Bug 70878 – dm-mod fails to load in >=sys-kernel/gentoo-dev-sources-2.6.8-r6

• Product: Gentoo Linux
• Status: RESOLVED INVALID

[Description John Ross Hunt 2004-11-11 15:25:28 UTC]

I use LVM2 as a root filesystem and boot using an initrd file (see http://forums.gentoo.org/viewtopic.php?t=169020&highlight=lvm2createinitrd) for my lvm2create_initrd script.  However, with kernels gentoo-dev-sources-2.6.8-r6 and beyond, dm-mod fails to load before the lvm2 partitions are activated.  This results in a kernel panic.  I've noticed that the device-mapper.h header in linux26-headers-2.6.8.1-r1 does not match the kernel starting with 2.6.8-r6.  I'm not certain this is the problem, but it's probably a good place to start looking.  Also, the latest LVM2 ebuild is lvm2-2.00.15-r1 and the latest stable version is LVM2.2.00.25.tgz.  Perhaps the newer kernels were produced using the latest LVM2 version?

Reproducible: Always
Steps to Reproduce:
1. emerge gentoo-dev-sources-2.6.8-r6 or greater.
2. create an initrd file using lvm2create_initrd.
3. boot the new kernel.

Actual Results:  
kernel panic.

Expected Results:  
not panic.

Portage 2.0.51-r3 (default-linux/x86/2004.0, gcc-3.4.2, glibc-2.3.4.20041102-r0,
2.6.8-gentoo-r4 i686)
=================================================================
System uname: 2.6.8-gentoo-r4 i686 Pentium III (Coppermine)
Gentoo Base System version 1.6.6
ccache version 2.3 [enabled]
Autoconf: sys-devel/autoconf-2.59-r5
Automake: sys-devel/automake-1.8.5-r1
Binutils: sys-devel/binutils-2.15.92.0.2-r1
Headers:  sys-kernel/linux26-headers-2.6.8.1-r1
Libtools: sys-devel/libtool-1.5.2-r7
ACCEPT_KEYWORDS="x86 ~x86"
AUTOCLEAN="yes"
CFLAGS="-march=pentium3 -O2 -pipe -fomit-frame-pointer"
CHOST="i686-pc-linux-gnu"
COMPILER=""
CONFIG_PROTECT="/etc /usr/X11R6/lib/X11/xkb /usr/kde/2/share/config
/usr/kde/3.3/share/config:/usr/kde/3.3/env:/usr/kde/3.3/shutdown
/usr/kde/3/share/config /usr/lib/mozilla/defaults/pref /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 -O2 -pipe -fomit-frame-pointer"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoaddcvs ccache distlocks sandbox sfperms"
GENTOO_MIRRORS="ftp://gentoo.chem.wisc.edu/gentoo"
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/portage"
SYNC="rsync://rsync.us.gentoo.org/gentoo-portage"
USE="S3TC X aac aalib accessibility acl adns aim alsa antlr apm arts async
audiofile avi bcel berkdb bitmap-fonts blender-game bonobo bsh bzlib cddb cdf
cdparanoia cdr clanJavaScript clanVoice cmucl codecs crypt cscope cups curl dga
dillo directfb divx4linux djbfft doc dts dv dvd dvdr editor edl encode escreen
esd evo exif expat f77 faac faad fam fbcon fbdev fdftk ffmpeg fftw flac
fluidsynth fmod foomaticdb fortran freetts freetype fs gb gcj gd gdbm gif gimp
gimpprint gkrellm glade glgd glut gmp gnome gnomedb gphoto2 gpm graphviz gs
gstreamer gtk gtk2 gtkhtml guile hbci icq icu idea ieee1394 image imagemagick
imlib imlib2 ipcs jabber jack java javadoc javamail javascript jbig jce jdepend
joystick jp2 jpeg jsch junit jython kde kerberos krb4 ladcca lcms ldap libcaca
libdsk libg++ libgda libsamplerate libwww live lm_sensors log4j lufsusermount
lynxkeymap lzo lzw lzw-tiff mad makecheck matroska mbrola md5sum mdb mikmod
mixer mmap mmx mng mono motif mozaccess mozcalendar mozdevelop mozilla mozp3p
mozplaintext mozsvg mozxmlterm mp3 mpeg mpeg4 mpi mplayer msdav msn music nas
native ncurses net netcdf network nls nntp no-opts nocd nptl ntlm nvidia objc
ocaml offensive ofx oggvorbis openal opengl opie optional-tasks oscar oss pam
pcap pda pdflib perl physfs plotutils png pnp portaudio ppds pthreads python qt
quicktime quotes readline regexp rhino rogue rtc ruby samba sasl scanner sdk sdl
silc slang slp smime soundtouch sox speedo speex spell sqlite src sse ssl svg
svga szip t1lib tcltk tcpd tetex tga theora threads tidy tiff timidity tlen
tools transcode truetype type1 unicode usb uudeview v4l v4l2 vim-with-x wifi wmf
wsconvert wxwin wxwindows x86 xalan xatrix xerces xine xml xml2 xmms xosd xpm
xrandr xsl xv xvid xvmc yahoo yv12 zlib video_cards_nvidia"

[Comment 1 John Ross Hunt 2004-11-11 15:26:56 UTC]

Created attachment 43747 [details]
Difference between /usr/include/linux/device-mapper.h and kernel version

[Comment 2 John Ross Hunt 2004-11-12 07:47:40 UTC]

Blarg!  File this one under DFU (Dumb F***ing User).  The problem arose with changes in glibc-2.3.4 that broke my 'lvm2create_initrd' script.  I posted a patch to the forum link above (for those who may be interested) that fixes the problem with files being moved about.  The script works now and my gentoo system also boots properly.  Case closed.  My apologies for the wasted bandwidth.

However, I'm still concerned about the difference in device-mapper.h in the kernel and userland.  Does anyone think that it may lead to problems?  Comments?   Suggestions?  Flames?

[Comment 3 John Ross Hunt 2004-11-12 07:51:51 UTC]

One last thing to mention.  I'm sticking with 2.6.8-r5, which is the last kernel with identical device-mapper.h between kernel and userland.  I haven't tested newer kernels because I want to be sure my data will be safe.  I'll leave this discrepency for the bug wranglers to ponder.  Sorry again for the wasted bandwidth.

[Comment 4 Daniel Drake (RETIRED) 2004-11-12 11:59:04 UTC]

The reason that the headers differ is because gentoo-dev-sources has some devicemapper fixes applied. The very small difference in header files won't make any difference at all, but if you like, you can just copy the one from /usr/src/linux into /usr/include/linux - once the dm-fixes get merged upstream, the linux26-headers includes will obviously also be updated