Re: [uml-user] Minimal chroot requirements for 2.6.x vs. 2.4.x

[BlaisorBlade <bla...@ya...>]

Alle 22:03, gioved=EC 29 aprile 2004, Erik de Bruijn - LowVoice ha scritto:
> Hi!
>
> I'm running some UML's in a production environment, it normally runs very
> stable. But switching to an entirely 2.6.x kernel configuration (both host
> and guest OS') gave some trouble. The 2.6.x guest kernels get a segfault =
or
> kernel panic nr 7

What does that "nr 7" mean? Post the error message. BUT BEFORE upgrade to=20
2.6.4 (see below)!

>, only when ran in the chroot, and only after a while
> (when stresstesting with bonnie or a forkbomb). There's a difference
> between a chrooted environment for the usermode kernel, and one that has
> access to the entire host filesystems (/proc, /dev and /tmp).

> The chroot seems to work perfectly with a 2.4 kernel, but doesn't with 2.6
> kernel anymore. The .config of a problematic kernel can be sent to anyone
> on request (but I won't add it here now). ave to look for a 2.4 kernel
> config if needed, but I seems they all work allright. The same 2.6.3
> .config, and exactly the same binaries work stable without the extra
> chroot.

No, well, the problem is not the chroot. Even if you have not still=20
experienced it, any 2.6 UML patch has a big bug (kernel panic) that shows=20
exactly under fork-bombing. So please upgrade absolutely to 2.6.4 vanilla=20
kernel with 2.6.4-1 UML patch (if you need later kernels you need some more=
=20
fixlets, search the -devel list). If you still have problems, then redo the=
=20
report with the requested data (+ compiler version, distro and so on).

> I found out about the need for /proc/cpuinfo by tracing the calls of a
> running system. What other calls might be made, especially those that
> aren't made every time or directly at startup time?

Well, I think nothing (but strace is better than me; limits its output to t=
he=20
open() syscall and you'll have a lot less junk output to check).

Bye
=2D-=20
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729