[mythtv-users] Kernel Panics

Eric Mesa ericsbinaryworld at gmail.com
Sun Apr 19 13:12:46 UTC 2009


MythTV was running just fine for me for a year.  Then, last December I
shut it down as I was going out of town for a week.  When I started it
back up it kept kernel panicing.  I kept rebooting and eventually it
started working again.  But in the last month it keeps freezing up every
other day.  I can't figure out what's causing the crashes.  Got the
following kernel panic which I was able to capture because I was ssh'd
into the box:

[mythtv at toadette recordings]$ 
Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel: Eeek! page_mapcount(page) went negative! (-1)

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:   page pfn = 392c4

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:   page->flags = 80010038

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:   page->count = 1

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:   page->mapping = f7647140

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:   vma->vm_ops = 0x0

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel: ------------[ cut here ]------------

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel: invalid opcode: 0000 [#1] SMP 

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel: Process httpd (pid: 2800, ti=e6a46000 task=e6a2a690
task.ti=e6a46000)

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel: Stack: c06cfab3 f7647140 e6a60b00 b8ac0000 c0474e98 00000000
392c4045 00000030 

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:        00000000 e6a51e70 e6a46e5c 00000000 00000001 b8c00000
e6a47b88 c18082a0 

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:        00000044 f763caa0 e6a46f5c ffffffae ffffffff c14d4c0c
0071ce00 e6a47b88 

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel: Call Trace:

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:  [<c0474e98>] unmap_vmas+0x2dd/0x58a

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:  [<c0477fa5>] exit_mmap+0x75/0xf0

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:  [<c042cfde>] mmput+0x34/0x78

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:  [<c0431a81>] do_exit+0x213/0x695

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:  [<c0431f79>] sys_exit_group+0x0/0xd

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:  [<c0438a2b>] get_signal_to_deliver+0x39b/0x3c8

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:  [<c040474a>] do_notify_resume+0x8c/0x6c8

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:  [<c040a03f>] restore_i387+0xa9/0x1d3

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:  [<c0497e4e>] dput+0x30/0xd7

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:  [<c0404ff5>] sys_sigreturn+0xd3/0x16e

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:  [<c0436f1e>] sys_rt_sigaction+0x65/0x79

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:  [<c04052ae>] work_notifysig+0x13/0x19

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel:  =======================

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel: Code: 8b 46 40 8b 50 08 b8 02 fb 6c c0 e8 59 3a fd ff 8b 46 48
85 c0 74 14 8b 40 10 85 c0 74 0d 8b 50 2c b8 20 fb 6c c0 e8 3e 3a fd ff
<0f> 0b eb fe 8b 53 10 89 d8 5e 59 5b 83 e2 01 5e f7 da 83 c2 04 

Message from syslogd at toadette at Apr 19 08:43:25 ...
 kernel: EIP: [<c047ae6d>] page_remove_rmap+0xe5/0x104 SS:ESP
0068:e6a46dc8

I'm running Mythdora 5, based on Fedora 8.  I was wondering if the
problem was caused by overheating, but it shouldn't be any hotter than
it was for the last year.  I haven't moved it.  I opened up the cover
and all the fans seem to be working.  Also, I thought I needed to dust
it, but there wasn't much dust in there at all.  

Can't figure out what I'm doing to cause this.  It happens if I'm
watching recorded programs, if it's sitting idle, if it's recording
programs, if it's transcoding programs.  In other words, it can happen
at any time.

Other interesting things, one time when I booted up after a kernel
panic, it took me to the setup screen as if I'd never used MythTV
before.  Then I did another reboot and everything was working.  Another
reboot today and now my recordings are gone.  (They're still on the HDD,
but mythtv thinks they're gone)

So suggestions would be really welcome!  Thanks!


------------- 
Eric Mesa 
http://www.ericsbinaryworld.com 
Most of the emails from this account should be signed with my GPG key so
that you know it's me. The only exception is when I'm using gmail from
the web. 

"You're one hundred percent positive that the ship which is crashed on
the bottom of this ocean is the ship which you said you were one hundred
percent positive could one hundred percent positively never crash? "
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