Hi,
When I unplug a uvc camera *while streaming* I get:
Jun 9 13:20:02 shalem kernel: [15824.809741] BUG: unable to handle kernel NULL pointer dereference at (null)
Jun 9 13:20:02 shalem kernel: [15824.809816] IP: [<ffffffffa0309eae>] media_entity_put+0x12/0x2c [media]
Jun 9 13:20:02 shalem kernel: [15824.809877] PGD 0
Jun 9 13:20:02 shalem kernel: [15824.809898] Oops: 0000 [#1] SMP
Jun 9 13:20:02 shalem kernel: [15824.809933] CPU 1
Jun 9 13:20:02 shalem kernel: [15824.809952] Modules linked in: uvcvideo videodev media v4l2_compat_ioctl32 nf_conntrack_ipv4 nf_defrag_ipv4 vfat fat tcp_lp tun fuse ebtable_nat ebtables cpufreq_ondemand acpi_cpufreq freq_table mperf bridge stp llc be2iscsi iscsi_boot_sysfs bnx2i cnic uio cxgb3i libcxgbi iw_cxgb3 cxgb3 mdio ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip6t_REJECT nf_conntrack_ipv6 coretemp xt_physdev nf_defrag_ipv6 ip6table_filter xt_state ip6_tables nf_conntrack snd_hda_codec_hdmi snd_hda_codec_conexant
snd_hda_intel snd_hda_codec snd_bt87x usb_storage snd_seq snd_usb_audio uas snd_pcm snd_hwdep snd_usbmidi_lib ppdev snd_rawmidi microcode e1000e snd_seq_device serio_raw i2c_i801 snd_timer tpm_infineon snd iTCO_wdt parport_pc parport soundcore mei(C) iTCO_vendor_support snd_page_alloc virtio_net kvm_intel kvm ipv6 i915 drm_kms_helper drm i2c_algo_bit i2c_core video [last unloaded: tuner_types]
Jun 9 13:20:02 shalem kernel: [15824.810794]
Jun 9 13:20:02 shalem kernel: [15824.810811] Pid: 4944, comm: camorama Tainted: G C 3.0.0-rc1+ #5 FUJITSU D3071-S1/D3071-S1
Jun 9 13:20:02 shalem kernel: [15824.810888] RIP: 0010:[<ffffffffa0309eae>] [<ffffffffa0309eae>] media_entity_put+0x12/0x2c [media]
Jun 9 13:20:02 shalem kernel: [15824.810961] RSP: 0018:ffff88011da23d98 EFLAGS: 00010286
Jun 9 13:20:02 shalem kernel: [15824.811003] RAX: 0000000000000000 RBX: ffff88006a864400 RCX: 0000000000000118
Jun 9 13:20:02 shalem kernel: [15824.811057] RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88006a864400
Jun 9 13:20:02 shalem kernel: [15824.811112] RBP: ffff88011da23d98 R08: ffffea0002896e28 R09: ffff88011da23d38
Jun 9 13:20:02 shalem kernel: [15824.811165] R10: ffffffffa0526026 R11: ffffffff81a58210 R12: ffff880027d43840
Jun 9 13:20:02 shalem kernel: [15824.811219] R13: 0000000000000008 R14: ffff880133310dc0 R15: ffff88012db76300
Jun 9 13:20:02 shalem kernel: [15824.811274] FS: 00007f7942ff49c0(0000) GS:ffff88013e280000(0000) knlGS:0000000000000000
Jun 9 13:20:02 shalem kernel: [15824.811336] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jun 9 13:20:02 shalem kernel: [15824.811381] CR2: 0000000000000000 CR3: 0000000001a03000 CR4: 00000000000406e0
Jun 9 13:20:02 shalem kernel: [15824.811435] DR0: 0000000000000003 DR1: 00000000000000b0 DR2: 0000000000000001
Jun 9 13:20:02 shalem kernel: [15824.811491] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Jun 9 13:20:02 shalem kernel: [15824.811546] Process camorama (pid: 4944, threadinfo ffff88011da22000, task ffff880113618000)
Jun 9 13:20:02 shalem kernel: [15824.811609] Stack:
Jun 9 13:20:02 shalem kernel: [15824.811629] ffff88011da23db8 ffffffffa0510203 ffff880027d43840 ffff880133310dc0
Jun 9 13:20:02 shalem kernel: [15824.811695] ffff88011da23e08 ffffffff811233fe ffff880027d43850 ffff880134530500
Jun 9 13:20:02 shalem kernel: [15824.811763] ffffffff811e3397 ffff880027d43840 ffff8801347a5b80 0000000000000000
Jun 9 13:20:02 shalem kernel: [15824.811829] Call Trace:
Jun 9 13:20:02 shalem kernel: [15824.811856] [<ffffffffa0510203>] v4l2_release+0x7b/0x8e [videodev]
Jun 9 13:20:02 shalem kernel: [15824.811910] [<ffffffff811233fe>] fput+0x121/0x1e3
Jun 9 13:20:02 shalem kernel: [15824.811953] [<ffffffff811e3397>] ? exit_sem+0x1c7/0x1d8
Jun 9 13:20:02 shalem kernel: [15824.811998] [<ffffffff811208a7>] filp_close+0x6e/0x7a
Jun 9 13:20:02 shalem kernel: [15824.812041] [<ffffffff81131b33>] ? __d_free+0x53/0x58
Jun 9 13:20:02 shalem kernel: [15824.812084] [<ffffffff810567e1>] put_files_struct+0x6e/0xd5
Jun 9 13:20:02 shalem kernel: [15824.812130] [<ffffffff810568d5>] exit_files+0x41/0x46
Jun 9 13:20:02 shalem kernel: [15824.812172] [<ffffffff81056e55>] do_exit+0x2aa/0x738
Jun 9 13:20:02 shalem kernel: [15824.812214] [<ffffffff8104be73>] ? wake_up_state+0x10/0x12
Jun 9 13:20:02 shalem kernel: [15824.812259] [<ffffffff81062ba2>] ? signal_wake_up+0x32/0x43
Jun 9 13:20:02 shalem kernel: [15824.812304] [<ffffffff810638b4>] ? zap_other_threads+0x59/0x82
Jun 9 13:20:02 shalem kernel: [15824.812352] [<ffffffff81057568>] do_group_exit+0x7a/0xa2
Jun 9 13:20:02 shalem kernel: [15824.812395] [<ffffffff810575a7>] sys_exit_group+0x17/0x17
Jun 9 13:20:02 shalem kernel: [15824.812440] [<ffffffff81487802>] system_call_fastpath+0x16/0x1b
Jun 9 13:20:02 shalem kernel: [15824.812486] Code: 10 66 41 ff 44 24 40 48 83 c4 18 44 89 f0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 55 48 89 e5 66 66 66 66 90 48 85 ff 74 1c 48 8b 47 10
Jun 9 13:20:02 shalem kernel: [15824.812783] RIP [<ffffffffa0309eae>] media_entity_put+0x12/0x2c [media]
Jun 9 13:20:02 shalem kernel: [15824.812839] RSP <ffff88011da23d98>
Jun 9 13:20:02 shalem kernel: [15824.812867] CR2: 0000000000000000
Jun 9 13:20:02 shalem kernel: [15824.873494] ---[ end trace bfc278787db8cbfb ]---
Jun 9 13:20:02 shalem kernel: [15824.873496] Fixing recursive fault but reboot is needed!
I've not tested if this also impacts 3.0!!
I also get the following during building linuxtv/staging/for_v3.1:
CC [M] drivers/media/video/uvc/uvc_entity.o
drivers/media/video/uvc/uvc_entity.c: In function ‘uvc_mc_register_entities’:
drivers/media/video/uvc/uvc_entity.c:110:6: warning: ‘ret’ may be used uninitialized in this function [-Wuninitialized]
Regards,
Hans
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