On Sun, 2015-01-18 at 11:40 +0100, Hans Verkuil wrote: > On 01/18/2015 09:54 AM, Jurgen Kramer wrote: > > I have been running the original code (because of issues with the patch) > > for a while with some added printks. This morning I found this NULL > > pointer derefence: > > That's what my patch fixes, so that's no surprise that you get this. > > I don't understand why you have issues with the patch, very weird. I just retested with your patch using mplayer instead of mythtv. It played for a few seconds then it froze and the mplayer process is not killable. Can you sent my your version of patched videobuf2-core.c? I had to hand patch (patch did not apply cleanly). Maybe I botched something. Regards, Jurgen > Regards, > > Hans > > > > > [47772.121968] DEBUG: vb2_thread_stop entered > > [47772.122014] BUG: unable to handle kernel NULL pointer dereference at > > (null) > > [47772.122042] vb2: counters for queue ffff880407ee9828: UNBALANCED! > > [47772.122043] vb2: setup: 1 start_streaming: 1 stop_streaming: 1 > > [47772.122043] vb2: wait_prepare: 249333 wait_finish: 249334 > > [47772.122083] IP: [<ffffffffa057b65c>] cx23885_buf_prepare+0x6c/0xd0 > > [cx23885] > > [47772.122102] PGD 0 > > [47772.122107] Oops: 0000 [#1] SMP > > [47772.122116] Modules linked in: cfg80211 rfkill > > nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT > > xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter > > ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 > > ip6table_mangle ip6table_security ip6table_raw ip6table_filter > > ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 > > nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw sp2(OE) > > si2157(OE) si2168(OE) i2c_mux cx25840(OE) cx23885(OE) altera_ci(OE) > > tda18271(OE) altera_stapl(OE) videobuf2_dvb(OE) videobuf2_core(OE) > > videobuf2_dma_sg(OE) videobuf2_memops(OE) snd_seq snd_seq_device snd_pcm > > snd_timer snd soundcore tveeprom(OE) cx2341x(OE) dvb_core(OE) > > rc_core(OE) v4l2_common(OE) videodev(OE) raid456 async_raid6_recov > > async_memcpy > > [47772.122321] async_pq async_xor xor async_tx raid6_pq media(OE) > > mxm_wmi intel_rapl x86_pkg_temp_thermal coretemp kvm_intel kvm serio_raw > > shpchp mei_me mei i2c_i801 crct10dif_pclmul crc32_pclmul crc32c_intel > > ghash_clmulni_intel microcode dw_dmac wmi dw_dmac_core tpm_tis tpm > > i2c_hid i2c_designware_platform i2c_designware_core acpi_pad nfsd > > auth_rpcgss nfs_acl lockd sunrpc e1000e i915 ptp pps_core i2c_algo_bit > > drm_kms_helper drm sdhci_acpi sdhci mmc_core video > > [47772.122472] CPU: 0 PID: 6151 Comm: vb2-cx23885[2] Tainted: G > > OE 3.17.8-200.fc20.x86_64 #1 > > [47772.122492] Hardware name: To Be Filled By O.E.M. To Be Filled By > > O.E.M./Z97 Extreme4, BIOS P1.50 12/17/2014 > > [47772.122523] task: ffff8803dcfc9d70 ti: ffff8803652a8000 task.ti: > > ffff8803652a8000 > > [47772.122549] RIP: 0010:[<ffffffffa057b65c>] [<ffffffffa057b65c>] > > cx23885_buf_prepare+0x6c/0xd0 [cx23885] > > [47772.122573] RSP: 0018:ffff8803652abdc8 EFLAGS: 00010246 > > [47772.122585] RAX: 0000000000005e00 RBX: ffff880036a6d600 RCX: > > 00000000000002f0 > > [47772.122609] RDX: 0000000000005e00 RSI: ffff88040608a3b8 RDI: > > ffff8804091f3000 > > [47772.122624] RBP: ffff8803652abdf0 R08: 0000000000000020 R09: > > 0000000000000000 > > [47772.122649] R10: ffff880407ee9828 R11: ffff880407ee9828 R12: > > ffff88040608a000 > > [47772.122663] R13: 0000000000005e00 R14: ffff880036a6c000 R15: > > 0000000000000000 > > [47772.122677] FS: 0000000000000000(0000) GS:ffff88041fa00000(0000) > > knlGS:0000000000000000 > > [47772.122693] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > [47772.122705] CR2: 0000000000000000 CR3: 0000000001c14000 CR4: > > 00000000001407f0 > > [47772.122720] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > > 0000000000000000 > > [47772.123643] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: > > 0000000000000400 > > [47772.124605] Stack: > > [47772.125468] ffff88040608a000 ffff88040608c458 ffff88040608a000 > > 0000000000000000 > > [47772.126350] ffff880407ee9828 ffff8803652abe00 ffffffffa057cd69 > > ffff8803652abe30 > > [47772.127230] ffffffffa04f183e 0000000000005e00 ffff880407ee9828 > > ffff88040608c458 > > [47772.128129] Call Trace: > > [47772.129002] [<ffffffffa057cd69>] buffer_prepare+0x19/0x20 [cx23885] > > [47772.129916] [<ffffffffa04f183e>] __buf_prepare+0x27e/0x390 > > [videobuf2_core] > > [47772.130838] [<ffffffffa04f301b>] vb2_internal_qbuf+0x6b/0x210 > > [videobuf2_core] > > [47772.131722] [<ffffffffa04f32f6>] vb2_thread+0x136/0x4d0 > > [videobuf2_core] > > [47772.132642] [<ffffffffa04f31c0>] ? vb2_internal_qbuf+0x210/0x210 > > [videobuf2_core] > > [47772.133527] [<ffffffff810b04b8>] kthread+0xd8/0xf0 > > [47772.134400] [<ffffffff810b03e0>] ? kthread_create_on_node > > +0x190/0x190 > > [47772.135268] [<ffffffff8173057c>] ret_from_fork+0x7c/0xb0 > > [47772.136134] [<ffffffff810b03e0>] ? kthread_create_on_node > > +0x190/0x190 > > [47772.137058] Code: 24 60 02 00 00 85 c0 75 3e 45 85 ed 75 4d 90 8b 8b > > f0 00 00 00 49 8b be 20 01 00 00 49 8d b4 24 b8 03 00 00 44 8b 83 f4 00 > > 00 00 <49> 8b 17 45 31 c9 e8 c9 f0 ff ff 31 c0 5b 41 5c 41 5d 41 5e 41 > > [47772.138917] RIP [<ffffffffa057b65c>] cx23885_buf_prepare+0x6c/0xd0 > > [cx23885] > > [47772.139841] RSP <ffff8803652abdc8> > > [47772.140776] CR2: 0000000000000000 > > [47772.146080] ---[ end trace 2c986045fea9fe0a ]--- > > [47772.146236] DEBUG: vb2_thread_stop quit > > > > This happened only once normally it just prints: > > [47179.170117] DEBUG: vb2_thread > > [47400.670021] DEBUG: vb2_thread_stop entered > > [47400.670105] DEBUG: vb2_thread_stop quit > > [47401.012711] DEBUG: vb2_thread > > [47456.200792] DEBUG: vb2_thread_stop entered > > [47456.200908] DEBUG: vb2_thread_stop quit > > [47456.544154] DEBUG: vb2_thread > > [47480.938606] DEBUG: vb2_thread_stop entered > > [47480.938711] DEBUG: vb2_thread_stop quit > > [47481.024019] DEBUG: vb2_thread > > [47708.823051] DEBUG: vb2_thread_stop entered > > [47708.823184] DEBUG: vb2_thread_stop quit > > [47709.166499] DEBUG: vb2_thread > > > > Regards, > > Jurgen > > > -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
