[mythtv-users] Backend crash (may be caused by ivtv)

voidtrance at comcast.net voidtrance at comcast.net
Thu Oct 8 20:06:12 UTC 2009


Last night, while recording two shows off of HDHR tuners and watching an already recorded 
show, my backend crashed. The crashed happend right at the end of the the show that I was 
watching (but this could have been just a coincidence. 
Looking at the log, the crash might have happened at the end of a recording. This is what the 
message log had to say about the crash: 

Oct 8 00:15:20 mythtv kernel: mythbackend[2519]: segfault at 0 ip 0000003cca847dc6 sp 00007fff57259f88 error 6 in libqt-mt.so.3.3.8[3cca200000+884000] 

Interestingly, 7 hours earlier there was a kernel backtrace in the log: 

Oct 7 17:31:23 mythtv kernel: ------------[ cut here ]------------ 
Oct 7 17:31:23 mythtv kernel: kernel BUG at fs/buffer.c:3258! 
Oct 7 17:31:23 mythtv kernel: invalid opcode: 0000 [1] SMP 
Oct 7 17:31:23 mythtv kernel: CPU 0 
Oct 7 17:31:23 mythtv kernel: Modules linked in: fuse autofs4 sunrpc ipv6 tuner_simple tuner_types msp3400 saa7115 tuner snd_intel8x0 snd_ac97_codec ac97_bus snd 
_seq_dummy ivtv snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device compat_ioctl32 snd_pcm_oss videodev nvidia(P) snd_mixer_oss snd_pcm v4l1_compat i2c_algo_bit 
cx2341x v4l2_common k8temp firewire_ohci hwmon snd_timer i2c_nforce2 firewire_core crc_itu_t snd soundcore sata_nv floppy ppdev forcedeth tveeprom i2c_core snd_p 
age_alloc pcspkr shpchp lirc_mceusb lirc_dev parport_pc serio_raw parport joydev ata_generic pata_acpi pata_amd [last unloaded: scsi_wait_scan] 
Oct 7 17:31:23 mythtv kernel: Pid: 266, comm: kswapd0 Tainted: P 2.6.27.30-170.2.82.fc10.x86_64 #1 MS-7125 
Oct 7 17:31:23 mythtv kernel: RIP: 0010:[<ffffffff810e16ea>] [<ffffffff810e16ea>] free_buffer_head+0x11/0x3e 
Oct 7 17:31:23 mythtv kernel: RSP: 0000:ffff88007d4039e0 EFLAGS: 00010206 
Oct 7 17:31:23 mythtv kernel: RAX: ffff8800311b63c8 RBX: ffff8800311b6380 RCX: ffffe20000745350 
Oct 7 17:31:23 mythtv kernel: RDX: ffff8800311b6380 RSI: 0000000000001000 RDI: ffff8800311b6380 
Oct 7 17:31:23 mythtv kernel: RBP: ffff88007d4039e0 R08: 0000000000000001 R09: 0000000000000000 
Oct 7 17:31:23 mythtv kernel: R10: ffff88007d403a00 R11: ffffffff810e16fd R12: 0000000000000001 
Oct 7 17:31:23 mythtv kernel: R13: ffff8800194cdcd8 R14: ffff880074fc5400 R15: 00000000000000d0 
Oct 7 17:31:23 mythtv kernel: FS: 00007f85f2179790(0000) GS:ffffffff81719000(0000) knlGS:0000000000000000 
Oct 7 17:31:23 mythtv kernel: CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b 
Oct 7 17:31:23 mythtv kernel: CR2: 0000000001633000 CR3: 000000006ac7e000 CR4: 00000000000006e0 
Oct 7 17:31:23 mythtv kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 
Oct 7 17:31:23 mythtv kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 
Oct 7 17:31:23 mythtv kernel: Process kswapd0 (pid: 266, threadinfo ffff88007d402000, task ffff88007ddc4530) 
Oct 7 17:31:23 mythtv kernel: Stack: ffff88007d403a20 ffffffff810e1b0c ffff88000aa2ad20 ffff88000000000a 
Oct 7 17:31:23 mythtv kernel: ffff8800311b6380 ffff8800311b6380 ffff880074fc5400 ffffe20000745350 
Oct 7 17:31:23 mythtv kernel: ffff88007d403a80 ffffffff81123222 ffff88007d403a70 ffff8800311b6380 
Oct 7 17:31:23 mythtv kernel: Call Trace: 
Oct 7 17:31:23 mythtv kernel: [<ffffffff810e1b0c>] try_to_free_buffers+0x9f/0xb6 
Oct 7 17:31:23 mythtv kernel: [<ffffffff81123222>] journal_try_to_free_buffers+0x14b/0x1ae 
Oct 7 17:31:23 mythtv kernel: [<ffffffff810935d6>] ? free_pages_check+0x82/0x8a 
Oct 7 17:31:23 mythtv kernel: [<ffffffff81114c70>] ext3_releasepage+0x72/0x7f 
Oct 7 17:31:23 mythtv kernel: [<ffffffff8108e339>] try_to_release_page+0x57/0x6d 
Oct 7 17:31:23 mythtv kernel: [<ffffffff810998d0>] shrink_page_list+0x4d9/0x61b 
Oct 7 17:31:23 mythtv kernel: [<ffffffff81099bfa>] shrink_inactive_list+0x1bf/0x473 
Oct 7 17:31:23 mythtv kernel: [<ffffffff81099f8a>] shrink_zone+0xdc/0xff 
Oct 7 17:31:23 mythtv kernel: [<ffffffff8109a901>] kswapd+0x3fe/0x580 
Oct 7 17:31:23 mythtv kernel: [<ffffffff8109929e>] ? isolate_pages_global+0x0/0x34 
Oct 7 17:31:23 mythtv kernel: [<ffffffff810554e9>] ? autoremove_wake_function+0x0/0x38 
Oct 7 17:31:23 mythtv kernel: [<ffffffff8109a503>] ? kswapd+0x0/0x580 
Oct 7 17:31:23 mythtv kernel: [<ffffffff810551a3>] kthread+0x49/0x76 
Oct 7 17:31:23 mythtv kernel: [<ffffffff81011719>] child_rip+0xa/0x11 
Oct 7 17:31:23 mythtv kernel: [<ffffffff81010a37>] ? restore_args+0x0/0x30 
Oct 7 17:31:23 mythtv kernel: [<ffffffff8105515a>] ? kthread+0x0/0x76 
Oct 7 17:31:23 mythtv kernel: [<ffffffff8101170f>] ? child_rip+0x0/0x11 
Oct 7 17:31:23 mythtv kernel: 
Oct 7 17:31:23 mythtv kernel: 
Oct 7 17:31:23 mythtv kernel: Code: 89 c7 7e d7 31 c0 3b 1d 4d e9 6e 00 0f 9f c0 89 05 2c e9 6e 00 5b 41 5c c9 c3 55 48 8d 47 48 48 39 47 48 48 89 fa 48 89 e5 74 
04 <0f> 0b eb fe 48 8b 3d 1b e9 6e 00 48 89 d6 e8 2d 96 fd ff 65 48 
Oct 7 17:31:23 mythtv kernel: RIP [<ffffffff810e16ea>] free_buffer_head+0x11/0x3e 
Oct 7 17:31:23 mythtv kernel: RSP <ffff88007d4039e0> 
Oct 7 17:31:23 mythtv kernel: ---[ end trace 3a87365f960b6996 ]--- 

and before this, there were a lot of message like this in the log: 

Oct 7 16:50:42 mythtv kernel: ivtv0: Cause: the application is not reading fast enough. 
Oct 7 16:50:43 mythtv kernel: ivtv0: All encoder MPG stream buffers are full. Dropping data. 
Oct 7 16:50:43 mythtv kernel: ivtv0: Cause: the application is not reading fast enough. 
Oct 7 16:50:43 mythtv kernel: ivtv0: All encoder MPG stream buffers are full. Dropping data. 
Oct 7 16:50:43 mythtv kernel: ivtv0: Cause: the application is not reading fast enough. 
Oct 7 16:50:43 mythtv kernel: ivtv0: All encoder MPG stream buffers are full. Dropping data. 
Oct 7 16:50:43 mythtv kernel: ivtv0: Cause: the application is not reading fast enough. 
Oct 7 16:50:43 mythtv kernel: ivtv0: All encoder MPG stream buffers are full. Dropping data. 
Oct 7 16:50:43 mythtv kernel: ivtv0: Cause: the application is not reading fast enough. 
Oct 7 16:50:43 mythtv kernel: ivtv0: All encoder MPG stream buffers are full. Dropping data. 
Oct 7 16:50:43 mythtv kernel: ivtv0: Cause: the application is not reading fast enough. 


I did not find anything related to this while searching the mailing list, so I wanted to post this in case 
it is something new or somebody else has seen it before. 
I am using MythDora 10.21 with kernel 2.6.27.30-170.2.82.fc10.x86_64 and latest mythtv packages. 
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