diff --git a/psmisc-22.6-pstree-overflow.patch b/psmisc-22.6-pstree-overflow.patch
new file mode 100644
index 0000000..9ac75fc
--- /dev/null
+++ b/psmisc-22.6-pstree-overflow.patch
@@ -0,0 +1,11 @@
+diff -up psmisc-22.6/src/pstree.c.overflow psmisc-22.6/src/pstree.c
+--- psmisc-22.6/src/pstree.c.overflow	2008-04-14 12:53:07.000000000 +0200
++++ psmisc-22.6/src/pstree.c	2008-04-14 13:05:51.000000000 +0200
+@@ -608,6 +608,7 @@ read_proc (void)
+ 		perror (path);
+ 		exit (1);
+ 	      }
++            memset(readbuf, '\0', BUFSIZ + 1);
+             fread(readbuf, BUFSIZ, 1, file) ;
+             if (ferror(file) == 0) 
+             {
diff --git a/psmisc.spec b/psmisc.spec
index 7124b2f..a5dfa42 100644
--- a/psmisc.spec
+++ b/psmisc.spec
@@ -1,7 +1,7 @@
 Summary: Utilities for managing processes on your system
 Name: psmisc
 Version: 22.6
-Release: 5%{?dist}
+Release: 6%{?dist}
 License: BSD/GPLv2+
 Group: Applications/System
 Source: http://downloads.sourceforge.net/%{name}/%{name}-%{version}.tar.gz
@@ -9,6 +9,7 @@ URL: http://psmisc.sourceforge.net
 Buildroot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 Patch0: psmisc-22.6-types.patch
+Patch1: psmisc-22.6-pstree-overflow.patch
 
 BuildRequires: libselinux-devel
 BuildRequires: gettext
@@ -26,6 +27,7 @@ of processes that are using specified files or filesystems.
 %prep
 %setup -q
 %patch -p1 -b .types
+%patch1 -p1 -b .overflow
 
 %build
 export CFLAGS="$RPM_OPT_FLAGS -D_GNU_SOURCE"
@@ -66,6 +68,10 @@ rm -rf $RPM_BUILD_ROOT
 %endif
 
 %changelog
+* Mon Apr 14 2008 Tomas Smetana <tsmetana@redhat.com> 22.6-6
+- fix #441871 - pstree fails to show most processes;
+  patch by Emil Jerabek
+
 * Mon Apr 07 2008 Tomas Smetana <tsmetana@redhat.com> 22.6-5
 - fix configure.ac to include all the required headers for peekfd
 - remove kernel-headers again -- not needed in rawhide