[alsa-devel] alsa kernel panic

[Victor L]

Hi ,

I have Linux panic when started play music with one of my USB audio device.
first please see this logs:

[   71.684730] usbcore: registered new interface driver snd-usb-audio
[   73.835355] BUG: unable to handle kernel NULL pointer dereference
at 0000000000000008
[   73.835412] IP: [<ffffffffc0b45d3c>]
snd_usb_endpoint_start+0x23c/0x2f0 [snd_usb_audio]
[   73.835414] PGD 0
[   73.835415]
[   73.835418] Oops: 0000 [#1] PREEMPT SMP
[   73.835482] Modules linked in: snd_usb_audio snd_usbmidi_lib
snd_hwdep snd_pcm_oss snd_mixer_oss snd_
pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device
snd_timer snd soundcore coretemp
iwl3945 iwlegacy i915 ehci_pci iTCO_wdt ehci_hcd pcmcia
iTCO_vendor_support kvm usbcore mac80211 e1000e
yenta_socket sr_mod pcmcia_rsrc cfg80211 pcmcia_core lpc_ich mfd_core
drm_kms_helper cdrom rfkill ata_ge
neric irqbypass ptp pps_core joydev sg pcspkr i2c_i801 drm battery
i2c_algo_bit ata_piix i2c_smbus usb_c
ommon shpchp rng_core ac acpi_cpufreq video button nls_utf8 cifs
sha256_ssse3 cmac md4 des_generic arc4
dns_resolver fscache sunrpc loop ip_tables x_tables autofs4 ext4 crc16
jbd2 crc32c_generic fscrypto ecb
glue_helper lrw gf128mul ablk_helper cryptd aes_x86_64 mbcache sd_mod
ahci libahci
[   73.835486]  evdev libata psmouse serio_raw scsi_mod thermal
[   73.835491] CPU: 1 PID: 1099 Comm: output:oops Not tainted 4.9.144-rt93 #1
[   73.835492] Hardware name: LENOVO 636962M/636962M, BIOS 7IET38WW
(1.19 ) 03/22/2011
[   73.835494] task: ffff8beb97502c40 task.stack: ffffac1901068000
[   73.835505] RIP: 0010:[<ffffffffc0b45d3c>]  [<ffffffffc0b45d3c>]
snd_usb_endpoint_start+0x23c/0x2f0 [
snd_usb_audio]
[   73.835507] RSP: 0000:ffffac190106bcc0  EFLAGS: 00010246
[   73.835508] RAX: 00000000ffffffea RBX: ffff8beb96c00000 RCX: 00000000ffffffea
[   73.835509] RDX: 0000000000000000 RSI: ffffffffc0b5bf98 RDI: ffff8beb99a18000
[   73.835511] RBP: 0000000000000002 R08: ffffffffc0b5a8d3 R09: 0000000000000000
[   73.835512] R10: 00000000fffffe00 R11: 0000000000000200 R12: ffff8beb96c80070
[   73.835513] R13: ffff8beb99a18000 R14: 0000000000000002 R15: 0000000000000000
[   73.835516] FS:  00007fdfedc66700(0000) GS:ffff8bebbf300000(0000)
knlGS:0000000000000000
[   73.835518] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   73.835519] CR2: 0000000000000008 CR3: 00000000b4ab6000 CR4: 0000000000000670
[   73.835520] Stack:
[   73.835525]  ffff8bebb8888c18 ffff8beb96c00000 0000000000000000
0000000000008002
[   73.835528]  00007fdfe40197d0 ffffffffc0b4e7cd ffff8bebb8888c18
ffff8beb974b2400
[   73.835531]  ffffffffc0b5088a ffff8beb0000ac44 ffff8bebb206d300
0000000000000000
[   73.835531] Call Trace:
[   73.835545]  [<ffffffffc0b4e7cd>] ? start_endpoints+0x3d/0x150
[snd_usb_audio]
[   73.835555]  [<ffffffffc0b5088a>] ? snd_usb_pcm_prepare+0x2ea/0x520
[snd_usb_audio]
[   73.835577]  [<ffffffffc0b0c176>] ?
snd_pcm_sw_params_user+0x56/0x90 [snd_pcm]
[   73.835584]  [<ffffffffc0b0b2d9>] ? snd_pcm_do_prepare+0x19/0x30 [snd_pcm]
[   73.835591]  [<ffffffffc0b09ea6>] ? snd_pcm_action_single+0x36/0x80 [snd_pcm]
[   73.835598]  [<ffffffffc0b0a311>] ?
snd_pcm_action_nonatomic+0x61/0x70 [snd_pcm]
[   73.835606]  [<ffffffffc0b0e219>] ?
snd_pcm_common_ioctl1+0x3a9/0xc60 [snd_pcm]
[   73.835674]  [<ffffffffc03a73ce>] ? ext4_file_write_iter+0x22e/0x370 [ext4]
[   73.835682]  [<ffffffffc0b0ecaa>] ?
snd_pcm_playback_ioctl1+0x1da/0x240 [snd_pcm]
[   73.835690]  [<ffffffffb9736a38>] ? __seccomp_filter+0x78/0x2a0
[   73.835698]  [<ffffffffc0b0ed33>] ?
snd_pcm_playback_ioctl+0x23/0x30 [snd_pcm]
[   73.835702]  [<ffffffffb982c9c4>] ? do_vfs_ioctl+0xa4/0x620
[   73.835706]  [<ffffffffb96033b4>] ? syscall_trace_enter+0x144/0x300
[   73.835709]  [<ffffffffb982cfb4>] ? SyS_ioctl+0x74/0x80
[   73.835711]  [<ffffffffb9603c56>] ? do_syscall_64+0x76/0x100
[   73.835717]  [<ffffffffb9c38b4e>] ? entry_SYSCALL_64_after_swapgs+0x58/0xc6
[   73.835747] Code: c0 d3 a8 b5 c0 83 f8 a6 74 15 83 f8 e0 49 c7 c0
8c a8 b5 c0 48 c7 c2 74 a8 b5 c0 4c
 0f 45 c2 48 8b 13 89 c1 48 c7 c6 98 bf b5 c0 <48> 8b 7a 08 89 ea 48
81 c7 98 00 00 00 e8 e2 7b f4 f8 f0
 80 63
[   73.835757] RIP  [<ffffffffc0b45d3c>]
snd_usb_endpoint_start+0x23c/0x2f0 [snd_usb_audio]
[   73.835758]  RSP <ffffac190106bcc0>
[   73.835759] CR2: 0000000000000008

I give you more detail, I have Debian Linux 4.9.144-rt93. I tested
under Debian 4.19 and Ubuntu same panic present.
Please help me to fix this problem, this device working fine under
Windows. I believe this problem in Linux audio driver.
I ready to provide any additional details if needs.
-- 
Regards,
Viktor L