If a compressed kdump is damaged/truncated such that the bitmap data

in the dumpfile header is not contained within the file, attempts
to analyze it with a vmlinux file, or using the "crash --osrelease"
or "crash --log" options with just the vmcore, will result in the
crash utility spinning forever, endlessly performing reads of 0 bytes
from the file without recognizing the EOF condition.
(dwysocha@redhat.com)

diskdump.c

@@ -618,7 +618,7 @@ read_dump_header(char *file)
 		len = bitmap_len;
 		while (len) {
 			bytes_read = read(dd->dfd, bufptr, len);
-			if (bytes_read  < 0) {
+			if (bytes_read <= 0) {
 				error(INFO, "%s: cannot read memory bitmap\n",
 					DISKDUMP_VALID() ? "diskdump"
 					: "compressed kdump");