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Subject: Re: [PATCH v10 0/6] Re-introduce TX FIFO resize for larger EP
 bursting
To:     Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
        Pavel Hofman <pavel.hofman@ivitera.com>,
        Felipe Balbi <balbi@kernel.org>
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        Ruslan Bilovol <ruslan.bilovol@gmail.com>
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From:   Ferry Toth <fntoth@gmail.com>
Message-ID: <9c97fa38-e66e-5b31-a79a-2b5d24f3cc66@gmail.com>
Date:   Sun, 22 Aug 2021 22:10:27 +0200
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Op 21-08-2021 om 04:57 schreef Thinh Nguyen:
> Pavel Hofman wrote:
>>
>> Dne 19. 08. 21 v 22:10 Ferry Toth napsal(a):
>>> Hi
>>>
>>> Op 19-08-2021 om 09:51 schreef Pavel Hofman:
>>>> Hi,
>>>>
>>>> Dne 18. 08. 21 v 21:07 Ferry Toth napsal(a):
>>>>> Hi,
>>>>>
>>>>> Op 18-08-2021 om 00:00 schreef Ferry Toth:
>>>>>> Hi,
>>>>>>
>>>>>> Op 16-08-2021 om 07:18 schreef Felipe Balbi:
>>>>>>> Hi,
>>>>>>>
>>>>>>> Ferry Toth <fntoth@gmail.com> writes:
>>>>>>>>> Ferry Toth <fntoth@gmail.com> writes:
>>>>>>>>>>>>> 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]
>>>>>>>>>>> So this is triggered by a SetInterface request...
>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>          ? 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://urldefense.com/v3/__https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html__;!!A4F2R9G_pg!PZHOWnH3HDs-9a9bz4KLDShZpsubSfG84fu3wEZyK4Q_Wvv2lhHKuk7LJpWPAPch0qja$
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> 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://urldefense.com/v3/__https://www.kernel.org/doc/html/latest/driver-api/usb/dwc3.html*reporting-bugs__;Iw!!A4F2R9G_pg!PZHOWnH3HDs-9a9bz4KLDShZpsubSfG84fu3wEZyK4Q_Wvv2lhHKuk7LJpWPAG64agnA$
>>>>>>>>>>>>>> <https://urldefense.com/v3/__https://www.kernel.org/doc/html/latest/driver-api/usb/dwc3.html*reporting-bugs__;Iw!!A4F2R9G_pg!PZHOWnH3HDs-9a9bz4KLDShZpsubSfG84fu3wEZyK4Q_Wvv2lhHKuk7LJpWPAG64agnA$
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> 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.
>>>>>>>>>>> Thank you, I bet it took quite a some time :-) Anyway, looking at
>>>>>>>>>>> the logs around Set Interface requests, we can track every
>>>>>>>>>>> endpoint
>>>>>>>>>>> that's disabled. I'll take a guess and assume we're failing at
>>>>>>>>>>> the last
>>>>>>>>>>> Set Interface, that means we should have something odd with
>>>>>>>>>>> ep6in, but
>>>>>>>>>>> everything looks fine in the trace output:
>>>>>>>>>>>
>>>>>>>>>>> [   75.823107] irq/14-d-596       0d... 42789194us :
>>>>>>>>>>> dwc3_gadget_ep_enable: ep6in: mps 192/346 streams 16 burst 0
>>>>>>>>>>> ring 0/0 flags E:swbp:<
>>>>>>>>>>> [   75.835472] irq/14-d-596       0d... 42789198us :
>>>>>>>>>>> dwc3_alloc_request: ep6in: req 0000000002c71409 length 0/0 zsI
>>>>>>>>>>> ==> 0
>>>>>>>>>>> [   75.846416] irq/14-d-596       0d... 42789202us :
>>>>>>>>>>> dwc3_ep_queue: ep6in: req 0000000002c71409 length 0/192 zsI
>>>>>>>>>>> ==> -115
>>>>>>>>>>> [   75.857360] irq/14-d-596       0d... 42789204us :
>>>>>>>>>>> dwc3_alloc_request: ep6in: req 00000000a324f5d0 length 0/0 zsI
>>>>>>>>>>> ==> 0
>>>>>>>>>>> [   75.868301] irq/14-d-596       0d... 42789206us :
>>>>>>>>>>> dwc3_ep_queue: ep6in: req 00000000a324f5d0 length 0/192 zsI
>>>>>>>>>>> ==> -115
>>>>>>>>>>> [   75.879244] irq/14-d-596       0d... 42789209us :
>>>>>>>>>>> dwc3_event: event (000020c2): ep0in: Transfer Not Ready [0]
>>>>>>>>>>> (Not Active) [Status Phase]
>>>>>>>>>>> [   75.891880] irq/14-d-596       0d... 42789211us :
>>>>>>>>>>> dwc3_prepare_trb: ep0in: trb 000000004c0ae319 (E0:D0) buf
>>>>>>>>>>> 000000001bded000 size 0 ctrl 00000c33 (HLcs:SC:status2)
>>>>>>>>>>> [   75.989131] irq/14-d-596       0d... 42789224us :
>>>>>>>>>>> dwc3_gadget_ep_cmd: ep0in: cmd 'Start Transfer' [406] params
>>>>>>>>>>> 00000000 1bded000 00000000 --> status: Successful
>>>>>>>>>>> [   76.096261] irq/14-d-596       0d... 42789272us :
>>>>>>>>>>> dwc3_event: event (0000c042): ep0in: Transfer Complete (sIL)
>>>>>>>>>>> [Status Phase]
>>>>>>>>>>> [   76.107834] irq/14-d-596       0d... 42789275us :
>>>>>>>>>>> dwc3_complete_trb: ep0out: trb 000000004c0ae319 (E0:D0) buf
>>>>>>>>>>> 000000001bded000 size 0 ctrl 00000c32 (hLcs:SC:status2)
>>>>>>>>>>> [   76.122944] irq/14-d-596       0d... 42789277us :
>>>>>>>>>>> dwc3_gadget_giveback: ep0out: req 00000000cb1bd3cd length 0/0
>>>>>>>>>>> zsI ==> 0
>>>>>>>>>>> [   76.134160] irq/14-d-596       0d... 42789280us :
>>>>>>>>>>> dwc3_prepare_trb: ep0out: trb 000000004c0ae319 (E0:D0) buf
>>>>>>>>>>> 000000001bded000 size 8 ctrl 00000c23 (HLcs:SC:setup)
>>>>>>>>>>> [   76.231322] irq/14-d-596       0d... 42789292us :
>>>>>>>>>>> dwc3_gadget_ep_cmd: ep0out: cmd 'Start Transfer' [406] params
>>>>>>>>>>> 00000000 1bded000 00000000 --> status: Successful
>>>>>>>>>>> [   76.297418] kworker/-23        0d... 42789670us :
>>>>>>>>>>> dwc3_ep_queue: ep3in: req 0000000029586135 length 0/96 ZsI ==>
>>>>>>>>>>> -115
>>>>>>>>>>> [   76.308278] kworker/-23        0d... 42789695us :
>>>>>>>>>>> dwc3_prepare_trb: ep3in: trb 00000000b81213d6 (E1:D0) buf
>>>>>>>>>>> 0000000003b7a800 size 96 ctrl 00000811 (Hlcs:sC:normal)
>>>>>>>>>>> [   76.395294] kworker/-23        0d... 42789707us :
>>>>>>>>>>> dwc3_gadget_ep_cmd: ep3in: cmd 'Update Transfer' [60007]
>>>>>>>>>>> params 00000000 00000000 00000000 --> status: Successful
>>>>>>>>>>> [   76.471900] irq/14-d-596       0d... 42789842us :
>>>>>>>>>>> dwc3_event: event (0000c040): ep0out: Transfer Complete (sIL)
>>>>>>>>>>> [Setup Phase]
>>>>>>>>>>> [   76.489308] irq/14-d-596       0d... 42789845us :
>>>>>>>>>>> dwc3_ctrl_req: Set Interface(Intf = 5, Alt.Setting = 0)
>>>>>>>>>>> [   76.505650] irq/14-d-596       0d... 42789851us :
>>>>>>>>>>> dwc3_ep_dequeue: ep6in: req 0000000002c71409 length 0/192 zsI
>>>>>>>>>>> ==> -115
>>>>>>>>>>> [   76.523315] irq/14-d-596       0d... 42789854us :
>>>>>>>>>>> dwc3_gadget_giveback: ep6in: req 0000000002c71409 length 0/192
>>>>>>>>>>> zsI ==> -104
>>>>>>>>>>> [   76.541427] irq/14-d-596       0d... 42789857us :
>>>>>>>>>>> dwc3_free_request: ep6in: req 0000000002c71409 length 0/192
>>>>>>>>>>> zsI ==> -104
>>>>>>>>>>> [   76.559267] irq/14-d-596       0d... 42789859us :
>>>>>>>>>>> dwc3_ep_dequeue: ep6in: req 00000000a324f5d0 length 0/192 zsI
>>>>>>>>>>> ==> -115
>>>>>>>>>>> [   76.576937] irq/14-d-596       0d... 42789861us :
>>>>>>>>>>> dwc3_gadget_giveback: ep6in: req 00000000a324f5d0 length 0/192
>>>>>>>>>>> zsI ==> -104
>>>>>>>>>>> [   76.595046] irq/14-d-596       0d... 42789862us :
>>>>>>>>>>> dwc3_free_request: ep6in: req 00000000a324f5d0 length 0/192
>>>>>>>>>>> zsI ==> -104
>>>>>>>>>>> [   76.612892] irq/14-d-596       0d... 42789865us :
>>>>>>>>>>> dwc3_gadget_ep_disable: ep6in: mps 192/346 streams 16 burst 0
>>>>>>>>>>> ring 0/0 flags E:swbp:<
>>>>>>>>>>> [   76.665535] irq/14-d-596       0d... 42789873us :
>>>>>>>>>>> dwc3_event: event (000020c2): ep0in: Transfer Not Ready [0]
>>>>>>>>>>> (Not Active) [Status Phase]
>>>>>>>>>>> [   76.684716] irq/14-d-596       0d... 42789875us :
>>>>>>>>>>> dwc3_prepare_trb: ep0in: trb 000000004c0ae319 (E0:D0) buf
>>>>>>>>>>> 000000001bded000 size 0 ctrl 00000c33 (HLcs:SC:status2)
>>>>>>>>>>> [   76.819195] irq/14-d-596       0d... 42789886us :
>>>>>>>>>>> dwc3_gadget_ep_cmd: ep0in: cmd 'Start Transfer' [406] params
>>>>>>>>>>> 00000000 1bded000 00000000 --> status: Successful
>>>>>>>>>>> [   76.926324] irq/14-d-596       0d... 42789930us :
>>>>>>>>>>> dwc3_event: event (0000c042): ep0in: Transfer Complete (sIL)
>>>>>>>>>>> [Status Phase]
>>>>>>>>>>> [   76.937892] irq/14-d-596       0d... 42789933us :
>>>>>>>>>>> dwc3_complete_trb: ep0out: trb 000000004c0ae319 (E0:D0) buf
>>>>>>>>>>> 000000001bded000 size 0 ctrl 00000c32 (hLcs:SC:status2)
>>>>>>>>>>> [   76.953003] irq/14-d-596       0d... 42789935us :
>>>>>>>>>>> dwc3_gadget_giveback: ep0out: req 00000000cb1bd3cd length 0/0
>>>>>>>>>>> zsI ==> 0
>>>>>>>>>>> [   76.964217] irq/14-d-596       0d... 42789938us :
>>>>>>>>>>> dwc3_prepare_trb: ep0out: trb 000000004c0ae319 (E0:D0) buf
>>>>>>>>>>> 000000001bded000 size 8 ctrl 00000c23 (HLcs:SC:setup)
>>>>>>>>>>> [   77.061379] irq/14-d-596       0d... 42789950us :
>>>>>>>>>>> dwc3_gadget_ep_cmd: ep0out: cmd 'Start Transfer' [406] params
>>>>>>>>>>> 00000000 1bded000 00000000 --> status: Successful
>>>>>>>>>>> [   77.168595] irq/14-d-596       0d... 42790509us :
>>>>>>>>>>> dwc3_event: event (0000c040): ep0out: Transfer Complete (sIL)
>>>>>>>>>>> [Setup Phase]
>>>>>>>>>>> [   77.180159] irq/14-d-596       0d... 42790512us :
>>>>>>>>>>> dwc3_ctrl_req: Get String Descriptor(Index = 18, Length = 255)
>>>>>>>>>>> [   77.190578] irq/14-d-596       0d... 42790537us :
>>>>>>>>>>> dwc3_prepare_trb: ep0in: trb 000000004c0ae319 (E0:D0) buf
>>>>>>>>>>> 0000000003b68000 size 36 ctrl 00000c53 (HLcs:SC:data)
>>>>>>>>>>> [   77.287648] irq/14-d-596       0d... 42790550us :
>>>>>>>>>>> dwc3_gadget_ep_cmd: ep0in: cmd 'Start Transfer' [406] params
>>>>>>>>>>> 00000000 1bded000 00000000 --> status: Successful
>>>>>>>>>>> [   77.333107] irq/14-d-596       0d... 42790557us :
>>>>>>>>>>> dwc3_event: event (000010c2): ep0in: Transfer Not Ready [0]
>>>>>>>>>>> (Not Active) [Data Phase]
>>>>>>>>>>> [   77.407223] irq/14-d-596       0d... 42790575us :
>>>>>>>>>>> dwc3_event: event (000090c2): ep0in: Transfer Not Ready [0]
>>>>>>>>>>> (Active) [Data Phase]
>>>>>>>>>>> [   77.480985] irq/14-d-596       0d... 42790588us :
>>>>>>>>>>> dwc3_event: event (0000c042): ep0in: Transfer Complete (sIL)
>>>>>>>>>>> [Data Phase]
>>>>>>>>>>> [   77.492376] irq/14-d-596       0d... 42790590us :
>>>>>>>>>>> dwc3_complete_trb: ep0out: trb 000000004c0ae319 (E0:D0) buf
>>>>>>>>>>> 0000000003b68000 size 0 ctrl 00000c52 (hLcs:SC:data)
>>>>>>>>>>> [   77.507221] irq/14-d-596       0d... 42790595us :
>>>>>>>>>>> dwc3_gadget_giveback: ep0out: req 00000000cb1bd3cd length
>>>>>>>>>>> 36/36 ZsI ==> 0
>>>>>>>>>>> [   77.518609] irq/14-d-596       0d... 42790597us :
>>>>>>>>>>> dwc3_event: event (000020c0): ep0out: Transfer Not Ready [0]
>>>>>>>>>>> (Not Active) [Status Phase]
>>>>>>>>>>> [   77.531332] irq/14-d-596       0d... 42790598us :
>>>>>>>>>>> dwc3_prepare_trb: ep0out: trb 000000004c0ae319 (E0:D0) buf
>>>>>>>>>>> 000000001bded000 size 0 ctrl 00000c43 (HLcs:SC:status3)
>>>>>>>>>>> [   77.628669] irq/14-d-596       0d... 42790609us :
>>>>>>>>>>> dwc3_gadget_ep_cmd: ep0out: cmd 'Start Transfer' [406] params
>>>>>>>>>>> 00000000 1bded000 00000000 --> status: Successful
>>>>>>>>>>>
>>>>>>>>>>> Do you mind adding a few prints in dwc3_remove_requests to
>>>>>>>>>>> tell us which
>>>>>>>>>>> endpoint is being processed? Then we'll know for sure which
>>>>>>>>>>> one caused
>>>>>>>>>>> the crash.
>>>>>>>>>>>
>>>>>>>>>> I wouldn't mind but am leaving on a holiday, won't have time
>>>>>>>>>> until 6 aug.
>>>>>>>>> not a problem, we'll still be here when you're back :-)
>>>>>>>> Well, let's go then :-)
>>>>>>>>
>>>>>>>> To get back in the mood I have retested 5.13.0, 5.14.0-rc1,
>>>>>>>> 5.14.0-rc2
>>>>>>>> and 5.14.0-rc5.
>>>>>>>>
>>>>>>>> I find that 5.13.0 works fine, and the issue starts from 5.14.0-rc1.
>>>>>>> That's great finding. We have a bisection point. There are a total of
>>>>>>> 13764 commits between v5.13 and v5.14-rc1
>>>>>>>
>>>>>>>      $ git rev-list  --count v5.13..v5.14-rc1
>>>>>>>      13764
>>>>>>>
>>>>>>> git bisect should find the offending commit in at most 14 tries.
>>>>>>> That's
>>>>>>> not too bad.
>>>>>> I correctly guesstimated that the problem got introduced by the usb
>>>>>> merge 79160a60
>>>>>>
>>>>>> "Merge tag 'usb-5.14-rc1' of
>>>>>> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb"
>>>>>>
>>>>>> 116 commits(7 bisects).
>>>>>>
>>>>>> 24f779dac8f3efb9629adc0e486914d93dc45517 is the first bad commit
>>>>>>
>>>>>> "usb: gadget: f_uac2/u_audio: add feedback endpoint support"
>>>>>>
>>>>>> Ruslan's 3 patches are related to each other so I reverted all
>>>>>> three 24f779da...e89bb428 and applied the reverts to rc1.
>>>>>>
>>>>>> I can confirm this indeed resolves the problem in rc1.
>>>>>>
>>>>>> Is late now, tomorrow evening I will apply the reverts to rc6.
>>>>>
>>>>> With these reverts rc6 works fine as well.
>>>>>
>>>>> So, where do we go from here?
>>>>>
>>>>
>>>> I know the patches have been tested on dwc2 (by me and others).  I do
>>>> not know if Ruslan or Jerome tested them on dwc3 but probably not.
>>>> Ruslan has talked about RPi (my case too) and BeagleboneBlack, both
>>>> with dwc2. Perhaps the dwc2 behaves a bit differently than dwc3?
>>>>
>>>> The patches add a new EP-IN for async feedback. I am sorry I have not
>>>> followed your long thread (it started as unrelated to uac). Does the
>>>> problem appear with f_uac1 or f_uac2? Please how have you reached the
>>>> above problem?
>>>
>>> I'm sorry too. I first believed the issue was related to the patch
>>> mentioned in the subject line.
>>>
>>> The problem appaers with f_uac2. I bost Edison_Arduino board in host
>>> mode (there is a switch allowing to select host/device mode). When
>>> flipping the switch to device mode udev run a script:
>>> But as I am using configfs (excerpt follows) and just disabling the
>>> last 2 line resolves the issue, I'm guessing uac2 is the issue. Or
>>> exceeding the available resources.
>>>
>>> # Create directory structure
>>> mkdir "${GADGET_BASE_DIR}"
>>> cd "${GADGET_BASE_DIR}"
>>> mkdir -p configs/c.1/strings/0x409
>>> mkdir -p strings/0x409
>>>
>>> # Serial device
>>> mkdir functions/gser.usb0
>>> ln -s functions/gser.usb0 configs/c.1/
>>> ###
>>>
>>> # Ethernet device
>>> mkdir functions/eem.usb0
>>> echo "${DEV_ETH_ADDR}" > functions/eem.usb0/dev_addr
>>> echo "${HOST_ETH_ADDR}" > functions/eem.usb0/host_addr
>>> ln -s functions/eem.usb0 configs/c.1/
>>>
>>> # Mass Storage device
>>> mkdir functions/mass_storage.usb0
>>> echo 1 > functions/mass_storage.usb0/stall
>>> echo 0 > functions/mass_storage.usb0/lun.0/cdrom
>>> echo 0 > functions/mass_storage.usb0/lun.0/ro
>>> echo 0 > functions/mass_storage.usb0/lun.0/nofua
>>> echo "${USBDISK}" > functions/mass_storage.usb0/lun.0/file
>>> ln -s functions/mass_storage.usb0 configs/c.1/
>>>
>>> # UAC2 device
>>> mkdir functions/uac2.usb0
>>> ln -s functions/uac2.usb0 configs/c.1
>>> ....
>>>
>>
>> As you say, could perhaps the reason be that the extra EP-IN added in
>> those patches (previously 1, now 2 with the default config you use)
>> exceeds your EP-IN max count or available fifos somehow?  You have a
>> number of functions initialized. If you change the load order of the
>> functions, do you get the error later with a different function? Just
>> guessing...
>>
>> You should be able to switch the default async EP-OUT (which configures
>> the new feedback EP-IN ) to adaptive EP-OUT (which requires no feedback
>> EP) with c_sync=8 parameter of f_uac2.
>>
>> https://urldefense.com/v3/__https://elixir.bootlin.com/linux/v5.14-rc6/source/drivers/usb/gadget/function/f_uac2.c*L47__;Iw!!A4F2R9G_pg!PZHOWnH3HDs-9a9bz4KLDShZpsubSfG84fu3wEZyK4Q_Wvv2lhHKuk7LJpWPAHQ6Lj4y$
>>
>> https://urldefense.com/v3/__https://elixir.bootlin.com/linux/v5.14-rc6/source/drivers/usb/gadget/function/f_uac2.c*L830__;Iw!!A4F2R9G_pg!PZHOWnH3HDs-9a9bz4KLDShZpsubSfG84fu3wEZyK4Q_Wvv2lhHKuk7LJpWPAC7mfgo7$
>>
>> https://urldefense.com/v3/__https://elixir.bootlin.com/linux/v5.14-rc6/source/include/uapi/linux/usb/ch9.h*L453__;Iw!!A4F2R9G_pg!PZHOWnH3HDs-9a9bz4KLDShZpsubSfG84fu3wEZyK4Q_Wvv2lhHKuk7LJpWPANdeuGIx$
>>
>> Does that fix the problem?
>>
> 
> Hi Pavel,
> 
> I took a look at 24f779dac8f3 ("usb: gadget: f_uac2/u_audio: add
> feedback endpoint support") that Ferry reported the issue from
> bisection. I see at least a couple problems in the new UAC2 changes.
> 
> 1) usb_ep_dequeue() is asynchronous. Don't free requests before the
> controller driver give them back.
> 
> 2) Did you test with SuperSpeed? I don't see companion descriptor.
> 
> Please fix them.

Given it's late in the cycle I agree with Andy it would be best to 
revert the series now.

I will be happy to test on dwc3 when a fixed series arrives.

> Thanks,
> Thinh
>