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From: Peter Chen <peter.chen@nxp.com>
To: "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>
Cc: "laurent.pinchart@ideasonboard.com"  <laurent.pinchart@ideasonboard.com>
Subject: strange call stack when running uvc-gadget application
Date: Mon, 2 Nov 2020 09:50:05 +0000
Message-ID: <20201102094936.GA29581@b29397-desktop> (raw)

Hi all,

When running run uvc-gadget application at HS using dwc3 gadget at Linux
v5.10-rc1, the video stream will be stopped after 1-2 minutes running. The
trace log like below, I wonder how _raw_spin_lock_irqsave calls __switch_to?
Any hints? Thanks.

usb_test# [ 4757.322728] configfs-gadget gadget: uvc: VS request completed with status -18.
[ 4757.329971] configfs-gadget gadget: uvc: VS request completed with status -18.
UVC: Possible USB shutdown requested from Host, seen during VIDIOC_DQBUF

usb_test# [ 4812.376465] check_interval: 37 callbacks suppressed
[ 4825.307665] configfs-gadget gadget: uvc: VS request completed with status -18.
[ 4825.314912] configfs-gadget gadget: uvc: VS request completed with status -18.
UVC: Possible USB shutdown requested from Host, seen during VIDIOC_DQBUF
[ 4826.231392] check_interval: 3 callbacks suppressed
select timeout
[ 4827.336088] dwc3 38100000.dwc3: request 0000000080ebefd3 was not queued to ep2in
[ 4827.343547] dwc3 38100000.dwc3: request 00000000b578605c was not queued to ep2in
[ 4827.350989] dwc3 38100000.dwc3: request 00000000c6d191cd was not queued to ep2in
[ 4827.358422] dwc3 38100000.dwc3: request 0000000085205409 was not queued to ep2in
UVC: Stopping video stream.

[ 4848.381718] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 4848.387824] rcu:     3-...0: (1 GPs behind) idle=162/1/0x4000000000000000 softirq=10819/10819 fqs=2356
[ 4848.396956]  (detected by 2, t=5252 jiffies, g=20129, q=3770)
[ 4848.396959] Task dump for CPU 3:
[ 4848.405925] task:uvc-gadget_wlhe state:R  running task     stack:    0 pid:  674 ppid:   636 flags:0x00000202
[ 4848.415842] Call trace:
[ 4848.418294]  __switch_to+0xc0/0x170
[ 4848.421785]  _raw_spin_lock_irqsave+0x84/0xb0
[ 4848.426143]  composite_disconnect+0x28/0x78
[ 4848.430327]  configfs_composite_disconnect+0x68/0x70
[ 4848.435290]  usb_gadget_disconnect+0x10c/0x128
[ 4848.439733]  usb_gadget_deactivate+0xd4/0x108
[ 4848.444089]  usb_function_deactivate+0x6c/0x80
[ 4848.448534]  uvc_function_disconnect+0x20/0x58
[ 4848.452976]  uvc_v4l2_release+0x30/0x88
[ 4848.456812]  v4l2_release+0xbc/0xf0
[ 4848.460301]  __fput+0x7c/0x230
[ 4848.463353]  ____fput+0x14/0x20
[ 4848.466495]  task_work_run+0x88/0x140
[ 4848.470157]  do_notify_resume+0x240/0x6f0
[ 4848.474166]  work_pending+0x8/0x200

-- 

Thanks,
Peter Chen

             reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-02  9:50 Peter Chen [this message]
2020-11-03  6:20 ` Sriharsha Allenki
2020-11-04 10:05   ` Peter Chen
2020-11-05  5:29     ` Sriharsha Allenki

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