Re: [uml-devel] init_new_context_skas - new_mm failed, errno = -24

[Blaisorblade <blaisorblade@yahoo.it>]

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On martedì 11 settembre 2007, Christopher S. Aker wrote:
> Jeff Dike wrote:
> > On Thu, Sep 06, 2007 at 11:03:52AM -0400, Christopher S. Aker wrote:
> >> 2.6.22.6-um
> >>
> >> init_new_context_skas - new_mm failed, errno = -24
> >> init_new_context_skas - new_mm failed, errno = -24
> >> init_new_context_skas - new_mm failed, errno = -24
> >> Kernel panic - not syncing: switch_mm_skas - PTRACE_SWITCH_MM failed,
> >> errno = 9
> >>
> >> Is this cause by a still-too-low max_map_count value?
> >
> > Could be - what was the host's max_map_count?
> >
> > 				Jeff

errno = 24 means EMFILE (too many open files).

And I read, in mm/mmap.c: do_mmap_pgoff():

        /* Too many mappings? */
        if (mm->map_count > sysctl_max_map_count)
                return -ENOMEM;

While open_proc_mm only returns 0 or -ENOMEM.

So I'm 99% sure that you have indeed too many open files. There is a 
differnence between EMFILE and ENFILE - I vaguely remember that the 2nd is 
about ulimit while the first is about the total number of fd's. (man proc 
should says how to increase it - it is under /proc/sys).

> root@atlanta20:~# cat /proc/sys/vm/max_map_count
> 500000
> root@atlanta20:~# free -g
>               total       used       free     shared    buffers     cached
> Mem:            23          8         15          0          0          7
> -/+ buffers/cache:          0         23
> Swap:            1          0          1

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-- 
"Doh!" (cit.), I've made another mistake!
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade

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