[BUG] UDP/userfs: userfs operations do not complete

[liamHowatt]

Description / Steps to reproduce the issue

It's related to UDP changes.

#17699 (comment)

sim:userfs defconfig.

nsh> userfs
nsh> ls mnt/ufstest

It gets stuck.

I could fix it with this change.

diff --git a/net/udp/udp_devpoll.c b/net/udp/udp_devpoll.c
index 4ff4994c4e..e35bc78934 100644
--- a/net/udp/udp_devpoll.c
+++ b/net/udp/udp_devpoll.c
@@ -103,7 +103,7 @@ void udp_poll(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn)
 
       /* If the application has data to send, setup the UDP/IP header */
 
-      if (dev->d_len > 0)
+      if (dev->d_sndlen > 0)
         {
           udp_send(dev, conn);
           return;
diff --git a/net/udp/udp_send.c b/net/udp/udp_send.c
index 8b59be7fb2..f4f4539f99 100644
--- a/net/udp/udp_send.c
+++ b/net/udp/udp_send.c
@@ -155,7 +155,7 @@ void udp_send(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn)
 
   ninfo("UDP payload: %d (%d) bytes\n", dev->d_sndlen, dev->d_len);
 
-  if (dev->d_len > 0)
+  if (dev->d_sndlen > 0)
     {
 #ifdef CONFIG_NET_IPv4
 #ifdef CONFIG_NET_IPv6

devif_send.c sets d_sndlen while d_len remains 0.

nuttx/net/devif/devif_send.c

Line 116 in 0625b7a

dev->d_sndlen = len;

Is devif_send.c wrong for setting d_sndlen instead of d_len?

On which OS does this issue occur?

[OS: Linux]

What is the version of your OS?

Ubuntu 22.04

NuttX Version

4d52550

Issue Architecture

[Arch: simulator]

Issue Area

[Area: Networking], [Area: File System]

Host information

NuttX sim on x86-64 Linux Ubuntu 22.04 Docker container.

file sysinfo.h not exists
NuttX CFLAGS:
--g
-fno-omit-frame-pointer
-fno-optimize-sibling-calls
-fsanitize=address
-fsanitize-address-use-after-scope
-fsanitize=pointer-compare
-fsanitize=pointer-subtract
-fno-common
-fvisibility=hidden
-ffunction-sections
-fdata-sections
-Wall
-Wstrict-prototypes
-Wshadow
-Wundef
-Wno-attributes
-Wno-unknown-pragmas
-fno-pic
-mcmodel=medium
-isystem /root/nuttxspace/nuttx/include
-D__NuttX__
-U_AIX
-U_WIN32
-U__APPLE__
-U__FreeBSD__
-U__NetBSD__
-U__linux__
-U__sun__
-U__unix__
-U__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__

NuttX CXXFLAGS:
--g
-fno-omit-frame-pointer
-fno-optimize-sibling-calls
-fsanitize=address
-fsanitize-address-use-after-scope
-fsanitize=pointer-compare
-fsanitize=pointer-subtract
-fno-common
-fvisibility=hidden
-ffunction-sections
-fdata-sections
-Wall
-Wshadow
-Wundef
-Wno-attributes
-Wno-unknown-pragmas
-nostdinc++
-fno-exceptions
-fcheck-new
-fno-rtti
-fno-pic
-mcmodel=medium
-isystem /root/nuttxspace/nuttx/include/cxx
-isystem /root/nuttxspace/nuttx/include
-D__NuttX__
-U_AIX
-U_WIN32
-U__APPLE__
-U__FreeBSD__
-U__NetBSD__
-U__linux__
-U__sun__
-U__unix__
-U__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__

NuttX LDFLAGS:
-Wl--gc-sections
-Wl-Ttext-segment=0x40000000
-Wl-Map=/root/nuttxspace/nuttx/nuttx.map
-Wl-Map=/root/nuttxspace/nuttx/nuttx.map
-Wl-no-pie

NuttX configuration options:
CONFIG_HOST_LINUX=y
CONFIG_APPS_DIR=../apps
CONFIG_BASE_DEFCONFIG=\sim:userfs
CONFIG_BUILD_FLAT=y
CONFIG_OUTPUT_STRIP_PATHS=y
CONFIG_ARCH_HAVE_MATH_H=y
CONFIG_ARCH_HAVE_SETJMP=y
CONFIG_ARCH_SETJMP_H=y
CONFIG_ARCH_NONE_DEBUG_H=y
CONFIG_FORTIFY_SOURCE=0
CONFIG_ASSERTIONS_FILENAME=y
CONFIG_DEBUG_ALERT=y
CONFIG_DEBUG_FEATURES=y
CONFIG_DEBUG_ERROR=y
CONFIG_DEBUG_WARN=y
CONFIG_DEBUG_ASSERTIONS=y
CONFIG_DEBUG_ASSERTIONS_FILENAME=y
CONFIG_DEBUG_FS=y
CONFIG_DEBUG_FS_ERROR=y
CONFIG_DEBUG_FS_WARN=y
CONFIG_ARCH_HAVE_STACKCHECK=y
CONFIG_STACKCHECK_MARGIN=-1
CONFIG_STACK_USAGE_WARNING=0
CONFIG_DEBUG_SYMBOLS=y
CONFIG_DEBUG_SYMBOLS_LEVEL=-g
CONFIG_FRAME_POINTER=y
CONFIG_ARCH_HAVE_CUSTOMOPT=y
CONFIG_DEBUG_NOOPT=y
CONFIG_LTO_NONE=y
CONFIG_DEBUG_OPT_UNUSED_SECTIONS=y
CONFIG_DEBUG_LINK_MAP=y
CONFIG_CCACHE=y
CONFIG_ARCH_SIM=y
CONFIG_ARCH=\sim
CONFIG_ARCH_CHIP=\sim
CONFIG_HOST_X86_64=y
CONFIG_SIM_TOOLCHAIN_GCC=y
CONFIG_SIM_ASAN=y
CONFIG_SIM_X8664_SYSTEMV=y
CONFIG_SIM_WALLTIME_SLEEP=y
CONFIG_SIM_LOOP_INTERVAL=10
CONFIG_SIM_STACKSIZE_ADJUSTMENT=65536
CONFIG_SIM_OFFLOAD_NUM_BUFFERS=2
CONFIG_SIM_OFFLOAD_BUFFER_NUMBYTES=32767
CONFIG_SIM_UART_DMA=y
CONFIG_SIM_UART_NUMBER=0
CONFIG_SIM_CUSTOM_DATA_SECTION=\
CONFIG_ARCH_TOOLCHAIN_GNU=y
CONFIG_ARCH_TOOLCHAIN_GCC=y
CONFIG_ARCH_64BIT=y
CONFIG_ARCH_HAVE_TEXT_HEAP=y
CONFIG_ARCH_HAVE_MULTICPU=y
CONFIG_ARCH_HAVE_FORK=y
CONFIG_ARCH_HAVE_POWEROFF=y
CONFIG_ARCH_HAVE_TESTSET=y
CONFIG_ARCH_HAVE_RTC_SUBSECONDS=y
CONFIG_ARCH_HAVE_SYSCALL_HOOKS=y
CONFIG_ARCH_HAVE_BACKTRACE=y
CONFIG_ARCH_HAVE_CPUINFO=y
CONFIG_ARCH_CPUINFO_FREQ_KHZ=0
CONFIG_ARCH_HAVE_TCBINFO=y
CONFIG_BOARD_LOOPSPERMSEC=0
CONFIG_BOOT_RUNFROMEXTSRAM=y
CONFIG_RAM_START=0x0
CONFIG_RAM_SIZE=0
CONFIG_ARCH_BOARD_SIM=y
CONFIG_ARCH_BOARD=\sim
CONFIG_ARCH_HAVE_BUTTONS=y
CONFIG_ARCH_HAVE_IRQBUTTONS=y
CONFIG_BOARD_CRASHDUMP_NONE=y
CONFIG_BOARDCTL=y
CONFIG_BOARDCTL_POWEROFF=y
CONFIG_BOARDCTL_MKRD=y
CONFIG_BOARD_MEMORY_RANGE=\
CONFIG_DISABLE_OS_API=y
CONFIG_ARCH_HAVE_TICKLESS=y
CONFIG_USEC_PER_TICK=10000
CONFIG_TIMER_ADJUST_USEC=0
CONFIG_ARCH_HAVE_TIMEKEEPING=y
CONFIG_START_YEAR=2008
CONFIG_START_MONTH=6
CONFIG_START_DAY=1
CONFIG_PREALLOC_TIMERS=8
CONFIG_IRQ_NWORKS=8
CONFIG_IRQ_WORK_SECTION=\
CONFIG_IRQ_WORK_STACKSIZE=2048
CONFIG_INIT_ENTRY=y
CONFIG_INIT_ARGS=\
CONFIG_INIT_STACKSIZE=2048
CONFIG_INIT_PRIORITY=100
CONFIG_INIT_ENTRYPOINT=\nsh_main
CONFIG_INIT_ENTRYNAME=\nsh_main
CONFIG_ETC_ROMFS=y
CONFIG_ETC_ROMFSMOUNTPT=/etc
CONFIG_ETC_ROMFSDEVNO=1
CONFIG_ETC_ROMFSSECTSIZE=64
CONFIG_ETC_FATDEVNO=2
CONFIG_ETC_FATSECTSIZE=512
CONFIG_ETC_FATNSECTORS=1024
CONFIG_ETC_FATMOUNTPT=/tmp
CONFIG_RR_INTERVAL=0
CONFIG_TASK_NAME_SIZE=31
CONFIG_SCHED_HAVE_PARENT=y
CONFIG_SCHED_WAITPID=y
CONFIG_PTHREAD_MUTEX_ROBUST=y
CONFIG_PTHREAD_MUTEX_DEFAULT_PRIO_NONE=y
CONFIG_SCHED_CPULOAD_NONE=y
CONFIG_SCHED_CPULOAD_TICKSPERSEC=100
CONFIG_SCHED_PROFILE_TICKSPERSEC=1000
CONFIG_SCHED_STACK_RECORD=0
CONFIG_DEV_CONSOLE=y
CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=8
CONFIG_FILE_STREAM=y
CONFIG_SIG_PREALLOC_ACTIONS=4
CONFIG_SIG_ALLOC_ACTIONS=1
CONFIG_SIG_PREALLOC_IRQ_ACTIONS=8
CONFIG_PREALLOC_MQ_MSGS=8
CONFIG_PREALLOC_MQ_IRQ_MSGS=8
CONFIG_MQ_MAXMSGSIZE=32
CONFIG_SCHED_WORKQUEUE=y
CONFIG_SCHED_HPWORK=y
CONFIG_SCHED_HPNTHREADS=1
CONFIG_SCHED_HPWORKPRIORITY=224
CONFIG_SCHED_HPWORKSTACKSIZE=2048
CONFIG_SCHED_LPWORK=y
CONFIG_SCHED_LPNTHREADS=1
CONFIG_SCHED_LPWORKPRIORITY=100
CONFIG_SCHED_LPWORKSTACKSIZE=2048
CONFIG_DEFAULT_TASK_STACKSIZE=2048
CONFIG_IDLETHREAD_STACKSIZE=4096
CONFIG_PTHREAD_STACK_MIN=256
CONFIG_PTHREAD_STACK_DEFAULT=2048
CONFIG_PTHREAD_GUARDSIZE_DEFAULT=0
CONFIG_PID_INITIAL_COUNT=16
CONFIG_DEV_LOOP=y
CONFIG_ONESHOT=y
CONFIG_ONESHOT_COUNT=y
CONFIG_ALARM_ARCH=y
CONFIG_BCH=y
CONFIG_BCH_BUFFER_ALIGNMENT=0
CONFIG_DEV_NULL=y
CONFIG_DEV_ZERO=y
CONFIG_DEV_OPTEE_NONE=y
CONFIG_DRVR_MKRD=y
CONFIG_NETDEVICES=y
CONFIG_MDIO_BUS=y
CONFIG_PIPES=y
CONFIG_DEV_PIPE_MAXSIZE=65535
CONFIG_DEV_PIPE_SIZE=1024
CONFIG_DEV_FIFO_SIZE=1024
CONFIG_DEV_PIPE_VFS_PATH=/var/pipe
CONFIG_DEV_PIPE_NPOLLWAITERS=4
CONFIG_ARCH_HAVE_SERIAL_TERMIOS=y
CONFIG_SERIAL=y
CONFIG_SERIAL_CONSOLE=y
CONFIG_SERIAL_NPOLLWAITERS=4
CONFIG_SERIAL_IFLOWCONTROL=y
CONFIG_SERIAL_TXDMA=y
CONFIG_SERIAL_RXDMA=y
CONFIG_SYSLOG=y
CONFIG_SYSLOG_DEFAULT_MASK=0xff
CONFIG_SYSLOG_CRLF=y
CONFIG_SYSLOG_MAX_CHANNELS=1
CONFIG_SYSLOG_DEVPATH=/dev/ttyS1
CONFIG_SYSLOG_DEFAULT=y
CONFIG_ARCH_HAVE_NET=y
CONFIG_ARCH_HAVE_NETDEV_STATISTICS=y
CONFIG_NET_READAHEAD=y
CONFIG_NET=y
CONFIG_NET_DEFAULT_MIN_PORT=4096
CONFIG_NET_DEFAULT_MAX_PORT=32000
CONFIG_NET_GUARDSIZE=2
CONFIG_NET_LL_GUARDSIZE=0
CONFIG_NET_RECV_BUFSIZE=0
CONFIG_NET_LOOPBACK=y
CONFIG_NET_LOOPBACK_PKTSIZE=0
CONFIG_NET_IPv4=y
CONFIG_NET_IPFORWARD_ALLOC_STRUCT=1
CONFIG_NET_PREALLOC_DEVIF_CALLBACKS=16
CONFIG_NET_ALLOC_DEVIF_CALLBACKS=0
CONFIG_NET_IPV4_CHECKSUMS=y
CONFIG_NET_LOCAL=y
CONFIG_NET_LOCAL_VFS_PATH=/var/run
CONFIG_NET_LOCAL_STREAM=y
CONFIG_NET_LOCAL_DGRAM=y
CONFIG_NET_UDP=y
CONFIG_NET_UDP_PREALLOC_CONNS=8
CONFIG_NET_UDP_ALLOC_CONNS=0
CONFIG_NET_UDP_NPOLLWAITERS=1
CONFIG_NET_ICMP=y
CONFIG_NET_ICMP_PMTU_ENTRIES=0
CONFIG_NET_ICMP_CHECKSUMS=y
CONFIG_NET_IGMP_CHECKSUMS=y
CONFIG_NET_SNOOP_BUFSIZE=4096
CONFIG_NET_RECV_PACK=y
CONFIG_FS_NEPOLL_DESCRIPTORS=8
CONFIG_FS_LOCK_BUCKET_SIZE=0
CONFIG_SENDFILE_BUFSIZE=512
CONFIG_FS_BACKTRACE=0
CONFIG_FS_MQUEUE_VFS_PATH=/var/mqueue
CONFIG_FS_MQUEUE_NPOLLWAITERS=4
CONFIG_FS_ANONMAP=y
CONFIG_FS_FAT=y
CONFIG_FAT_LCNAMES=y
CONFIG_FAT_LFN=y
CONFIG_FAT_MAXFNAME=32
CONFIG_FAT_LFN_ALIAS_TRAILCHARS=0
CONFIG_FS_ROMFS=y
CONFIG_FS_ROMFS_CACHE_NODE=y
CONFIG_FS_ROMFS_CACHE_FILE_NSECTORS=1
CONFIG_FS_PROCFS=y
CONFIG_FS_USERFS=y
CONFIG_NXFONTS_PACKEDMSFIRST=y
CONFIG_MM_CUSTOMIZE_MANAGER=y
CONFIG_MM_DEFAULT_ALIGNMENT=8
CONFIG_MM_NODE_GUARDSIZE=0
CONFIG_MM_REGIONS=1
CONFIG_MM_MAP_COUNT_MAX=1024
CONFIG_MM_BACKTRACE=-1
CONFIG_MM_FREE_DELAYCOUNT_MAX=0
CONFIG_MM_HEAP_BIGGEST_COUNT=30
CONFIG_MM_HEAP_MEMPOOL_THRESHOLD=-1
CONFIG_MM_IOB=y
CONFIG_IOB_NBUFFERS=24
CONFIG_IOB_BUFSIZE=196
CONFIG_IOB_ALIGNMENT=4
CONFIG_IOB_SECTION=\
CONFIG_IOB_NCHAINS=24
CONFIG_IOB_THROTTLE=0
CONFIG_PATH_INITIAL=/bin
CONFIG_BINFMT_ELF_RELOCATABLE=y
CONFIG_STDIO_BUFFER_SIZE=64
CONFIG_STDIO_LINEBUFFER=y
CONFIG_NUNGET_CHARS=2
CONFIG_LIBC_LONG_LONG=y
CONFIG_ARCH_LOWPUTC=y
CONFIG_LIBC_RAND_ORDER=1
CONFIG_LIBC_HOMEDIR=/
CONFIG_LIBC_TMPDIR=/tmp
CONFIG_LIBC_MAX_TMPFILE=32
CONFIG_LIBC_MAX_EXITFUNS=1
CONFIG_LIBC_EXECFUNCS=y
CONFIG_POSIX_SPAWN_DEFAULT_STACKSIZE=2048
CONFIG_LIBC_HOSTNAME=\
CONFIG_LIBC_OPEN_MAX=256
CONFIG_NAME_MAX=32
CONFIG_PATH_MAX=256
CONFIG_LINE_MAX=80
CONFIG_LIBC_STRERROR_ERRNUM=y
CONFIG_LIBC_STRSIGNAL=y
CONFIG_TLS_NELEM=0
CONFIG_TLS_TASK_NELEM=0
CONFIG_TLS_NCLEANUP=0
CONFIG_LIBC_GAISTRERROR_ERRNUM=y
CONFIG_LIBC_ENVPATH=y
CONFIG_LIBC_FTOK_VFS_PATH=/var/ftok
CONFIG_LIBC_MEMFD_ERROR=y
CONFIG_LIBC_TEMPBUFFER=y
CONFIG_LIBC_MAX_TEMPBUFFER=2
CONFIG_LIBC_TEMPBUFFER_MALLOC=y
CONFIG_LIBC_MUTEX_BACKTRACE=0
CONFIG_BUILTIN=y
CONFIG_STREAM_OUT_BUFFER_SIZE=64
CONFIG_STREAM_HEXDUMP_BUFFER_SIZE=128
CONFIG_STREAM_BASE64_BUFFER_SIZE=128
CONFIG_LIBC_INLINE_QUEUE=y
CONFIG_LIBM_TOOLCHAIN=y
CONFIG_BUILTIN_TOOLCHAIN=y
CONFIG_COVERAGE_NONE=y
CONFIG_COVERAGE_DEFAULT_PREFIX_STRIP=\0
CONFIG_COVERAGE_DEFAULT_PREFIX=/data
CONFIG_PROFILE_NONE=y
CONFIG_EXAMPLES_USERFS=y
CONFIG_EXAMPLES_USERFS_PROGNAME=\userfs
CONFIG_EXAMPLES_USERFS_PRIORITY=100
CONFIG_EXAMPLES_USERFS_STACKSIZE=2048
CONFIG_FSUTILS_MKFATFS=y
CONFIG_MKFATFS_BUFFER_ALIGNMENT=0
CONFIG_FSUTILS_PASSWD=y
CONFIG_FSUTILS_PASSWD_PATH=/etc/passwd
CONFIG_FSUTILS_PASSWD_READONLY=y
CONFIG_FSUTILS_PASSWD_IOBUFFER_SIZE=512
CONFIG_FSUTILS_PASSWD_KEY1=0x12345678
CONFIG_FSUTILS_PASSWD_KEY2=0x9abcdef0
CONFIG_FSUTILS_PASSWD_KEY3=0x12345678
CONFIG_FSUTILS_PASSWD_KEY4=0x9abcdef0
CONFIG_NETUTILS_NETLIB=y
CONFIG_NSH_LIBRARY=y
CONFIG_NSH_PROMPT_STRING=\nsh>
CONFIG_NSH_PROMPT_MAX=32
CONFIG_NSH_PROMPT_ENV=\PS1
CONFIG_NSH_PROMPT_SUFFIX=>
CONFIG_NSH_READLINE=y
CONFIG_NSH_QUOTE=y
CONFIG_NSH_MAXARGUMENTS=7
CONFIG_NSH_ARGCAT=y
CONFIG_NSH_NESTDEPTH=3
CONFIG_NSH_ALIAS=y
CONFIG_NSH_ALIAS_MAX_AMOUNT=1
CONFIG_NSH_PIPELINE=y
CONFIG_NSH_BUILTIN_APPS=y
CONFIG_NSH_FILE_APPS=y
CONFIG_NSH_DISABLE_DATE=y
CONFIG_NSH_DISABLE_LOSMART=y
CONFIG_NSH_DISABLE_LOMTD=y
CONFIG_NSH_DISABLE_MB=y
CONFIG_NSH_DISABLE_MH=y
CONFIG_NSH_DISABLE_MW=y
CONFIG_NSH_DISABLE_SHUTDOWN=y
CONFIG_NSH_DISABLE_TIMEDATECTL=y
CONFIG_NSH_CODECS_BUFSIZE=128
CONFIG_NSH_PROC_MOUNTPOINT=/proc
CONFIG_NSH_FILEIOSIZE=1024
CONFIG_NSH_SYSINITSCRIPT=\init.d/rc.sysinit
CONFIG_NSH_INITSCRIPT=\init.d/rcS
CONFIG_NSH_SCRIPT_REDIRECT_PATH=\
CONFIG_NSH_CONSOLE=y
CONFIG_NSH_ARCHINIT=y
CONFIG_NSH_WGET_BUFF_SIZE=512
CONFIG_SYSTEM_DD=y
CONFIG_SYSTEM_DD_PROGNAME=\dd
CONFIG_SYSTEM_DD_PRIORITY=100
CONFIG_SYSTEM_DD_STACKSIZE=2048
CONFIG_SYSTEM_DD_STATS=y
CONFIG_SYSTEM_LSAN=y
CONFIG_SYSTEM_LSAN_PROGNAME=\lsan
CONFIG_SYSTEM_LSAN_PRIORITY=100
CONFIG_SYSTEM_LSAN_STACKSIZE=2048
CONFIG_SYSTEM_NSH=y
CONFIG_SYSTEM_NSH_PRIORITY=100
CONFIG_SYSTEM_NSH_STACKSIZE=2048
CONFIG_SYSTEM_NSH_PROGNAME=\nsh
CONFIG_SYSTEM_READLINE=y
CONFIG_READLINE_HAVE_EXTMATCH=y
CONFIG_READLINE_ECHO=y
CONFIG_READLINE_TABCOMPLETION=y
CONFIG_READLINE_MAX_BUILTINS=64
CONFIG_READLINE_MAX_EXTCMDS=64

Host system OS:
Linux 96fc4e41a7a3 5.15.0-139-generic #149~20.04.1-Ubuntu SMP Wed Apr 16 08:29:56 UTC 2025 x86_64 x86_64

Host system PATH:
/root/.vscode-server/bin/994fd12f8d3a5aa16f17d42c041e5809167e845a/bin/remote-cli
/usr/local/sbin
/usr/local/bin
/usr/sbin
/usr/bin
/sbin
/bin

Verification

• I have verified before submitting the report.

[xiaoxiang781216]

@HedongGao please look at this problem.

[HedongGao]

@HedongGao please look at this problem.

OK，I have fixed this problem and submitted pr.

[HedongGao]

Hi @liamHowatt I have fix this issue， and submited a pr 17785
Thank you very much again!