board qemu_riscv64.debug.swi panicked with attempt to subtract with overflow when running test_procfs_posix

[han-jiang277]

[ RUN      ] test_procfs_posix
[VFS Test] read /proc/meminfo content:
MemTotal:         8192 kB
MemAvailable:     8119 kB
MemUsed:            72 kB
MemMaxUsed:        109 kB

panicked at ../../kernel/kernel/src/vfs/procfs/stat.rs:115:17:
attempt to subtract with overflow
attempt to subtract with overflow
---- Begin stack unwinding ----
   0:         0x800137da - <unknown>
---- Ended stack unwinding ----
Check Timeout
[200/206] ACTION //kernel/kernel:kernel_unittest_clippy(//build/toolchain:blueos_riscv64)
ninja: build stopped: subcommand failed.
❌ qemu_riscv64.debug.swi build failed: Command failed: ninja -C out/qemu_riscv64.debug.swi check_all

https://github.com/vivoblueos/kernel/actions/runs/23521179168/job/68464780657