[BUG] Divided by zero in Littlefs and MTD NAND with `int16_t` of blksize in stat.

[wangtao13]

Description / Steps to reproduce the issue

I am working a running littlefs (2.11.1) in my MIPS32 system.
I have setup one MTD partition in NAND with 8MB as partition size, the NAND FLASH has eraseblock of 128KB and page of 2048.
Firstly, I erase the MTD partition entirelly, and littlefs can be mounted well, the following codes does the FS mount.

static int setup_littlefs(const char *path, struct mtd_dev_s *mtd,
                          const char *mnt_pt, int priv)
{
  int ret = OK;

  if (mnt_pt != NULL)
    {
      ret = nx_mount(path, mnt_pt, "littlefs", 0, "autoformat");
      if (ret < 0)
        {
          ret = nx_mount(path, mnt_pt, "littlefs", 0, "forceformat");
          if (ret < 0)
            {
              ferr("ERROR: Failed to mount the FS volume: %d\n", ret);
              return ret;
            }
        }
    }

  return OK;
}

...
       ret = setup_littlefs(table->name, mtd, "/mnt/data", 0755);
       if (ret < 0)
         {
           syslog(LOG_ERR, "ERROR: Failed to setup littlefs\n");
           return ret;
         }
...

After fs is mounted at /mnt/data, ls /mnt/data will trigger an exception as follows,

EXCEPTION: Trap exception CAUSE: 08000034 EPC: 8013fb8c

I disassbled the instructions at EPC, and found it is a divided by zero error.

With lots of debugging, finally I found it was from following codes in fs/littlefs/littlefs/lfs_vfs.c

  buf->st_blksize      = fs->cfg.block_size;
  buf->st_blocks       = (buf->st_size + buf->st_blksize - 1) /
                         buf->st_blksize;

buf->st_blksize is 0, which triggered an divided by zero error.

fs->cfg.block_size is 0x20000, not 0!
The root cause of the failure is from the type of st_blksize which is defined as follows,

include/sys/stat.h
struct stat
{
  /* Required, standard fields */

  dev_t            st_dev;     /* Device ID of device containing file */
  ino_t            st_ino;     /* File serial number */
  mode_t           st_mode;    /* File type, attributes, and access mode bits */
  nlink_t          st_nlink;   /* Number of hard links to the file */
  uid_t            st_uid;     /* User ID of file */
  gid_t            st_gid;     /* Group ID of file */
  dev_t            st_rdev;    /* Device ID (if file is character or block special) */
  off_t            st_size;    /* Size of file/directory, in bytes */
  struct timespec  st_atim;    /* Time of last access */
  struct timespec  st_mtim;    /* Time of last modification */
  struct timespec  st_ctim;    /* Time of last status change */
  blksize_t        st_blksize; /* Block size used for filesystem I/O */
  blkcnt_t         st_blocks;  /* Number of blocks allocated */
};


include/sys/types.h
typedef int16_t      blksize_t;

st_blksize is type of int16_t, which much smaller than 128KB, and it is truncated to zero when the blocksize is more than 64KB.

I checked the blksize_t defined in newlib-4, it is defined as long.

I don't know why it is type of int16_t in nuttx, but it did trigger an error in my littlefs depolyment.

On which OS does this issue occur?

[OS: Other]

What is the version of your OS?

WSL2

NuttX Version

12.13.0

Issue Architecture

[Arch: mips]

Issue Area

[Area: File System]

Host information

NuttX configuration options:
CONFIG_ALLOW_GPL_COMPONENTS=y
CONFIG_HOST_LINUX=y
CONFIG_APPS_DIR="../apps"
CONFIG_BASE_DEFCONFIG="../testmips/configs/nsh-dirty"
CONFIG_BUILD_FLAT=y
CONFIG_RAW_BINARY=y
CONFIG_OUTPUT_STRIP_PATHS=y
CONFIG_ARCH_NONE_DEBUG_H=y
CONFIG_FORTIFY_SOURCE=0
CONFIG_NDEBUG=y
CONFIG_DEBUG_ALERT=y
CONFIG_DEBUG_FEATURES=y
CONFIG_DEBUG_ERROR=y
CONFIG_DEBUG_WARN=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_FS=y
CONFIG_DEBUG_FS_ERROR=y
CONFIG_DEBUG_FS_WARN=y
CONFIG_DEBUG_FS_INFO=y
CONFIG_DEBUG_SCHED=y
CONFIG_DEBUG_SCHED_ERROR=y
CONFIG_DEBUG_SCHED_WARN=y
CONFIG_DEBUG_SCHED_INFO=y
CONFIG_STACK_USAGE=y
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_CUSTOMOPT=y
CONFIG_DEBUG_OPTLEVEL="-O2"
CONFIG_LTO_NONE=y
CONFIG_DEBUG_LINK_MAP=y
CONFIG_ARCH_MIPS=y
CONFIG_ARCH="xburst"
CONFIG_ARCH_FAMILY="mips32"
CONFIG_ARCH_CHIP="mips32r2"
CONFIG_MIPS32_HAVE_ICACHE=y
CONFIG_MIPS32_HAVE_DCACHE=y
CONFIG_MIPS32_ICACHE=y
CONFIG_MIPS32_ICACHE_SIZE=16384
CONFIG_MIPS32_ILINE_SIZE=16
CONFIG_MIPS32_KSEG0_IBASE=0x9d000000
CONFIG_MIPS32_DCACHE=y
CONFIG_MIPS32_DCACHE_SIZE=16384
CONFIG_MIPS32_DLINE_SIZE=16
CONFIG_MIPS32_KSEG0_DBASE=0x80000000
CONFIG_ARCH_CHIP_X1600=y
CONFIG_MIPS32_TOOLCHAIN_MIPS=y
CONFIG_ARCH_CHIP_X1600HN=y
CONFIG_MIPS_WDT=y
CONFIG_MIPS_SFC=y
CONFIG_MIPS_UART2=y
CONFIG_MIPS_OSCIOFNC=1
CONFIG_MIPS_FUSBIDIO=0
CONFIG_MIPS_SFC_CLKFREQ=50000000
CONFIG_MIPS_FLASH_NAND=y
CONFIG_MIPS_NAND_GD=y
CONFIG_ARCH_TOOLCHAIN_GNU=y
CONFIG_ARCH_HAVE_IRQPRIO=y
CONFIG_ARCH_ICACHE=y
CONFIG_ARCH_DCACHE=y
CONFIG_ARCH_HAVE_FPU=y
CONFIG_ARCH_HAVE_LAZYFPU=y
CONFIG_ARCH_HAVE_RESET=y
CONFIG_ARCH_FPU=y
CONFIG_NCPUS=1
CONFIG_ARCH_STACKDUMP=y
CONFIG_ARCH_STACKDUMP_MAX_LENGTH=10
CONFIG_ARCH_HAVE_RAMFUNCS=y
CONFIG_BOARD_LOOPSPERMSEC=7245
CONFIG_ARCH_HAVE_INTERRUPTSTACK=y
CONFIG_ARCH_INTERRUPTSTACK=0
CONFIG_BOOT_RUNFROMFLASH=y
CONFIG_RAM_START=0x80000000
CONFIG_RAM_SIZE=33554432
CONFIG_FLASH_START=0x0
CONFIG_FLASH_SIZE=0
CONFIG_ARCH_BOARD_CUSTOM=y
CONFIG_ARCH_BOARD_CUSTOM_NAME="testmips"
CONFIG_ARCH_BOARD_CUSTOM_DIR="../testmips/"
CONFIG_ARCH_BOARD_CUSTOM_DIR_RELPATH=y
CONFIG_MMCSD_HAVE_CARDDETECT=y
CONFIG_BOARD_CRASHDUMP_NONE=y
CONFIG_BOARDCTL=y
CONFIG_BOARDCTL_RESET=y
CONFIG_BOARD_RESET_ON_ASSERT=0
CONFIG_BOARD_ASSERT_RESET_VALUE=1
CONFIG_BOARDCTL_RESET_CAUSE=y
CONFIG_BOARDCTL_MKRD=y
CONFIG_BOARD_MEMORY_RANGE=""
CONFIG_DISABLE_OS_API=y
CONFIG_USEC_PER_TICK=1000
CONFIG_TIMER_ADJUST_USEC=0
CONFIG_START_YEAR=2012
CONFIG_START_MONTH=3
CONFIG_START_DAY=7
CONFIG_PREALLOC_TIMERS=4
CONFIG_IRQ_NWORKS=8
CONFIG_IRQ_WORK_SECTION=""
CONFIG_IRQ_WORK_STACKSIZE=3072
CONFIG_INIT_ENTRY=y
CONFIG_INIT_ARGS=""
CONFIG_INIT_STACKSIZE=8196
CONFIG_INIT_PRIORITY=100
CONFIG_INIT_ENTRYPOINT="nsh_main"
CONFIG_INIT_ENTRYNAME="nsh_main"
CONFIG_RR_INTERVAL=100
CONFIG_TASK_NAME_SIZE=21
CONFIG_SCHED_WAITPID=y
CONFIG_SCHED_DUMP_LEAK=y
CONFIG_PTHREAD_MUTEX_BOTH=y
CONFIG_PTHREAD_MUTEX_DEFAULT_ROBUST=y
CONFIG_PTHREAD_MUTEX_DEFAULT_PRIO_NONE=y
CONFIG_SCHED_IRQMONITOR=y
CONFIG_SCHED_CPULOAD_NONE=y
CONFIG_SCHED_CPULOAD_TICKSPERSEC=100
CONFIG_SCHED_PROFILE_TICKSPERSEC=1000
CONFIG_SCHED_STACK_RECORD=4
CONFIG_DEV_CONSOLE=y
CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=8
CONFIG_FILE_STREAM=y
CONFIG_ENABLE_ALL_SIGNALS=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_DISABLE_MQUEUE_NOTIFICATION=y
CONFIG_SCHED_WORKQUEUE=y
CONFIG_SCHED_HPWORK=y
CONFIG_SCHED_HPNTHREADS=1
CONFIG_SCHED_HPWORKPRIORITY=224
CONFIG_SCHED_HPWORKSTACKSIZE=4096
CONFIG_SCHED_HPWORKSTACKSECTION=""
CONFIG_DEFAULT_TASK_STACKSIZE=4096
CONFIG_IDLETHREAD_STACKSIZE=4096
CONFIG_PTHREAD_STACK_MIN=3072
CONFIG_PTHREAD_STACK_DEFAULT=4096
CONFIG_PTHREAD_GUARDSIZE_DEFAULT=0
CONFIG_PID_INITIAL_COUNT=16
CONFIG_WATCHDOG=y
CONFIG_WATCHDOG_DEVPATH="/dev/watchdog0"
CONFIG_WATCHDOG_MAGIC_V=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_MMCSD=y
CONFIG_MMCSD_IOCSUPPORT=y
CONFIG_MMCSD_NSLOTS=1
CONFIG_MMCSD_MULTIBLOCK_LIMIT=0
CONFIG_MMCSD_MMCSUPPORT=y
CONFIG_MMCSD_HAVE_WRITEPROTECT=y
CONFIG_MTD=y
CONFIG_MTD_PARTITION=y
CONFIG_MTD_PARTITION_NAMES=y
CONFIG_MTD_BYTE_WRITE=y
CONFIG_MTD_CONFIG_NONE=y
CONFIG_MTD_SMART=y
CONFIG_MTD_SMART_SECTOR_SIZE=4096
CONFIG_MTD_SMART_WEAR_LEVEL=y
CONFIG_MTD_SMART_CONVERT_WEAR_FORMAT=y
CONFIG_MTD_SMART_FSCK=y
CONFIG_MTD_SMART_MINIMIZE_RAM=y
CONFIG_MTD_SMART_SECTOR_CACHE_SIZE=512
CONFIG_MTD_SMART_SECTOR_PACK_COUNTS=y
CONFIG_ARCH_HAVE_SERIAL_TERMIOS=y
CONFIG_SERIAL=y
CONFIG_SERIAL_CONSOLE=y
CONFIG_MCU_SERIAL=y
CONFIG_STANDARD_SERIAL=y
CONFIG_SERIAL_NPOLLWAITERS=4
CONFIG_UART2_SERIAL_CONSOLE=y
CONFIG_UART2_SERIALDRIVER=y
CONFIG_UART2_RXBUFSIZE=256
CONFIG_UART2_TXBUFSIZE=256
CONFIG_UART2_BAUD=115200
CONFIG_UART2_BITS=8
CONFIG_UART2_PARITY=0
CONFIG_UART2_2STOP=0
CONFIG_SYSLOG=y
CONFIG_SYSLOG_DEFAULT_MASK=0xff
CONFIG_SYSLOG_CRLF=y
CONFIG_SYSLOG_MAX_CHANNELS=1
CONFIG_SYSLOG_DEVPATH="/dev/ttyS2"
CONFIG_SYSLOG_REGISTER=y
CONFIG_FS_LARGEFILE=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_PROCFS=y
CONFIG_FS_PROCFS_REGISTER=y
CONFIG_FS_LITTLEFS=y
CONFIG_FS_LITTLEFS_PROGRAM_SIZE_FACTOR=16
CONFIG_FS_LITTLEFS_READ_SIZE_FACTOR=16
CONFIG_FS_LITTLEFS_BLOCK_SIZE_FACTOR=4
CONFIG_FS_LITTLEFS_CACHE_SIZE_FACTOR=16
CONFIG_FS_LITTLEFS_LOOKAHEAD_SIZE=64
CONFIG_FS_LITTLEFS_BLOCK_CYCLE=200
CONFIG_FS_LITTLEFS_NAME_MAX=32
CONFIG_FS_LITTLEFS_FILE_MAX=2147483647
CONFIG_FS_LITTLEFS_ATTR_MAX=1022
CONFIG_FS_LITTLEFS_HAS_LFS_DEFINES=y
CONFIG_FS_LITTLEFS_VERSION="v2.11.1"
CONFIG_NXFONTS_PACKEDMSFIRST=y
CONFIG_MM_DEFAULT_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_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_ARCH_ELF=y
CONFIG_LIBC_RAND_ORDER=1
CONFIG_LIBC_HOMEDIR="/"
CONFIG_LIBC_TMPDIR="/tmp"
CONFIG_LIBC_MAX_TMPFILE=32
CONFIG_LIBC_MAX_EXITFUNS=0
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=64
CONFIG_LIBC_STRERROR_ERRNUM=y
CONFIG_LIBC_STRSIGNAL=y
CONFIG_LIBC_ELF=y
CONFIG_LIBC_ELF_MAXDEPEND=2
CONFIG_LIBC_ELF_ALIGN_LOG2=2
CONFIG_LIBC_ELF_BUFFERSIZE=32
CONFIG_LIBC_ELF_BUFFERINCR=32
CONFIG_LIBC_ELF_RELOCATION_BUFFERCOUNT=256
CONFIG_LIBC_ELF_SYMBOL_CACHECOUNT=256
CONFIG_LIBC_LOCALTIME=y
CONFIG_LIBC_TZ_MAX_TIMES=370
CONFIG_LIBC_TZ_MAX_TYPES=20
CONFIG_LIBC_TZDIR="/etc/zoneinfo"
CONFIG_TLS_NELEM=0
CONFIG_TLS_TASK_NELEM=0
CONFIG_TLS_NCLEANUP=0
CONFIG_LIBC_GAISTRERROR_ERRNUM=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_HELLO=y
CONFIG_EXAMPLES_HELLO_PROGNAME="hello"
CONFIG_EXAMPLES_HELLO_PRIORITY=100
CONFIG_EXAMPLES_HELLO_STACKSIZE=8192
CONFIG_FSUTILS_MKFATFS=y
CONFIG_MKFATFS_BUFFER_ALIGNMENT=0
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_BUILTIN_APPS=y
CONFIG_NSH_DISABLE_VCONFIG=y
CONFIG_NSH_DISABLE_IFUPDOWN=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_MMCSDMINOR=0
CONFIG_NSH_MMCSDSLOTNO=0
CONFIG_NSH_CODECS_BUFSIZE=128
CONFIG_NSH_CMDOPT_HEXDUMP=y
CONFIG_NSH_PROC_MOUNTPOINT="/proc"
CONFIG_NSH_FILEIOSIZE=512
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_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_NSH=y
CONFIG_SYSTEM_NSH_PRIORITY=100
CONFIG_SYSTEM_NSH_STACKSIZE=8192
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
CONFIG_READLINE_CMD_HISTORY=y
CONFIG_READLINE_CMD_HISTORY_LINELEN=80
CONFIG_READLINE_CMD_HISTORY_LEN=16
CONFIG_TESTING_CACHETEST=y
CONFIG_TESTING_CACHETEST_PROGNAME="cachetest"
CONFIG_TESTING_CACHETEST_PRIORITY=100
CONFIG_TESTING_CACHETEST_STACKSIZE=4096
CONFIG_TESTING_HEAP=y
CONFIG_TESTING_HEAP_PROGNAME="heap"
CONFIG_TESTING_HEAP_PRIORITY=100
CONFIG_TESTING_HEAP_STACKSIZE=4096
CONFIG_TESTING_OSTEST=y
CONFIG_TESTING_OSTEST_LOOPS=1
CONFIG_TESTING_OSTEST_STACKSIZE=4096
CONFIG_TESTING_OSTEST_NBARRIER_THREADS=8
CONFIG_TESTING_OSTEST_RR_RANGE=30000
CONFIG_TESTING_OSTEST_RR_RUNS=10
CONFIG_TESTING_OSTEST_FPULOOPS=16
CONFIG_TESTING_OSTEST_FPUMSDELAY=750
CONFIG_TESTING_OSTEST_FPUPRIORITY=100
CONFIG_TESTING_OSTEST_FPUSTACKSIZE=4096
CONFIG_TESTING_OSTEST_WAITRESULT=y
CONFIG_TESTING_OSTEST_SPINLOCK_THREADS=2
CONFIG_TEST_LOOP_SCALE=100
CONFIG_TESTING_GETPRIME=y
CONFIG_TESTING_GETPRIME_PROGNAME="getprime"
CONFIG_TESTING_GETPRIME_PRIORITY=50
CONFIG_TESTING_GETPRIME_STACKSIZE=8192
CONFIG_TESTING_GETPRIME_THREAD_PRIORITY=10
CONFIG_TESTING_PTHREAD_MUTEX_PERF=y
CONFIG_TESTING_PTHREAD_MUTEX_PERF_PROGNAME="pmutexp"
CONFIG_TESTING_PTHREAD_MUTEX_PERF_PRIORITY=100
CONFIG_TESTING_PTHREAD_MUTEX_PERF_STACKSIZE=8192
CONFIG_TESTING_TIMERJITTER=y
CONFIG_TESTING_TIMERJITTER_PRIORITY=100
CONFIG_TESTING_TIMERJITTER_STACKSIZE=8192

Host system OS:
Linux t 6.6.114.1-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Mon Dec 1 20:46:23 UTC 2025 x86_64 x86_64

Host system PATH:
/home/t/.local/bin
/usr/local/sbin
/usr/local/bin
/usr/sbin
/usr/bin
/sbin
/bin
/usr/games
/usr/local/games
/snap/bin

Verification

• I have verified before submitting the report.

[hiSandog]

A 128 KiB erase block becoming zero when stored in a 16-bit st_blksize explains why this only appears with otherwise valid NAND geometry. The fix should account for the ABI/type of st_blksize, not merely clamp the LittleFS assignment, because other filesystems can report the same block size. A regression fixture with 64 KiB, 128 KiB, and 256 KiB erase blocks would expose both overflow-to-zero and signed wraparound cases.

[ML-dev-crypto]

Hi, I'd like to work on this issue. I've reproduced the divide-by-zero crash locally .I'll submit a PR once I've finished implementing the fix. Thanks!