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[23.128.96.18]) by mx.google.com with ESMTP id z2si4077828jaj.101.2021.08.19.14.06.10; Thu, 19 Aug 2021 14:06:23 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=fail header.i=@ivitera.com header.s=mail header.b=MomDlB0d; dkim=fail header.i=@ivitera.com header.s=mail header.b=Zu0uSIdJ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233309AbhHSVFn (ORCPT + 99 others); Thu, 19 Aug 2021 17:05:43 -0400 Received: from cable.insite.cz ([84.242.75.189]:43845 "EHLO cable.insite.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231134AbhHSVFm (ORCPT ); Thu, 19 Aug 2021 17:05:42 -0400 Received: from localhost (localhost [127.0.0.1]) by cable.insite.cz (Postfix) with ESMTP id E06ECA1A3D403; Thu, 19 Aug 2021 23:05:03 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=ivitera.com; s=mail; t=1629407103; bh=MOi+JOuzaOcxUx82njAVB+nFXgmx5ofDM23e/tASFPw=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=MomDlB0dRjarqqnRIvw2edOpSdPp4dtjTCbvTumSkTnhTdshzN0rDZWlGILDe9Xq9 tbFWk7N8ndPvbDo0b8eyDHz+0Er5rMCzfmHhlm/e8+7XXNEwBbKX3qzOf3RNA9nvPT 8dTgIHRomKgILaup01LcTUNgCxmaF59E9nIKcGEQ= Received: from cable.insite.cz ([84.242.75.189]) by localhost (server.insite.cz [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id s-XzAIOsr7aa; Thu, 19 Aug 2021 23:04:56 +0200 (CEST) Received: from [192.168.105.119] (ip28.insite.cz [81.0.237.28]) (Authenticated sender: pavel) by cable.insite.cz (Postfix) with ESMTPSA id 9447AA1A3D401; Thu, 19 Aug 2021 23:04:55 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=ivitera.com; s=mail; t=1629407096; bh=MOi+JOuzaOcxUx82njAVB+nFXgmx5ofDM23e/tASFPw=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=Zu0uSIdJShGT83W4kgS8NBPaokJ9GWNl3gY5ky0/ibctrXNS1alzS3Do7rzwsoz9W aUE7yTWoE6xksJXRttbDX3Ps45bDZaryjUjbaeZmK4uJT2i9WVW9SU0vhIImSFm9OT A3Dti+aG/1ksRWs+JZ0f6Tu2MKmdmBGIhAIUt64M= Subject: Re: [PATCH v10 0/6] Re-introduce TX FIFO resize for larger EP bursting To: Ferry Toth , Felipe Balbi Cc: Wesley Cheng , gregkh@linuxfoundation.org, robh+dt@kernel.org, agross@kernel.org, bjorn.andersson@linaro.org, frowand.list@gmail.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, jackp@codeaurora.org, heikki.krogerus@linux.intel.com, andy.shevchenko@gmail.com, Ruslan Bilovol References: <1623923899-16759-1-git-send-email-wcheng@codeaurora.org> <2e01c435-9ecc-4e3b-f55c-612a86667020@codeaurora.org> <2ae9fa6a-3bb1-3742-0dd3-59678bdd8643@gmail.com> <87v951ldlt.fsf@kernel.org> <87pmv9l1dv.fsf@kernel.org> <9dc6cd83-17b9-7075-0934-6b9d41b6875d@gmail.com> <87a6mbudvc.fsf@kernel.org> <6e8bb4ad-fe68-ad36-7416-2b8e10b6ae96@gmail.com> <877dhev68a.fsf@kernel.org> <874kchvcq0.fsf@kernel.org> <8735raj766.fsf@kernel.org> From: Pavel Hofman Message-ID: Date: Thu, 19 Aug 2021 23:04:50 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 writes: >>>>>>> Ferry Toth writes: >>>>>>>>>>> Ferry Toth 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://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 >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> 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://elixir.bootlin.com/linux/v5.14-rc6/source/drivers/usb/gadget/function/f_uac2.c#L47 https://elixir.bootlin.com/linux/v5.14-rc6/source/drivers/usb/gadget/function/f_uac2.c#L830 https://elixir.bootlin.com/linux/v5.14-rc6/source/include/uapi/linux/usb/ch9.h#L453 Does that fix the problem? Thanks, Pavel.