lkml.org 
[lkml]   [2011]   [Jul]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH][Resend v2] Fix infinite loop in search_binary_handler()
Date
Am Montag 04 Juli 2011, 14:10:43 schrieb Tetsuo Handa:
> Richard Weinberger wrote:
> > Am Montag 04 Juli 2011, 13:51:55 schrieb Tetsuo Handa:
> > > Richard Weinberger wrote:
> > > > Running a x86_64 kernel without ia32 emulation and a x86 user land
> > > > triggers this issue.
> > >
> > > Executing /sbin/modprobe for x86_32 on an x86_64 kernel without x86_32
> > > support?
> >
> > Yep.
> >
> > > Anyway, request_module() calls __request_module() but
> > > __request_module() stops at MAX_KMOD_CONCURRENT levels of nesting.
> > > So, I think "infinite loop" cannot happen.
> >
> > Booting a x86_64 UML kernel with x86_32 user land triggers this issue.
> > I always wondered why the UML kernel hangs an consumes 100% CPU.
>
> That's strange... Would you show us printk() output like
>
> printk(KERN_INFO "Calling request_module()\n");
> request_module("binfmt-%04x", *(unsigned short *)(&bprm->buf[2]));
> printk(KERN_INFO "Returned from request_module()\n");
>
> for demonstrating that __request_module() cannot stop at
> MAX_KMOD_CONCURRENT levels of nesting?

There you go!
http://userweb.kernel.org/~rw/boot.log

I did not count all messages, but they are more than 50. :-)

Thanks,
//richard


\
 
 \ /
  Last update: 2011-07-04 14:23    [from the cache]
©2003-2011 Jasper Spaans