Re: NOHZ tick-stop error: local softirq work is pending, handler #08!!! on Dell XPS 13 9360

Paul Menzel
2024-08-21T21:01:53Z

[Added URLs for files.]

Am 21.08.24 um 10:20 schrieb Paul Menzel:
> Dear Anna-Maria,
>
>
> Thank you very much for the support. I was finally able to collect the
> data you asked for.
>
> Am 09.04.24 um 09:57 schrieb Anna-Maria Behnsen:
>> Paul Menzel writes:
>
> […]
>
>>> Am 08.04.24 um 12:10 schrieb Anna-Maria Behnsen:
>>>
>>>> Paul Menzel writes:
>>>
>>>>> On Dell XPS 13 9360/0596KF, BIOS 2.21.0 06/02/2022, with Linux 6.9-
>>>>> rc2+
>>>>> built from commit b1e6ec0a0fd0 (Merge tag 'docs-6.9-fixes' of
>>>>> git://git.lwn.net/linux) the external USB-C adapter Dell DA300 stopped
>>>>> working (only the Ethernet port was used). Linux logged:
>>>>
>>>> thanks for the report. Can you please provide a trace beside the dmesg
>>>> output? The following trace events should be enabled (via kernel
>>>> command
>>>> line):
>>>>
>>>> trace_event=timer:*,timer_migration:*,sched:sched_switch,sched:sched_wakeup,sched:sched_process_hang,irq:softirq_entry,irq:softirq_raise,irq:softirq_exit
>>> Unfortunately I haven’t been able to reproduce it until now. Should it
>>> happen again, I am going to try your suggestion.
>>
>> Thanks for letting me know.
>
> I wanted to configure that in the running system, but wasn’t able to set
> all of these at once with `set_event`:
>
>     echo 'timer:*,timer_migration:*,sched:sched_switch,sched:sched_wakeup,sched:sched_process_hang,irq:softirq_entry,irq:softirq_raise,irq:softirq_exit' | sudo tee /sys/kernel/tracing/set_event
>
> For some reason setting them individually also did *not* work:
>
>     for e in timer:* timer_migration:* sched:sched_switch sched:sched_wakeup sched:sched_process_hang irq:softirq_entry irq:softirq_raise irq:softirq_exit'; do echo "$e" | sudo tee -a /sys/kernel/tracing/set_event; done
>
> I then used
>
>     echo 1 | sudo tee /sys/kernel/tracing/events/timer/enable
>     echo 1 | sudo tee /sys/kernel/tracing/events/timer_migration/enable
>     echo 1 | sudo tee /sys/kernel/tracing/events/sched/sched_switch/enable
>     echo 1 | sudo tee /sys/kernel/tracing/events/sched/sched_wakeup/enable
>     echo 1 | sudo tee /sys/kernel/tracing/events/sched/sched_process_hang/enable
>     echo 1 | sudo tee /sys/kernel/tracing/events/irq/softirq_entry/enable
>     echo 1 | sudo tee /sys/kernel/tracing/events/irq/softirq_raise/enable
>     echo 1 | sudo tee /sys/kernel/tracing/events/irq/softirq_exit/enable
>
> and also had to increase the buffer to bridge the gap between the event
> and me noticing it:
>
>     echo 96000 | sudo tee /sys/kernel/tracing/buffer_size_kb
>
> Then, with Linux v6.11-rc4-11-g521b1e7f4cf0b, I was able to get the
> trace for the event below:
>
>     [ 7542.706299] NOHZ tick-stop error: local softirq work is pending, handler #08!!!
>
> $ sudo cat /sys/kernel/tracing/trace
> […]
>  MediaPD~der #28-14000   [000] d..1.  7542.703768: hrtimer_cancel: hrtimer=000000008d2c9f3f
>  MediaPD~der #28-14000   [000] .....  7542.703810: hrtimer_init: hrtimer=00000000c6f259e7 clockid=CLOCK_MONOTONIC mode=ABS
>  MediaPD~der #28-14000   [000] d..1.  7542.703812: hrtimer_start: hrtimer=00000000c6f259e7 function=hrtimer_wakeup expires=7602581538204 softexpires=7602581488204 mode=ABS
>  MediaPD~der #28-14000   [000] d..2.  7542.703821: sched_switch: prev_comm=MediaPD~der #28 prev_pid=14000 prev_prio=120 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120
>           <idle>-0       [000] dN.2.  7542.703931: sched_wakeup: comm=ImageBridgeChld pid=6041 prio=120 target_cpu=000
>           <idle>-0       [000] d..2.  7542.703937: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=ImageBridgeChld next_pid=6041 next_prio=120
>  ImageBridgeChld-6041    [000] d..2.  7542.704041: sched_switch: prev_comm=ImageBridgeChld prev_pid=6041 prev_prio=120 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120
>           <idle>-0       [000] dN.2.  7542.704174: sched_wakeup: comm=Renderer pid=4113 prio=120 target_cpu=000
>           <idle>-0       [000] d..2.  7542.704179: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=Renderer next_pid=4113 next_prio=120
>         Renderer-4113    [000] d..2.  7542.704245: sched_switch: prev_comm=Renderer prev_pid=4113 prev_prio=120 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120
>           <idle>-0       [000] dNh2.  7542.704260: sched_wakeup: comm=IPC I/O Child pid=6029 prio=120 target_cpu=000
>           <idle>-0       [000] d..2.  7542.704267: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=IPC I/O Child next_pid=6029 next_prio=120
>    IPC I/O Child-6029    [000] d..2.  7542.704340: sched_switch: prev_comm=IPC I/O Child prev_pid=6029 prev_prio=120 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120
>           <idle>-0       [000] dN.2.  7542.704786: sched_wakeup: comm=Compositor pid=4123 prio=120 target_cpu=000
>           <idle>-0       [000] d..2.  7542.704791: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=Compositor next_pid=4123 next_prio=120
>       Compositor-4123    [000] d..2.  7542.704944: sched_switch: prev_comm=Compositor prev_pid=4123 prev_prio=120 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120
>           <idle>-0       [000] dN.2.  7542.705943: sched_wakeup: comm=Compositor pid=4123 prio=120 target_cpu=000
>           <idle>-0       [000] d..2.  7542.705950: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=Compositor next_pid=4123 next_prio=120
>       Compositor-4123    [000] d..2.  7542.706105: sched_switch: prev_comm=Compositor prev_pid=4123 prev_prio=120 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120
>           <idle>-0       [000] d.h2.  7542.706328: hrtimer_cancel: hrtimer=000000009bbda66a
>           <idle>-0       [000] d.h1.  7542.706329: hrtimer_expire_entry: hrtimer=000000009bbda66a function=tick_nohz_handler now=7542584007490
>           <idle>-0       [000] d.h1.  7542.706333: softirq_raise: vec=9 [action=RCU]
>           <idle>-0       [000] d.h1.  7542.706338: softirq_raise: vec=7 [action=SCHED]
>           <idle>-0       [000] d.h1.  7542.706339: hrtimer_expire_exit: hrtimer=000000009bbda66a
>           <idle>-0       [000] d.h2.  7542.706340: hrtimer_start: hrtimer=000000009bbda66a function=tick_nohz_handler expires=7542588000000 softexpires=7542588000000 mode=ABS
>           <idle>-0       [000] ..s1.  7542.706345: softirq_entry: vec=7 [action=SCHED]
>           <idle>-0       [000] ..s1.  7542.706359: softirq_exit: vec=7 [action=SCHED]
>           <idle>-0       [000] ..s1.  7542.706360: softirq_entry: vec=9 [action=RCU]
>           <idle>-0       [000] ..s1.  7542.706362: softirq_exit: vec=9 [action=RCU]
>           <idle>-0       [000] dNh4.  7542.707672: sched_wakeup: comm=irq/51-DLL075B: pid=194 prio=49 target_cpu=000
>           <idle>-0       [000] d..2.  7542.707685: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=irq/51-DLL075B: next_pid=194 next_prio=49
>  irq/51-DLL075B:-194     [000] .....  7542.707708: timer_init: timer=00000000630ae178
>  irq/51-DLL075B:-194     [000] d..1.  7542.707710: timer_start: timer=00000000630ae178 function=process_timeout expires=4296778179 [timeout=250] bucket_expiry=4296778184 cpu=0 idx=121 flags=
>  irq/51-DLL075B:-194     [000] d..2.  7542.707718: sched_switch: prev_comm=irq/51-DLL075B: prev_pid=194 prev_prio=49 prev_state=D ==> next_comm=swapper/0 next_pid=0 next_prio=120
>           <idle>-0       [000] dN.2.  7542.709072: sched_wakeup: comm=AudioIP~ent RPC pid=6671 prio=120 target_cpu=000
> […]
>
> The trace file is 320 MB big. If you need the full trace and log, please
> tell me, and I’ll upload it somewhere.

https://owww.molgen.mpg.de/~pmenzel/20240821--linux-6.10-rc4+.txt
https://owww.molgen.mpg.de/~pmenzel/20240821--soft-irq--trace.7z

> Kind regards,
>
> Paul