Can someone help me decode these logs and tell me why the frontend crashes, and goes out to the plain X server window?

This is the /var/log/syslog

-Nick


Mar 31 00:10:17 mythtv kernel: BUG: using smp_processor_id() in preemptible [00000001] code: irblasterd/3511
Mar 31 00:10:17 mythtv kernel: caller is lirc_ioctl+0x280/0x340 [lirc_serial]
Mar 31 00:10:17 mythtv kernel: [debug_smp_processor_id+140/160] debug_smp_processor_id+0x8c/0xa0
Mar 31 00:10:17 mythtv kernel: [pg0+411701920/1067881472] lirc_ioctl+0x280/0x340 [lirc_serial]
Mar 31 00:10:17 mythtv kernel: [pg0+411594590/1067881472] irctl_ioctl+0x14e/0x190 [lirc_dev]
Mar 31 00:10:17 mythtv kernel: [do_ioctl+70/112] do_ioctl+0x46/0x70
Mar 31 00:10:17 mythtv kernel: [vfs_ioctl+83/448] vfs_ioctl+0x53/0x1c0
Mar 31 00:10:17 mythtv kernel: [sys_ioctl+71/112] sys_ioctl+0x47/0x70
Mar 31 00:10:17 mythtv kernel: [syscall_call+7/11] syscall_call+0x7/0xb
Mar 31 00:10:17 mythtv lircd-0.8.0pre4-pvr150[3511]: removed client
Mar 31 00:10:17 mythtv lircd-0.8.0pre4-pvr150[3511]: accepted new client on /dev/irblaster
Mar 31 00:10:18 mythtv kernel: BUG: using smp_processor_id() in preemptible [00000001] code: irblasterd/3511
Mar 31 00:10:18 mythtv kernel: caller is lirc_ioctl+0x8e/0x340 [lirc_serial]
Mar 31 00:10:18 mythtv kernel: [debug_smp_processor_id+140/160] debug_smp_processor_id+0x8c/0xa0
Mar 31 00:10:18 mythtv kernel: [pg0+411701422/1067881472] lirc_ioctl+0x8e/0x340 [lirc_serial]
Mar 31 00:10:18 mythtv kernel: [pg0+411594590/1067881472] irctl_ioctl+0x14e/0x190 [lirc_dev]
Mar 31 00:10:18 mythtv kernel: [do_ioctl+70/112] do_ioctl+0x46/0x70
Mar 31 00:10:18 mythtv kernel: [vfs_ioctl+83/448] vfs_ioctl+0x53/0x1c0
Mar 31 00:10:18 mythtv kernel: [sys_ioctl+71/112] sys_ioctl+0x47/0x70
Mar 31 00:10:18 mythtv kernel: [syscall_call+7/11] syscall_call+0x7/0xb
Mar 31 00:10:18 mythtv kernel: BUG: using smp_processor_id() in preemptible [00000001] code: irblasterd/3511
Mar 31 00:10:18 mythtv kernel: caller is lirc_ioctl+0x280/0x340 [lirc_serial]
Mar 31 00:10:18 mythtv kernel: [debug_smp_processor_id+140/160] debug_smp_processor_id+0x8c/0xa0
Mar 31 00:10:18 mythtv kernel: [pg0+411701920/1067881472] lirc_ioctl+0x280/0x340 [lirc_serial]
Mar 31 00:10:18 mythtv kernel: [pg0+411594590/1067881472] irctl_ioctl+0x14e/0x190 [lirc_dev]
Mar 31 00:10:18 mythtv kernel: [do_ioctl+70/112] do_ioctl+0x46/0x70
Mar 31 00:10:18 mythtv kernel: [vfs_ioctl+83/448] vfs_ioctl+0x53/0x1c0
Mar 31 00:10:18 mythtv kernel: [sys_ioctl+71/112] sys_ioctl+0x47/0x70
Mar 31 00:10:18 mythtv kernel: [syscall_call+7/11] syscall_call+0x7/0xb
Mar 31 00:10:18 mythtv lircd-0.8.0pre4-pvr150[3511]: removed client
Mar 31 00:10:18 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:19 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:20 mythtv mysqld[3430]: 060331 0:10:20 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:20 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:21 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:22 mythtv mysqld[3430]: 060331 0:10:22 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:24 mythtv mysqld[3430]: 060331 0:10:24 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:25 mythtv mysqld[3430]: 060331 0:10:25 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:26 mythtv mysqld[3430]: 060331 0:10:26 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:26 mythtv kernel: ivtv0: All encoder MPEG stream buffers are full. Dropping data.
Mar 31 00:10:26 mythtv kernel: ivtv0: Cause: the application is not reading fast enough.
Mar 31 00:10:26 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:27 mythtv mysqld[3430]: 060331 0:10:27 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:27 mythtv mysqld[3430]: 060331 0:10:27 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:27 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:27 mythtv mysqld[3430]: 060331 0:10:27 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:28 mythtv mysqld[3430]: 060331 0:10:28 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:28 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:29 mythtv mysqld[3430]: 060331 0:10:29 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:32 mythtv mysqld[3430]: 060331 0:10:32 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:33 mythtv mysqld[3430]: 060331 0:10:33 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:33 mythtv lircd-0.8.0pre4-pvr150[2841]: removed client
Mar 31 00:10:33 mythtv mysqld[3430]: 060331 0:10:33 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:33 mythtv mysqld[3430]: 060331 0:10:33 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:33 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:34 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:35 mythtv mysqld[3430]: 060331 0:10:35 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:35 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:36 mythtv mysqld[3430]: 060331 0:10:36 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:37 mythtv mysqld[3430]: 060331 0:10:37 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:39 mythtv mysqld[3430]: 060331 0:10:39 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:40 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:41 mythtv mysqld[3430]: 060331 0:10:41 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:41 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:43 mythtv last message repeated 2 times
Mar 31 00:10:45 mythtv mysqld[3430]: 060331 0:10:45 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:47 mythtv mysqld[3430]: 060331 0:10:47 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:47 mythtv kernel: ivtv0: All encoder MPEG stream buffers are full. Dropping data.
Mar 31 00:10:47 mythtv kernel: ivtv0: Cause: the application is not reading fast enough.
Mar 31 00:10:48 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:49 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:50 mythtv mysqld[3430]: 060331 0:10:50 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:50 mythtv last message repeated 3 times
Mar 31 00:10:50 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:51 mythtv kernel: ivtv0: All encoder MPEG stream buffers are full. Dropping data.
Mar 31 00:10:51 mythtv kernel: ivtv0: Cause: the application is not reading fast enough.
Mar 31 00:10:52 mythtv mysqld[3430]: 060331 0:10:52 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:54 mythtv mysqld[3430]: 060331 0:10:54 /usr/sbin/mysqld: Can't open file: 'recordedmarkup.MYI'. (errno: 145)
Mar 31 00:10:55 mythtv kernel: set_rtc_mmss: can't update from 59 to 10
Mar 31 00:10:57 mythtv last message repeated 2 times
Mar 31 00:11:03 mythtv kernel: set_rtc_mmss: can't update from 59 to 11
Mar 31 00:11:34 mythtv last message repeated 16 times

Sounds like you DB is damaged. There is sticky thread under one of the KnoppMyth subtopics about how to do basic repairs.