[BUG] Several file utilities only occasually work

### Description / Steps to reproduce the issue

On Pi Pico W board with Pi Pico SDK 2.0, setup a system with working flash SmartFS file system and USB console, e.g.,
./tools/configure.sh -l raspberrypi-pico-w:nsh-flash
reference raspberrypi-pico-w:usbnsh base configuration to add USB console
or execute the following script:

```
#!/bin/bash

#kconfig-tweak --set-val CONFIG_BASE_DEFCONFIG "raspberrypi-pico-w:telnet-dirty"
kconfig-tweak --disable CONFIG_DEBUG_USB
kconfig-tweak --enable CONFIG_BOARDCTL_USBDEVCTRL
kconfig-tweak --disable CONFIG_DEV_CONSOLE
kconfig-tweak --enable CONFIG_SERIAL_REMOVABLE
kconfig-tweak --enable CONFIG_SERIAL_TXDMA
kconfig-tweak --enable CONFIG_SERIAL_RXDMA
kconfig-tweak --disable CONFIG_UART0_SERIAL_CONSOLE
kconfig-tweak --enable CONFIG_NO_SERIAL_CONSOLE
kconfig-tweak --enable CONFIG_USBDEV

# USB Device Controller Driver Options
kconfig-tweak --set-val CONFIG_USBDEV_EPBUFFER_ALIGNMENT 0
kconfig-tweak --enable CONFIG_USBDEV_SELFPOWERED
kconfig-tweak --set-val CONFIG_USBDEV_MAXPOWER 100
kconfig-tweak --set-val CONFIG_USBDEV_TRACE_INITIALIDSET 0

# USB Device Class Driver Options
kconfig-tweak --enable CONFIG_CDCACM
kconfig-tweak --enable CONFIG_CDCACM_CONSOLE
kconfig-tweak --enable CONFIG_CDCACM_HAVE_EPINTIN
kconfig-tweak --set-val CONFIG_CDCACM_EP0MAXPACKET 64
kconfig-tweak --set-val CONFIG_CDCACM_EPINTIN 1
kconfig-tweak --set-val CONFIG_CDCACM_EPINTIN_FSSIZE 64
kconfig-tweak --set-val CONFIG_CDCACM_EPBULKOUT 3
kconfig-tweak --set-val CONFIG_CDCACM_EPBULKOUT_FSSIZE 64
kconfig-tweak --set-val CONFIG_CDCACM_EPBULKIN 2
kconfig-tweak --set-val CONFIG_CDCACM_EPBULKIN_FSSIZE 64
kconfig-tweak --set-val CONFIG_CDCACM_NRDREQS 4
kconfig-tweak --set-val CONFIG_CDCACM_NWRREQS 4
kconfig-tweak --set-val CONFIG_CDCACM_BULKOUT_REQLEN 256
kconfig-tweak --set-val CONFIG_CDCACM_BULKIN_REQLEN 96
kconfig-tweak --set-val CONFIG_CDCACM_RXBUFSIZE 257
kconfig-tweak --set-val CONFIG_CDCACM_TXBUFSIZE 193
kconfig-tweak --set-val CONFIG_CDCACM_VENDORID 0x0525
kconfig-tweak --set-val CONFIG_CDCACM_PRODUCTID 0xa4a7
kconfig-tweak --set-val CONFIG_CDCACM_VENDORSTR "NuttX"
kconfig-tweak --set-val CONFIG_CDCACM_PRODUCTSTR "CDC/ACM Serial"

kconfig-tweak --enable CONFIG_NSH_USBCONSOLE
kconfig-tweak --set-val CONFIG_NSH_USBCONDEV "/dev/ttyACM0"
kconfig-tweak --set-val CONFIG_USBDEV_MINOR 0
kconfig-tweak --disable CONFIG_NSH_USBDEV_TRACE
kconfig-tweak --disable CONFIG_SYSTEM_CDCACM

```

The problem happens with df, free and also with ifconfig. The following is an example for df.

```
nsh> cd /flash
nsh> ls -l
/flash:
-rwsrwsrwx 14 test
nsh> df .
Block Number
Size Blocks Used Available Moun 0 0 0 /proc

nsh> df .
Block Number
Size Blocks Used Available Moun 0 0 0 /proc

nsh> df .
Block Number
Size Blocks Used Available Mounnsh>
nsh> df .
Block Number
Size Blocks Used Available Mounnsh>
nsh> df .
Block Number
Size Blocks Used Available Mounted on
1024 1468 12 1456 /flash
0 nsh>
nsh> df .
Block Number
Size Blocks Used Available Mounnsh>
nsh> df .
Block Number
Size Blocks Used Available Mounnsh>
nsh> df .
Block Number
Size Blocks Used Available Moun 0 0 0 /proc

nsh> df .
Block Number
Size Blocks Used Available Mounnsh>
nsh> df .
Block Number
Size Blocks Used Available Mounnsh>
nsh> df .
Block Number
Size Blocks Used Available Mounted on
1024 1468 12 1456 /flash
0 nsh>
nsh> df .
Block Number
Size Blocks Used Available Mounted on
1024 1468 12 1456 /flash
0 0 0 0 /proc

nsh> df .
Block Number
Size Blocks Used Available Moun 0 0 0 /proc

nsh> df .
Block Number
Size Blocks Used Available Mounted on
1024 1468 12 1456 /flash
0 nsh>
nsh> df .
Block Number
Size Blocks Used Available Mounted on
1024 1468 12 1456 /flash
0 nsh>
nsh> df .
Block Number
Size Blocks Used Available Mounnsh>
nsh> df .
Block Number
Size Blocks Used Available Mounnsh>
```

### On which OS does this issue occur?

[OS: Linux]

### What is the version of your OS?

Windows 11 WSL2 Ubuntu 22.04.2

### NuttX Version

NuttX 12.7.0-RC0 0976258-dirty Oct 4 2024 22:58:36 arm rasp

### Issue Architecture

[Arch: arm]

### Issue Area

[Area: File System]

### Verification

- [X] I have verified before submitting the report.