[LAU] Strange problems with Audacity

Sebastian Tschöpel tschoseb at tu-cottbus.de
Sat Dec 15 04:37:17 EST 2007

Hello Lee,

thanks for your advise.

 > Does kill -9 work?  If not, please run "dmesg" and check for a kernel 
 > Lee

Well, kill -9 doesn't work either. If I use dmesg I get the following 

BUG: unable to handle kernel NULL pointer dereference at virtual address 
  printing eip:
*pde = 00000000
stopped custom tracer.
Oops: 0000 [#1]
Modules linked in: snd_seq_dummy radeon drm xt_pkttype ipt_LOG xt_limit 
af_packet snd_pcm_oss snd_mixer_oss snd_seq_midi snd_seq_midi_event 
snd_seq thermal processor button battery ac ip6t_REJECT xt_tcpudp 
ipt_REJECT xt_state iptable_mangle iptable_nat ip_nat iptable_filter 
ip6table_mangle ip_conntrack nfnetlink ip_tables ip6table_filter 
ip6_tables x_tables ipv6 nls_utf8 ntfs nls_iso8859_1 nls_cp437 vfat fat 
loop dm_mod snd_usb_audio snd_usb_lib snd_hwdep usbhid ff_memless ide_cd 
snd_ice1712 snd_ice17xx_ak4xxx snd_ak4xxx_adda snd_cs8427 snd_ac97_codec 
cdrom ns558 snd_pcm snd_timer snd_page_alloc snd_ac97_bus snd_i2c 
snd_mpu401 snd_mpu401_uart snd_rawmidi snd_seq_device sk98lin gameport 
snd soundcore shpchp pci_hotplug forcedeth ehci_hcd ohci_hcd ohci1394 
ieee1394 nvidia_agp agpgart i2c_nforce2 usbcore i2c_core parport_pc lp 
parport ext3 mbcache jbd edd fan sata_sil libata amd74xx sd_mod scsi_mod 
ide_disk ide_core
CPU:    0
EIP:    0060:[<f97cf077>]    Not tainted VLI
EFLAGS: 00010246   (2.6.19-5-rt #1)
EIP is at snd_ice1712_capture_open+0x26/0x45 [snd_ice1712]
eax: 00000000   ebx: f58e9000   ecx: 0000000b   edx: ffffffff
esi: f42a5c00   edi: 00000001   ebp: e80a6280   esp: f5577e78
ds: 007b   es: 007b   ss: 0068   preempt: 00000001
Process audacity (pid: 4192, ti=f5576000 task=f5f74e90 task.ti=f5576000)
Stack: 00000000 f5577eb4 f9775fc1 f5577e88 f5942c00 fffffff2 f6f1f200 
        f5577eb4 00000001 00000000 f5f74e90 c011dd0d f6f1f364 f6f1f364 
        f5a01ca0 f9705620 00000000 e80a6280 f96f9394 c013d9d1 f5a05598 
Call Trace:
  [<f9775fc1>] snd_pcm_open_substream+0x3c/0x76 [snd_pcm]
  [<f97760e3>] snd_pcm_open+0xe8/0x226 [snd_pcm]
  [<c011dd0d>] default_wake_function+0x0/0x16
  [<f96f9394>] snd_open+0x107/0x203 [snd]
  [<c013d9d1>] rt_down+0xe/0x26
  [<c0172589>] chrdev_open+0x12d/0x161
  [<c017245c>] chrdev_open+0x0/0x161
  [<c016e9f3>] __dentry_open+0xea/0x1ea
  [<c016eb6d>] nameidata_to_filp+0x24/0x33
  [<c016ebb3>] do_filp_open+0x37/0x3e
  [<c017a3e6>] fasync_helper+0xb6/0xbf
  [<c016e8ff>] get_unused_fd+0xb9/0xc3
  [<c016ec00>] do_sys_open+0x46/0xc8
  [<c016ecbb>] sys_open+0x1c/0x1e
  [<c0103f5d>] sysenter_past_esp+0x56/0x79
Code: a0 c6 31 c0 c3 56 b9 38 00 00 00 53 8b 70 70 ba c0 4c 7d f9 8b 58 
08 89 43 54 8d 86 ec 00 00 00 e8 ef 2d a0 c6 8b 83 a0 00 00 00 <8b> 80 
80 00 00 00 a8 02 89 86 f8 00 00 00 75 0a c7 86 fc 00 00
EIP: [<f97cf077>] snd_ice1712_capture_open+0x26/0x45 [snd_ice1712] 
SS:ESP 0068:f5577e78

... unfortunately I have nearly no idea what this is telling me. Are there
some information about a possible reason to find in this output?

I would assume that the answer is in the first line: a null pointer 
dereference in the kernel.
Well, seems like i have to ask the JAD guys, right?

Best regards,

web: http://linuxaudioblog.sternenhejim.de

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