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#uml IRC Logs for 2007-04-19

---Logopened Thu Apr 19 00:00:09 2007
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10:25|-|jdike [~jdike@pool-71-174-247-179.bstnma.fios.verizon.net] has joined #uml
10:25<jdike>Hi guys
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10:55<baroni>hi jdike
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12:05<aroscha_>hi
12:05[~]aroscha_ is ready to break things... new kernel... here we go
12:11<jdike>time sleep 10
12:11<jdike>real 0m0.020s
12:14<aroscha_>wow
12:14<aroscha_>slow :)
12:16<jdike>time on my host goes backwards sometimes
12:16<jdike>funky
12:16<jdike>and intervals are very erratic
12:16<aroscha_>tell it to slow down to sub speed of light please ;-)
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12:58<aroscha_>if i start the 2.6.16-bs2 release from http://www.user-mode-linux.org/~blaisorblade/binaries/2.6.16.9-bs2/ then I get:
12:58<aroscha_>Out of Memory: Kill process 2 (ksoftirqd/0) score 0 and children.
12:58<aroscha_>Out of Memory: Kill process 2 (ksoftirqd/0) score 0 and children.
12:58<aroscha_>Out of Memory: Kill process 2 (ksoftirqd/0) score 0 and children.
12:58<aroscha_>Out of Memory: Kill process 2 (ksoftirqd/0) score 0 and children.
12:58<aroscha_>Out of Memory: Kill process 2 (ksoftirqd/0) score 0 and children.
12:58<aroscha_>Out of Memory: Kill process 2 (ksoftirqd/0) score 0 and children.
12:58<aroscha_>Out of Memory: Kill process 2 (ksoftirqd/0) score 0 and children.
12:58<aroscha_>Out of Memory: Kill process 2 (ksoftirqd/0) score 0 and children.
12:58<aroscha_>etc
13:04<jdike>looks like it wants more memory
13:07<aroscha_>ok, added mem=128M and now I have :
13:07<aroscha_>request_module: runaway loop modprobe binfmt-464c
13:07<aroscha_>and freeze
13:07<aroscha_>ah!
13:08<aroscha_>and the Out of Memory: Kill process 2 (ksoftirqd/0) score 0 and children. messages just simply come later
13:23<jdike>that means you're tryng to boot a 32-bit fs on a 64-bit UML
13:41<aroscha_>hm... or a 64 bit rootfs on a 32 bit guest in a 64 bit host
13:42<jdike>that's what I said
13:42<jdike>whoops it not
13:42<jdike>it's
13:42|-|flatronf700B [~flatronf7@202.75.186.154] has quit [Ping timeout: 480 seconds]
13:44<aroscha_>:)
13:44<aroscha_>anyway, yes, we agree
13:45<aroscha_>so my test intention was actually to run SKAS3 mode finally
13:46<jdike>it doesn't really work on x86_64
13:46<aroscha_>yes
13:46<aroscha_>i noticed
13:46<aroscha_>:)
13:46<jdike>/proc/mm isn't good
13:46<aroscha_>but i still wanted to make it work
13:46<jdike>PTRACE_FAULTINFO is OK
13:46<aroscha_>i know, it crashes
13:46<aroscha_>but how can we make it work?
13:47<jdike>not sure, ask BB about that
13:47<aroscha_>thought so :)
13:47<jdike>he added a /proc/mm64, so I guess there was some unfixable 64-bit problem with /proc/mm
13:48<aroscha_>another question about harald welte's mcast additions:
13:51<aroscha_>hmm... need some time... later
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14:23<aroscha_>jdike: ok, well eth0=mcast (harald's addition)...
14:25<aroscha_>i started an instance as described in the docs with eth0=mcast,,224.2.3.4:5555,3 but ... when i try to get the eth0 interface up inside then guest then I simply get a # ifconfig eth0 inet 224.2.3.4
14:25<aroscha_>ifconfig: SIOCSIFADDR: Invalid argument. Why? Sorry again if this sounds like a stupid question.
14:25<jdike>anything in dmesg?
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14:42<aroscha_>no
14:42<aroscha_>hm... I guess I will add an strace to my guest root_fs
14:43<jdike>you can strace it from a shell, right?
14:43<aroscha_>the ifconfig cmd?
14:43<jdike>yeah
14:44<aroscha_>no, i need to add it to my busybox root_fs
14:45<jdike>how are you getting 'ifconfig: SIOCSIFADDR: Invalid argument' if you don't have ifconfig
14:46<aroscha_>misunderstanding! of course I have ifconfig but i did not have strace
14:46<aroscha_>so it seems that i need the netlink sockets
14:46<aroscha_>socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
14:46<aroscha_>socket(PF_NETLINK, SOCK_RAW, 0) = 4
14:46<aroscha_>bind(4, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 0
14:46<aroscha_>getsockname(4, {sa_family=AF_NETLINK, pid=645, groups=00000000}, [4294967308]) = 0
14:46<aroscha_>sendto(4, "\24\0\0\0\26\0\1\3\314\306\'F\0\0\0\0\0\0\0\0", 20, 0, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 20
14:46<aroscha_>recvmsg(4, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"\24\0\0\0\3\0\2\0\314\306\'F\205\2\0\0\0\0\0\0\0\0\0\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 20
14:46<aroscha_>close(4) = 0
14:46<aroscha_>brk(0) = 0x676000
14:46<aroscha_>brk(0x697000) = 0x697000
14:46<aroscha_>ioctl(3, SIOCSIFADDR, 0x7f7fb206f0) = -1 EINVAL (Invalid argument)
14:46<aroscha_>write(2, "ifconfig: ", 10ifconfig: ) = 10
14:46<aroscha_>write(2, "SIOCSIFADDR", 11SIOCSIFADDR) = 11
14:46<aroscha_>write(2, ": Invalid argument\n", 19: Invalid argument
14:47<aroscha_>) = 19
14:47<aroscha_>exit_group(1) = ?
14:47<aroscha_>Process 645 detached
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14:47<aroscha_>nope, it has netlink
14:47<aroscha_>but the ioctl complained
14:50<aroscha_>seems like it somehow does not like the device
14:51<aroscha_>shouldn't we also be seeing some ioctl(SIOCADDMULTI, ... ) somwhere in the trace? Just wondering. After all we are talking about multicast
14:51<jdike>no
14:51<jdike>multicast is on the host, inside UML, it's a normal ethernet device
14:51<aroscha_>ah!
14:53<aroscha_>makes sense
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15:00<aroscha_>and here is why it breaks: i tried to assign the eth0 inside the multicast group addr.. doh!
15:00<aroscha_>:)
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17:50<wyvern>I added a very simple syscall to the kernel and it builds just fine, but i can't figure out how to actually compile code that links against my modified kernel source
17:50<wyvern>I'm putting -Ipath/to/modified/kernel/src in my compile line but i get tons of errors
17:51<wyvern>I get a lot of this: ../linux-2.6.20.4/include/linux/list.h:902:2: warning: #warning "don't include kernel headers in userspace"
17:51<wyvern>that doesn't make sense to me, since it seems totally normal to include kernel headers in userspace... after all, they're in /usr/include/linux anyway
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18:56<aroscha>uff... 200 eth0=mcast connections is way to much
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---Logclosed Fri Apr 20 00:00:19 2007