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

Muhammad Shahzad shaheryarkh at googlemail.com
Sun Jul 26 05:19:43 PDT 2009


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
 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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