[Bug 697742] Re: strace: on i386, prints sync_file_range() arguments wrongly

[Adrien Nader]

I think that if this has not been fixed, this is not relevant anymore as
people would instead strace from the 64-bit side. Moreover, these cross-
world operations can be very difficult and are unlikely to change
further in the future even if this still happens.

** Changed in: strace (Ubuntu)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/697742

Title:
  strace: on i386, prints sync_file_range() arguments wrongly

Status in strace package in Ubuntu:
  Won't Fix

Bug description:
  Binary package hint: strace

  Package: strace
  Version: 4.5.20-2ubuntu2

  strace on i386 does not print the arguments to sync_file_range
  correctly:

  cam-vm-266:maverick:qemu$ cat /tmp/sync_file_range.c
  #define _GNU_SOURCE
  #include <stdio.h>
  #include <fcntl.h>

  int main(void) {
   int r;
   printf("calling sync_file_range()...\n");
   r = sync_file_range(42, 0x123456789abcdefULL, 0x1122334455667788ULL, 273750);
   printf("returned %d\n", r);
   return 0;
  }
  cam-vm-266:maverick:qemu$ gcc -g -Wall -o /tmp/sync_file_range /tmp/sync_file_range.c
  cam-vm-266:maverick:qemu$ strace /tmp/sync_file_range 2>&1 | grep '^sync_file_range'
  sync_file_range(0x2a, 0x89abcdef, 0x1234567, 0x55667788) = -1 EINVAL (Invalid argument)

  I think this is because strace doesn't know that the 2nd and 3rd
  arguments here are both off64_t so it's assuming it takes four 32 bit
  arguments. On x86_64 where a 64 bit value fits into one register
  anyway this bug doesn't occur.

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