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([2001:981:6fec:1:45ee:ea7e:25d:919a]) by smtp.gmail.com with ESMTPSA id h19sm1635184edt.87.2021.08.17.15.00.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 17 Aug 2021 15:00:16 -0700 (PDT) Subject: Re: [PATCH v10 0/6] Re-introduce TX FIFO resize for larger EP bursting To: 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: Ferry Toth Message-ID: Date: Wed, 18 Aug 2021 00:00:15 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <8735raj766.fsf@kernel.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 5.14.0-rc5 the problem seems worse (or different?), and just >> disabling uac2 gadget does not prevent the crash. Even disabling gser >> and mass_storage.usb0 as well there is still a crash. >> >> Now I'm not sure how to proceed. Bisect rc1? Or focus on rc5 (rc6?)? > I'd first bisect between 5.13 and v5.14-rc1. Once you find the offending > commit, verify if reverting that on -rc1 works, then verify if reverting > on -rc5 also works :-) >