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@xxxxxxxxx> writes:
Ferry Toth <fntoth@xxxxxxxxx> writes:
Ferry Toth <fntoth@xxxxxxxxx> 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
<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?
u_audio_stop_capture calls free_ep_fback
https://elixir.bootlin.com/linux/v5.14-rc6/source/drivers/usb/gadget/function/u_audio.c#L414
which clears the feedback request prm->req_fback.
Then (reading from your the call trace), usb_ep_disable calls
dwc3_gadget_ep_disable which for every request in the EP calls
dwc3_remove_requests which gives every found request back to the gadget
function, IIUC by calling the complete method of the request
https://elixir.bootlin.com/linux/v5.14-rc6/source/drivers/usb/gadget/udc/core.c#L912
. Perhaps the problem is somewhere here?
The dwc2 gadget has its endpoint_disable method a bit different
https://elixir.bootlin.com/linux/v5.14-rc6/source/drivers/usb/dwc2/gadget.c#L4200
->
https://elixir.bootlin.com/linux/v5.14-rc6/source/drivers/usb/dwc2/gadget.c#L3251
->
https://elixir.bootlin.com/linux/v5.14-rc6/source/drivers/usb/dwc2/gadget.c#L2090
which also calls usb_gadget_giveback_request
https://elixir.bootlin.com/linux/v5.14-rc6/source/drivers/usb/dwc2/gadget.c#L2126
. Perhaps there is some minor but important difference in processing the
requests when disabling the endpoint between dwc2 and dwc3?
Thanks,
Pavel.
