0xf8) [ 283.293430] 001: [] (schedule) from [] (schedule_timeout+0x1bc/0x39c) [ 283.293460] 001: [] (schedule_timeout) from [] (rcu_gp_kthread+0x764/0x246c) [ 283.293500] 001: [] (rcu_gp_kthread) from [] (kthread+0x134/0x148) [ 283.293533] 001: [] (kthread) from [] (ret_from_fork+0x14/0x38) [ 283.293556] 001: Exception stack(0xd80e7fb0 to 0xd80e7ff8) [ 283.293574] 001: 7fa0: 00000000 00000000 00000000 00000000 [ 283.293593] 001: 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 283.293610] 001: 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 [ 283.293634] 001: NMI backtrace for cpu 1 [ 283.293647] 001: CPU: 1 PID: 484 Comm: sysbench Tainted: G W 5.4.23-rt13 #1 [ 283.293662] 001: Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) [ 283.293676] 001: [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [ 283.293713] 001: [] (show_stack) from [] (dump_stack+0xd4/0x108) [ 283.293743] 001: [] (dump_stack) from [] (nmi_cpu_backtrace+0x74/0xac) [ 283.293772] 001: [] (nmi_cpu_backtrace) from [] (nmi_trigger_cpumask_backtrace+0x1 44/0x1ac) [ 283.293795] 001: [] (nmi_trigger_cpumask_backtrace) from [] (rcu_dump_cpu_stacks+0 x98/0xd0) [ 283.293829] 001: [] (rcu_dump_cpu_stacks) from [] (rcu_sched_clock_irq+0x824/0xb48 ) [ 283.293852] 001: [] (rcu_sched_clock_irq) from [] (update_process_times+0x2c/0x60) [ 283.293887] 001: [] (update_process_times) from [] (tick_sched_timer+0x64/0xcc) [ 283.293914] 001: [] (tick_sched_timer) from [] (__hrtimer_run_queues+0x170/0x788) [ 283.293939] 001: [] (__hrtimer_run_queues) from [] (hrtimer_interrupt+0x130/0x2d8) [ 283.293962] 001: [] (hrtimer_interrupt) from [] (twd_handler+0x2c/0x38) [ 283.293988] 001: [] (twd_handler) from [] (handle_percpu_devid_irq+0xf0/0x4dc) [ 283.294016] 001: [] (handle_percpu_devid_irq) from [] (generic_handle_irq+0x20/0x3 4) [ 283.294045] 001: [] (generic_handle_irq) from [] (__handle_domain_irq+0x8c/0x128) [ 283.294069] 001: [] (__handle_domain_irq) from [] (gic_handle_irq+0x4c/0xa8) [ 283.294096] 001: [] (gic_handle_irq) from [] (__irq_usr+0x54/0x80) [ 283.294116] 001: Exception stack(0xd8da7fb0 to 0xd8da7ff8) [ 283.294134] 001: 7fa0: 00000332 00000000 000010c0 00000004 [ 283.294154] 001: 7fc0: 00000860 00000000 00000006 b6f42d68 00000199 00000000 00002710 00000666 [ 283.294174] 001: 7fe0: 00000000 b6f42d44 004547bd 004548f0 800d0030 ffffffff [ 361.323392] 001: rcu: INFO: rcu_preempt self-detected stall on CPU [ 361.323420] 001: rcu: 1-...!: (18206 ticks this GP) idle=a96/1/0x40000002 softirq=0/0 fqs=0 [ 361.323456] 001: (t=18207 jiffies g=7097 q=1165) [ 361.323459] 001: rcu: rcu_preempt kthread starved for 18207 jiffies! g7097 f0x0 RCU_GP_WAIT_FQS(5) ->s tate=0x0 ->cpu=0 [ 361.323479] 001: rcu: RCU grace-period kthread stack dump: [ 361.323491] 001: rcu_preempt R running task 0 10 2 0x00000000 [ 361.323523] 001: [] (__schedule) from [] (schedule+0x50/0xf8) [ 361.323571] 001: [] (schedule) from [] (schedule_timeout+0x1bc/0x39c) [ 361.323600] 001: [] (schedule_timeout) from [] (rcu_gp_kthread+0x764/0x246c) [ 361.323639] 001: [] (rcu_gp_kthread) from [] (kthread+0x134/0x148) [ 361.323671] 001: [] (kthread) from [] (ret_from_fork+0x14/0x38) [ 361.323692] 001: Exception stack(0xd80e7fb0 to 0xd80e7ff8) [ 361.323711] 001: 7fa0: 00000000 00000000 00000000 00000000 [ 361.323730] 001: 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 361.323747] 001: 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 [ 361.323770] 001: NMI backtrace for cpu 1 [ 361.323783] 001: CPU: 1 PID: 484 Comm: sysbench Tainted: G W 5.4.23-rt13 #1 [ 361.323798] 001: Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) [ 361.323812] 001: [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [ 361.323850] 001: [] (show_stack) from [] (dump_stack+0xd4/0x108) [ 361.323879] 001: [] (dump_stack) from [] (nmi_cpu_backtrace+0x74/0xac) [ 361.323906] 001: [] (nmi_cpu_backtrace) from [] (nmi_trigger_cpumask_backtrace+0x1 44/0x1ac) [ 361.323929] 001: [] (nmi_trigger_cpumask_backtrace) from [] (rcu_dump_cpu_stacks+0 x98/0xd0) [ 361.323960] 001: [] (rcu_dump_cpu_stacks) from [] (rcu_sched_clock_irq+0x824/0xb48 ) [ 361.323985] 001: [] (rcu_sched_clock_irq) from [] (update_process_times+0x2c/0x60) [ 361.324018] 001: [] (update_process_times) from [] (tick_sched_timer+0x64/0xcc) [ 361.324047] 001: [] (tick_sched_timer) from [] (__hrtimer_run_queues+0x170/0x788) [ 361.324070] 001: [] (__hrtimer_run_queues) from [] (hrtimer_interrupt+0x130/0x2d8) [ 361.324094] 001: [] (hrtimer_interrupt) from [] (twd_handler+0x2c/0x38) [ 361.324119] 001: [] (twd_handler) from [] (handle_percpu_devid_irq+0xf0/0x4dc) [ 361.324146] 001: [] (handle_percpu_devid_irq) from [] (generic_handle_irq+0x20/0x3 4) [ 361.324175] 001: [] (generic_handle_irq) from [] (__handle_domain_irq+0x8c/0x128) [ 361.324200] 001: [] (__handle_domain_irq) from [] (gic_handle_irq+0x4c/0xa8) [ 361.324227] 001: [] (gic_handle_irq) from [] (__irq_usr+0x54/0x80) [ 361.324249] 001: Exception stack(0xd8da7fb0 to 0xd8da7ff8) [ 361.324264] 001: 7fa0: 00000e76 00000000 00000000 00000000 [ 361.324283] 001: 7fc0: 00000800 00000000 0000000a b6f42d68 0000073b 00000000 00002710 00000003 [ 361.324301] 001: 7fe0: 00000000 b6f42d44 004547bd 00454918 600d0030 ffffffff