Bug 41958

Ничего не понятно, но спасибо на багрепорт.

$ rustc -vV
rustc 1.58.1
binary: rustc
commit-hash: unknown
commit-date: unknown
host: i686-unknown-linux-gnu
release: 1.58.1
LLVM version: 12.0.1

$ cat >main.rs
use std::fs;

fn main() -> std::io::Result<()> {
    let metadata = match fs::metadata("foo.txt") {
        Err(why) => panic!("couldn't open: {}", why),
        Ok(file) => file,
    };
    print!("len: {}\n",  metadata.len());
    Ok(())
}

$ rustc main.rs

$ truncate -s 6E foo.txt

$ ./main 
len: 6917529027641081856

$ nm main |grep -o 'U open.*'
U open64@GLIBC_2.1
U open@GLIBC_2.0

$ nm main |grep -o 'U .*stat.*'
U fstat64@GLIBC_2.33
U stat64@GLIBC_2.33

$ strace -f -e trace=file ./main 
execve("./main", ["./main"], 0xffa21b1c /* 17 vars */) = 0
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
statx(3, "", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT|AT_EMPTY_PATH, STATX_BASIC_STATS, {stx_mask=STATX_BASIC_STATS|STATX_MNT_ID, stx_attributes=0, stx_mode=S_IFREG|0644, stx_size=5695, ...}) = 0
openat(AT_FDCWD, "/lib/libgcc_s.so.1", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
statx(3, "", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT|AT_EMPTY_PATH, STATX_BASIC_STATS, {stx_mask=STATX_BASIC_STATS|STATX_MNT_ID, stx_attributes=0, stx_mode=S_IFREG|0644, stx_size=127880, ...}) = 0
openat(AT_FDCWD, "/lib/libc.so.6", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
statx(3, "", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT|AT_EMPTY_PATH, STATX_BASIC_STATS, {stx_mask=STATX_BASIC_STATS|STATX_MNT_ID, stx_attributes=0, stx_mode=S_IFREG|0755, stx_size=2002476, ...}) = 0
openat(AT_FDCWD, "/proc/self/maps", O_RDONLY|O_CLOEXEC) = 3
statx(3, "", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT|AT_EMPTY_PATH, STATX_BASIC_STATS, {stx_mask=STATX_BASIC_STATS|STATX_MNT_ID, stx_attributes=0, stx_mode=S_IFREG|0444, stx_size=0, ...}) = 0
statx(0, NULL, AT_STATX_SYNC_AS_STAT, STATX_ALL, NULL) = -1 EFAULT (Bad address)
statx(AT_FDCWD, "foo.txt", AT_STATX_SYNC_AS_STAT, STATX_ALL, {stx_mask=STATX_BASIC_STATS|STATX_MNT_ID, stx_attributes=0, stx_mode=S_IFREG|0644, stx_size=6917529027641081856, ...}) = 0
len: 6917529027641081856
+++ exited with 0 +++

$ grep -c statx /usr/lib/rpm/verify-elf-non-lfs-funcs.list
0

Ещё для наглядности:

$ cat main.rs 
use std::fs::File;

fn main() {
    let file = match File::open("foo.txt") {
        Err(why) => panic!("couldn't open: {}", why),
        Ok(file) => file,
    };
    let metadata = match file.metadata() {
        Err(why) => panic!("couldn't get metadata: {}", why),
        Ok(file) => file,
    };
    print!("len: {}\n",  metadata.len());
}

$ strace -f ./main 2>&1 |grep foo.txt 
openat(AT_FDCWD, "foo.txt", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3

$ for f in /usr/lib/rustlib/i686-unknown-linux-gnu/lib/lib*.rlib; do nm "$f" 2>/dev/null |grep -E "U ($(tr '\n' '|' < /usr/lib/rpm/verify-elf-non-lfs-funcs.list))$" && echo "$f"; done
         U fcntl
         U mmap
         U sendfile
         U fcntl
         U mmap
         U open
         U openat
/usr/lib/rustlib/i686-unknown-linux-gnu/lib/libstd-689d71722d0c29bf.rlib

$ rpmquery -f /usr/lib/rustlib/i686-unknown-linux-gnu/lib/libstd-689d71722d0c29bf.rlib
rust-1.58.1-alt1.i586