Re: [uml-devel] Kernel idles in loop after loading IPv4

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

Alle 22:23, venerdì 30 gennaio 2004, Phil Nadeau ha scritto:
> On Tue, 2004-01-27 at 20:39, Jeff Dike wrote:

> Here's the last part of a debug session that I ran which produced the
> error. The full transcript is attached. Thanks in advance.

Could you try to reproduce this bug running onto a 2.4 host-skas kernel with 
the same guest kernel? Most people have no problem with the code; also, the 
host-skas patch for 2.6 that you used has more than one bug (somebody even 
reported kernel Oopses with that applied). Also, I'd like more info on the 
host configuration: glibc/gcc version and distro used.

> NET: Registered protocol family 2
>
> Breakpoint 1, schedule () at kernel/sched.c:1489
> 1489            if (likely(!(current->state & (TASK_DEAD | TASK_ZOMBIE))))
> { #0  schedule () at kernel/sched.c:1489
> #1  0xa002db4e in wait_for_completion (x=0xa1fefb64) at kernel/sched.c:1758
> #2  0xa0041104 in synchronize_kernel () at kernel/rcupdate.c:262
> #3  0xa000b5dc in inet_init () at net/ipv4/af_inet.c:1144

An old message, "[uml-devel] wait queues broken?" on 19 November 2003, spoke 
of something that could be related to this. Since everything is about 
scheduling, this error message I got could be of interest:

Kernel panic: Kernel mode fault at addr 0x1f, ip 0x400d1397
Kernel panic: kernel BUG at kernel/exit.c:793!

The second message is of interest because the BUG line of interest reads as:
  schedule();
  BUG();
and this is fairly interesting.

To get this, I've run this command:

while /bin/true ; do /bin/true ; done

However, the kernel I was running went on after the "NET: Registered protocol 
family 2" message.
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729




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