[Bug 243155] Linuxulator: broken fadvise64 for 32-bit applications on amd64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243155

--- Comment #2 from Alex S <iwtcex at gmail.com> ---
(In reply to Mark Johnston from comment #1)

> Are you sure that this isn't just a truss bug?

Let's adjust the test a bit:

% cat fadvice_bug.c
#define _GNU_SOURCE

#include <assert.h>
#include <fcntl.h>

int main() {
  int fd = open("/etc/passwd", O_RDONLY);
  assert(fd > 0);
  posix_fadvise(fd, 0, 0, -1);
  return 0;
}
% /compat/linux/bin/gcc -m64 fadvice_bug.c -o fadvice_bug64
% truss ./fadvice_bug64
...
linux_fadvise64(0x3,0x0,0x0,0xffffffffffffffff)  ERR#-22 'Invalid argument'
...
% /compat/linux/bin/gcc -m32 fadvice_bug.c -o fadvice_bug32
% truss ./fadvice_bug32
...
linux_fadvise64(0x3,0x0,0x0,0x0)                 = 0 (0x0)
...

> amd64's 32-bit Linux syscall definition for fadvise64 looks right.

That's the weird part. It looks right to me as well, at least at first sight.

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