2.5.60-63 panic: unable to mount root

2.5.60-63 panic: unable to mount root

[Joern Nettingsmeier]

hello everyone !

the kernel barfs and tells me to supply a root= kernel param.
i tried root=/dev/sda2, but no luck.

hw is all-scsi p2b-ds w/ dual p3/600.
boot is ext2, root (/dev/sda2) is reiserfs.
i'm using the new aic7xxx driver, the old driver one hangs at the same 
time, but continues to spit out a ton of error msgs i haven't bothered 
to capture, since i'm told it's deprecated.

the aic7xxx as well as ext2 and reiserfs are compiled into the kernel.
i'm not using devfs.

the system boots fine with 2.4.20.

google spit out these somewhat related threads, but they petered out 
without a solution.
www.uwsg.iu.edu/hypermail/linux/ kernel/0211.0/1564.html
www.cs.helsinki.fi/linux/linux-kernel/ 2002-47/0080.html

i'd welcome clues, and i'd be happy to run further tests if you tell me 
which :)

please cc: me on replies, i'm not subscribed, and the archives take ages 
to pick up new postings....

best,

jörn


-- 
If you're happy and you know it, bomb Iraq.

Jörn Nettingsmeier
Kurfürstenstr 49, 45138 Essen, Germany
http://spunk.dnsalias.org (my server)
http://www.linuxdj.com/audio/lad/ (Linux Audio Developers)

Re: 2.5.60-63 panic: unable to mount root

[xsdg]

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Hi... I saw your post in the lkml archives (I'm not subscribed either).  I think I'm having either a very similar problem, or the same problem that you are.

Similarities:
	Can't mount root, kernel panic
	Only happening in 2.5.62-ac1 (I haven't tried any other 2.5.6x kernels)

Differences:
	Using IDE root disc
	Using devfs
	root, which contains /boot, is ext3

I think something about device handling may have changed which is causing this problem. (for me, devfs started needing a root= option since about 2.5.50).  Additionally, when the kernel panics, does it specify the correct major/minor device number?  Mine uses the wrong one unless I use rdev, and then panics with the correct one (/dev/hda2, 0x0302)

These are the relevant entries in grub's menu.lst:

timeout 5
default 0

title   2.5.62 ac1
root    (hd0,1)
kernel  /boot/kernel/62.5.2k-ac1 root=/dev/ide/host0/bus0/target0/lun0/part2

title   2.5.51
root    (hd0,1)
kernel  /boot/kernel/51.5.2k-br root=/dev/ide/host0/bus0/target0/lun0/part2

the second entry works fine, but the first entry panics and gives me the same message you described.

	--xsdg
-- 
| Every child asks questinos.  I'm just still a     |
|   child.                                          |
|   -- Steven Hawking                               |
) http://www.cuodan.net/~xsdg/    xsdg@freenode.org (


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