TheGrebs.com:IRC Logs:#uml:2006:06:15

---	Log	opened Thu Jun 15 00:00:23 2006
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11:06	<jdike>	Hi guys
11:28	<notsu>	hi
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13:48	<kokoko1>	Hello
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15:55	[~]	tanuki is having issues with the tuntap driver and UML hanging
15:55	<tanuki>	the instance isn't hung (it responds to uml_mconsole version)
15:55	<jdike>	details?
15:56	<tanuki>	but it gets to "Configuring network interfaces..." and stops. argument is eth0=tuntap,,,192.168.1.254
15:56	<tanuki>	the root image is Debian Sarge
15:57	<jdike>	UML version?
15:57	<tanuki>	OK Linux siguest 2.6.16.20 #2 Thu Jun 8 17:47:39 EDT 2006 i686
15:57	<jdike>	anything in dmesg?
15:59	<tanuki>	jdike: checking
16:02	<tanuki>	nothing about eth0 at all (it doesn't even show up in the "kernel command line" line)
16:03	<tanuki>	but the weird part is this: when I include eth0 on the command line, the console moves from con0 to con1
16:03	<jdike>	paste dmesg to pastebin or something
16:03	<tanuki>	Jun 15 20:59:45 siguest kernel: Kernel command line: ubd0=/home/sys/osc/fs/debian.1gb.rfs con=null con0=fd:0,fd:1 root=98:0
16:03	<tanuki>	that's from this boot
16:04	<tanuki>	/var/log/dmesg only contains data from this boot (without eth0)
16:06	<jdike>	then plug eth0 in with mconsole
16:09	<tanuki>	plugging it in worked, "ifup eth0" caused a hang, and now reboot and halt in mconsole hang
16:09	<jdike>	can you gdb it?
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16:12	<tanuki>	the mconsole or the UML?
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16:15	<tanuki>	got the UML instance open in gdb... want a backtrace?
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16:17	<tanuki>	http://pastebin.com/711627 is the first screenful of the backtrace
16:17	<tanuki>	I think that means that it can't find uml_net (though I have no idea why)
16:18	<tanuki>	Can execvp() exec a symlink?
16:19	<tanuki>	/usr/bin/uml_net is a symlink to /usr/lib/uml/uml_net which is -rwsr-x--- root uml-net
16:19	<tanuki>	(my user is in the uml-net group)
16:19	[~]	tanuki facepalms
16:19	<tanuki>	I bet dollars to donuts I forgot to log out and back in
16:20	<tanuki>	... and that's what it was.
16:20	<tanuki>	I apologize for wasting everyone's time.
16:22	<jdike>	it shouldn't hang though
16:22	<jdike>	I didn't want a backtrace
16:22	<jdike>	can you 'printf "%s", log_buf' to gdb?
16:24	<jdike>	actually, I did want that backtrace :-)
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16:27	<cndougla>	I'm having some troubles compiling an external kernel module into uml
16:27	<jdike>	strange, that shouldn't have hung there
16:27	<cndougla>	I figured out that I had to add an extra path for include files, but it seems to only use the extra path for compiling
16:28	<cndougla>	so when it went to link the module, it failed
16:28	<cndougla>	does anyone have any ideas of what might be wrong?
16:28	<jdike>	how exactly did it fail to link?
16:29	<cndougla>	it says it can't find sysdep/faultinfo.h
16:29	<cndougla>	which is what it did when compiling until I added arch/um/include to the EXTRA_CFLAGS
16:29	<jdike>	is the UML tree configured?
16:30	<cndougla>	and build
16:30	<cndougla>	configured and built
16:30	<jdike>	what was your build command?
16:30	<jdike>	for the module?
16:31	<cndougla>	well, it's a module I've created in kdevelop
16:31	<cndougla>	so just make
16:31	<jdike>	and I don't think you should have had to add anything to CFLAGS
16:31	<cndougla>	it compiles and links fine against my host kernel
16:31	<cndougla>	hmm, cause it gave me the same problem about not finding header files
16:32	<jdike>	it should be a make -f .../linux/Makefile or something
16:32	<jdike>	it can't be a straight make
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16:33	<cndougla>	well, the way kdevelop set it up, I just have to type make and it runs
16:36	<jdike>	that makes it hard to figure out if I messed up external modules somehow
16:37	<jdike>	can you paste the Makefile someplace?
16:37	<cndougla>	I'm assuming that I should be able to mount the root_fs and point the KDIR and DEST variables to the appropriate place
16:37	<cndougla>	do I have to build it while inside the UML?
16:38	<jdike>	you can loop-mount the fs
16:38	<cndougla>	that's what I did
16:40	<cndougla>	I pasted it to: http://pastebin.com/711663
16:40	<cndougla>	I added the three lines at the top, commented out the next 2 and added $(INC) to the EXTRA_CFLAGS
16:41	<cndougla>	but nothing else
16:41	<jdike>	make -C $(KDIR) SUBDIRS=$(PWD) modules
16:41	<jdike>	that's what I was talking about
16:41	<cndougla>	oh
16:41	<cndougla>	ok
16:41	<cndougla>	so do you know what is wrong with it?
16:42	<jdike>	roughly
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16:43	<jdike>	roughly == the make line is roughly right
16:43	<cndougla>	oh
16:43	<cndougla>	ok
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16:44	<cndougla>	oh, after looking at it again, it actually fails at stage 2 of building the module, not at linking
16:46	<jdike>	I think that Makefile is wrong
16:46	<cndougla>	in what way
16:46	<jdike>	can you cook up another Makefile from http://lwn.net/Articles/21823/ and see if that's any better?
16:46	<cndougla>	yeah
16:46	<cndougla>	thanks
16:47	<cndougla>	do you have any idea where it's wrong, or just to look at everything?
16:47	<jdike>	It tries to do the link itself for one thing
16:47	<jdike>	kbuild should do that
16:47	<cndougla>	ok
16:48	<jdike>	I don't see how it's messing up the compile though
16:48	<jdike>	but it looks like kdevelop is trying to be too smart
16:49	<cndougla>	ok
16:55	<cndougla>	ok, so after looking at that site, basically I should be able to do a simple:
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16:55	<cndougla>	make -C <KDIR> SUBDIRS=<PWD> modules
16:55	<cndougla>	and everything should work
16:55	<cndougla>	but it still gives me the same error
16:55	<cndougla>	when building stage 2
16:56	<jdike>	can't find the same header?
16:56	<cndougla>	yeah
16:56	<jdike>	can you add V=1, and paste the results?
16:56	<cndougla>	like it doesn't know to search in arch/um/include
16:56	<jdike>	ooh
16:56	<cndougla>	add V=1 to the make command?
16:56	<jdike>	you forgot ARCH=um
16:56	<cndougla>	oh...
16:56	<cndougla>	hehe
16:57	<cndougla>	yeah
16:57	<cndougla>	and so the original kdevelop file is probably fine too, just needed to add ARCH=um
16:58	<cndougla>	it all works now
16:58	<cndougla>	in the kdevelop makefile as well
16:59	<cndougla>	thanks a lot
16:59	<cndougla>	btw, is it safe to have the root fs mounted at the same time as you run uml?
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17:00	<jdike>	no
17:04	<cndougla>	alright
17:04	<cndougla>	thanks
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---	Log	closed Fri Jun 16 00:00:04 2006