[Bug 1388239] Re: 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]()

Wed Nov 19 19:20:28 UTC 2014

PascalC, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect -p linux 1388239

** No longer affects: ubuntu-release-upgrader (Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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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:
  Incomplete
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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