GSM_MUX - FATAL ERROR - uart_mux_workq

[ivonalo]

Hy everybody, I am working with Thales PLS83-W modem and use the CONFIG_GSM_MUX=y for muxing the PPP interface and the AT commands.

I am able to send the AT commands to the modem and get a response. To get the PPP network interface up I use the CONFIG_MODEM_GSM_PPP=y to get PPP and everything works fine after the modem is registered to the network I get an IP address and PPP interface is up and running. But shortly after that everything crashes and I geet a BUS FAULT ERROR
I guess I should increase some stack size, but not sure which one.

This is my log output.

** Booting Zephyr OS build 7e22bfaff313  ***
I: Starting bootloader
I: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Scratch: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Boot source: primary slot
I: Swap type: none
I: Bootloader chainload address offset: 0x10000
I: Jumping to the first image slot
[00:00:00.000,000] <dbg> net_ppp: ppp_driver_init: [0x200037c8] dev 0x806991c
[00:00:00.007,000] <dbg> net_tcp: net_tcp_init: (main): Workq started. Thread ID: 0x20001be8
[00:00:00.007,000] <dbg> net_if: net_if_init: (main): 
[00:00:00.007,000] <dbg> net_if: init_iface: (main): On iface 0x20000d44
[00:00:00.007,000] <dbg> net_ppp: ppp_iface_init: [0x200037c8] iface 0x20000d44
[00:00:00.007,000] <dbg> net_l2_ppp: net_ppp_init: (main): Initializing PPP L2 0x20003598 for iface 0x20000d44
[00:00:00.007,000] <dbg> net_l2_ppp: ppp_startup: (sysworkq): PPP 0x20003598 startup for interface 0x20000d44
[00:00:00.007,000] <dbg> net_l2_ppp: ipcp_init: (sysworkq): proto IPCP (0x8021) fsm 0x200036b0
[00:00:00.007,000] <dbg> net_l2_ppp: lcp_init: (sysworkq): proto LCP (0xc021) fsm 0x200035e0
[00:00:00.007,000] <dbg> net_if: net_if_post_init: (main): 
*** Booting Zephyr OS build 7e22bfaff313  ***

[00:00:00.922,000] <dbg> conn_mgr: conn_mgr_handler: (conn_mgr): Connection Manager started
[00:00:00.922,000] <dbg> net_l2_ppp: tx_handler: (tx_handler_thread): PPP TX started
020395 [INFO] uart_mux.cpp:170:[StartUartMux] | Found dev GSM_2
020507 [INFO] uart_mux.cpp:226:[WriteMux] | ATE0 Response char: [ A T E 0 ]
020536 [INFO] uart_mux.cpp:237:[WriteMux] | AT+CIMI Response char: [ ]
020543 [INFO] uart_mux.cpp:241:[WriteMux] | AT+CIMI Response char: [ 9 0 1 4 0 5 0 0 1 9 2 9 6 7 4 ]
[00:00:17.394,000] <dbg> net_l2_ppp: ppp_change_state_debug: (rx_q[0]): [IPCP/0x200036b0] state ACK_SENT (8) => OPENED (9) (fsm_recv_configure_ack():706)
--- 462 messages dropped ---
[00:00:17.394,000] <dbg> net_if: net_if_ipv4_addr_add: (rx_q[0]): [0] interface 0x20000d44 address 10.211.198.211 type MANUAL added
[00:00:17.394,000] <dbg> net_l2_ppp: ipcp_up: (rx_q[0]): PPP up with address 10.211.198.211
[00:00:17.394,000] <dbg> net_l2_ppp: ppp_change_phase_debug: (rx_q[0]): [0x20003598] phase NETWORK (3) => RUNNING (4) (ppp_network_up():22)
[00:00:17.394,000] <dbg> net_l2_ppp: ppp_network_up: (rx_q[0]): [0x20003598] Proto IPv4 (0x0021) up (1)
[00:00:17.394,000] <dbg> net_l2_ppp: ipcp_up: (rx_q[0]): [IPCP/0x200036b0] Current state OPENED (9)
[00:00:17.394,000] <dbg> conn_mgr: conn_mgr_ipv4_events_handler: (net_mgmt): IPv4 event 3758358529 received on iface 1 (0x20000d44)
[00:00:17.394,000] <dbg> conn_mgr: conn_mgr_ipv4_events_handler: (net_mgmt): Iface index 0
[00:00:17.394,000] <dbg> conn_mgr: conn_mgr_ipv4_status: (conn_mgr): IPv4 connected on iface index 1
[00:00:17.394,000] <dbg> conn_mgr: conn_mgr_notify_status: (conn_mgr): Iface 1 (0x20000d44) connected
[00:00:47.226,000] <err> os: ***** BUS FAULT *****
[00:00:47.226,000] <err> os:   Precise data bus error
[00:00:47.226,000] <err> os:   BFAR Address: 0x8303228
[00:00:47.226,000] <err> os: r0/a1:  0x08303220  r1/a2:  0x00000023  r2/a3:  0x00000100
[00:00:47.226,000] <err> os: r3/a4:  0x00000000 r12/ip:  0x0000001b r14/lr:  0x080557ab
[00:00:47.226,000] <err> os:  xpsr:  0x61000000
[00:00:47.226,000] <err> os: Faulting instruction address (r15/pc): 0x08054c12
[00:00:47.226,000] <err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
[00:00:47.226,000] <err> os: Current thread: 0x20001e28 (uart_mux_workq)
[00:00:47.400,000] <err> os: Halting system

My prj.conf file:

# C Library
CONFIG_NEWLIB_LIBC=y

# C++ configuration
CONFIG_CPLUSPLUS=y
CONFIG_LIB_CPLUSPLUS=y
CONFIG_STD_CPP17=y

# Kernel options
CONFIG_MAIN_STACK_SIZE=12288
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096
CONFIG_ISR_STACK_SIZE=8192

# Other thread stack sizes. These max sizes are calculated so that the stack
# usage for each thread is at around 80% (last measurement made: 1.9.2021.).
CONFIG_IDLE_STACK_SIZE=64
CONFIG_LOG_PROCESS_THREAD_STACK_SIZE=768

# UART configuration
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_RING_BUFFER=y
CONFIG_UART_USE_RUNTIME_CONFIGURE=y

# console output
# make sure CONFIG_CONSOLE and CONFIG_UART_CONSOLE is enabled
# CONFIG_CONSOLE=n
# CONFIG_UART_CONSOLE=n
CONFIG_PRINTK=y
CONFIG_STDOUT_CONSOLE=y # std::cout and printf output...

# RTC configuration
CONFIG_I2C=y
CONFIG_SENSOR=y
CONFIG_COUNTER=y
CONFIG_COUNTER_M41T62=y

# battery charger
CONFIG_BQ24155=y
CONFIG_SENSOR_LOG_LEVEL_WRN=y

# battery fuel gauge configuration
CONFIG_BQ274XX=y
CONFIG_BQ274XX_TRIGGER=y
CONFIG_BQ274XX_BATTERY_LOW_ENABLE=y

# protobuf library
CONFIG_NANOPB=y

# Enable Power management API which some of the drivers use (for example 
# bq27421).
CONFIG_PM_DEVICE=y

# This enables sys_reboot() function.
CONFIG_REBOOT=y

# Thread analyzer options
CONFIG_LOG=y
CONFIG_THREAD_ANALYZER=y
CONFIG_THREAD_ANALYZER_USE_PRINTK=y
CONFIG_THREAD_NAME=y

# MCP98243 Temperature Sensor
CONFIG_MCP98243=y
CONFIG_I2C_STM32_INTERRUPT=n

# MCP98243 EEPROM
CONFIG_EEPROM=y
CONFIG_EEPROM_MCP98243=y

# Enable mcumgr.
CONFIG_MCUMGR=y
CONFIG_MCUMGR_SMP_UART=y
CONFIG_MCUMGR_LOG_LEVEL_DBG=y
CONFIG_MCUMGR_CMD_OS_MGMT=y
CONFIG_MCUMGR_CMD_IMG_MGMT=y
CONFIG_IMG_MGMT_VERBOSE_ERR=y
CONFIG_MCUMGR_BUF_SIZE=1024
CONFIG_MCUMGR_SMP_UART_MTU=896
CONFIG_IMG_MGMT_UL_CHUNK_SIZE=896

CONFIG_TASK_WDT_HW_FALLBACK=n
CONFIG_TASK_WDT=y
CONFIG_TASK_WDT_CHANNELS=5


CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_MCUBOOT_SIGNATURE_KEY_FILE="greyp-zephyr-packages/.secrets/cyklaer_mcuboot_key.pem"

# Flash
CONFIG_FLASH_LOG_LEVEL_WRN=y
CONFIG_FLASH=y
CONFIG_FLASH_MAP=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_SOC_FLASH_STM32=y

# PWM
CONFIG_PWM=y
CONFIG_PWM_LOG_LEVEL_WRN=y
CONFIG_NETWORKING=y
CONFIG_NET_SOCKETS=y
CONFIG_SOCKS=y
CONFIG_NET_TCP=y
CONFIG_NET_UDP=y
CONFIG_NET_ARP=y
CONFIG_NET_DHCPV4=n

# Network drivers buffers
CONFIG_NET_PKT_RX_COUNT=640
CONFIG_NET_PKT_TX_COUNT=640
CONFIG_NET_BUF_RX_COUNT=640
CONFIG_NET_BUF_TX_COUNT=640

CONFIG_NET_IF_MAX_IPV4_COUNT=2
CONFIG_NET_DEFAULT_IF_PPP=y
CONFIG_NET_STATISTICS=y
CONFIG_NET_PPP_LOG_LEVEL_DBG=y
CONFIG_NET_L2_PPP_LOG_LEVEL_DBG=y

CONFIG_NET_L2_ETHERNET=n
# Enable MQTT Lib support
CONFIG_MQTT_LIB=y
CONFIG_MQTT_KEEPALIVE=30
CONFIG_NETWORKING=y
CONFIG_DEBUG_INFO=y

CONFIG_NET_CONFIG_SETTINGS=n
# Configure static addresses
CONFIG_TEST_RANDOM_GENERATOR=y
CONFIG_INIT_STACKS=y
CONFIG_NET_SHELL=y
CONFIG_GSM_PPP_AUTOSTART=y
# Packet raw socket configuration to allow for raw sockets bound to iface
CONFIG_NET_SOCKETS_PACKET=y

# Enable Logging support
CONFIG_NET_LOG=y
# CONFIG_NET_TCP_LOG_LEVEL_DBG=y
CONFIG_NET_SOCKETS_LOG_LEVEL_DBG=y
CONFIG_MQTT_LOG_LEVEL_DBG=y
CONFIG_NET_IF_LOG_LEVEL_DBG=y
CONFIG_NET_CONFIG_LOG_LEVEL_DBG=y
CONFIG_NET_CONNECTION_MANAGER_LOG_LEVEL_DBG=y
CONFIG_NET_MGMT_EVENT_INFO=y
CONFIG_DNS_RESOLVER_LOG_LEVEL_DBG=y
CONFIG_NET_CONTEXT_LOG_LEVEL_DBG=y

# UART support
CONFIG_SERIAL=y

# GSM modem support
CONFIG_MODEM=y
CONFIG_MODEM_GSM_PPP=y
CONFIG_MODEM_GSM_APN="internet.m2mportal.de"
CONFIG_MODEM_SHELL=y

# PPP networking support
CONFIG_NET_DRIVERS=y
CONFIG_NET_PPP=y
CONFIG_NET_L2_PPP=y
CONFIG_NET_NATIVE=y
CONFIG_NETWORKING=y

# IPv4 enables PPP IPCP support
CONFIG_NET_IPV4=y
CONFIG_NET_IPV6=n

# Network management events
CONFIG_NET_CONNECTION_MANAGER=y
CONFIG_GSM_MUX=y
CONFIG_UART_MUX=y
CONFIG_NET_L2_PPP_OPTION_MRU=y
CONFIG_GSM_MUX_MRU_DEFAULT_LEN=512
CONFIG_GSM_MUX_MRU_MAX_LEN=512
CONFIG_MODEM_GSM_RX_STACK_SIZE=4096
CONFIG_UART_MUX_RX_STACK_SIZE=4096
CONFIG_MODEM_GSM_WORKQ_STACK_SIZE=4096

CONFIG_UART_MUX_RINGBUF_SIZE=512

[CreativeIndustryAg]

I have the same problem.