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#uml IRC Logs for 2007-10-09

---Logopened Tue Oct 09 00:00:36 2007
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10:59<jdike-#uml->>Hi guys
11:01<caker-#uml->>hello jeff
11:02<caker-#uml->>I downgraded to 2.6.21 and so far it's working .. but, I had a user report http://pastebin.mindbender.ca/52 today
11:04<jdike-#uml->>that's the same as yesterday, right?
11:04<jdike-#uml->>and not on 2.6.21?
11:07<caker-#uml->>same as yesterday... 2.6.21.1 was ran for months, across many Linodes, without any reports of that error
11:08<jdike-#uml->>OK
11:09<jdike-#uml->>you have a known good kernel and a known bad one, so you can bisect it
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14:31<remus-#uml->>hello everyone !
14:31<remus-#uml->>I downloaded the UML kernel/root fs from the web site and ran the thing according to the instructions but it doesn't work
14:32<remus-#uml->>it hangs on boot:
14:32<remus-#uml->>Starting system message bus: [ OK ]
14:32<remus-#uml->>Mounting other filesystems: [ OK ]
14:32<remus-#uml->>Generating SSH1 RSA host key: [FAILED]
14:32<remus-#uml->>Starting crond: [ OK ]
14:32<remus-#uml->>INIT: Id "c0" respawning too fast: disabled for 5 minutes
14:32<remus-#uml->>INIT: no more processes left in this runlevel
14:33<remus-#uml->>INIT: Id "c0" respawning too fast: disabled for 5 minutes
14:33<remus-#uml->>INIT: Id "c0" respawning too fast: disabled for 5 minutes
14:33<remus-#uml->>any ideas ?
14:36<remus-#uml->>anyone out there ?
14:38<jdike-#uml->>your inittab is wrong somehow
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14:44<remus-#uml->>jdike: I used the filesystem that is posted on the website
14:44<jdike-#uml->>which web site?
14:44<remus-#uml->>jdike: http://user-mode-linux.sourceforge.net/
14:45<remus-#uml->>jdike: is there a different one that I should use ?
14:45<jdike-#uml->>what was the UML command line?
14:45<remus-#uml->>./linux-2.6.22-rc2 ubda=FedoraCore5-x86-root_fs mem=128M
14:48<remus-#uml->>jdike: how did you buid your UML environment ?
14:55<jdike-#uml->>mostly by upgrading existing environments
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15:01<jdike-#uml->>Works OK here
15:03<remus-#uml->>jdike: can you please point me to proper instructions ?
15:04<jdike-#uml->>those are the proper instructions
15:04<remus-#uml->>jdike: the ones on the site ?
15:04<jdike-#uml->>yes
15:05<remus-#uml->>how do I build a root filesystem from an existing machine ?
15:05<remus-#uml->>they don't say that ...
15:06<remus-#uml->>how do you "upgrade existing environments" ?
15:06<jdike-#uml->>you also used the kernel from the site?
15:06<remus-#uml->>yes
15:06<jdike-#uml->>and you didn't change anything anywhere?
15:07<remus-#uml->>nope, I just downloaded, unpacked and ran the command
15:08<jdike-#uml->>can you paste the full boot log someplace
15:08<jdike-#uml->>like rafb.net
15:08<remus-#uml->>sure
15:09<jdike-#uml->>like rafb.net
15:10<jdike-#uml->>um
15:10<jdike-#uml->>you need to get a 64-bit filesystem
15:11<jdike-#uml->>will you stop pasting?
15:11<jdike-#uml->>annoying as hell
15:11<jdike-#uml->>will you stop pasting?
15:12<jdike-#uml->>I don't need to see the same crap 3 times
15:14<remus-#uml->>I posted that on a private dialog box with you
15:14<remus-#uml->>is that the problem ?
15:14<remus-#uml->>I already pasted the messages
15:14<remus-#uml->>sorry but I already pasted it
15:14<remus-#uml->>anyway, thanks ... I'll try on a 32 bit system or I'll get a 64 bit FS
15:14<jdike-#uml->>after I asked about 10 time not to?
15:15<jdike-#uml->>well, it shouldn't even have gotten that far
15:15<Magotari-#uml->>remus: Creating a root_fs from a real system: dd if=/dev/your_existing_partition_on_a_real_machine of=root_fs. Then edit inittab and fstab of root_fs. It worked for me.
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15:15<Magotari-#uml->>Assuming you have everything on one partition, that is.
15:15<jdike-#uml->>can you paste the same stuff on rafb.net?
15:15<jdike-#uml->>NOT A PM
15:21<remus-#uml->>jdike: sorry, I have to go ... I'll be back later
15:21<remus-#uml->>I can't connect to rafb.net
15:21<remus-#uml->>is that an IRC server ?
15:22<Magotari-#uml->>Google it.
15:22<Magotari-#uml->>http://www.rafb.net/paste/
15:23<Magotari-#uml->>Or use this: http://pastebin.com/
15:23<Magotari-#uml->>Pasting long stuff in irc is generally a *B*A*D* idea.
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16:14<caker-#uml->>Linus just released 2.6.23
16:14<caker-#uml->>jdike: want me to paste you the changelog?
16:15<jdike-#uml->>ooh
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16:15<jdike-#uml->>paste me the changelog and you'll get the same treatment as remus
16:15<jdike-#uml->>i.e. a failed attempt to /ignore him
16:15<jdike-#uml->>be very scared
16:16[~]caker #uml quivers, but is still tempted#uml-> quivers, but is still tempted
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16:22<Magotari-#uml->>caker: Pasting the whole source code could be more informative. :)
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17:36<remus-#uml->>jdike: so you said you wanted me to paste the log here on this channel ?
17:37<remus-#uml->>jdike: here is the UML startup log: http://rafb.net/p/Ms0SH151.html
17:39<remus-#uml->>Magotari: I could run UML by using the /dev/partition directly, no ?
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18:33<jdike-#uml->>check_sysemu got system call number -38, expected 20...check_ptrace : child exited with status 2.
18:33<jdike-#uml->>Disabling SYSEMU support.
18:34<jdike-#uml->>There is this - I don't see how it affects getty
18:34<jdike-#uml->>remus, no, you can't
18:35<remus-#uml->>jdike: I tried it out already and it didn't work ;-)
18:35<jdike-#uml->>it should be obvious, too
18:35<remus-#uml->>jdike: I posted the log on rafb
18:35<jdike-#uml->>you can't have two filesystems independently caching the same device
18:36<jdike-#uml->>then there's this:
18:36<jdike-#uml->>Starting udev: /sbin/start_udev: line 202: 671 Bus error /sbin/udevd -d
18:36<jdike-#uml->>/sbin/start_udev: line 202: 672 Bus error /sbin/udevstart
18:36<jdike-#uml->>[FAILED]
18:36<jdike-#uml->>which I could see affecting getty
18:36<jdike-#uml->>either by getty getting the same bus error, or by the udev stuff not making /dev/tty0
18:37<remus-#uml->>jdike: I an running FC7 64 bit ... is that why I get the bus error ?
18:37<jdike-#uml->>hmm
18:37<jdike-#uml->>there were bugs there
18:38<jdike-#uml->>what does uname -a say on the host?
18:38<remus-#uml->>Linux remus-lt 2.6.22.9-91.fc7 #1 SMP Thu Sep 27 20:47:39 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
18:38<jdike-#uml->>relatively modern
18:39<jdike-#uml->>I did fix a couple of host bugs, but I don't remember when they went to mainline
18:40<remus-#uml->>jdike: hmmm ... I have FC6 32 bit ... let me try on that
18:41<jdike-#uml->>that'll be fine
18:41<jdike-#uml->>can you try 2.6.23 on the host?
18:41<remus-#uml->>as UML ?
18:42<jdike-#uml->>on the host
18:42<remus-#uml->>jdike: or boot my machine on 2.6.23 ?
18:42<jdike-#uml->>yes
18:42<remus-#uml->>I'll have to compile that first ...
18:42<remus-#uml->>do you think that could fix it ?
18:44<jdike-#uml->>if it doesn't, there are more host bugs that need fixing
18:44<jdike-#uml->>but 32-bit on 64-bit worked for me last time I checked
18:47<remus-#uml->>jdike: if 'df' tells me this
18:47<remus-#uml->>/dev/mapper/VolGroup00-LogVol00
18:47<remus-#uml->> 68G 34G 31G 53% /
18:47<remus-#uml->>I have to dd if=/dev/mapper/VolGroup00-LogVol00 of=rootfs ?
18:48<jdike-#uml->>I guess
18:48<jdike-#uml->>you can also loop-mount rootfs and cp -a into it
18:49<jdike-#uml->>then you don't have to have a rootfs the same size as /
18:50[~]linbot #uml dispenses Pez#uml-> dispenses Pez
18:50<remus-#uml->>oh, that's a better idea ... I still have to copy the whole root, no ?
18:50<remus-#uml->>it would be a pain to select which files I need and which I don't
18:50<remus-#uml->>the dd didn't work
18:51<jdike-#uml->>you can leave out /home
18:52<jdike-#uml->>if you cp, make sure you tell it not to leave the filesystem
18:53<remus-#uml->>jdike: what do you mean ? so it doesn't cp mounted filesystems ?
18:53<jdike-#uml->>cp -a will by default copy everything, /home, /nfs, etc
18:54<jdike-#uml->>you want it to stay on /
18:56<remus-#uml->>jdike: ok, so I create the rootfs, them I compile the kernel with ARCH=um and it should work ?
18:56<jdike-#uml->>yup
18:57<jdike-#uml->>make sure you match the filesystem bit-ness with the kernel bit-ness
18:57<jdike-#uml->>32 with 32, etc
18:58<remus-#uml->>jdike: how do I tell it to compile a 64 bit kernel ?
18:58<jdike-#uml->>build on a 64-bit host
18:58<remus-#uml->>jdike: ok
18:59<remus-#uml->>jdike: thanks for the help ... I'll let you know how it worked
18:59<jdike-#uml->>np
19:05<remus-#uml->>jdike: how do I debug stuff on the UML kernel ? I have to build a kdb version ?
19:05<jdike-#uml->>gdb
19:05<jdike-#uml->>it's a normal process
19:06<remus-#uml->>hmmm ... that's cool
19:06<remus-#uml->>it motivates me to get it working ;-)
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---Logclosed Wed Oct 10 00:00:10 2007