Hi Matthias,
Am 21.12.22 um 20:02 schrieb Matthias Kaehlcke:
Hi Stefan,
On Wed, Dec 21, 2022 at 07:00:41PM +0100, Stefan Wahren wrote:
I will try to play with lock debugging.
Thanks, hopefully that can provide some hint.
DETECT_HUNG_TASK reveals this in error case:
[ 243.676253] INFO: task kworker/2:1:44 blocked for more than 122 seconds.
[ 243.676284] Not tainted 6.1.0-00007-g22fada783b9f #32
[ 243.676294] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 243.676303] task:kworker/2:1 state:D stack:0 pid:44
ppid:2 flags:0x00000000
[ 243.676329] Workqueue: events onboard_hub_attach_usb_driver
[onboard_usb_hub]
[ 243.676388] __schedule from schedule+0x58/0xf8
[ 243.676419] schedule from schedule_preempt_disabled+0x1c/0x2c
[ 243.676445] schedule_preempt_disabled from
__mutex_lock.constprop.0+0x29c/0x948
[ 243.676474] __mutex_lock.constprop.0 from __driver_attach+0x74/0x188
[ 243.676503] __driver_attach from bus_for_each_dev+0x70/0xb0
[ 243.676532] bus_for_each_dev from
onboard_hub_attach_usb_driver+0xc/0x28 [onboard_usb_hub]
[ 243.676587] onboard_hub_attach_usb_driver [onboard_usb_hub] from
process_one_work+0x1f8/0x520
[ 243.676637] process_one_work from worker_thread+0x40/0x55c
[ 243.676663] worker_thread from kthread+0xf0/0x110
[ 243.676685] kthread from ret_from_fork+0x14/0x2c
[ 243.676705] Exception stack(0xf091dfb0 to 0xf091dff8)
[ 243.676720] dfa0: 00000000
00000000 00000000 00000000
[ 243.676737] dfc0: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[ 243.676752] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 243.676788] INFO: task systemd-udevd:148 blocked for more than 122
seconds.
[ 243.676800] Not tainted 6.1.0-00007-g22fada783b9f #32
[ 243.676809] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 243.676817] task:systemd-udevd state:D stack:0 pid:148
ppid:144 flags:0x00000081
[ 243.676839] __schedule from schedule+0x58/0xf8
[ 243.676864] schedule from schedule_timeout+0xb4/0x15c
[ 243.676893] schedule_timeout from __wait_for_common+0xc4/0x228
[ 243.676922] __wait_for_common from __flush_work+0x1a8/0x360
[ 243.676949] __flush_work from __cancel_work_timer+0x10c/0x1e4
[ 243.676975] __cancel_work_timer from onboard_hub_remove+0x28/0xbc
[onboard_usb_hub]
[ 243.677021] onboard_hub_remove [onboard_usb_hub] from
platform_remove+0x20/0x4c
[ 243.677067] platform_remove from
device_release_driver_internal+0x194/0x21c
[ 243.677092] device_release_driver_internal from
bus_remove_device+0xcc/0xf8
[ 243.677124] bus_remove_device from device_del+0x16c/0x468
[ 243.677159] device_del from platform_device_del.part.0+0x10/0x74
[ 243.677187] platform_device_del.part.0 from
platform_device_unregister+0x18/0x24
[ 243.677216] platform_device_unregister from
of_platform_device_destroy+0x98/0xa8
[ 243.677249] of_platform_device_destroy from
onboard_hub_destroy_pdevs+0x48/0x6c
[ 243.677287] onboard_hub_destroy_pdevs from hub_disconnect+0x104/0x174
[ 243.677321] hub_disconnect from usb_unbind_interface+0x78/0x26c
[ 243.677356] usb_unbind_interface from
device_release_driver_internal+0x194/0x21c
[ 243.677388] device_release_driver_internal from
bus_remove_device+0xcc/0xf8
[ 243.677419] bus_remove_device from device_del+0x16c/0x468
[ 243.677452] device_del from usb_disable_device+0xcc/0x178
[ 243.677486] usb_disable_device from usb_set_configuration+0x4ec/0x8d0
[ 243.677523] usb_set_configuration from usb_unbind_device+0x24/0x7c
[ 243.677560] usb_unbind_device from
device_release_driver_internal+0x194/0x21c
[ 243.677590] device_release_driver_internal from device_reprobe+0x18/0x90
[ 243.677620] device_reprobe from __usb_bus_reprobe_drivers+0x40/0x6c
[ 243.677648] __usb_bus_reprobe_drivers from bus_for_each_dev+0x70/0xb0
[ 243.677676] bus_for_each_dev from usb_register_device_driver+0x9c/0xd0
[ 243.677713] usb_register_device_driver from
onboard_hub_init+0x30/0x1000 [onboard_usb_hub]
[ 243.677765] onboard_hub_init [onboard_usb_hub] from
do_one_initcall+0x40/0x204
[ 243.677811] do_one_initcall from do_init_module+0x44/0x1d4
[ 243.677840] do_init_module from sys_finit_module+0xbc/0xf8
[ 243.677865] sys_finit_module from __sys_trace_return+0x0/0x10
[ 243.677887] Exception stack(0xf4659fa8 to 0xf4659ff0)
[ 243.677904] 9fa0: bf369800 0051dba8 00000006
b6e438e0 00000000 b6e443f4
[ 243.677921] 9fc0: bf369800 0051dba8 00000000 0000017b 00531658
0051a1dc 00526398 00000000
[ 243.677935] 9fe0: befbb160 befbb150 b6e3a9d8 b6f2aae0
