Bug#570889: #570889 ant: FTBFS on kfreebsd-* and hppa: Bus error

[Petr Salinger]

Hi,

the current ant fails during build in

| Copying 5 files to /build/buildd-ant_1.8.0-2-kfreebsd-i386-RIfTK_/ant-1.8.0/build/classes
| Bus error

I tried to understand what is going wrong.
The important part of ktrace seems be this:

  14997 gij-4.4  CALL  fstat(0xa,0xbfbf29ec)
  14997 gij-4.4  STRU  size=1701
  14997 gij-4.4  RET   fstat 0
  14997 gij-4.4  CALL  mmap(0,0x2000,PROT_READ,MAP_PRIVATE,0xa,0,0)
  14997 gij-4.4  RET   mmap 712716288/0x2a7b3000
  14997 gij-4.4  PSIG  SIGBUS SIG_DFL

The file, which have to be copied, have size 1701,
but two pages (2*4096) are mmaped. It is allowed on both
Linux and FreeBSD.
When the 2nd page of that file would be accessed, it would
generate SIGBUS.

The question is of course whether it really happens and why ?

Petr

gcc tst.c -o tst
tst < tst.c

-------------------------------
     #include <stdio.h>
     #include <sys/mman.h>

      int main()
      {

      char *p = mmap(0, 8192,PROT_READ,MAP_PRIVATE,0,0);

      fprintf(stderr, "%p %d\n", p, p[55]);
      fprintf(stderr, "%p %d\n", p, p[4095]);
      fprintf(stderr, "%p %d\n", p, p[4096]);
      fprintf(stderr, "%p %d\n", p, p[7796]);
      };

-----------

  14997 gij-4.4  CALL  open(0x8e59e58,O_RDONLY|O_LARGEFILE,<unused>0)
  14997 gij-4.4  NAMI 
"/home/bd/ant/src/main/org/apache/tools/ant/listener/defaults.properties"
  14997 gij-4.4  RET   open 10/0xa
  14997 gij-4.4  CALL  stat(0xbfbf2950,0xbfbf28c8)
  14997 gij-4.4  NAMI 
"/home/bd/ant/src/main/org/apache/tools/ant/listener/defaults.properties"
  14997 gij-4.4  STRU  struct stat {dev=68, ino=261382, mode=-rw-r--r-- , 
nlink=1, uid=1000, gid=1000, rdev=1073358, atime=1267097252, 
stime=1215765502, ctime=1267095424, birthtime=1215765502, size=1701, 
blksize=4096, blocks=4, flags=0x0 }
  14997 gij-4.4  RET   stat 0
  14997 gij-4.4  CALL 
open(0x8e2ec80,O_WRONLY|O_CREAT|O_TRUNC,<invalid>438)
  14997 gij-4.4  NAMI 
"/home/bd/ant/build/classes/org/apache/tools/ant/listener/defaults.properties"
  14997 gij-4.4  RET   open 11/0xb
  14997 gij-4.4  CALL  gettimeofday(0xbfbf29ec,0)
  14997 gij-4.4  RET   gettimeofday 0
  14997 gij-4.4  CALL  fstat(0xb,0xbfbf28fc)
  14997 gij-4.4  STRU  struct stat {dev=68, ino=98035, mode=-rw-r--r-- , 
nlink=1, uid=1000, gid=1000, rdev=0, atime=1267097828.537268496, 
stime=1267097828.537268496, ctime=1267097828.537268496, 
birthtime=1267097828.537260486, size=0, blksize=4096, blocks=0, flags=0x0 
}
  14997 gij-4.4  RET   fstat 0
  14997 gij-4.4  CALL  futimes(0xb,0xbfbf29e4)
  14997 gij-4.4  RET   futimes 0
  14997 gij-4.4  CALL  stat(0xbfbf2920,0xbfbf2898)
  14997 gij-4.4  NAMI 
"/home/bd/ant/build/classes/org/apache/tools/ant/listener/defaults.properties"
  14997 gij-4.4  STRU  struct stat {dev=68, ino=98035, mode=-rw-r--r-- , 
nlink=1, uid=1000, gid=1000, rdev=0, atime=1267097828, 
stime=1267097828.538945000, ctime=1267097828.539347276, 
birthtime=1267097828.537260486, size=0, blksize=4096, blocks=0, flags=0x0 
}
  14997 gij-4.4  RET   stat 0
  14997 gij-4.4  CALL  fstat(0xa,0xbfbf29ec)
  14997 gij-4.4  STRU  struct stat {dev=68, ino=261382, mode=-rw-r--r-- , 
nlink=1, uid=1000, gid=1000, rdev=1073358, atime=1267097252, 
stime=1215765502, ctime=1267095424, birthtime=1215765502, size=1701, 
blksize=4096, blocks=4, flags=0x0 }
  14997 gij-4.4  RET   fstat 0
  14997 gij-4.4  CALL  mmap(0,0x2000,PROT_READ,MAP_PRIVATE,0xa,0,0)
  14997 gij-4.4  RET   mmap 712716288/0x2a7b3000
  14997 gij-4.4  PSIG  SIGBUS SIG_DFL