Hi,

Ferry Toth [off-list ref] writes:

quoted

quoted

kernel: configfs-gadget gadget: u_audio_start_playback:451 Error!
kernel: configfs-gadget gadget: u_audio_start_playback:451 Error!
kernel: dwc3 dwc3.0.auto: request 00000000fbc71244 was not queued to ep5in
kernel: dwc3 dwc3.0.auto: request 00000000ad1b8c18 was not queued to ep5in
kernel: dwc3 dwc3.0.auto: Fifosize(2154) > RAM size(2022) ep5in
depth:115540359
kernel: configfs-gadget gadget: u_audio_start_playback:451 Error!
kernel: configfs-gadget gadget: u_audio_start_playback:451 Error!
kernel: dwc3 dwc3.0.auto: request 000000003c32dcc5 was not queued to ep5in
kernel: dwc3 dwc3.0.auto: request 00000000b2512aa9 was not queued to ep5in

Removing uac2 from the config makes the call trace go away, but the R/W
speed does not change.

I am testing with 5.14.0-rc2 and now related error appears (not in rc1). 
Disabling uac2 solves it still. Any idea what it could be?

BUG: unable to handle page fault for address: 0000000500000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 0 P4D 0
Oops: 0010 [#1] SMP PTI
CPU: 0 PID: 494 Comm: irq/14-dwc3 Not tainted 
5.14.0-rc2-edison-acpi-standard #1

(cool that you're running on ACPI heh)

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/0x70
  ? 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.

-- 
balbi