Public bug reported:

Binary package hint: linux-image-2.6.22-14-rt

I have a Terratec Phase 26 USB soundcard, which worked fine under feisty
and edgy. WIth the updated to Gutsy I experience a crash whenever an
application tries to play sound with this soundcard.

One example:
1. I open gnome-sound-properties
2. select USB-Audio
3. click on test

Result: immediate Segmentation fault

I could reproduce this using the same sound card on a friend's notebook
(an IBM modell, I have got a Samsung X-10). Tested it with this kernel
2.6.22-14-rt #1 SMP PREEMPT RT Mon Oct 15 01:05:51 GMT 2007 i686
GNU/Linux, as well als the non -rt one.

I am not fully sure if this is related, but dmesg outputs this:
..
[ 7390.506532] BUG: unable to handle kernel paging request at virtual address 
99396086
[ 7390.506542]  printing eip:
[ 7390.506545] f88b669c
[ 7390.506547] *pde = 00000000
[ 7390.506552] Oops: 0000 [#1]
[ 7390.506554] PREEMPT SMP 
[ 7390.506559] Modules linked in: af_packet binfmt_misc ppdev ipv6 
speedstep_centrino cpufreq_userspace cpufreq_stats cpufreq_powe
rsave cpufreq_ondemand freq_table cpufreq_conservative video sbs container 
button dock battery ac ext3 jbd mbcache sha256 cbc blkc
ipher aes_i586 dm_crypt dm_mod sbp2 parport_pc lp parport snd_intel8x0 
snd_ac97_codec ac97_bus pcmcia snd_seq_dummy snd_usb_audio 
snd_pcm_oss snd_seq_oss snd_mixer_oss nvidia(P) snd_pcm agpgart snd_usb_lib 
ipw2100 yenta_socket snd_seq_midi i2c_core ieee80211 r
src_nonstatic joydev ieee80211_crypt pcmcia_core snd_rawmidi videodev 
snd_seq_midi_event v4l2_common v4l1_compat snd_hwdep snd_seq
 snd_timer snd_seq_device iTCO_wdt snd serio_raw iTCO_vendor_support shpchp 
pci_hotplug soundcore snd_page_alloc psmouse evdev xfs
 usbhid hid sg sr_mod cdrom sd_mod ata_piix ata_generic ohci1394 ehci_hcd 3c59x 
uhci_hcd libata ieee1394 mii usbcore scsi_mod ther
mal processor fan fuse apparmor commoncap
[ 7390.506653] CPU:    0
[ 7390.506654] EIP:    0060:[<f88b669c>]    Tainted: P       VLI
[ 7390.506657] EFLAGS: 00010282   (2.6.22-14-rt #1)
[ 7390.506692] EIP is at hcd_buffer_free+0x1c/0xa0 [usbcore]
[ 7390.506696] eax: 99396086   ebx: 00000040   ecx: 1f805180   edx: 00000040
[ 7390.506701] esi: df805180   edi: 99396086   ebp: f6c7f2c0   esp: f56fdea4
[ 7390.506705] ds: 007b   es: 007b   fs: 00d8  gs: 0033  ss: 0068  
preempt:00000001
[ 7390.506711] Process mixer_applet2 (pid: 6065, ti=f56fc000 task=f58341b0 
task.ti=f56fc000)
[ 7390.506714] Stack: 1f805180 f716ea00 00000000 f8acecfc 1f805180 f6c7f300 
f6c7f30c f8aced98 
[ 7390.506724]        f70b34ac f70b3400 00001fff f6c7b800 f8a96548 f6c7cb40 
f6c7b940 f89c7b05 
[ 7390.506734]        00000001 00001000 f89c7b9f f6c7b800 f5753480 f6c7b800 
f6c7b9bc f89c36f0 
[ 7390.506744] Call Trace:
[ 7390.506769]  [<f8acecfc>] snd_usbmidi_out_endpoint_delete+0x2c/0x50 
[snd_usb_lib]
[ 7390.506791]  [<f8aced98>] snd_usbmidi_free+0x28/0x60 [snd_usb_lib]
[ 7390.506814]  [<f8a96548>] snd_rawmidi_free+0x68/0x80 [snd_rawmidi]
[ 7390.506832]  [<f89c7b05>] snd_device_free+0x65/0xb0 [snd]
[ 7390.506862]  [<f89c7b9f>] snd_device_free_all+0x4f/0x60 [snd]
[ 7390.506891]  [<f89c36f0>] snd_card_do_free+0x30/0x100 [snd]
[ 7390.506913]  [<f89c38ad>] snd_card_file_remove+0xed/0x120 [snd]
[ 7390.506945]  [<f89c75ff>] snd_ctl_release+0xef/0x100 [snd]
[ 7390.506978]  [<f89c3e51>] snd_disconnect_release+0x71/0xa0 [snd]
[ 7390.507010]  [<c01862a4>] __fput+0x94/0x180
[ 7390.507036]  [<c0183337>] filp_close+0x47/0x80
[ 7390.507053]  [<c0184789>] sys_close+0x69/0xc0
[ 7390.507068]  [<c0104362>] sysenter_past_esp+0x6b/0xa9
[ 7390.507114]  =======================
[ 7390.507116] Code: bb 5c a4 c7 eb c8 90 90 90 90 90 90 90 90 90 83 ec 0c 89 
74 24 04 89 ce 8b 4c 24 10 85 f6 89 1c 24 89 d3 89 7c 24 08 89 c7 74 5e <8b> 00 
31 d2 8b 80 c4 01 00 00 85 c0 74 5f 8d b6 00 00 00 00 3b 
[ 7390.507161] EIP: [<f88b669c>] hcd_buffer_free+0x1c/0xa0 [usbcore] SS:ESP 
0068:f56fdea4
..

** Affects: linux-source-2.6.22 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
alsa applications crash on playing with sound-usb (terratec phase 26)
https://bugs.launchpad.net/bugs/157198
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