sumpfralle opened a new issue, #3063: URL: https://github.com/apache/nuttx-apps/issues/3063
### Description / Steps to reproduce the issue I am using the `CONFIG_RAMLOG_SYSLOG` feature (log messages being sent to `/dev/kmsg` and retrieved via `dmesg`). This works in general. But sadly the output of `dmesg` is usually heavily garbled: lots of characters (single or in big chunks) are missing. Repeated calls of `dmesg` emit different output (i.e. the missing characters are randomly spread). # Potential cause The output of `dmesg` is created by [`nsh_catfile`](https://github.com/apache/nuttx-apps/blob/5585c9d347ccc0d14b909eb8a8e0e74ad81bb04e/nshlib/nsh_fsutils.c#L143). `nsh_catfile` uses the [`nsh_write`](https://github.com/apache/nuttx-apps/blob/5585c9d347ccc0d14b909eb8a8e0e74ad81bb04e/nshlib/nsh_console.h#L48) macro: ```c #define nsh_write(v,b,n) (v)->write(v,b,n) ``` I tried to slow down the read operation in `nsh_catfile`: ```patch diff --git a/nshlib/nsh_fsutils.c b/nshlib/nsh_fsutils.c index 878c1d18e..f3d91d2bc 100644 --- a/nshlib/nsh_fsutils.c +++ b/nshlib/nsh_fsutils.c @@ -178,7 +178,7 @@ int nsh_catfile(FAR struct nsh_vtbl_s *vtbl, FAR const char *cmd, for (; ; ) { - int nbytesread = read(fd, buffer, IOBUFFERSIZE); + int nbytesread = read(fd, buffer, 8); /* Check for read errors */ ``` The above change fixes the issue for me. No more characters get lost in the void. The above change is obviously not acceptable. Instead, the output should probably block in some way in order to prevent itself from being overwhelmed? # Setup I am using an `w5500-evb-pico` board (rp2040). The nsh console is writing to the serial USB device. My configuration: ```kconfig # CONFIG_ARCH_LEDS is not set # CONFIG_DEV_CONSOLE is not set # CONFIG_DISABLE_OS_API is not set # CONFIG_EXAMPLES_UDPBLASTER_INIT is not set # CONFIG_LIBC_LONG_LONG is not set # CONFIG_NET_RECV_PACK is not set # CONFIG_NSH_ARGCAT is not set # CONFIG_NSH_CMDOPT_HEXDUMP is not set # CONFIG_NSH_DISABLE_DATE is not set # CONFIG_NSH_DISABLE_LOSMART is not set # CONFIG_NSH_NETINIT is not set # CONFIG_RP2040_UART0 is not set CONFIG_ARCH="arm" CONFIG_ARCH_BOARD="w5500-evb-pico" CONFIG_ARCH_BOARD_W5500_EVB_PICO=y CONFIG_ARCH_CHIP="rp2040" CONFIG_ARCH_CHIP_RP2040=y CONFIG_ARCH_INTERRUPTSTACK=2048 CONFIG_ARCH_RAMVECTORS=y CONFIG_ARCH_STACKDUMP=y CONFIG_AT24XX_MULTI=y CONFIG_AT24XX_SIZE=256 CONFIG_BOARDCTL_RESET=y CONFIG_BOARD_LOOPSPERMSEC=10450 CONFIG_BUILTIN=y CONFIG_CDCACM=y CONFIG_CDCACM_CONSOLE=y CONFIG_DEBUG_FEATURES=y CONFIG_DEBUG_FULLOPT=y CONFIG_DEBUG_HARDFAULT_ALERT=y CONFIG_DEBUG_HARDFAULT_INFO=y CONFIG_DEBUG_SYMBOLS=y CONFIG_DEV_GPIO=y CONFIG_DEV_GPIO_NPOLLWAITERS=4 CONFIG_DEV_GPIO_NSIGNALS=4 CONFIG_EEPROM=y CONFIG_EXAMPLES_UDPBLASTER=y CONFIG_EXAMPLES_UDPBLASTER_HOSTIP=0xac108c99 CONFIG_EXAMPLES_UDPBLASTER_HOSTRATE=8000000 CONFIG_EXAMPLES_UDPBLASTER_TARGETIP=0xac108c15 CONFIG_FS_LITTLEFS=y CONFIG_FS_PROCFS=y CONFIG_FS_PROCFS_REGISTER=y CONFIG_I2C_EE_24XX=y CONFIG_INIT_ENTRYPOINT="thunderhawk_main" CONFIG_IOB_NBUFFERS=24 CONFIG_IOB_THROTTLE=0 CONFIG_MTD=y CONFIG_MTD_AT24XX=y CONFIG_MTD_PARTITION=y CONFIG_MTD_PARTITION_NAMES=y CONFIG_NET=y CONFIG_NETDB_DNSCLIENT=y CONFIG_NETDEV_HPWORK_THREAD=y CONFIG_NETDEV_MAX_IPv6_ADDR=4 CONFIG_NETDEV_MULTIPLE_IPv6=y CONFIG_NETINIT_DHCPC=y CONFIG_NETINIT_NOMAC=y CONFIG_NETUTILS_CJSON=y CONFIG_NETUTILS_CJSON_VERSION="1.7.18" CONFIG_NETUTILS_IPERF=y CONFIG_NETUTILS_NETCAT=y CONFIG_NETUTILS_NETINIT=y CONFIG_NET_ETH_PKTSIZE=1516 CONFIG_NET_ICMPv6=y CONFIG_NET_ICMPv6_AUTOCONF=y CONFIG_NET_ICMPv6_NEIGHBOR=y CONFIG_NET_ICMPv6_SOCKET=y CONFIG_NET_IPv6=y CONFIG_NET_IPv6_NCONF_ENTRIES=256 CONFIG_NET_MLD=y CONFIG_NET_TCP=y CONFIG_NET_TCP_PREALLOC_CONNS=16 CONFIG_NET_TCP_WRITE_BUFFERS=y CONFIG_NET_UDP=y CONFIG_NET_UDP_WRITE_BUFFERS=y CONFIG_NET_W5500=y CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=6 CONFIG_NSH_BUILTIN_APPS=y CONFIG_NSH_READLINE=y CONFIG_RAMLOG=y CONFIG_RAMLOG_BUFSIZE=131072 CONFIG_RAMLOG_SYSLOG=y CONFIG_RAM_SIZE=270336 CONFIG_RAM_START=0x20000000 CONFIG_READLINE_CMD_HISTORY=y CONFIG_RP2040_I2C1=y CONFIG_RP2040_I2C1_SCL_GPIO=27 CONFIG_RP2040_I2C1_SDA_GPIO=26 CONFIG_RP2040_I2C=y CONFIG_RP2040_I2C_DRIVER=y CONFIG_RP2040_SPI0=y CONFIG_RP2040_SPI=y CONFIG_RR_INTERVAL=200 CONFIG_SCHED_BACKTRACE=y CONFIG_SCHED_CPULOAD_SYSCLK=y CONFIG_SCHED_CPULOAD_TIMECONSTANT=60 CONFIG_SCHED_HPWORK=y CONFIG_SCHED_LPWORK=y CONFIG_SCHED_STACK_RECORD=10 CONFIG_SCHED_WAITPID=y CONFIG_SCPI_PARSER=y CONFIG_SMP=y CONFIG_SMP_NCPUS=2 CONFIG_SPECIFIC_DRIVERS=y CONFIG_START_YEAR=2025 CONFIG_SYSLOG_CHAR=y CONFIG_SYSLOG_PRIORITY=y CONFIG_SYSLOG_TIMESTAMP=y CONFIG_SYSTEM_DHCPC_RENEW6=y CONFIG_SYSTEM_DHCPC_RENEW=y CONFIG_SYSTEM_I2CTOOL=y CONFIG_SYSTEM_NSH=y CONFIG_SYSTEM_PING6=y CONFIG_SYSTEM_PING=y CONFIG_SYSTEM_SETLOGMASK=y CONFIG_SYSTEM_TIME64=y CONFIG_USBDEV=y CONFIG_USBDEV_BUSPOWERED=y ``` ### On which OS does this issue occur? [OS: Linux] ### What is the version of your OS? Debian Trixie ### NuttX Version master ### Issue Architecture [Arch: arm] ### Issue Area [Area: NSH] ### Verification - [x] I have verified before submitting the report. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@nuttx.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
