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? -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to v4l-utils in Ubuntu. https://bugs.launchpad.net/bugs/1388239 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1388239/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
