Marco F.

Update: if I use a previous kernel version everything works: root@nanopineo:~# hostnamectl Static hostname: nanopineo Icon name: computer Machine ID: 6f25fe73523b462c903f2c486e612f38 Boot ID: a687cc17d9d6443c9c091c01fbabece0 Operating System: Ubuntu 20.04 LTS Kernel: Linux 5.4.45-sunxi Architecture: arm root@nanopineo:~# ip link set can0 type can bitrate 12500 root@nanopineo:~# ip link set can0 up root@nanopineo:~# candump can0 & [1] 1839 root@nanopineo:~# cansend can0 AAA#11223344 root@nanopineo:~# cat /proc/net/can/stats 3 transmitted frames (TXF) 0 received frames (RXF) 0 matched frames (RXMF) 0 % total match ratio (RXMR) 0 frames/s total tx rate (TXR) 0 frames/s total rx rate (RXR) 0 % current match ratio (CRXMR) 0 frames/s current tx rate (CTXR) 0 frames/s current rx rate (CRXR) 0 % max match ratio (MRXMR) 1 frames/s max tx rate (MTXR) 0 frames/s max rx rate (MRXR) 1 current receive list entries (CRCV) 1 maximum receive list entries (MRCV) 1 statistic resets (STR)

I have the same issue with latest Armbian Focal and Nanopi Neo. I can add that if I have many ssh sessions I can use all commands exept those regarding networking. These are the processes and interrups I can see: 1477 ? I 0:00 [kworker/0:0-events] 1496 ? I 0:00 [kworker/0:2-events] 1497 ? I 0:00 [kworker/3:1-events] 1508 pts/0 D+ 0:00 ifconfig can0 up 1509 ? D 0:00 [irq/67-spi1.0] 1510 ? I< 0:00 [mcp251x_wq] 1511 ttyS0 D+ 0:00 ip -s -d link show can0 1512 ? I 0:00 [kworker/1:0-mm_percpu_wq] 1513 ? I 0:00 [kworker/2:0-events] 1516 ? I 0:00 [kworker/0:3-events] 1517 ? I 0:00 [kworker/3:0-events_power_efficient] 1522 pts/1 R+ 0:00 ps -ax root@nanopineo:~# cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 17: 0 0 0 0 GICv2 50 Level timer@1c20c00 18: 0 0 0 0 GICv2 29 Level arch_timer 19: 10173 5154 5328 13484 GICv2 30 Level arch_timer 22: 0 0 0 0 GICv2 82 Level 1c02000.dma-controller 24: 7436 0 0 0 GICv2 92 Level sunxi-mmc 25: 819 0 0 0 GICv2 94 Level sunxi-mmc 27: 1 0 0 0 GICv2 103 Level musb-hdrc.2.auto 28: 0 0 0 0 GICv2 104 Level ehci_hcd:usb1 29: 0 0 0 0 GICv2 105 Level ohci_hcd:usb2 30: 0 0 0 0 GICv2 106 Level ehci_hcd:usb3 31: 0 0 0 0 GICv2 107 Level ohci_hcd:usb6 32: 0 0 0 0 GICv2 108 Level ehci_hcd:usb4 33: 0 0 0 0 GICv2 109 Level ohci_hcd:usb7 34: 167 0 0 0 GICv2 110 Level ehci_hcd:usb5 35: 0 0 0 0 GICv2 111 Level ohci_hcd:usb8 39: 494 0 0 0 GICv2 114 Level eth0 40: 13 0 0 0 GICv2 98 Level sun6i-spi 42: 2288 0 0 0 GICv2 32 Level ttyS0 43: 0 0 0 0 sun6i-r-intc 8 Level 1f00000.rtc 46: 0 0 0 0 GICv2 125 Level 1400000.deinterlace 47: 0 0 0 0 GICv2 90 Level 1c0e000.video-codec 48: 0 0 0 0 GICv2 126 Level sun8i-ce-ns 56: 4245 0 0 0 GICv2 63 Level ths 57: 0 0 0 0 GICv2 152 Level arm-pmu 58: 0 0 0 0 GICv2 153 Level arm-pmu 59: 0 0 0 0 GICv2 154 Level arm-pmu 60: 0 0 0 0 GICv2 155 Level arm-pmu 67: 1 0 0 0 sunxi_pio_edge 6 Edge spi1.0 105: 1 0 0 0 sunxi_pio_edge 44 Edge usb0-id-det 128: 1 0 0 0 sunxi_pio_edge 3 Edge k1 IPI0: 0 0 0 0 CPU wakeup interrupts IPI1: 0 0 0 0 Timer broadcast interrupts IPI2: 2044 4286 3803 3567 Rescheduling interrupts IPI3: 650 719 542 718 Function call interrupts IPI4: 0 0 0 0 CPU stop interrupts IPI5: 3193 113 233 1245 IRQ work interrupts IPI6: 0 0 0 0 completion interrupts Err: 0 Any help? Thanks.