strace: on i386, prints sync_file_range() arguments wrongly

Bug #697742 reported by Peter Maydell on 2011-01-05
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
strace (Ubuntu)
Undecided
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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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