Comment 8 for bug 1880835

I have been using it for a while now and I manage to reproduce the problem with the mainline kernel :
uname ouput:
Linux DEM-RSZABO-U20 5.7.0-050700rc7-generic #202005242331 SMP Sun May 24 23:33:19 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

dmesg output:

[ 172.040868] firewire_ohci 0000:27:00.0: enabling device (0000 -> 0002)
[ 172.045220] usb 7-1.4.2: New USB device found, idVendor=0b0e, idProduct=1113, bcdDevice= 3.04
[ 172.045221] usb 7-1.4.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 172.045222] usb 7-1.4.2: Product: Jabra Engage 75
[ 172.045223] usb 7-1.4.2: Manufacturer: GN Audio A/S
[ 172.045224] usb 7-1.4.2: SerialNumber: 033DCCC2D80F
[ 172.098317] firewire_ohci 0000:27:00.0: isochronous cycle inconsistent
[ 172.098355] firewire_ohci 0000:27:00.0: added OHCI v1.10 device as card 1, 8 IR + 8 IT contexts, quirks 0x0, physUB
[ 172.216832] input: GN Audio A/S Jabra Engage 75 as /devices/pci0000:00/0000:00:1c.0/0000:04:00.0/0000:05:01.0/0000:07:00.0/0000:08:02.0/0000:0b:00.0/usb7/7-1/7-1.4/7-1.4.2/7-1.4.2:1.3/0003:0B0E:1113.0013/input/input52
[ 172.274621] jabra 0003:0B0E:1113.0013: input,hiddev2,hidraw7: USB HID v1.11 Device [GN Audio A/S Jabra Engage 75] on usb-0000:0b:00.0-1.4.2/input3
[ 172.518897] igb 0000:0c:00.0 ens1: igb: ens1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX
[ 172.618312] firewire_core 0000:27:00.0: created device fw0: GUID 000a2702007351d1, S800
[ 172.625488] firewire_core 0000:27:00.0: created device fw1: GUID 00022e0200000007, S400
[ 172.625489] firewire_core 0000:27:00.0: phy config: new root=ffc0, gap_count=5
[ 172.626660] IPv6: ADDRCONF(NETDEV_CHANGE): ens1: link becomes ready
[ 172.739267] thunderbolt 0-1: new device found, vendor=0x5a device=0xde21
[ 172.739268] thunderbolt 0-1: Other World Computing Thunderbolt 3 Dock
[ 173.131591] thunderbolt 0-101: new device found, vendor=0x1e device=0x1
[ 173.131592] thunderbolt 0-101: LG Electronics 34UM95
[ 173.571435] thunderbolt 0-10101: new device found, vendor=0x1 device=0x8004
[ 173.571436] thunderbolt 0-10101: Apple, Inc. Thunderbolt to FireWire Adapter
[ 178.864484] ACPI: button: The lid device is not compliant to SW_LID.
[ 182.938764] logitech-hidpp-device 0003:046D:406D.000E: HID++ 4.5 device connected.
[ 183.180829] logitech-hidpp-device 0003:046D:406D.000E: multiplier = 8
[ 484.390178] INFO: task pulseaudio:2213 blocked for more than 120 seconds.
[ 484.390181] Tainted: P OE 5.7.0-050700rc7-generic #202005242331
[ 484.390182] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 484.390182] pulseaudio D 0 2213 2190 0x00004120
[ 484.390184] Call Trace:
[ 484.390188] __schedule+0x2dd/0x780
[ 484.390190] ? dma_pte_clear_level+0x148/0x1a0
[ 484.390191] schedule+0x55/0xc0
[ 484.390192] schedule_timeout+0x207/0x2f0
[ 484.390194] ? at_context_transmit+0x66/0x1a0 [firewire_ohci]
[ 484.390195] wait_for_completion+0x94/0x100
[ 484.390198] fw_run_transaction+0xdc/0x110 [firewire_core]
[ 484.390200] ? fw_core_handle_bus_reset+0x470/0x470 [firewire_core]
[ 484.390202] ? free_iova_fast+0x18/0x30
[ 484.390204] ? close_transaction+0x110/0x110 [firewire_core]
[ 484.390205] ? free_one_page+0xb5/0x490
[ 484.390206] ? transmit_phy_packet_callback+0x20/0x20 [firewire_core]
[ 484.390209] snd_fw_transaction+0xbc/0x110 [snd_firewire_lib]
[ 484.390210] ? avc_general_get_plug_info+0x100/0x100 [snd_firewire_lib]
[ 484.390212] pcr_modify+0x65/0x100 [snd_firewire_lib]
[ 484.390213] cmp_connection_break+0x37/0x50 [snd_firewire_lib]
[ 484.390215] snd_oxfw_stream_start_duplex+0x1f0/0x2e0 [snd_oxfw]
[ 484.390217] ? wait_woken+0x80/0x80
[ 484.390218] pcm_capture_prepare+0x26/0x50 [snd_oxfw]
[ 484.390221] snd_pcm_do_prepare+0x2c/0x50 [snd_pcm]
[ 484.390223] snd_pcm_action_single+0x3c/0x80 [snd_pcm]
[ 484.390225] snd_pcm_action_nonatomic+0x6e/0x80 [snd_pcm]
[ 484.390226] snd_pcm_prepare+0x6a/0x90 [snd_pcm]
[ 484.390228] snd_pcm_common_ioctl+0xb3b/0xed0 [snd_pcm]
[ 484.390230] ? vm_mmap_pgoff+0xe6/0x120
[ 484.390232] snd_pcm_ioctl+0x27/0x40 [snd_pcm]
[ 484.390233] ksys_ioctl+0x9d/0xd0
[ 484.390235] __x64_sys_ioctl+0x1a/0x20
[ 484.390236] do_syscall_64+0x57/0x1d0
[ 484.390237] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 484.390238] RIP: 0033:0x7fde5b6e037b
[ 484.390241] Code: Bad RIP value.
[ 484.390241] RSP: 002b:00007ffd5367a8f8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
[ 484.390242] RAX: ffffffffffffffda RBX: 0000561a0e3352f0 RCX: 00007fde5b6e037b
[ 484.390243] RDX: 0000000000000001 RSI: 0000000000004140 RDI: 0000000000000047
[ 484.390243] RBP: 0000561a0e348840 R08: 0000000000000000 R09: 0000000000001000
[ 484.390243] R10: 0000000000000004 R11: 0000000000000206 R12: 00000000ffffffda
[ 484.390244] R13: 00007ffd5367ad20 R14: 0000000000000000 R15: 00007ffd5367aab0
[ 484.390287] INFO: task skypeforlinux:8637 blocked for more than 120 seconds.
[ 484.390287] Tainted: P OE 5.7.0-050700rc7-generic #202005242331
[ 484.390288] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 484.390289] skypeforlinux D 0 8637 2962 0x00000000
[ 484.390289] Call Trace:
[ 484.390291] __schedule+0x2dd/0x780
[ 484.390292] schedule+0x55/0xc0
[ 484.390293] schedule_preempt_disabled+0xe/0x10
[ 484.390293] __mutex_lock.isra.0+0x182/0x4f0
[ 484.390294] __mutex_lock_slowpath+0x13/0x20
[ 484.390295] mutex_lock+0x2e/0x40
[ 484.390296] pcm_open+0x1a6/0x2d0 [snd_oxfw]
[ 484.390299] snd_pcm_open_substream+0x94/0x340 [snd_pcm]
[ 484.390301] snd_pcm_open+0xee/0x230 [snd_pcm]
[ 484.390302] ? wake_up_q+0xa0/0xa0
[ 484.390304] snd_pcm_playback_open+0x42/0x70 [snd_pcm]
[ 484.390307] snd_open+0xb4/0x1a0 [snd]
[ 484.390308] chrdev_open+0xd3/0x1c0
[ 484.390309] ? cdev_default_release+0x20/0x20
[ 484.390310] do_dentry_open+0x143/0x3a0
[ 484.390311] vfs_open+0x2d/0x30
[ 484.390312] path_openat+0xb1c/0x10f0
[ 484.390313] do_filp_open+0x91/0x100
[ 484.390315] ? __alloc_fd+0x46/0x150
[ 484.390316] do_sys_openat2+0x210/0x2d0
[ 484.390316] do_sys_open+0x46/0x80
[ 484.390317] __x64_sys_openat+0x20/0x30
[ 484.390318] do_syscall_64+0x57/0x1d0
[ 484.390320] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 484.390320] RIP: 0033:0x7f31f1973d94
[ 484.390321] Code: Bad RIP value.
[ 484.390321] RSP: 002b:00007f31bf7f9eb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
[ 484.390322] RAX: ffffffffffffffda RBX: 0000000000080802 RCX: 00007f31f1973d94
[ 484.390322] RDX: 0000000000080802 RSI: 00007f31bf7fa070 RDI: 00000000ffffff9c
[ 484.390323] RBP: 00007f31bf7fa070 R08: 0000000000000000 R09: 0000000000000011
[ 484.390323] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000080802
[ 484.390324] R13: 0000000000000004 R14: 0000000000000006 R15: 00007f31bf7fa070
[ 489.501821] SGI_video_sync[10387]: segfault at e6 ip 00005569798bef92 sp 00007fd99d7f8680 error 6 in teams[556976ddb000+4bf6000]
[ 489.501825] Code: e8 43 00 00 00 4c 89 f7 e8 db 01 00 00 41 8b 46 10 41 8b 4e 18 c1 e0 0c 25 00 f0 0f 00 c1 e1 14 81 e1 00 00 f0 0f 09 c1 09 d9 <c6> 01 00 81 e3 ff 0f 00 00 c6 03 00 bf 01 00 00 00 e8 38 d0 10 02