Here is the backtrace: can1 456 [8] 0F 00 00 00 00 00 00 00 can1 354 [8] 0F 00 00 00 00 00 00 00 can1 331 [8] 0F 00 00 00 00 00 00 00 can1 234 [8] 01 00 00 00 00 00 00 00 can1 044 [8] 00 00 00 00 00 00 07 00 can1 354 [8]^C can1 456 [8] 0F 00 00 00 00 00 00 00 root@ccimx6ulcvdp:~/tmp# BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 root@ccimx6ulcvdp:~/tmp# ifconfiBUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 gBUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 cBUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 anBUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 1BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 doBUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 BUG: using __this_cpu_add() in preemptible [00000000] code: irq/194-mcp25xx/805 wn Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = 80004000 [00000000] *pgd=00000000 Internal error: Oops: 17 [#1] PREEMPT SMP ARM Modules linked in: cryptodev(O) wlan(O) CPU: 0 PID: 805 Comm: irq/194-mcp25xx Tainted: G O 4.9.65-dey+gf832589 #41 Hardware name: Freescale i.MX6 UltraLite (Device Tree) task: b9322840 task.stack: b9356000 PC is at _raw_spin_lock_irqsave+0x2c/0x6c LR is at preempt_count_add+0x134/0x164 pc : [<8094d6c4>] lr : [<801520d8>] psr: 00010193 sp : b9357e68 ip : b9357e48 fp : b9357e7c r10: ffff0ff3 r9 : 00000000 r8 : 00018834 r7 : b82f4c50 r6 : 00000000 r5 : 80010113 r4 : 00000000 r3 : b9322840 r2 : 00000001 r1 : ffffffff r0 : 00000000 Flags: nzcv IRQs off FIQs on Mode SVC_32 ISA ARM Segment none Control: 10c53c7d Table: b892006a DAC: 00000051 Process irq/194-mcp25xx (pid: 805, stack limit = 0xb9356210) Stack: (0xb9357e68 to 0xb9358000) 7e60: b82f44c0 00000005 b9357e94 b9357e80 805c7968 8094d6a4 7e80: b82f44c0 00000005 b9357ef4 b9357e98 805c6a44 805c7954 8045a584 b92b8600 7ea0: 8017e780 00000001 00000000 80c26db0 80c26d80 80a51448 80f6c564 b82f46d4 7ec0: 8094db74 80152114 b9357ef4 b92b8600 b8224d00 00000000 00000001 b8224d00 7ee0: b92b8600 8017e780 b9357f14 b9357ef8 8017e7ac 805c6204 b9356000 b92b8624 7f00: 00000000 00000001 b9357f54 b9357f18 8017ead4 8017e78c 80faae92 ffffe000 7f20: 00000000 8017e8ac 00000000 00000000 b92b8680 b9356000 b92b8600 8017e98c 7f40: 00000000 00000000 b9357fac b9357f58 8014956c 8017e998 00000000 00000000 7f60: 00000000 b92b8600 00000000 00000000 b9357f70 b9357f70 00000000 00000000 7f80: b9357f80 b9357f80 b9357fac b92b8680 80149464 00000000 00000000 00000000 7fa0: 00000000 b9357fb0 801082d8 80149470 00000000 00000000 00000000 00000000 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000 [<8094d6c4>] (_raw_spin_lock_irqsave) from [<805c7968>] (mcp25xxfd_can_tx_queue_restart+0x20/0x7c) [<805c7968>] (mcp25xxfd_can_tx_queue_restart) from [<805c6a44>] (mcp25xxfd_can_int+0x84c/0x974) [<805c6a44>] (mcp25xxfd_can_int) from [<8017e7ac>] (irq_thread_fn+0x2c/0x64) [<8017e7ac>] (irq_thread_fn) from [<8017ead4>] (irq_thread+0x148/0x200) [<8017ead4>] (irq_thread) from [<8014956c>] (kthread+0x108/0x120) [<8014956c>] (kthread) from [<801082d8>] (ret_from_fork+0x14/0x3c) Code: f10c0080 e3a00001 ebe01238 f594f000 (e1943f9f) ---[ end trace 355ef7f6bf82f534 ]--- note: irq/194-mcp25xx[805] exited with preempt_count 1 Unable to handle kernel paging request at virtual address ffffffec pgd = 80004000 [ffffffec] *pgd=bbfde861, *pte=00000000, *ppte=00000000 Internal error: Oops: 37 [#2] PREEMPT SMP ARM Modules linked in: cryptodev(O) wlan(O) CPU: 0 PID: 805 Comm: irq/194-mcp25xx Tainted: G D O 4.9.65-dey+gf832589 #41 Hardware name: Freescale i.MX6 UltraLite (Device Tree) task: b9322840 task.stack: b9356000 PC is at kthread_data+0x18/0x20 LR is at irq_thread_dtor+0x38/0xe0 pc : [<8014a1bc>] lr : [<8017e8e4>] psr: 20010193 sp : b9357c40 ip : b9357c50 fp : b9357c4c r10: 00000017 r9 : ffffe000 r8 : 00000000 r7 : b9322840 r6 : b9322c68 r5 : 80fb11f8 r4 : b9322840 r3 : 00000000 r2 : 0000b734 r1 : 0000b734 r0 : b9322840 Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment none Control: 10c53c7d Table: b892006a DAC: 00000051 Process irq/194-mcp25xx (pid: 805, stack limit = 0xb9356210) Stack: (0xb9357c40 to 0xb9358000) 7c40: b9357c64 b9357c50 8017e8e4 8014a1b0 b9322c4c 80fb11f8 b9357c8c b9357c68 7c60: 8014784c 8017e8b8 b9322840 0000000b 00000000 b9357c98 b9356000 ffffe000 7c80: b9357cb4 b9357c90 8012d3fc 80147788 b9356000 00000000 b9357cb4 b9357ca8 7ca0: 80128030 7f000000 b9357cf4 b9357cb8 8010ce64 8012d0c8 b9356210 0000000b 7cc0: 80116a44 60010193 80bd675c 00000000 b9357e18 00000017 00000000 00000000 7ce0: b9356000 ffff0ff3 b9357d0c b9357cf8 8011b920 8010cc28 b9357e18 00000000 7d00: b9357d64 b9357d10 8094eeb0 8011b8b8 805c8c8c 805b71d8 b9357da8 b9357da8 7d20: b8563400 00000000 805b4524 00000000 00000003 00000003 00000000 80f08a34 7d40: 00000017 8094ea8c 00000000 b9357e18 b9356000 ffff0ff3 b9357e14 b9357d68 7d60: 8010125c 8094ea98 805c8d80 8094b324 b82f2144 b82f2144 00000000 00000003 7d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 7da0: 00000802 00b71b00 b9357d18 b9357d18 00000000 0000067e 00000009 0000067c 7dc0: 00000001 00000000 b9357dfc b9357dd8 805c9044 805c8cc8 00000000 00000400 7de0: 00000000 bd200000 00000000 b82f44c0 b9357e3c 8094d6c4 00010193 ffffffff 7e00: b9357e4c 00018834 b9357e7c b9357e18 8094e178 8010121c 00000000 ffffffff 7e20: 00000001 b9322840 00000000 80010113 00000000 b82f4c50 00018834 00000000 7e40: ffff0ff3 b9357e7c b9357e48 b9357e68 801520d8 8094d6c4 00010193 ffffffff 7e60: 00000051 00000000 b82f44c0 00000005 b9357e94 b9357e80 805c7968 8094d6a4 7e80: b82f44c0 00000005 b9357ef4 b9357e98 805c6a44 805c7954 8045a584 b92b8600 7ea0: 8017e780 00000001 00000000 80c26db0 80c26d80 80a51448 80f6c564 b82f46d4 7ec0: 8094db74 80152114 b9357ef4 b92b8600 b8224d00 00000000 00000001 b8224d00 7ee0: b92b8600 8017e780 b9357f14 b9357ef8 8017e7ac 805c6204 b9356000 b92b8624 7f00: 00000000 00000001 b9357f54 b9357f18 8017ead4 8017e78c 80faae92 ffffe000 7f20: 00000000 8017e8ac 00000000 00000000 b92b8680 b9356000 b92b8600 8017e98c 7f40: 00000000 00000000 b9357fac b9357f58 8014956c 8017e998 00000000 00000000 7f60: 00000000 b92b8600 00000000 00000000 b9357f70 b9357f70 00000001 00010001 7f80: b9357f80 b9357f80 b9357fac b92b8680 80149464 00000000 00000000 00000000 7fa0: 00000000 b9357fb0 801082d8 80149470 00000000 00000000 00000000 00000000 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000 [<8014a1bc>] (kthread_data) from [<8017e8e4>] (irq_thread_dtor+0x38/0xe0) [<8017e8e4>] (irq_thread_dtor) from [<8014784c>] (task_work_run+0xd0/0xf0) [<8014784c>] (task_work_run) from [<8012d3fc>] (do_exit+0x340/0xa88) [<8012d3fc>] (do_exit) from [<8010ce64>] (die+0x248/0x344) [<8010ce64>] (die) from [<8011b920>] (__do_kernel_fault.part.0+0x74/0x1f4) [<8011b920>] (__do_kernel_fault.part.0) from [<8094eeb0>] (do_page_fault+0x424/0x438) [<8094eeb0>] (do_page_fault) from [<8010125c>] (do_DataAbort+0x4c/0xc8) [<8010125c>] (do_DataAbort) from [<8094e178>] (__dabt_svc+0x58/0x80) Exception stack(0xb9357e18 to 0xb9357e60) 7e00: 00000000 ffffffff 7e20: 00000001 b9322840 00000000 80010113 00000000 b82f4c50 00018834 00000000 7e40: ffff0ff3 b9357e7c b9357e48 b9357e68 801520d8 8094d6c4 00010193 ffffffff [<8094e178>] (__dabt_svc) from [<8094d6c4>] (_raw_spin_lock_irqsave+0x2c/0x6c) [<8094d6c4>] (_raw_spin_lock_irqsave) from [<805c7968>] (mcp25xxfd_can_tx_queue_restart+0x20/0x7c) [<805c7968>] (mcp25xxfd_can_tx_queue_restart) from [<805c6a44>] (mcp25xxfd_can_int+0x84c/0x974) [<805c6a44>] (mcp25xxfd_can_int) from [<8017e7ac>] (irq_thread_fn+0x2c/0x64) [<8017e7ac>] (irq_thread_fn) from [<8017ead4>] (irq_thread+0x148/0x200) [<8017ead4>] (irq_thread) from [<8014956c>] (kthread+0x108/0x120) [<8014956c>] (kthread) from [<801082d8>] (ret_from_fork+0x14/0x3c) Code: e24cb004 e52de004 e8bd4000 e5903320 (e5130014) ---[ end trace 355ef7f6bf82f535 ]--- Fixing recursive fault but reboot is needed! sched: RT throttling activated mca-cc6ul-rtc mca-cc6ul-rtc: Failed to set RTC time data: -110 reboot ^C^C The system is going down for reboot NOW! (pts/0) (Sun Jul 21 21:40:36 2019): INIT: Switching to runlevel: 6 INIT: Sending processes the TERM signal Stopping syslogd/klogd: stopped syslogd (pid 601) stopped klogd (pid 604) done Stopping Dropbear SSH server: stopped /usr/sbin/dropbear (pid 642) dropbear. On Wed, Jul 24, 2019 at 5:36 AM Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> wrote: > > On 7/24/19 3:28 AM, Tom Prohaszka wrote: > > We implemented the MCP25xxfd driver patch V7 and are experiencing an > > issue when the CPU load for the mcp25xxfd driver is over 30%. Using > > CANDump or our custom application, we see: > > > > root@ccimx6ulcvdp:~/tmp# BUG: using __this_cpu_add() in preemptible > > [00000000] code: irq/194-mcp25xx/805 > > Do you have a full OOPS/backtrace for this? > > > When this occurs, the kernel eventually crashes. Has this been seen > > by anyone, or any suggestions on what could cause this? > > > > Our system is: > > CAN 2.0 Std, 500Kbps, Tx/Rx enabled, but only Receiving CAN messages > > Digi Imx6ul, > > MCP2517 clk 40Mhz > > SPI Clk 12 Mhz > > Linux version 4.9.65-dey+gf832589 (gcc version 6.2.0 (GCC) ) #41 SMP > > PREEMPT Sun Jul 7 21:39:25 EDT 2019 > > > > On a secondary question, in the driver comments, it was mentioned that > > transfer rate was >99% with no network statistics, but when network > > statistics are used, the transfer rate drops 60%. > > We don't care about network statistics, can you provide info on how > > you turned this off? > > Adding Martin on Cc. > > Marc > > -- > Pengutronix e.K. | Marc Kleine-Budde | > Industrial Linux Solutions | Phone: +49-231-2826-924 | > Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | > Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de | >
