Re: [uml-devel] UML Hang / strace fix

["robl" <robl@robl.org.uk>]

I've installed a UML kernel from http://uml.nagafix.co.uk/ and this seems to
have fixed the problem so it looks like a problem with the stock debian
user-mode-linux package kernel.  If anybody is interested in the problem then
let me know what diagnostics you'd like to see and I'll see what I can provide
(it would be nice if the stock debian worked on my system) but otherwise I'm
happy with this solution.

Cheers,

Rob

On Fri, 26 May 2006 23:30:12 +0100, robl wrote
> Hi,
> 
> I posted this on #UML and was asked to repeat it here ...
> 
> I've recently installed UML on a Compaq DL360 G1 Dual P3 1Ghz / 
> Debian Sarge
> 
> I see intermittent hangs with the UML kernel at :
> 
> Initialized stdio console driver
> Console initialized on /dev/tty0
> Initializing software serial port version 1
>  ubda: unknown partition table
> kjournald starting.  Commit interval 5 seconds
> EXT3-fs: mounted filesystem with ordered data mode.
> VFS: Mounted root (ext3 filesystem) readonly.  <----- Hangs here
> 
> The processlist at this point is :
> 
> root     14553  1.1  1.9 206200 10056 pts/0  S+   00:33   0:00       
>    linux mem=200M eth0=tuntap,tap1 root     14558  0.0  1.9 206200 
> 10056 pts/0  S+   00:33   0:00             linux mem=200M 
> eth0=tuntap,tap1 root     14559  0.0  1.9 206200 10056 pts/0  S+   
> 00:33   0:00             linux mem=200M eth0=tuntap,tap1 root    
>  14560  0.0  1.9 206200 10056 pts/0  S+   00:33   0:00             
> linux mem=200M eth0=tuntap,tap1
> 
> If I strace -p 14560 then I see :
> 
> debian:~# strace -p 14560
> Process 14560 attached - interrupt to quit
> poll([{fd=15, events=POLLIN, revents=POLLIN}], 1, -1) = 1
> read(15, "\0", 1)                       = 1
> write(15, "\0", 1)                      = 1
> poll(
> 
> This then causes the UML kernel to continue booting normally.
> 
> It seems a 50/50 success/hang rate.
> 
> The UML kernel is Linux (none) 2.6.16 #2 Sat Apr 29 23:36:42 CEST 
> 2006 i686 GNU/Linux
> 
> I've tried this with a stock Debian sarge 2.4 and a patched 2.6 skas 
> as the host kernels both with the same results.
> 
> Anybody have any ideas why this hangs and why strace kicks it back 
> into action ?
> 
> Thanks,
> 
> Rob
> 
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