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[Serhiy Zahoriya <1388239@xxxxxxxxxxxxxxxxxx>]

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/media/v4l2-core/videobuf2-core.c?id=refs/tags/v3.18-rc5#n2135

> __vb2_queue_cancel() - cancel and stop (pause) streaming
> Removes all queued buffers from driver's queue and all buffers queued by
> userspace from videobuf's queue. Returns to state after reqbufs.

Why does it want to stop  streaming in the first place?

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Title:
  CPU: 1 PID: 11025 at
  /build/buildd/linux-3.16.0/drivers/media/v4l2-core/videobuf2-core.c:2120
  __vb2_queue_cancel+0x116/0x180 [videobuf2_core]()

Status in “linux” package in Ubuntu:
  Confirmed
Status in “ubuntu-release-upgrader” package in Ubuntu:
  Invalid
Status in “v4l-utils” package in Ubuntu:
  New

Bug description:
  Found theses warnings when using the webcam on flash site under
  firefox.

  
  [418114.773634] ------------[ cut here ]------------
  [418114.773674] WARNING: CPU: 1 PID: 11025 at /build/buildd/linux-3.16.0/drivers/media/v4l2-core/videobuf2-core.c:2120 __vb2_queue_cancel+0x116/0x180 [videobuf2_core]()
  [418114.773677] Modules linked in: btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c xt_CHECKSUM iptable_mangle ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc snd_hrtimer nfsv3 rpcsec_gss_krb5 nfsv4 ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr bnep iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi rfcomm bluetooth 6lowpan_iphc nfsd auth_rpcgss binfmt_misc nfs_acl nfs lockd sunrpc fscache dm_crypt ir_lirc_codec lirc_dev ir_rc5_decoder ir_mce_kbd_decoder ir_sharp_decoder ir_jvc_decoder ir_sony_decoder ir_sanyo_decoder ir_rc6_decoder ir_nec_decoder rc_rc6_mce mceusb rc_core pl2303 usbserial snd_hda_codec_realtek uvcvideo videobuf2_vmalloc
  [418114.773763]  videobuf2_memops snd_hda_codec_generic snd_usb_audio videobuf2_core v4l2_common snd_hda_intel videodev snd_hda_controller media joydev snd_usbmidi_lib snd_hda_codec snd_hwdep coretemp snd_pcm kvm_intel snd_seq_midi dm_multipath kvm snd_seq_midi_event scsi_dh snd_rawmidi snd_seq snd_seq_device serio_raw snd_timer cuse snd lpc_ich parport_pc soundcore ppdev mac_hid lp parport i915 hid_generic e1000e ptp video i2c_algo_bit drm_kms_helper usbhid drm firewire_ohci hid pata_acpi firewire_core crc_itu_t pps_core
  [418114.773829] CPU: 1 PID: 11025 Comm: plugin-containe Tainted: G        W     3.16.0-23-lowlatency #31-Ubuntu
  [418114.773833] Hardware name: AOpen i965GMx-IF/i965GMx-IF, BIOS 6.00 PG 10/03/2008
  [418114.773836]  0000000000000009 ffff8800115c7c00 ffffffff8177ec5d 0000000000000000
  [418114.773843]  ffff8800115c7c38 ffffffff8107183d 0000000000000000 0000000000000000
  [418114.773848]  ffff88008b044af0 ffff88008b0448d8 ffff8801215cb180 ffff8800115c7c48
  [418114.773854] Call Trace:
  [418114.773867]  [<ffffffff8177ec5d>] dump_stack+0x4d/0x6f
  [418114.773875]  [<ffffffff8107183d>] warn_slowpath_common+0x7d/0xa0
  [418114.773881]  [<ffffffff8107191a>] warn_slowpath_null+0x1a/0x20
  [418114.773893]  [<ffffffffc0701596>] __vb2_queue_cancel+0x116/0x180 [videobuf2_core]
  [418114.773905]  [<ffffffffc0702cf5>] vb2_internal_streamoff+0x35/0x90 [videobuf2_core]
  [418114.773916]  [<ffffffffc0702db5>] vb2_streamoff+0x65/0x70 [videobuf2_core]
  [418114.773928]  [<ffffffffc075e855>] uvc_queue_enable+0x65/0xa0 [uvcvideo]
  [418114.773939]  [<ffffffffc076360a>] uvc_video_enable+0x4a/0x1b0 [uvcvideo]
  [418114.773958]  [<ffffffffc07601e2>] uvc_v4l2_do_ioctl+0x962/0x14b0 [uvcvideo]
  [418114.773962]  [<ffffffff81192373>] ? copy_page_from_iter_iovec+0x183/0x2d0
  [418114.773976]  [<ffffffffc06e02c6>] video_usercopy+0x366/0x600 [videodev]
  [418114.773979]  [<ffffffff811e4bd9>] ? __sb_start_write+0x49/0xf0
  [418114.773985]  [<ffffffffc075f880>] ? uvc_v4l2_open+0x150/0x150 [uvcvideo]
  [418114.773988]  [<ffffffff811e4b61>] ? __sb_end_write+0x31/0x60
  [418114.773992]  [<ffffffff811eaad3>] ? pipe_write+0x393/0x450
  [418114.773997]  [<ffffffffc075ec3f>] uvc_v4l2_ioctl+0x2f/0x70 [uvcvideo]
  [418114.774004]  [<ffffffffc06da734>] v4l2_ioctl+0x154/0x190 [videodev]
  [418114.774008]  [<ffffffff811f6468>] do_vfs_ioctl+0x2c8/0x4a0
  [418114.774011]  [<ffffffff812007de>] ? __fget+0x6e/0xb0
  [418114.774029]  [<ffffffff811f66c1>] SyS_ioctl+0x81/0xa0
  [418114.774039]  [<ffffffff8178666d>] system_call_fastpath+0x1a/0x1f
  [418114.774084] ---[ end trace 36d13fa659268ece ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: ubuntu-release-upgrader-core 1:14.10.9
  ProcVersionSignature: Ubuntu 3.16.0-23.31-lowlatency 3.16.4
  Uname: Linux 3.16.0-23-lowlatency x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Fri Oct 31 20:35:55 2014
  InstallationDate: Installed on 2011-10-23 (1103 days ago)
  InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to utopic on 2014-10-24 (7 days ago)

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