Bug 79295

Summary:	swapoff hangs when turning off swap, either manually, or when rebooting machine.
Product:	Gentoo Linux	Reporter:	Warren Spain <wspain>
Component:	[OLD] Unspecified	Assignee:	Gentoo's Team for Core System packages <base-system>
Status:	RESOLVED UPSTREAM
Severity:	critical
Priority:	High
Version:	unspecified
Hardware:	x86
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description Warren Spain 2005-01-24 01:02:43 UTC

When I try to turn the swapdisk off on my machine, either manually or during a reboot, the swapoff program will hang during the last 15 or so meg of the swap disk.  I have re-made the swap partition numerous times, and I have even gave up and tried using a different disk, to no avail.  It does it anyway.

Reproducible: Always
Steps to Reproduce:
1. reboot machine -or-
2. swapoff /dev/<disk>

Actual Results:  
swapoff hangs. 

Expected Results:  
software should have emptied swap, then disabled the swap space. 

Portage 2.0.51-r12 (default-linux/x86/2004.3, gcc-3.4.3, 
glibc-2.3.4.20041102-r0, 2.6.10-nitro4-mm-Tidus i686) 
================================================================= 
System uname: 2.6.10-nitro4-mm-Tidus i686 Pentium III (Katmai) 
Gentoo Base System version 1.6.8 
Python:              dev-lang/python-2.3.4 [2.3.4 (#1, Jan  7 2005, 09:57:25)] 
ccache version 2.3 [enabled] 
dev-lang/python:     2.3.4 
sys-devel/autoconf:  2.59-r6, 2.13 
sys-devel/automake:  1.8.5-r2, 1.5, 1.4_p6, 1.6.3, 1.7.9, 1.9.4 
sys-devel/binutils:  2.15.92.0.2-r2 
sys-devel/libtool:   1.5.10-r2 
virtual/os-headers:  2.6.8.1-r2 
ACCEPT_KEYWORDS="x86 ~x86" 
AUTOCLEAN="yes" 
CFLAGS="-march=pentium3 -O3 -pipe -fomit-frame-pointer -mmmx -msse 
-mfpmath=387,sse" 
CHOST="i686-pc-linux-gnu" 
CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3.3/env /usr/kde/3.3/share/config /usr/kde/3.3/shutdown /usr/kde/3/share/config /usr/lib/X11/xkb /usr/share/config /usr/share/texmf/dvipdfm/config/ /usr/share/texmf/dvips/config/ /usr/share/texmf/tex/generic/config/ /usr/share/texmf/tex/platex/config/ /usr/share/texmf/xdvi/ /var/qmail/control" 
CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d" 
CXXFLAGS="-march=pentium3 -O3 -pipe -fomit-frame-pointer -mmmx -msse 
-mfpmath=387,sse" 
DISTDIR="/usr/portage/distfiles" 
FEATURES="autoaddcvs autoconfig buildpkg ccache distlocks sandbox sfperms" 
GENTOO_MIRRORS="ftp://mirrors.tds.net/gentoo http://mirrors.tds.net/gentoo 
http://gentoo.seren.com/gentoo http://gentoo.mirrors.pair.com/" 
MAKEOPTS="-j2" 
PKGDIR="/usr/portage/packages" 
PORTAGE_TMPDIR="/var/tmp" 
PORTDIR="/usr/portage" 
PORTDIR_OVERLAY="/usr/local/portage" 
SYNC="rsync://rsync.gentoo.org/gentoo-portage" 
USE="X aac aalib acpi aim alsa apache2 apm arts audiofile avi bash-completion 
berkdb bidi bitmap-fonts bonobo cdr crypt cscope ctype cups dga dio divx4linux 
dvd dvdr dvdread encode esd ethereal f77 fam flac font-server foomaticdb 
fortran ftp gd gdbm gif gnome gpm gtk gtk2 gtkhtml icq imagemagick imlib ipv6 
java joystick jpeg kde libg++ libwww mad maildir mbox mikmod mmx motif mozilla 
mpeg msn mysql ncurses nls nptl nvidia oggvorbis openal opengl oscar oss pam 
pdf pdflib perlphp pic pie png posix python qt quicktime readline samba sdl 
spell sse ssl svgatcpd tetex theora tiff truetype truetype-fonts type1-fonts 
usb wmf wxwindows x86 xine xinerama xml xml2 xmms xscreensaver xv xvid zlib" 
Unset:  LDFLAGS

Comment 1 Warren Spain 2005-01-24 01:11:27 UTC

forgot the version of util-linux (the package which provides swapon/off).

* sys-apps/util-linux
      Latest version available: 2.12p
      Latest version installed: 2.12p
      Size of downloaded files: 3,922 kB
      Homepage:    http://www.kernel.org/pub/linux/utils/util-linux/
      Description: Various useful Linux utilities
      License:     GPL-2

Comment 2 SpanKY gentoo-dev

2005-01-25 06:40:39 UTC

does 2.12i exhibit the same behavior ?
could you perhaps try it with a normal kernel ?
does `dmesg` show anything ?

Comment 3 Warren Spain 2005-01-25 22:43:08 UTC

Backed down to 2.12i-r1 (marked stable on all architectures) and under any 2.6.10 nitro kernel, it still hangs up.  Decided to try gentoo-dev-sources 2.6.10-r5, and sad to say, it works like it should (both 2.12i and 2.12p) under the same test case (opening enough applications and files to drive swap usage to 50M, then turning off swap with everything open).  I will move this bug to that particular patchset's author, and change the status to "Moved Upstream".