Public bug reported:
After rebooting the following was present in dmesg:
[ 242.931199] INFO: task kworker/6:2:174 blocked for more than 120 seconds.
[ 242.931210] Tainted: G OE 5.4.0-21-generic #25-Ubuntu
[ 242.931214] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ 242.931218] kworker/6:2 D 0 174 2 0x80004000
[ 242.931239] Workqueue: events dp_altmode_work [typec_displayport]
[ 242.931243] Call Trace:
[ 242.931260] __schedule+0x2e3/0x740
[ 242.931270] schedule+0x42/0xb0
[ 242.931278] schedule_preempt_disabled+0xe/0x10
[ 242.931282] __mutex_lock.isra.0+0x182/0x4f0
[ 242.931288] ? __switch_to_asm+0x34/0x70
[ 242.931291] ? __switch_to_asm+0x34/0x70
[ 242.931295] ? __switch_to_asm+0x40/0x70
[ 242.931299] ? __switch_to_asm+0x40/0x70
[ 242.931302] __mutex_lock_slowpath+0x13/0x20
[ 242.931305] mutex_lock+0x2e/0x40
[ 242.931315] ucsi_send_command+0x2a/0x60 [typec_ucsi]
[ 242.931323] ucsi_displayport_enter+0x90/0x180 [typec_ucsi]
[ 242.931334] typec_altmode_enter+0x4f/0x60 [typec]
[ 242.931339] dp_altmode_work+0xde/0xf0 [typec_displayport]
[ 242.931346] process_one_work+0x1eb/0x3b0
[ 242.931352] worker_thread+0x4d/0x400
[ 242.931357] kthread+0x104/0x140
[ 242.931362] ? process_one_work+0x3b0/0x3b0
[ 242.931365] ? kthread_park+0x90/0x90
[ 242.931370] ret_from_fork+0x35/0x40
[ 242.931384] INFO: task kworker/4:2:328 blocked for more than 120 seconds.
[ 242.931389] Tainted: G OE 5.4.0-21-generic #25-Ubuntu
[ 242.931391] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ 242.931394] kworker/4:2 D 0 328 2 0x80004000
[ 242.931405] Workqueue: events_long ucsi_init [typec_ucsi]
[ 242.931407] Call Trace:
[ 242.931422] __schedule+0x2e3/0x740
[ 242.931436] schedule+0x42/0xb0
[ 242.931441] schedule_timeout+0x203/0x2f0
[ 242.931449] ? ttwu_do_activate+0x5b/0x70
[ 242.931455] wait_for_completion+0xb1/0x120
[ 242.931461] ? wake_up_q+0x70/0x70
[ 242.931467] __flush_work+0x123/0x1d0
[ 242.931473] ? worker_detach_from_pool+0xb0/0xb0
[ 242.931481] __cancel_work_timer+0x10e/0x190
[ 242.931489] ? kernfs_put+0xf1/0x180
[ 242.931499] cancel_work_sync+0x10/0x20
[ 242.931507] dp_altmode_remove+0x23/0x30 [typec_displayport]
[ 242.931520] typec_remove+0x4b/0x8d [typec]
[ 242.931531] device_release_driver_internal+0xf0/0x1d0
[ 242.931540] device_release_driver+0x12/0x20
[ 242.931546] bus_remove_device+0xe1/0x150
[ 242.931552] device_del+0x165/0x370
[ 242.931559] ? kfree+0x22b/0x240
[ 242.931565] device_unregister+0x1b/0x60
[ 242.931576] typec_unregister_altmode+0x30/0x40 [typec]
[ 242.931582] ucsi_unregister_altmodes+0x42/0xa0 [typec_ucsi]
[ 242.931588] ucsi_unregister_partner.part.0+0x17/0x30 [typec_ucsi]
[ 242.931594] ucsi_init+0x179/0x1c0 [typec_ucsi]
[ 242.931600] process_one_work+0x1eb/0x3b0
[ 242.931605] worker_thread+0x4d/0x400
[ 242.931609] kthread+0x104/0x140
[ 242.931614] ? process_one_work+0x3b0/0x3b0
[ 242.931617] ? kthread_park+0x90/0x90
[ 242.931622] ret_from_fork+0x35/0x40
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-21-generic 5.4.0-21.25
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
ApportVersion: 2.20.11-0ubuntu26
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: nikolaj 2154 F.... pulseaudio
/dev/snd/controlC0: nikolaj 2154 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr 14 22:16:08 2020
InstallationDate: Installed on 2019-11-15 (151 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
MachineType: Dell Inc. XPS 13 9370
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-21-generic
root=/dev/mapper/vgubuntu-root ro quiet splash mem_sleep_default=deep
vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-5.4.0-21-generic N/A
linux-backports-modules-5.4.0-21-generic N/A
linux-firmware 1.187
SourcePackage: linux
UpgradeStatus: Upgraded to focal on 2020-04-04 (10 days ago)
dmi.bios.date: 12/11/2019
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.12.1
dmi.board.name: 0F6P3V
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.12.1:bd12/11/2019:svnDellInc.:pnXPS139370:pvr:rvnDellInc.:rn0F6P3V:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 9370
dmi.product.sku: 07E6
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
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https://bugs.launchpad.net/bugs/1872817
Title:
Workqueue: events dp_altmode_work [typec_displayport]
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