Kernel Oops / segfault when loading dw_apb_raw_uart (piVCCU DKMS) on Armbian 6.12.58-current-sunxi (armv7l, Banana Pi M2+ / H3)

[maxl95]

Hi,
I’m trying to run piVCCU on a Banana Pi M2+ (Allwinner H3, armv7l) with Armbian and I can reproduce a kernel Oops when the piVCCU UART driver (dw_apb_raw_uart) is loaded.
I created a new DTS file based on the Orange Pi H3 and adapted detect_board.inc. After that, I generated the packages using create_devicetree_armbian.sh and create_modules_dkms.sh and then installed them successfully. After I load the dw_apb_raw_uart module, the kernel oops attached below occurs.
Maybe someone can lend me a hand so that I can get the problem under control. I would be very grateful for that!
If any further relevant information is needed, I will of course be happy to provide it.

Environment:

• Board: Banana Pi M2+ (Allwinner H3)
• Armbian: Armbian 25.11.2 trixie
• Kernel: 6.12.58-current-sunxi
• Architecture: armv7l
• piVCCU modules: pivccu-modules-dkms 1.0.87

custom DTS-File:

/dts-v1/;
/plugin/;

/ {
  compatible = "sinovoip,bpi-m2-plus", "allwinner,sun8i-h3";

  fragment@0 {
    target = <&uart3>;
    __overlay__ {
      pinctrl-names = "default";
      pinctrl-0 = <&uart3_pins>;
      status = "okay";
      compatible = "pivccu,dw_apb";
      pivccu,reset-gpios = <&pio 0 10 0>, <&pio 0 16 0>;
      pivccu,rtc = <&rpi_rf_mod_rtc>;
    };
  };


  fragment@1 {
    target = <&i2c0>;
    __overlay__ {
      #address-cells = <1>;
      #size-cells = <0>;
      status = "okay";

      rpi_rf_mod_rtc: rx8130@32 {
        compatible = "epson,rx8130-legacy";
        reg = <0x32>;
        status = "okay";
        aux-voltage-chargeable = <1>;
        enable-external-capacitor;
      };
    };
  };
};

edited detect_board.inc:

if [ ! -z "$1" ]; then
  DEV_TREE_COMPATIBLE="$1"
elif [ -e /proc/device-tree/compatible ]; then
  DEV_TREE_COMPATIBLE=$(strings /proc/device-tree/compatible)
fi

if [ ! -z "$DEV_TREE_COMPATIBLE" ]; then
  for str in $DEV_TREE_COMPATIBLE; do
    case $str in
      xunlong,orangepi-one|xunlong,orangepi-lite|xunlong,orangepi-plus|xunlong,orangepi-plus2e|xunlong,orangepi-2|xunlong,orangepi-pc|xunlong,orangepi-pc-plus)
        OVERLAY_MODE='overlay'
        OVERLAY_FILE='pivccu-orangepi-h3.dtbo'
        break
        ;;
      xunlong,orangepi-zero|xunlong,orangepi-r1)
        OVERLAY_MODE='overlay'
        OVERLAY_FILE='pivccu-orangepi-h2plus.dtbo'
        break
        ;;
      xunlong,orangepi-zero-plus)
        OVERLAY_MODE='overlay'
        OVERLAY_FILE='pivccu-orangepi-h5.dtbo'
        break
        ;;
      lemaker,bananapi)
        OVERLAY_MODE='overlay'
        OVERLAY_FILE='pivccu-bananapi-m1.dtbo'
        break;
        ;;
      sinovoip,bpi-m2-plus)
        OVERLAY_MODE='overlay'
        OVERLAY_FILE='pivccu-bananapi-m2plus.dtbo'
        break
        ;;
      lemaker,bananapro)
        OVERLAY_MODE='overlay'
        OVERLAY_FILE='pivccu-bananapi-pro.dtbo'
        break;
        ;;
      asus,rk3288-tinker|asus,rk3288-tinker-s)
        OVERLAY_MODE='patch'
        INCLUDE_FILE='/var/lib/piVCCU/dts/tinkerboard.dts.include'
        FDT_FILE='rk3288-tinker.dtb rk3288-tinker-s.dtb'
        break
        ;;
      pine64,rock64)
        OVERLAY_MODE='patch'
        INCLUDE_FILE='/var/lib/piVCCU/dts/rock64.dts.include'
        FDT_FILE='rockchip/rk3328-rock64.dtb'
        break
        ;;
      pine64,rockpro64)
        OVERLAY_MODE='patch'
        INCLUDE_FILE='/var/lib/piVCCU/dts/rockpro64.dts.include'
        FDT_FILE='rockchip/rk3399-rockpro64.dtb'
        break
        ;;
      hardkernel,odroid-c2)
        OVERLAY_MODE='patch'
        INCLUDE_FILE='/var/lib/piVCCU/dts/odroidc2.dts.include'
        FDT_FILE='amlogic/meson-gxbb-odroidc2.dtb'
        break
        ;;
      hardkernel,odroid-c4)
        OVERLAY_MODE='patch'
        INCLUDE_FILE='/var/lib/piVCCU/dts/odroidc4.dts.include'
        FDT_FILE='amlogic/meson-sm1-odroid-c4.dtb'
        break
        ;;
      libretech,cc|libretech,aml-s905x-cc)
        OVERLAY_MODE='patch'
        INCLUDE_FILE='/var/lib/piVCCU/dts/lepotato.dts.include'
        FDT_FILE='amlogic/meson-gxl-s905x-libretech-cc.dtb'
        break
        ;;
      friendlyelec,nanopc-t4|friendlyarm,nanopc-t4)
        OVERLAY_MODE='patch'
        INCLUDE_FILE='/var/lib/piVCCU/dts/nanopct4.dts.include'
        FDT_FILE='rockchip/rk3399-nanopc-t4.dtb'
        break
        ;;
      friendlyelec,nanopi-m4|friendlyarm,nanopi-m4)
        OVERLAY_MODE='patch'
        INCLUDE_FILE='/var/lib/piVCCU/dts/nanopim4.dts.include'
        FDT_FILE='rockchip/rk3399-nanopi-m4.dtb'
        break
        ;;
      radxa,rockpi4)
        OVERLAY_MODE='patch'
        INCLUDE_FILE='/var/lib/piVCCU/dts/rockpi4.dts.include'
        FDT_FILE='rockchip/rk3399-rock-pi-4.dtb'
        break
        ;;
    esac
  done
fi

case "$OVERLAY_MODE" in
  patch)
    CONFIG_FDT_FILE=`grep -e '^fdt_file=' /boot/armbianEnv.txt | cut -d= -f2`
    if [ ! -z "$CONFIG_FDT_FILE" ]; then
      FDT_FILE=$CONFIG_FDT_FILE
    fi

    CONFIG_FDT_FILE=`grep -e '^fdtfile=' /boot/armbianEnv.txt | cut -d= -f2`
    if [ ! -z "$CONFIG_FDT_FILE" ]; then
      FDT_FILE=$CONFIG_FDT_FILE
    fi

    if [ -z "$FDT_FILE" ]; then
      echo "piVCCU: Error! Current FDT could not be determined"
      exit
    fi

    if [ -z "$INCLUDE_FILE" ]; then
      echo "piVCCU: Error! Hardware platform is not supported"
      exit
    fi
    ;;

  overlay)
    if [ -z "$OVERLAY_FILE" ]; then
      echo "piVCCU: Error! Hardware platform is not supported"
      exit
    fi
    OVERLAY=`basename "$OVERLAY_FILE" .dtbo`
    ;;

  *)
    echo "piVCCU: Error! Hardware platform is not supported"
    exit
    ;;
esac

Kernel-oops:

root@BPI-M2plus:~# modprobe dw_apb_raw_uart
[  421.420663] Internal error: Oops: 5 [#1] SMP THUMB2
[  421.425630] Modules linked in: generic_raw_uart(O) aes_arm_bs crypto_simd aes_arm ccm brcmfmac_wcc snd_soc_hdmi_codec hci_uart btrtl btbcm bluetooth lima ecdh_generic sunxi_cir ecc rtl8187 gpu_sched dw_hdmi_i2s_audio eeprom_93cx6 dw_hdmi_cec drm_shmem_helper mac80211 libarc4 brcmfmac sun8i_thermal brcmutil sunxi_cedrus(C) v4l2_mem2mem binfmt_misc videobuf2_dma_contig videobuf2_memops videobuf2_v4l2 videobuf2_common videodev mc display_connector cpufreq_dt zram 842_decompress 842_compress cfg80211 rfkill evdev usb_f_eem g_ether usb_f_rndis u_ether libcomposite nfnetlink ip_tables x_tables autofs4 sunxi phy_generic pwrseq_simple uio_pdrv_genirq gpio_keys uio realtek ac200_phy
[  421.486120] CPU: 2 UID: 0 PID: 1644 Comm: modprobe Tainted: G         C O       6.12.58-current-sunxi #1
[  421.495707] Tainted: [C]=CRAP, [O]=OOT_MODULE
[  421.500108] Hardware name: Allwinner sun8i Family
[  421.504845] PC is at resolve_symbol+0xd8/0x2d0
[  421.509356] LR is at bsearch+0x2f/0x40
[  421.513154] pc : [<c0193f54>]    lr : [<c05fe853>]    psr: 30070033
[  421.519458] sp : f1f6dda8  ip : 00000007  fp : f14edc64
[  421.524720] r10: bfb9c8e7  r9 : bfb9c00c  r8 : f14ecc4c
[  421.529976] r7 : f1f6de68  r6 : bfb9a504  r5 : bfb9a240  r4 : bfc20240
[  421.536507] r3 : 7f7b4a91  r2 : 00000000  r1 : bfb9c8e7  r0 : 00000001
[  421.543040] Flags: nzCV  IRQs on  FIQs on  Mode SVC_32  ISA Thumb  Segment none
[  421.550372] Control: 50c5387d  Table: 4685c06a  DAC: 00000051
[  421.556142] Register r0 information: non-paged memory
[  421.561235] Register r1 information: 1-page vmalloc region starting at 0xbfb9c000 allocated at load_module+0x525/0x16ec
[  421.572106] Register r2 information: NULL pointer
[  421.576845] Register r3 information: non-paged memory
[  421.581903] Register r4 information: 1-page vmalloc region starting at 0xbfc20000 allocated at load_module+0x525/0x16ec
[  421.592705] Register r5 information: 1-page vmalloc region starting at 0xbfb9a000 allocated at load_module+0x525/0x16ec
[  421.603500] Register r6 information: 1-page vmalloc region starting at 0xbfb9a000 allocated at load_module+0x525/0x16ec
[  421.614295] Register r7 information: 2-page vmalloc region starting at 0xf1f6c000 allocated at kernel_clone+0x47/0x2a0
[  421.625009] Register r8 information: 3-page vmalloc region starting at 0xf14eb000 allocated at kernel_read_file+0x1e3/0x21c
[  421.636158] Register r9 information: 1-page vmalloc region starting at 0xbfb9c000 allocated at load_module+0x525/0x16ec
[  421.646953] Register r10 information: 1-page vmalloc region starting at 0xbfb9c000 allocated at load_module+0x525/0x16ec
[  421.657834] Register r11 information: 3-page vmalloc region starting at 0xf14eb000 allocated at kernel_read_file+0x1e3/0x21c
[  421.669064] Register r12 information: non-paged memory
[  421.674210] Process modprobe (pid: 1644, stack limit = 0x00f6e06f)
[  421.680399] Stack: (0xf1f6dda8 to 0xf1f6e000)
[  421.684764] dda0:                   c01932ad f14ecc4c 00000101 bfb9a240 00000000 bfb9c00c
[  421.692947] ddc0: 00000000 80a2e18a c01932ad bfc20240 f14ecc4c 0000004c 00000750 bfc2024c
[  421.701129] dde0: bfc264c4 f1f6dee8 f14edc64 c0195583 f1f6de98 00000000 00000000 c02ed345
[  421.709313] de00: c18e0378 00000000 00000001 c5450000 bfc2033c bfc20240 00000000 c0e526ac
[  421.717495] de20: c0e526f4 00000000 00000000 c1781a98 0000001c 00000001 00000000 004452c0
[  421.725677] de40: 00000000 00000000 00000000 00004004 00000000 c0322d69 00000000 80a2e18a
[  421.733860] de60: 00000000 7fffd323 6e72656b 00006c65 00000000 00000000 00000000 00000000
[  421.742042] de80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  421.750225] dea0: 00000000 80a2e18a 00001168 00000000 f14eb000 004452c0 c4a33840 c4a33840
[  421.758409] dec0: 00000000 c18e0388 004452c0 c0196043 f1f6dee4 7fffffff 00000000 00000002
[  421.766591] dee0: c5b883f8 f14eb000 f14ec037 f14eb9f0 f14eb000 00002cdc f14ed6c4 f14ed544
[  421.774774] df00: f14ec89c 00000548 00000678 00000e0c 000007ec 00000000 00000dfc 00000024
[  421.782957] df20: 00000025 0000000f 00000000 0000001c 00000000 80a2e18a 0000007d c18e0378
[  421.791139] df40: 00000001 c019632b 00000000 00000000 0113b428 c5b883f8 000a0000 c5b883f8
[  421.799321] df60: 00000000 c18e057c 00000000 00000000 f1f6df70 f1f6df70 fffffffc 80a2e18a
[  421.807505] df80: 00000006 0043f613 00000000 6120cd00 0000017b c01002a0 c5450000 0000017b
[  421.815689] dfa0: 00000000 c0100061 0043f613 00000000 00000004 004452c0 00000000 0113b560
[  421.823871] dfc0: 0043f613 00000000 6120cd00 0000017b 0113b428 0113b380 00000000 00000000
[  421.832055] dfe0: be9a5098 be9a5088 0043ff89 b6bb32d2 40070030 00000004 00000000 00000000
[  421.840233] Call trace:
[  421.840248]  resolve_symbol from load_module+0xc87/0x16ec
[  421.848199]  load_module from init_module_from_file+0x5b/0x84
[  421.853962]  init_module_from_file from sys_finit_module+0x13b/0x210
[  421.860332]  sys_finit_module from ret_fast_syscall+0x1/0x5c
[  421.866004] Exception stack(0xf1f6dfa8 to 0xf1f6dff0)
[  421.871063] dfa0:                   0043f613 00000000 00000004 004452c0 00000000 0113b560
[  421.879246] dfc0: 0043f613 00000000 6120cd00 0000017b 0113b428 0113b380 00000000 00000000
[  421.887427] dfe0: be9a5098 be9a5088 0043ff89 b6bb32d2
[  421.892488] Code: e050 681b 42b3 d04d (691a) 4294
[  421.897353] ---[ end trace 0000000000000000 ]---

[rgriebl]

I just ran into the same problem when upgrading an Armbian/bookworm Orange-PI Zero from kernel 5.15 to 6.12. Turns out that the Linux headers package for sunxi is broken for all of 6.6, 6.12 and 6.16: Module.symvers claims that the kernel exports kmalloc_caches, but checking /proc/kallsyms you can see that this symbol is clearly not exported.
You can either try to find the problem in Armbian and fix it there, or simply downgrade the kernel to 6.1: this is the oldest one still available in the archive: apt install apt install linux-headers-legacy-sunxi=24.2.1 linux-image-legacy-sunxi=24.2.1 linux-dtb-legacy-sunxi=24.2.1 . Don't forget to apt-mark hold them as well.

Please note: once the kernel panicked, a lot of things related to modules will not work anymore. You have to first uninstall pivccu-modules-dkms and then reboot, install the old kernel, reboot again and then reinstall pivccu.