[CentOS] Errors in dmesg

Hi.

I have a RHEL server that has some errors in dmesg , what do they
mean, how do I fix them ?

mtrr: type mismatch for f9000000,800000 old: write-back new: write-combining
mtrr: type mismatch for f9000000,1000000 old: write-back new: write-combining
mtrr: type mismatch for f9fe0000,10000 old: write-back new: write-combining
mtrr: type mismatch for f9fc0000,20000 old: write-back new: write-combining
mtrr: type mismatch for f9f80000,40000 old: write-back new: write-combining
mtrr: type mismatch for f9f00000,80000 old: write-back new: write-combining
mtrr: type mismatch for f9e00000,100000 old: write-back new: write-combining
mtrr: type mismatch for f9c00000,200000 old: write-back new: write-combining
mtrr: type mismatch for f9800000,400000 old: write-back new: write-combining
mtrr: type mismatch for f9000000,800000 old: write-back new: write-combining
mtrr: type mismatch for f9fe0000,10000 old: write-back new: write-combining
mtrr: type mismatch for f9fc0000,20000 old: write-back new: write-combining
mtrr: type mismatch for f9f80000,40000 old: write-back new: write-combining
mtrr: type mismatch for f9f00000,80000 old: write-back new: write-combining
mtrr: type mismatch for f9e00000,100000 old: write-back new: write-combining
mtrr: type mismatch for f9c00000,200000 old: write-back new: write-combining
mtrr: type mismatch for f9800000,400000 old: write-back new: write-combining
mtrr: type mismatch for f9000000,800000 old: write-back new: write-combining
input: AT Translated Set 2 keyboard as /class/input/input4
altera_installe[6598]: segfault at 0000000000000000 rip
0000000000000000 rsp 00000000ffd6af2c error 14

INFO: task kjournald:1793 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kjournald     D ffff810c6a193e40     0  1793    843          1819  1789 (L-TLB)
 ffff81183fdc9cf0 0000000000000046 ffff810c3fbe4780 ffff810c3f574600
 ffff810c3f574600 000000000000000a ffff810c3f88f7e0 ffff810c3e843860
 0011dd0b95e546c6 000000000000a1a4 ffff810c3f88f9c8 0000000400074c00
Call Trace:
 [<ffffffff8006ecd9>] do_gettimeofday+0x40/0x90
 [<ffffffff8005a3ad>] getnstimeofday+0x10/0x29
 [<ffffffff800155a2>] sync_buffer+0x0/0x3f
 [<ffffffff800637de>] io_schedule+0x3f/0x67
 [<ffffffff800155dd>] sync_buffer+0x3b/0x3f
 [<ffffffff80063a0a>] __wait_on_bit+0x40/0x6e
 [<ffffffff800155a2>] sync_buffer+0x0/0x3f
 [<ffffffff80063aa4>] out_of_line_wait_on_bit+0x6c/0x78
 [<ffffffff800a34d6>] wake_bit_function+0x0/0x23
 [<ffffffff88033e56>] :jbd:journal_commit_transaction+0x968/0x10c2
 [<ffffffff8003d7d9>] lock_timer_base+0x1b/0x3c
 [<ffffffff880376a3>] :jbd:kjournald+0xc1/0x213
 [<ffffffff800a34a8>] autoremove_wake_function+0x0/0x2e
 [<ffffffff880375e2>] :jbd:kjournald+0x0/0x213
 [<ffffffff800a3290>] keventd_create_kthread+0x0/0xc4
 [<ffffffff8003264c>] kthread+0xfe/0x132
 [<ffffffff8005dfb1>] child_rip+0xa/0x11
 [<ffffffff800a3290>] keventd_create_kthread+0x0/0xc4
 [<ffffffff8003254e>] kthread+0x0/0x132
 [<ffffffff8005dfa7>] child_rip+0x0/0x11

INFO: task VBoxHeadless:20743 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
VBoxHeadless  D ffffffff801563dc     0 20743      1               20742 (NOTLB)
 ffff8107717ebd98 0000000000000086 0000000c717ebd18 0000000000000001
 0000000400000000 000000000000000a ffff810b3acfb040 ffff810c400a4040
 0011dd0835789020 00000000000161a0 ffff810b3acfb228 0000000400000092
Call Trace:
 [<ffffffff88036e55>] :jbd:log_wait_commit+0xa3/0xf5
 [<ffffffff800a34a8>] autoremove_wake_function+0x0/0x2e
 [<ffffffff8803179a>] :jbd:journal_stop+0x1d3/0x203
 [<ffffffff8002f96a>] __writeback_single_inode+0x1dd/0x31c
 [<ffffffff800f7454>] sync_inode+0x24/0x33
 [<ffffffff8804c37e>] :ext3:ext3_sync_file+0xce/0xf8
 [<ffffffff8004fe60>] do_fsync+0x52/0xa4
 [<ffffffff800e48c9>] __do_fsync+0x23/0x36
 [<ffffffff8005d28d>] tracesys+0xd5/0xe0

INFO: task VBoxHeadless:20743 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
VBoxHeadless  D ffffffff801563dc     0 20743      1               20742 (NOTLB)
 ffff8107717ebd98 0000000000000086 0000000c717ebd18 0000000000000001
 0000000400000000 000000000000000a ffff810b3acfb040 ffff810c400a4040
 0011dd0835789020 00000000000161a0 ffff810b3acfb228 0000000400000092
Call Trace:
 [<ffffffff88036e55>] :jbd:log_wait_commit+0xa3/0xf5
 [<ffffffff800a34a8>] autoremove_wake_function+0x0/0x2e
 [<ffffffff8803179a>] :jbd:journal_stop+0x1d3/0x203
 [<ffffffff8002f96a>] __writeback_single_inode+0x1dd/0x31c
 [<ffffffff800f7454>] sync_inode+0x24/0x33
 [<ffffffff8804c37e>] :ext3:ext3_sync_file+0xce/0xf8
 [<ffffffff8004fe60>] do_fsync+0x52/0xa4
 [<ffffffff800e48c9>] __do_fsync+0x23/0x36
 [<ffffffff8005d28d>] tracesys+0xd5/0xe0



Thanks