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#uml IRC Logs for 2007-05-09

---Logopened Wed May 09 00:00:06 2007
00:08|-|Guest5 changed nick to weasel
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09:32|-|jdike [~jdike@pool-71-174-247-179.bstnma.fios.verizon.net] has joined #uml
09:32<jdike>Hi guys
09:34|-|weasel changed nick to weaselxxx
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09:35<peterz>hey jdike
09:35<jdike>so, irqstacks survived an ovenight stress run
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10:14[~]jdike cuts the kernel stack size in half
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11:57<jdike>Looks like I can go to 4K stacks on i386 at least
12:00<kokoko1>Hiya jdike :)
12:00<jdike>hey
12:36<jdike>4K won't work on x86_64
12:36<jdike>Greatest stack depth - 3604 bytes left
12:38<jdike>Greatest stack depth - 2904 bytes left
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12:53<jdike>4K doesn't seem to make kernel builds any faster, but it felt faster booting up
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13:26<scoates>I just moved my UML stuff to a new box and it's hanging on boot:
13:26<scoates> * Configuring network interfaces... [ OK ] line_ioctl: tty0: unknown ioctl: 0x541e
13:26<scoates>line_ioctl: tty0: unknown ioctl: 0x5603
13:26<scoates>hwclock is unable to get I/O port access: the iopl(3) call failed.
13:27<scoates>both 2.6.18 and 2.6.21... ideas?
13:33<jdike>Put a -x on the #!line of the last script that ran
13:35<scoates>ok
13:43<kokoko1>anynoe hear of indonesian dude ? :)
13:43<kokoko1>i always forget his nick
13:44<jdike>the-hydra
13:45<kokoko1>:D
13:45<scoates>jdike: ok, I changed it to #!/bin/sh -x
13:45<scoates>now: * Activating swapfile swap... [ OK ] /bin/sh: Illegal option -
13:46<jdike>.your shell doesn't have -x?
13:48<scoates>seems not
13:48<scoates>I can't run it from a mount because of a GLIBC conflict
13:49<jdike>you can if you chroot
13:51<scoates>ah, true
13:51<scoates>sec
13:51<scoates>disabling swap, first
13:52<scoates>aha
13:52<scoates>it's not the swap script anyway
13:52<scoates>ok.. what's -x supposed to do?
13:52<scoates>I don't see it in man sh
13:53<scoates>sh -x works in chroot
13:58<scoates>is there something else I should be looking for on the console?
14:00<scoates>brb
14:01|-|max [~max@ADijon-151-1-40-35.w83-196.abo.wanadoo.fr] has joined #uml
14:01<max>Hi everyone
14:02<max>Can anyone help me with uml on the same lan of my host ?
14:18<scoates>hrm.. it seems that no matter what I do, it stops at "configuring network interfaces"
14:19<max>??
14:21<max>Can you explain what you mean ?
14:23<scoates>I wasn't trying to answer your question (-: but I have a UML that won't boot, completely..
14:25<max>oh ok
14:25<scoates>hmm
14:25<max>is it your first time with uml ?
14:25<scoates>if I start it without screen, I get different behaviour
14:25<scoates>no, I had it working on another box.
14:25<max>ok
14:26<max>well i think i can't help you i just begin with UML 2 days ago
14:27<scoates>jdike: http://www.phparch.com/~sean/uml.log that's what I'm getting now... ??
14:28<scoates>F_SETLK failed, file already locked by pid 25784 <--- that process doesn't exist
14:28<scoates>and it's the same number each time I launch uml
14:34<scoates>ugh.. so I made a copy of the "locked" root fs, and now it's booting again, but only up to the network prompt...
14:51<jdike>there are some left-over UML processes
14:51<jdike>-x turns on tracing mode
14:51<jdike>it'll dump the commands that the shell runs
14:51<scoates>well, -x generated no additional output
14:52<scoates>sec, I'll check to ensure all existing uml instances are dead
14:54<scoates>ps auxwww | grep linux returns nothing; I'm going to try a brand new root image to see if that helps..
15:26<scoates>hurray new problems..
15:26<scoates>mta-training:~# ifup eth0
15:26<scoates>##@######N####@######5######@########@
15:26<scoates>####@7###@#@#@#@#@#@#@#@##########################################@@@
15:26<scoates>@@@@@@@@@!@#@%@'@)@+@-@/@1@3@5@7@9@;@=@?@A@C@E@G@I@K@M@O@Q@S@U@W@Y@[@]@_@a@c@e@g@i@k@m@o@q@s@u@w@y@{@}@@@@ @@@@@@@@@@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@##################SIOCSIFFLAGS: Operation not permitted
15:26[~]scoates fetches a drink
15:33<jdike>what the hell?
15:33<scoates>indeed
15:34<scoates>the junk before SIOCS... changes every time I ifup it
15:35<jdike>Using tuntap?
15:35<scoates>yes
15:35<jdike>what does dmesg?
15:35<jdike>say?
15:35<scoates>I halted.. need a min
15:36<jdike>it almost looks like it thinks fd 0 is the network and it's sending protocol there
15:36<scoates>fd 0?
15:36<jdike>stdout
15:36<scoates>ah
15:36|-|richardw [~richardw@M247P013.adsl.highway.telekom.at] has quit [Remote host closed the connection]
15:38<scoates>aha
15:38<scoates>looking better: helper_child - execvp of 'uml_net' failed - errno = 13
15:39<scoates>(that's from dmesg)
15:40<scoates>checking the host for uml_net
15:41<jdike>that's EPERM
15:41<jdike>if this is Debian or a derivative, you need to be in group uml_net
15:41<scoates>aha
15:41<scoates>it is
15:42<scoates>uml-net
15:43<scoates>ok.. I'm still not sure how to solve the flocking problem.. any ideas?
15:44<jdike>you're positive you have no remnant UML processes?
15:44<scoates>unless they're somehow not named linux[.uml]
15:44<scoates>there are none
15:44<jdike>they might not be
15:44<scoates>uml_switch?
15:44<jdike>that one is fine
15:45<scoates>sec
15:46<scoates>installing lsof
15:50<scoates>this is getting weirder
15:50<scoates>uml@mail2:~$ ps auxwww | grep 26402
15:50<scoates>uml 26402 0.0 0.0 756 732 ? T 15:25 0:00
15:50<scoates>guess that's the mystery process
15:51<jdike>yup
15:51<jdike>Mr. Nameless
15:51<scoates>and it won't die
15:51<scoates>should kill -9 it?
15:51[~]scoates fears the worst
15:51<jdike>it should
15:51<jdike>don't worry
15:51<jdike>kill -CONT it
15:52<scoates>ok
15:52<scoates>that killed it
15:52<scoates>starting uml again
15:52<scoates>(now that I'm in the right group)
15:53<scoates>sorry for all this noise, btw.. I've just been having a particularly hard time with this
15:58<scoates>ok... progress
15:58[~]scoates goes back to refresh on weird networking setups (-:
16:00<max>jdike can you give me some advice ? still on networking ?
16:01<jdike>what's the problem?
16:01<max>well here is the initial point : i have a gw 192.168.1.1 and my host has an interface eth0 with 192.168.1.10
16:02<max>i want to be able to ping my gw from my uml without having to touch the route table of my gw
16:02<max>how could i do that ?
16:07<jdike>you don't need to in this case
16:08<jdike>assuming you have a /24 net
16:08<max>yes i have
16:08<max>is it still with the tap0 interface?
16:09<jdike>Oh, what subnet is the UML on?
16:09<max>still on 192.168.1.XXX
16:09<max>on the same as the host eth0
16:10<jdike>then the gw doesn't need any more routing
16:10<max>ok
16:11<jdike>there is nothing UML specific here
16:12<jdike>just pretend you're setting up a new ethernet connected to your normal one through the host
16:12<max>you mean eth1 on the host for example ?
16:13<jdike>yeah
16:13<jdike>except it happens to be called tap0
16:13<jdike>it's exactly the same
16:14<max>so i still have to create tap0
16:14<jdike>yup, and set it up as you already have
16:15<jdike>but the proxy arp, forwarding, and routing are the same at that point as an eth1
16:15<max>well it's not working see the command line i write :
16:16<max>tunctl -u 0 -t tap0
16:16<max>ifconfig tap0 192.168.1.100 up
16:16<max>echo 1 > /proc/sys/net/ipv4/ip_forward
16:16<max>route add -host 192.168.1.101 dev tap0
16:16<max>echo 1 > /proc/sys/net/ipv4/conf/tap0/proxy_arp
16:16<max>arp -Ds 192.168.1.101 eth0 pub
16:17<max>and finally Noyaux/linux-2.4.27 umid=ordi1 ubd0=cow01,SysFich/root_fs_slack8.1 eth0=tuntap,tap0
16:17<max>what do you think ?
16:17<jdike>looks OK
16:18<max>then i'm bringing up eth0 with ip 192.168.1.101 but i can't ping 192.168.1.100
16:18<jdike>firewall?
16:19<max>desactivate
16:19<jdike>iptables -L
16:19<max>both of them iptable and shorewall
16:19<jdike>iptables -L just gives you back a prompt?
16:19<max>yes
16:19<max>all in accept on input output and forward
16:20<jdike>yeah
16:20<jdike>just empty lists?
16:20<max>yes
16:20<jdike>tcpdump tap0
16:24<max>nothing
16:24<max>but here is another weird thing
16:25<max>when i'm configuring an ip on tap0, then i can't ping 192.168.1.1 on the host
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16:30<max>any suggestions ?
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16:37<scoates>ok.. servers are up and running (after a host reboot scare)
16:38<max>good thing :-)
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16:39<scoates>now.. here's a problem: host's ip is x.y.34.155 assigned UML IP is: x.y.45.180 when I start the uml network, I get: SIOCADDRT: Network is unreachable ideas?
16:40<scoates>do I need to change the host's netmask? can I maybe not use tap? (it's tapping x.y.34.155, and they're not on the same 255.255.255.0)
16:41<cosmol>255.255.0.0
16:41<scoates>the host?
16:41<cosmol>both should have that netmask
16:41<scoates>ok
16:43<cosmol>assuming you want them to think they are on the same subnet
16:43<scoates>I don't care if they think they're on the same net. I just want .45.180 to be able to route through the host
16:44<scoates>I'll try 255.255.0.0
16:45<scoates>whee
16:45<scoates>thank you cosmol and jdike
16:46<scoates>MUCH appreciated
16:47<cosmol>what io schedulers do you guys uses, is it smart to use noop on the guest and cfq on the host?
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---Logclosed Thu May 10 00:00:40 2007