On Monday 23 October 2006 10:05, Jacques Landru wrote:
> Blaisorblade wrote:
> > That wonderful VNUML project!
>
> Yes, a neat project, thanks Fermin Galan Marquez of the Technical
> University of Madrid
>
> > if CONFIG_HOST_* is less than CONFIG_VM_SPLIT it should not show "killed"
> > - please try (as a last chance) setting HOST_* to 1G/3G and VM_SPLIT of
> > xenU to 3G/1G.
> > If that boots, I'll know the direction to follow.
>
> OK I will build again my kernels, and report the result.
>
> > This is the real error. The output of cat /proc/$$/maps on xenU would
> > help.
>
> See below (CONFIG_VMSPLIT_1G on xenU, CONFIG_HOST_VMSPLIT_1G on uml kernel)
>
> >> Kernel panic - not syncing: start_userspace : expected SIGSTOP, got
> >> status = 256
> >
> > This is caused by that (the diagnostics requires some decoding but it's
> > the followup of errors like the above one).
>
> ========== output of cat /proc/$$/maps on xenU machine  ==============
> 08048000-080e0000 r-xp 00000000 07:00 3487       /mnt/livecd/bin/bash
> 080e0000-080e5000 rw-p 00098000 07:00 3487       /mnt/livecd/bin/bash
> 080e5000-0810b000 rw-p 080e5000 00:00 0          [heap]
> 37d8d000-37dce000 rw-p 37d8d000 00:00 0
> 37dce000-37dd6000 r-xp 00000000 07:00 10572
> /mnt/livecd/lib/libnss_files-2.4.so
> 37dd6000-37dd8000 rw-p 00007000 07:00 10572
> /mnt/livecd/lib/libnss_files-2.4.so
> 37dd8000-37de0000 r-xp 00000000 07:00 9572
> /mnt/livecd/lib/libnss_nis-2.4.so
> 37de0000-37de2000 rw-p 00007000 07:00 9572
> /mnt/livecd/lib/libnss_nis-2.4.so
> 37de2000-37df3000 r-xp 00000000 07:00 10515
> /mnt/livecd/lib/libnsl-2.4.so
> 37df3000-37df5000 rw-p 00010000 07:00 10515
> /mnt/livecd/lib/libnsl-2.4.so
> 37df5000-37df7000 rw-p 37df5000 00:00 0
> 37df7000-37dfd000 r-xp 00000000 07:00 9502
> /mnt/livecd/lib/libnss_compat-2.4.so
> 37dfd000-37dff000 rw-p 00005000 07:00 9502
> /mnt/livecd/lib/libnss_compat-2.4.so
> 37dff000-37e00000 rw-p 37dff000 00:00 0
> 37e00000-37f17000 r-xp 00000000 07:00 10567     
> /mnt/livecd/lib/libc-2.4.so 37f17000-37f19000 r--p 00116000 07:00 10567    
>  /mnt/livecd/lib/libc-2.4.so 37f19000-37f1b000 rw-p 00118000 07:00 10567   
>   /mnt/livecd/lib/libc-2.4.so 37f1b000-37f1e000 rw-p 37f1b000 00:00 0
> 37f1e000-37f20000 r-xp 00000000 07:00 9498
> /mnt/livecd/lib/libdl-2.4.so
> 37f20000-37f22000 rw-p 00001000 07:00 9498
> /mnt/livecd/lib/libdl-2.4.so
> 37f22000-37f5a000 r-xp 00000000 07:00 10558
> /mnt/livecd/lib/libncurses.so.5.5
> 37f5a000-37f62000 rw-p 00038000 07:00 10558
> /mnt/livecd/lib/libncurses.so.5.5
> 37f62000-37f63000 rw-p 37f62000 00:00 0
> 37f6d000-37f6f000 rw-p 37f6d000 00:00 0
> 37f6f000-37f89000 r-xp 00000000 07:00 10517      /mnt/livecd/lib/ld-2.4.so
> 37f89000-37f8a000 r--p 00019000 07:00 10517      /mnt/livecd/lib/ld-2.4.so
> 37f8a000-37f8b000 rw-p 0001a000 07:00 10517      /mnt/livecd/lib/ld-2.4.so
> 3fd70000-3fd86000 rw-p 3fd70000 00:00 0          [stack]
> 3fffe000-3ffff000 r-xp 3fffe000 00:00 0

Ok, if I recall correctly (but I can't get anything to agree on this, I'm 
testing on an x86_64 box however sadly) this last mapping is in an earlier 
position (by one page) than it is usually, and UML uses up to the last page; 
having matching settings for HOST_VMSPLIT and VMSPLIT makes UML use the space 
it thinks to have assigned, however it is actually getting one page less 
(this is correct, UML should and will autodetect this) and so it gets an 
off-by-one-page error.
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade
http://www.user-mode-linux.org/~blaisorblade
Chiacchiera con i tuoi amici in tempo reale! 
 http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com 


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