Problem upgrading ncs 1.5.1 upgrade to ncs 1.9.1 failed

Hello,

I am currently using nRF52840 + NCS 1.5.1 (including zephyr 2.4)
I am using BG95/96 model meaning offloaded socket to have internet connection for leshain & lwm2m

The application was working fine until  I upgrade to NCS 1.9.1 (including zephyr 2.7) then socket failed. I can't figure out why
I am placing breakpoints in the offloading code but they are not hint.

I am reading similar topics on Github/zephyrproject-rtos and DevZone and but most off them I already tried but without success.

Any hints or help is most welcome.

Thanks in advance.

The app prf.conf

# Toolchain
CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_NANO=n
CONFIG_SIZE_OPTIMIZATIONS=y

# General system
CONFIG_REBOOT=y
CONFIG_MAIN_STACK_SIZE=2048
CONFIG_HEAP_MEM_POOL_SIZE=32768
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
CONFIG_STACK_SENTINEL=y
CONFIG_DEBUG_THREAD_INFO=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_COREDUMP=y

# Extra exception debug information
CONFIG_EXTRA_EXCEPTION_INFO=y

# Enable using the fatal error handler defined for Nordic DKs.
CONFIG_RESET_ON_FATAL_ERROR=y
CONFIG_FATAL_ERROR_LOG_LEVEL_DBG=y

# Global switch for the logger, when turned off log calls will not be compiled in.
CONFIG_LOG=y
CONFIG_LOG_DEFAULT_LEVEL=4

# Enable processing of printk messages.
CONFIG_LOG_PRINTK=y

# Enable colors in the log backend.
CONFIG_LOG_BACKEND_SHOW_COLOR=n

# Amount of buffered logs which triggers processing thread.
CONFIG_LOG_PROCESS_TRIGGER_THRESHOLD=5

# Set internal log processing thread sleep period
CONFIG_LOG_PROCESS_THREAD_SLEEP_MS=100

# Number of buffers in the pool used by log_strdup()
CONFIG_LOG_STRDUP_BUF_COUNT=128

# Stack size for the internal log processing thread
CONFIG_LOG_PROCESS_THREAD_STACK_SIZE=8192

CONFIG_I2C_LOG_LEVEL_OFF=y

# Enable timestamp formatting in the backend
CONFIG_LOG_BACKEND_FORMAT_TIMESTAMP=n

# Tracing Support (for segger systemView)
CONFIG_TRACING=n

# Console
CONFIG_UART_CONSOLE=n
CONFIG_RTT_CONSOLE=n

# Drivers
CONFIG_GPIO=y
CONFIG_I2C=y
CONFIG_ADC=y
CONFIG_PWM=y
CONFIG_NRFX_UARTE0=y
CONFIG_UART_ASYNC_API=y
CONFIG_WATCHDOG=n

# Networking
CONFIG_NETWORKING=y
CONFIG_NET_SOCKETS=y

CONFIG_NET_BUF_USER_DATA_SIZE=4
CONFIG_NET_IF_MAX_IPV4_COUNT=2

CONFIG_NET_SOCKETS_LOG_LEVEL_INF=n
CONFIG_NET_SOCKETS_LOG_LEVEL_DBG=y

# Offload Socket APIs [EXPERIMENTAL]
# Enables direct offloading of socket operations to dedicated TCP/IP hardware.
CONFIG_NET_SOCKETS_OFFLOAD=y

# Enable logging in various parts of the network stack. 
CONFIG_NET_LOG=y

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

CONFIG_NET_STATISTICS_PER_INTERFACE=y
CONFIG_NET_TC_TX_COUNT=1
CONFIG_NET_TC_RX_COUNT=1
CONFIG_NET_IF_LOG_LEVEL_DBG=y
CONFIG_NET_IF_LOG_LEVEL_INF=n

CONFIG_NET_ROUTE_LOG_LEVEL_INF=n
CONFIG_NET_ROUTE_LOG_LEVEL_DBG=y

CONFIG_NET_CONN_LOG_LEVEL_INF=n
CONFIG_NET_CONN_LOG_LEVEL_DBG=y

CONFIG_NET_CORE_LOG_LEVEL_DBG=y
CONFIG_NET_CORE_LOG_LEVEL_INF=n

CONFIG_NET_BUF_LOG_LEVEL_DBG=y
CONFIG_NET_BUF_LOG_LEVEL_INF=n

CONFIG_NET_UDP=y
CONFIG_NET_UDP_LOG_LEVEL_DBG=y
CONFIG_NET_UDP_LOG_LEVEL_INF=n

CONFIG_NET_PKT_RX_COUNT=4
CONFIG_NET_PKT_TX_COUNT=4
CONFIG_NET_PKT_LOG_LEVEL_DBG=y
CONFIG_NET_PKT_LOG_LEVEL_INF=n
CONFIG_NET_PKT_TXTIME_STATS_DETAIL=y
CONFIG_NET_PKT_RXTIME_STATS_DETAIL=y

# Settings
CONFIG_FLASH=y
CONFIG_FLASH_MAP=y
CONFIG_SETTINGS=y
CONFIG_SETTINGS_NVS=y
CONFIG_NVS=y
CONFIG_MPU_ALLOW_FLASH_WRITE=y

# LwM2M, OMA LWM2M protocol stack.
CONFIG_LWM2M=y

# Enable DTLS support in the LwM2M client.
CONFIG_LWM2M_DTLS_SUPPORT=y

# Enable TCP TLS socket option support [EXPERIMENTAL]
CONFIG_NET_SOCKETS_SOCKOPT_TLS=y

# Enable DTLS socket support [EXPERIMENTAL]
CONFIG_NET_SOCKETS_ENABLE_DTLS=y

CONFIG_LWM2M_TRACE_ENGINE=Y

# Enable LOG function trace support in file LWM2M client.
CONFIG_LWM2M_TRACE_CLIENT=y

# Enable LOG function trace support in file LWM2M rd client.
CONFIG_LWM2M_TRACE_RD_CLIENT=y

# support for LWM2M client bootstrap/registration state machine"
CONFIG_LWM2M_RD_CLIENT_SUPPORT=y

# Enabling this setting allows the RD client to support bootstrap mode.
CONFIG_LWM2M_RD_CLIENT_SUPPORT_BOOTSTRAP=y

# Maximum length of client endpoint name
CONFIG_LWM2M_RD_CLIENT_ENDPOINT_NAME_MAX_LENGTH=64

# Specify maximum number of registration retries
CONFIG_LWM2M_RD_CLIENT_MAX_RETRIES=2

# LWM2M engine default server connection lifetime
CONFIG_LWM2M_ENGINE_DEFAULT_LIFETIME=900

# LWM2M Registration Update transmission time before timeout
CONFIG_LWM2M_SECONDS_TO_UPDATE_EARLY=30

# Set the transport binding to UDP with Queue Mode (UQ).
CONFIG_LWM2M_QUEUE_MODE_ENABLED=n

# LWM2M CoAP block-wise transfer size ( Possible values: 64, 128, 256, 512 and 1024.)
CONFIG_LWM2M_COAP_BLOCK_SIZE=1024

# Base length of the random generated initial ACK timeout in ms.
CONFIG_COAP_INIT_ACK_TIMEOUT_MS=6000

# Enable DNS support in the LWM2M client.
CONFIG_LWM2M_DNS_SUPPORT=y

# LWM2M engine max. pending objects.
CONFIG_LWM2M_ENGINE_MAX_PENDING=10

# LWM2M engine max. reply objects.
CONFIG_LWM2M_ENGINE_MAX_REPLIES=10

# CONFIG_LWM2M_LOG_LEVEL_INF=y
CONFIG_LWM2M_LOG_LEVEL_DBG=y

# Include support for LWM2M Connectivity Monitoring Object (ID 4)
CONFIG_LWM2M_CONN_MON_OBJ_SUPPORT=y

# Connectivity monitor object version 1.0 (default)
CONFIG_LWM2M_CONNMON_OBJECT_VERSION_1_0=y

# Connectivity monitor object version 1.2 [EXPERIMENTAL]
CONFIG_LWM2M_CONNMON_OBJECT_VERSION_1_2=n

# Software management object support.
CONFIG_LWM2M_SWMGMT_OBJ_SUPPORT=n

# Maximum # of device power source records.
# CONFIG_LWM2M_DEVICE_PWRSRC_MAX=5

# Maximum # of LWM2M attributes.
CONFIG_LWM2M_NUM_ATTR=10

# Location object support.
CONFIG_LWM2M_LOCATION_OBJ_SUPPORT=n

# Offload TLS socket calls to the offloaded sockets.
CONFIG_NET_SOCKETS_OFFLOAD_TLS=n

# Maximum number of TLS/DTLS contexts.
CONFIG_NET_SOCKETS_TLS_MAX_CONTEXTS=4


# mbed TLS Support.
CONFIG_MBEDTLS=y

# Enable support for TLS 1.2 (DTLS 1.2)
CONFIG_MBEDTLS_TLS_VERSION_1_2=y

# Max payload size for TLS protocol message.
CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=1500

# Enable the Counter with CBC-MAC (CCM) mode for 128-bit block cipher.
CONFIG_MBEDTLS_CIPHER_CCM_ENABLED=y

# Enable the RSA-only based ciphersuite modes.
CONFIG_MBEDTLS_KEY_EXCHANGE_RSA_ENABLED=n

# Enable the PSK based ciphersuite modes.
CONFIG_MBEDTLS_KEY_EXCHANGE_PSK_ENABLED=y




The log of ncs1.5.1
[00:00:30.937,591] inf> Modem: Received response: OK
[00:00:30.937,622] inf> Modem: Sending: AT+QLTS=1
[00:00:31.057,617] inf> Modem: Received URC: +QLTS: "2022/04/13,13:57:25+08,1"
[00:00:31.057,861] inf> Modem: Time: +QLTS: "2022/04/13,13:57:25+08,1" -> 257698037761
[00:00:31.057,891] inf> Modem: Received response: OK
[00:00:31.598,358] inf> Modem: Processing modem command: DRX settings update
[00:00:31.598,480] inf> Modem: Sending: AT+QPTWEDRXS=0,4,"1111","1111"
[00:00:31.687,133] inf> net_lwm2m_rd_client: Bootstrap started with endpoint 'urn:cust:xxx.xxx.xxx.xxx' with client lifetime 0
[00:00:31.687,408] inf> Modem: Found free socket: 0
[00:00:31.687,438] inf> Modem: Socket created. <ID, FD> : <0, 1>
[00:00:31.687,500] dbg> Modem.QueueModemCommand: Queued command: Socket open
[00:00:31.687,561] dbg> Modem.HandleCommand: Received command
[00:00:31.718,505] inf> Modem: Received response: OK
[00:00:31.718,505] inf> Modem: e-I-DRX settings updated
[00:00:31.818,603] inf> Modem: Processing modem command: GPS enable
[00:00:31.818,634] inf> Modem: Sending: AT+QGPS=1


The log of ncs 1.9.1
[00:14:20.580,596] <inf> Modem: Received response: OK
[00:14:20.580,749] <inf> Modem: Sending: AT+QLTS=1
[00:14:20.681,213] <inf> Modem: Received URC: +QLTS: "2022/07/05,08:01:35+08,1"
[00:14:20.681,579] <inf> Modem: Time: +QLTS: "2022/07/05,08:01:35+08,1" -> 317780335263746
[00:14:20.681,701] <inf> Modem: Received response: OK
[00:14:20.782,196] <inf> Modem: Processing modem command: DRX settings update
[00:14:20.782,623] <inf> Modem: Sending: AT+QPTWEDRXS=0,4,"1111","0000"
[00:14:20.787,200] <inf> Modem: Received response: OK
[00:14:20.787,261] <inf> Modem: e-I-DRX settings updated
[00:14:20.891,113] <dbg> net_lwm2m_engine.lwm2m_engine_get: path:0/0/1, buf:0x2000eb27, buflen:1
[00:14:20.891,174] <inf> net_lwm2m_rd_client: Bootstrap started with endpoint 'urn:cust:xxx.xxx.xxx.xxx' with client lifetime 0
[00:14:20.891,235] <dbg> net_lwm2m_engine.lwm2m_parse_peerinfo: Parse url: coaps://xx.yy.zz.aa:9999
[00:14:20.892,578] <dbg> net_lwm2m_rd_client.sm_send_bootstrap_registration: Register ID with bootstrap server as 'ep=urn:cust:-89882390000226837246'
[00:14:24.468,231] <err> os: SPSEL in thread mode does not indicate PSP
[00:14:24.468,231] <err> os: ***** BUS FAULT *****
[00:14:24.468,261] <err> os:   Precise data bus error


Toolchain:
Windows,
NCS connect 151/191

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