Reading uninitialized memory from FUSE

[mkroening]

#1248 has mare it mode likely that we end up reading uninitialized memory for FUSE. I suspect this is coming from subtle codegen changes (aka we are doing something wrong with uninit memory or references).

$ cargo xtask ci qemu --arch x86_64 --profile release --package rftrace-example --virtiofsd
...
Saving traces to disk...!
0xc1b000, Events { ptr: 0xc1b000, len: 2000, cap: 2000 }
  Parsing TID 1...!
  Writing to disk: 8 events, 128 bytes (/root/tracedir/1.dat)
  Parsed all events!
Creating fake uftrace data dir at /root/tracedir..
  Creating ./info
    feats = TASK_SESSION | SYM_REL_ADDR
    info = CMDLINE | TASKINFO
    cmdline = 'fakeuftrace'
    tid = [1]
  Creating ./task.txt
[0][PANIC] panicked at src/fs/fuse.rs:479:47:
called `Result::unwrap()` on an `Err` value: TryFromIntError(())

This happens while converting a u64 into an i64, so this is most definitely not a real value.

kernel/src/fs/fuse.rs

Line 479 in a723af0

st_blocks: attr.blocks.try_into().unwrap(),

I'll disable the test in CI for now.