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

[Giovanni Maruzzelli]

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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>>
>