Now this is just for information. Yesterday I an into a problem with a new
install of Debian, motherboard being a Gigabyte X79-ud5 (this is
significant). Debain 7.0 was installed from DVD's then upgraded from the
net to 7.1.
This worked OK for a number of days then the follwing error came up in the
kernel log (it did not appear in dmesg).
"kernel BUG at /build/linux-s5x2oE/linux-3.2.46/mm/slab.c:514!
invalid opcode: 0000 [#1] SMP
CPU 4"
This was followed by a register dump and a call trace and another message..
"BUG: unable to handle kernel paging request at fffffffffffffff8"
an another register dump and call trace follwed by the message....
"Fixing recursive fault but reboot is needed"
Follwed by........
"INFO rcu_sched detected stalls on CPUs/tasks: { 4} (detected by 1, t=15002
jiffies)"
This was followed by an NMI backtrace.......
After reboot system started giving regular bug reports stating a CPU had
hard locked and the system was for all purposes unusable.
After anothe reboot I mamaged to get it in a lucid state for enough time to
compile my own kernel (3.7.9). System has worked OK since the custom kernel
was installed.
A glance through the logs showed the debian kernel was having problems with
the APIC. The previous version of debian testing obtained around 2 months
before the releae of 7.0 would not boot at all on theis motherboard due to
APIC problems.
It seems the current Debian kernel does not like a Gigabyte GA-X79 ud5
mother board.
System is working no problems on the custom kernel.
Its probably worth sending Debian a bug on this...................
Using linux for 20 years,
Lindsay
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