Hi

Op 25-07-2021 om 08:05 schreef Felipe Balbi:
> Hi,
>
> Ferry Toth <fntoth@gmail.com> writes:
>>>>>> Hardware name: Intel Corporation Merrifield/BODEGA BAY, BIOS 542
>>>>>> 2015.01.21:18.19.48
>>>>>> RIP: 0010:0x500000000
>>>>>> Code: Unable to access opcode bytes at RIP 0x4ffffffd6.
>>>>>> RSP: 0018:ffffa4d00045fc28 EFLAGS: 00010046
>>>>>> RAX: 0000000500000000 RBX: ffff8cd546aed200 RCX: 0000000000000000
>>>>>> RDX: 0000000000000000 RSI: ffff8cd547bfcae0 RDI: ffff8cd546aed200
>>>>>> RBP: ffff8cd547bfcae0 R08: 0000000000000000 R09: 0000000000000001
>>>>>> R10: ffff8cd541fd28c0 R11: 0000000000000000 R12: ffff8cd547342828
>>>>>> R13: ffff8cd546aed248 R14: 0000000000000000 R15: ffff8cd548b1d000
>>>>>> FS:  0000000000000000(0000) GS:ffff8cd57e200000(0000) knlGS:0000000000000000
>>>>>> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>>>> CR2: 0000000500000000 CR3: 000000000311e000 CR4: 00000000001006f0
>>>>>> Call Trace:
>>>>>>      ? dwc3_remove_requests.constprop.0+0x14d/0x170
>>>>>>      ? __dwc3_gadget_ep_disable+0x7a/0x160
>>>>>>      ? dwc3_gadget_ep_disable+0x3d/0xd0
>>>>>>      ? usb_ep_disable+0x1c/0x
>>>>>>      ? u_audio_stop_capture+0x79/0x120 [u_audio]
>>>>>>      ? afunc_set_alt+0x73/0x80 [usb_f_uac2]
>>>>>>      ? composite_setup+0x224/0x1b90 [libcomposite]
>>>>>>      ? __dwc3_gadget_kick_transfer+0x160/0x400
>>>>>>      ? dwc3_gadget_ep_queue+0xf3/0x1a0
>>>>>>      ? configfs_composite_setup+0x6b/0x90 [libcomposite]
>>>>>>      ? configfs_composite_setup+0x6b/0x90 [libcomposite]
>>>>>>      ? dwc3_ep0_interrupt+0x459/0xa40
>>>>>>      ? dwc3_thread_interrupt+0x8ee/0xf40
>>>>>>      ? __schedule+0x235/0x6c0
>>>>>>      ? disable_irq_nosync+0x10/0x10
>>>>>>      ? irq_thread_fn+0x1b/0x60
>>>>>>      ? irq_thread+0xc0/0x160
>>>>>>      ? irq_thread_check_affinity+0x70/0x70
>>>>>>      ? irq_forced_thread_fn+0x70/0x70
>>>>>>      ? kthread+0x122/0x140
>>>>>>      ? set_kthread_struct+0x40/0x40
>>>>>>      ? ret_from_fork+0x22/0x30
>>>>> Do you mind enabling dwc3 traces and collecting them? Trying to figure
>>>>> out how we got here.
>>>>>
>>>> I'll try if I can get the same error by booting with USB in host mode
>>>> and then switch to device mode. If so I can enable traces and collect as
>>>> you explained me before.
>>>>
>>>> I'll try before monday, as then I fly for a holiday and will not be
>>>> available before rc5.
>>> you can enable all of those with kernel cmdline :-)
>>>
>>> https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html
>>>
>>> you need ftrace_dump_on_oops=1 and also need the correct options on
>>> trace_buf_size and trace_event.
>>>
>> On Edison-Arduino I have a switch to go to device mode, after which
>> udev triggers a script configure gadgets through configfs.
>>
>> I tried to log following these instructions:
>>
>> https://www.kernel.org/doc/html/latest/driver-api/usb/dwc3.html#reporting-bugs  <https://www.kernel.org/doc/html/latest/driver-api/usb/dwc3.html#reporting-bugs>
>>
>> Unfortunately the kernel crashes so badly I can not get to the ` cp
>> /t/trace /root/trace.txt` line (after a while the watchdog kicks).
>>
>> What to do next?
> Pass ftrace_dump_on_oops to kernel cmdline.
>
No sure if I did this right, on oops everything is pushed to console 
(115k2 serial), I hope nothing essential is lost.

I copied the screen buffer to file see attached.