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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