[Freeswitch-users] A possible bug in FS causing Linux Kernel crash

[Muhammad Shahzad]

Thanks. Let me try it and let you know the results.

Thank you.


On Sun, Jul 26, 2009 at 5:40 PM, Giovanni Maruzzelli <gmaruzz at celliax.org>wrote:

> Performance problems and other issues (eg crashes on ALSA drivers) has
> been reported for Skypiax on CentOS, albeit various users got good
> success on same CentOS. The section down below, "Extreme" Performances
> on Linux solves all problems for the user that got issues on CentOS.
>
>
> http://wiki.freeswitch.org/wiki/Skypiax_Skype_Endpoint_and_Trunk#.22Extreme.22_Performances_on_Linux
>
>
>
> On Sun, Jul 26, 2009 at 2:37 PM, Giovanni Maruzzelli<gmaruzz at celliax.org>
> wrote:
> > Ciao Muhammad,
> >
> > I've got many problems with ALSA drivers, including various kind of
> crashes.
> >
> > To make a looong story short, use the alsa_drivers version 1.0.20,
> > they have not yet crashed on me.
> >
> > Also, if you want to test it, you can compile the customized snd-dummy
> > driver you find in the svn code, it is a try to have much more
> > efficiency bot in softirqs and context switches, allows for 64 Skype
> > instances (128 subdevices), etc. it is to be compiled with
> > alsa_drivers 1.0.20 too.
> >
> > Is my feeling (I mean, almost sure) they got spin_locking wrong in
> > previous versions, and it crashes the kernel when you "really" use it
> > (Skype clients have a demented usage of alsa).
> >
> > BTW, I'm in the process of revamp the code, fix the bugs and apply
> > patches. Please, have a look at the new wiki page with lots of new
> > content, I'll send a mail to the ML tomorrow :-)
> >
> >
> > Sincerely,
> >
> > Giovanni Maruzzelli
> > =========================================
> > www.celliax.org
> > via Pierlombardo 9, 20135 Milano
> > Italy
> > gmaruzz at celliax dot org
> > Cell : +39-347-2665618
> > Fax : +39-02-87390039
> >
> >
> >
> >
> > On Sun, Jul 26, 2009 at 2:19 PM, Muhammad
> > Shahzad<shaheryarkh at googlemail.com> wrote:
> >> Hi,
> >>
> >> I am having random Linux Kernel crash problems while running FreeSWITCH
> as
> >> Skype to/from SIP gateway on one of our production servers. This machine
> is
> >> running CentOS 5.2, Kernel version 2.6.18-92.1.22.el5.centos.plusPAE
> with FS
> >> svn revision number 13754.
> >>
> >> At time of Kernel crash i could find following crash messages which
> point to
> >> some source code file in FS source tree.
> >>
> >>  --------------------- Kernel Begin ------------------------
> >>
> >>
> >>  3 Time(s):  =======================
> >>  3 Time(s):  [<c0404eff>] syscall_call+0x7/0xb
> >>  3 Time(s):  [<c043ed22>] sys_delete_module+0x192/0x1b8
> >>  3 Time(s):  [<c0449011>] audit_syscall_entry+0x14b/0x17d
> >>  3 Time(s):  [<c049f4fe>] remove_proc_entry+0x139/0x18c
> >>  3 Time(s):  [<f8d96281>] alsa_sound_exit+0xa/0x30 [snd]
> >>  3 Time(s):  [<f8d96304>] snd_info_done+0x46/0x49 [snd]
> >>  3 Time(s): BUG: warning at fs/proc/generic.c:732/remove_proc_entry()
> (Not
> >> tainted)
> >>  1 Time(s): snd-malloc: Memory leak?  pages not freed = 1
> >>
> >>  ---------------------- Kernel End -------------------------
> >>
> >> While the problem seems to arise from ALSA kernel module but it blames
> FS
> >> file fs/proc/generic.c:732 for this. The only FS module that is using
> ALSA
> >> is mod_skypiax but as far as i remember that module is using FS internal
> >> routines to allocate and de-allocate sound driver services for Skype
> client.
> >>
> >> Please suggest a solution.
> >>
> >> Thank you.
> >>
> >>
> >> --
> >> Muhammad Shahzad
> >> -----------------------------------
> >> CISCO Rich Media Communication Specialist (CRMCS)
> >> CISCO Certified Network Associate (CCNA)
> >> Cell: +92 334 422 40 88
> >> MSN: shari_786pk at hotmail.com
> >> Email: shaheryarkh at googlemail.com
> >>
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> >>
> >>
> >
>
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-- 
Muhammad Shahzad
-----------------------------------
CISCO Rich Media Communication Specialist (CRMCS)
CISCO Certified Network Associate (CCNA)
Cell: +92 334 422 40 88
MSN: shari_786pk at hotmail.com
Email: shaheryarkh at googlemail.com
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