posix_fallocate throws `RangeError`

[hly2019]

Version of emscripten/emsdk:

5.0.6

Calling posix_fallocate(fd, offset, len) with offset + len past Number.MAX_SAFE_INTEGER (2^53 − 1) throws a RangeError and kills the whole wasm instance.

Failing command line in full:

$ emcc -O0 -Wall fallocate.c -o a.out.js
$ node a.out.js
a.out.js:1518
        node.contents = new Uint8Array(newSize); // Allocate new storage.
                        ^

RangeError: Invalid typed array length: 9007199254740996
    at new Uint8Array (<anonymous>)
    at Object.resizeFileStorage (a.out.js:1518:25)
    at setattr (a.out.js:1558:19)
    at Object.doSetAttr (a.out.js:2341:9)
    at Object.doTruncate (a.out.js:2829:12)
    at Object.ftruncate (a.out.js:2852:12)
    at ___syscall_fallocate (a.out.js:944:12)
    at wasm://wasm/00010f56:wasm-function[38]:0xd46
    at wasm://wasm/00010f56:wasm-function[11]:0x41c
    at wasm://wasm/00010f56:wasm-function[12]:0x529

The same program on native Linux prints ret=27 errno=0 and exits cleanly.

Example code snippet:

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

int main(void) {
    int fd = open("/tmp/x", O_RDWR | O_CREAT | O_TRUNC, 0644);
    off_t off = (off_t)1 << 53;                  
    int ret = posix_fallocate(fd, off, 3);   
    printf("ret=%d errno=%d (%s)\n", ret, errno, strerror(errno));
    close(fd);
    return 0;
}