CentOS - Sep 2014 - odd dmesg entries

every so often, I'm seeing these in my dmesg output, and I'm not sure 
what they are?

host[32625]: segfault at 0 ip 000000000040abb8 sp 00007ff59d36bd40 error 
4 in host[400000+1b000]
host[24560]: segfault at 0 ip 000000000040abb8 sp 00007f4fa1c4bd40 error 
4 in host[400000+1b000]
host[8354]: segfault at 0 ip 000000000040abb8 sp 00007fa07330dd40 error 
4 in host[400000+1b000]



in situ, the tail of dmesg looks like...

md: data-check of RAID array md0
md: minimum _guaranteed_  speed: 1000 KB/sec/disk.
md: using maximum available idle IO bandwidth (but not more than 200000 
KB/sec) for data-check.
md: using 128k window, over a total of 1953383232k.
md: md0: data-check done.
host[8758]: segfault at 0 ip 000000000040abb8 sp 00007f9b7914ed40 error 
4 in host[400000+1b000]
host[15122]: segfault at 0 ip 000000000040abb8 sp 00007f63edccad40 error 
4 in host[400000+1b000]
UDP: bad checksum. From 71.6.167.142:40000 to 207.111.214.246:44818 ulen 32
md: data-check of RAID array md0
md: minimum _guaranteed_  speed: 1000 KB/sec/disk.
md: using maximum available idle IO bandwidth (but not more than 200000 
KB/sec) for data-check.
md: using 128k window, over a total of 1953383232k.
md: md0: data-check done.
host[32625]: segfault at 0 ip 000000000040abb8 sp 00007ff59d36bd40 error 
4 in host[400000+1b000]
host[24560]: segfault at 0 ip 000000000040abb8 sp 00007f4fa1c4bd40 error 
4 in host[400000+1b000]
host[8354]: segfault at 0 ip 000000000040abb8 sp 00007fa07330dd40 error 
4 in host[400000+1b000]
md: data-check of RAID array md0
md: minimum _guaranteed_  speed: 1000 KB/sec/disk.
md: using maximum available idle IO bandwidth (but not more than 200000 
KB/sec) for data-check.
md: using 128k window, over a total of 1953383232k.
md: md0: data-check done.


-- 
john r pierce                                      37N 122W
somewhere on the middle of the left coast

On 9/21/2014 12:50, John R Pierce wrote:
> every so often, I'm seeing these in my dmesg output, and I'm not
sure
> what they are?
>
> host[32625]: segfault at 0 ip 000000000040abb8 sp 00007ff59d36bd40 error
> 4 in host[400000+1b000]
> host[24560]: segfault at 0 ip 000000000040abb8 sp 00007f4fa1c4bd40 error
> 4 in host[400000+1b000]
> host[8354]: segfault at 0 ip 000000000040abb8 sp 00007fa07330dd40 error
> 4 in host[400000+1b000]
Normally the "in $foo" bit at the end names a program or library.  I 
wonder if the host[$foo+$bar] syntax revers to a KVM guest?

It's odd that it's correlated in time with some automatic software RAID 
check you've got going there.  Is the order segfault-then-md as a 
closely-spaced pair, followed by a gap in time?