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#uml IRC Logs for 2007-11-15

---Logopened Thu Nov 15 00:00:08 2007
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05:31<jjkola-#uml->>hello
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09:20<Magotari-#uml->>remus: Not a cat, just some cable breakage. Or maybe: psmouse.c: Explorer Mouse at isa0060/serio1/input0 lost synchronization, throwing 3 bytes away.
09:20<Magotari-#uml->>Lots of that in my dmesg.
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10:39<jdike-#uml->>Hi guys
10:41<jjkola-#uml->>hi jdike
10:43<Magotari-#uml->>Hey, jdike. I have been looking at kconfig again, and I came to an interesting conclusion. A lot of things which should not be a part of uml (real hardware) are already marked as !S390.
10:43<jdike-#uml->>interesting
10:44<Magotari-#uml->>Yes, it is. I started writing the email to the S390 maintainer, but then decited against it.
10:45<jdike-#uml->>what sort of things are marked !S390?
10:45<jdike-#uml->>individual drivers?
10:46<Magotari-#uml->>Not only that. Also whole subsystems like wireless, bluetooth, irda...
10:46<Magotari-#uml->>But the drivers alone as well.
10:47<Magotari-#uml->>Actually, in case of "wireless" I meant the wireless stacks.
10:54<Magotari-#uml->>I wonder what a virtual machine and a mainframe have in common that could be exploited to give it just one ! kconfig option...
10:58<jdike-#uml->>I would look at what these things really depend on
10:58<jdike-#uml->>especially the drivers
10:58<jdike-#uml->>generally, they should depend on a bus
10:59<jdike-#uml->>S390 is a virtual machine, BTW
11:00<jdike-#uml->>jjkola, how quickly can you make UML hang?
11:01<jdike-#uml->>see if http://rafb.net/p/MzTvmx95.txt helps
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11:10<jjkola-#uml->>it may take some time, typically it happens when I'm not using network for longer periods, namely in early mornings
11:11<jjkola-#uml->>I'll apply that patch and see if it helps
11:19<jjkola-#uml->>had to apply that patch manually to 2.6.23
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11:24<jjkola-#uml->>here it is: http://rafb.net/p/rxgLyV31.html
11:25<jjkola-#uml->>by the way, there is also SIGALARM in there which wasn't in your patch
11:25<jjkola-#uml->>does it make any difference?
11:26<jjkola-#uml->>*SIGALRM
11:27<jdike-#uml->>the patch I gave you was against rc2-mm1
11:27<jdike-#uml->>but I thought all the timekeeping changes were in 2.6.23
11:27<jdike-#uml->>it shouldn't matter
11:28<jjkola-#uml->>ok, good to know
11:29<jdike-#uml->>the important thing is to get SIGSEGV off the IRQ stack
11:30<jjkola-#uml->>so those SIGSEGVs were overflowing the IRQ stack?
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11:33<jdike-#uml->>no, more subtle than that
11:33<jjkola-#uml->>oh?
11:33<jdike-#uml->>there is some setup and teardown that has to happen when entering and exiting the IRQ stack
11:34<jdike-#uml->>the page fault handler can longjmp out of the signal handler, totally avoiding the teardown that needs to happen
11:36<jjkola-#uml->>so, most of the SIGSEGVs were left on IRQ stack?
11:38<jdike-#uml->>no
11:38<jdike-#uml->>the setup and teardown involves making current->stack point at the IRQ stack on entry and point back the original stack on exit
11:39<jdike-#uml->>when it longjmps out of the handler, current->stack (and current_thread_info) continue to point at the IRQ stack
11:43<jjkola-#uml->>ah, now I understand
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12:23<jjkola-#uml->>ok, I have now the patched umls running without any interface resets
12:24<jjkola-#uml->>so if they are still running tomorrow I think we can quite safely assume that the patch worked
12:25<jdike-#uml->>OK
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13:11<waldner-#uml->>has anyone seen this: BUG: failure at mm/mmap.c:2043/exit_mmap()!
13:12<waldner-#uml->>Kernel panic - not syncing: BUG!
13:12<waldner-#uml->>running a 2.6.24-rc2, x86
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13:20<jdike-#uml->>yeah
13:21<jdike-#uml->>and I'm fixing it
13:21<waldner-#uml->>jdike: must be I'm the one that finds all the not-yet-fixed bugs lol
13:22<waldner-#uml->>just kidding of course, thanks gor your work
13:22<waldner-#uml->>have you already got a patch to apply?
13:23<jdike-#uml->>not yet
13:23<jdike-#uml->>did you fiddle the config to make this happen?
13:24<waldner-#uml->>I did do make menuconfig, but I did not enable any arcane option
13:24<waldner-#uml->>at least AFAIK
13:24<waldner-#uml->>I can paste the config if you want
13:25<jdike-#uml->>Because I have to turn on three-level page tables in order to get it to happen
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13:26<waldner-#uml->>I'm checking whether it's enabled
13:29<waldner-#uml->>uhm, it's enabled
13:29<jdike-#uml->>disable it
13:29<waldner-#uml->>I must have enabled it by mistake
13:29<jdike-#uml->>it's not doing you any good
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13:36<waldner-#uml->>yes, it works now
13:36|-|jjkola changed nick to jjkola|afk
13:36<waldner-#uml->>thanks and sorry for the noise
13:37<waldner-#uml->>but I didn't know that I had enabled (and even if I did, I wouldn't know it could be tha cause)
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13:58<jdike-#uml->>that's why I'm fixing it
13:59<jdike-#uml->>among other reasons
14:11<jdike-#uml->>The thing finally builds and boots
14:11<jdike-#uml->>The last step being a round of mortal combat with gcc
14:12|-|jjkola|afk changed nick to jjkola
14:13<jdike-#uml->>It exploded into a 32 file, 1000 line patch
14:13<jdike-#uml->>now to break it up
14:19<jjkola-#uml->>a nice little patch :p
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15:33<waldner-#uml->>well, what to say? thanks
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17:11<kingsley-#uml->>Is it possible to switch to a virtual terminal that's not currently running X, run UML from its command line, and let UML launch its own X in that virtual terminal?
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17:14<jdike-#uml->>no
17:14<jdike-#uml->>you need to be running X on the host
17:14<jdike-#uml->>and UML has no access to the host
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17:27<Magotari-#uml->>Well...
17:28<Magotari-#uml->>But you can get pretty close.
17:28<Magotari-#uml->>You need Xnest, in fullscreen mode.
17:28<Magotari-#uml->>With the ratpoison window manager you can even have multiple of those, switchable with the keyboard.
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19:04<jjkola-#uml->>waldner: network problems?
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19:11<remus-#uml->>Magotari: oh ... I just thought your cat started eating the mouse ;-)
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---Logclosed Fri Nov 16 00:00:42 2007