@ccaffy - I test with this small patch to inject a fault:

--- a/src/XrdOss/XrdOssApi.cc
+++ b/src/XrdOss/XrdOssApi.cc
@@ -884,8 +884,13 @@ ssize_t XrdOssFile::Read(void *buff, off_t offset, size_t blen)
            else   retval = cxobj->Read((char *)buff, blen, offset);
         else 
 #endif
+     if (offset < 64*1024) {
              do { retval = pread(fd, buff, blen, offset); }
                 while(retval < 0 && errno == EINTR);
+     } else {
+        errno = EIO;
+        retval = -1;
+     }
 
      return (retval >= 0 ? retval : (ssize_t)-errno);
 }

Any reads after 64KB will fail (though, since reads are issued as 1MB chunks, the test file needs to be >1MB).

Note that you'll need to add --raw -v to the curl command to see the trailer. Sadly trailers aren't printed by -v by default.

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