After debugging a bit. I narrowed down the problem. It is related to the FireWire800 auido adapter (Tascam FireOne) the device goes in to a non working state. It seems that the the control part of the communication works. But The SoundCard is in a dead lock. And it hangs the kernel diver communication.
The the problem solved by power cycle the Tascan FireOne device and reboot the ubuntu laptop. After the boot then the audio works again and pulseaudio does not hang any more. So it seems the the problem caused by the device communication misbehavior on the filerwire port. I think the kernel driver shall be examined to able to cope with the errors from the device side. Since this breaks done the complete audio subsystem and the machine can not even rebooted. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1880835 Title: pulse audio hangs in kernel call Status in linux package in Ubuntu: Confirmed Bug description: there is no audio device accessible any more and pulse-audio process can not be terminated in kernel log there is such a output: This makes the complete audio unstable in the laptop. I think it is started to happen when I installed Nvidia driver and there is an external monitor attached with DP audio device. [ 364.150644] INFO: task pulseaudio:2183 blocked for more than 120 seconds. [ 364.150646] Tainted: P OE 5.4.0-31-generic #35-Ubuntu [ 364.150647] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 364.150647] pulseaudio D 0 2183 2175 0x00004120 [ 364.150649] Call Trace: [ 364.150653] __schedule+0x2e3/0x740 [ 364.150655] ? dma_pte_clear_level+0x142/0x190 [ 364.150655] schedule+0x42/0xb0 [ 364.150656] schedule_timeout+0x203/0x2f0 [ 364.150657] wait_for_completion+0xb1/0x120 [ 364.150659] ? wake_up_q+0x70/0x70 [ 364.150663] fw_run_transaction+0xdc/0x110 [firewire_core] [ 364.150665] ? fw_core_handle_bus_reset+0x440/0x440 [firewire_core] [ 364.150666] ? free_iova_fast+0x18/0x30 [ 364.150667] ? close_transaction+0x110/0x110 [firewire_core] [ 364.150668] ? intel_unmap+0xd9/0x1c0 [ 364.150670] ? transmit_phy_packet_callback+0x20/0x20 [firewire_core] [ 364.150671] snd_fw_transaction+0xbc/0x110 [snd_firewire_lib] [ 364.150673] ? avc_general_get_plug_info+0x100/0x100 [snd_firewire_lib] [ 364.150674] pcr_modify+0x65/0x100 [snd_firewire_lib] [ 364.150675] cmp_connection_break+0x37/0x50 [snd_firewire_lib] [ 364.150677] snd_oxfw_stream_start_duplex+0x1ee/0x2e0 [snd_oxfw] [ 364.150678] ? wait_woken+0x80/0x80 [ 364.150679] pcm_capture_prepare+0x26/0x50 [snd_oxfw] [ 364.150682] snd_pcm_do_prepare+0x1e/0x30 [snd_pcm] [ 364.150684] snd_pcm_action_single+0x3c/0x80 [snd_pcm] [ 364.150686] snd_pcm_action_nonatomic+0x6e/0x80 [snd_pcm] [ 364.150687] snd_pcm_prepare+0x6a/0x90 [snd_pcm] [ 364.150689] snd_pcm_common_ioctl+0x28c/0xc00 [snd_pcm] [ 364.150691] snd_pcm_ioctl+0x27/0x40 [snd_pcm] [ 364.150692] do_vfs_ioctl+0x407/0x670 [ 364.150694] ? __secure_computing+0x42/0xe0 [ 364.150694] ksys_ioctl+0x67/0x90 [ 364.150695] __x64_sys_ioctl+0x1a/0x20 [ 364.150697] do_syscall_64+0x57/0x190 [ 364.150698] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 364.150699] RIP: 0033:0x7f0bbfa1a37b [ 364.150701] Code: Bad RIP value. [ 364.150701] RSP: 002b:00007ffed915d308 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 364.150702] RAX: ffffffffffffffda RBX: 00005607c7b63de0 RCX: 00007f0bbfa1a37b [ 364.150703] RDX: 0000000000000000 RSI: 0000000000004140 RDI: 000000000000006e [ 364.150703] RBP: 00005607c7b63bb0 R08: 0000000000000000 R09: 0000000000001000 [ 364.150703] R10: 0000000000000004 R11: 0000000000000202 R12: 00005607c7b63de0 [ 364.150704] R13: 00007ffed915d6f0 R14: 0000000000000000 R15: 00007ffed915d480 ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-31-generic 5.4.0-31.35 ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34 Uname: Linux 5.4.0-31-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Wed May 27 10:07:13 2020 InstallationDate: Installed on 2020-02-22 (94 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200220) MachineType: Dell Inc. Precision 7540 ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-31-generic root=UUID=7a5890f6-2724-480a-8fa7-778d07cd929d ro quiet splash vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Daemon not responding. RelatedPackageVersions: linux-restricted-modules-5.4.0-31-generic N/A linux-backports-modules-5.4.0-31-generic N/A linux-firmware 1.187 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/12/2020 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.8.2 dmi.board.name: 0T2FXT dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.8.2:bd03/12/2020:svnDellInc.:pnPrecision7540:pvr:rvnDellInc.:rn0T2FXT:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.family: Precision dmi.product.name: Precision 7540 dmi.product.sku: 0926 dmi.sys.vendor: Dell Inc. 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