----- Original Message -----
From: "Neil Brown" <neilb@xxxxxxx>
To: "Janos Haar" <janos.haar@xxxxxxxxxxxx>
Cc: <linux-raid@xxxxxxxxxxxxxxx>
Sent: Tuesday, May 19, 2009 3:05 AM
Subject: Re: RCU detected CPU 1 stall (t=4295904002/751 jiffies) Pid: 902,
comm: md1_raid5
On Tuesday May 19, janos.haar@xxxxxxxxxxxx wrote:
Hello list, Neil,
Somebody can say something about this issue?
I am not surprised, if it is hardware related, but this is on a brand new
server, so i am looking for a solution... :-)
May 17 23:12:13 gladiator-afth1 kernel: RCU detected CPU 1 stall
(t=4295904002/751 jiffies)
I have no idea what this means.
I've occasionally seen this sort of message in early boot then the
system continued to work perfectly so I figured it was an early-boot
glitch. I suggest asking someone who understands RCU.
The entire log is here:
http://download.netcenter.hu/bughunt/20090518/messages
The system is on the md1, and working, but slowly.
How slowly? Is the slowness due to disk throughput?
No no, this is a fresh and idle server.
I have configured the disks, raid on another PC, and when it finished, i
have copy up the known good, pre-installed sw pack with old 2.6.18.
This pack is good, tested on many times, and this reports too this issue on
this machine. (first)
I have compiled the 2.6.28.10 on it, it takes about 6 hour! 8-/
But the 2.6.28.10 reports this too.
The slowness is not disk based, i think, on idle time if i move the selector
line in mc, this stopps too for some seconds or i can't type in bash when
this happens, and another one RCU message comes to the log...
(It happens periodically, independently of i am doing something or not.)
I am not sure, it is raid related or not, but the kernel reports only the
md1_raid5 pid, not another one.
This is why i am asking here first.
Thanks anyway. :-)
Have you tested the individual drives and compared that with the
array?
This is a brand new hw, with 4x500GB samsung drive, wich reports no problem
at all by smart.
If i left the server for 1 day, it will crash without a saved log.
This is a concern! It usually points to some sort of hardware
problem, but it is very hard to trace.
Is the power supply rated high enough to support all devices?
I am using 550W good quality new PS, and the PC uses only 55-65W, measured.
;-)
(1x core2duo, 4x hdd, nothing more interesting)
I cannot think of anything else to suggest .. except start swapping
components until the problem goes away...
In this way, i need to start with the motherboard. 8-(
Thanks a lot,
Janos Haar
NeilBrown
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