Re: 5.3-RELEASE: WARNING - WRITE_DMA interrupt timout - what does it mean?

On Nov 10, 2004, at 09:11, Søren Schmidt wrote:

> Zoltan Frombach wrote:
>> I just upgraded to 5.3-RELEASE a few days ago. This morning this line 
>> got into my system log file:
>> Nov  9 06:14:03 www kernel: ad0: WARNING - WRITE_DMA interrupt was 
>> seen but timeout fired LBA=2491143
>> I've never seen this message before. Can someone please explain what 
>> it means? With Thanks,
>
> It means that the disk has processed the write request (interrupt 
> seen), but that the system (the bio_taskqueue) hasn't been able to get 
> the result returned to the kernel.
>
> Your disk is not involved in this problem since it has done its part, 
> but the rest of the system is either busy with something else, or 
> there are bugs lurking that prohibits the bio_taskqueue from running.
>
> Either way its a WARNING not a FAILURE :)

This triggered my attention :-)

I have a server still running on 5.3-BETA1, with a (not very busy) 
MySQL server, and it bails out with this message when the above 
mentioned "warning" occurs in dmesg.

041109 22:26:18  InnoDB: Operating system error number 5 in a file 
operation.
InnoDB: Starting recovery from log files...

(5 == EIO?)

The WRITE_DMA (and the subsequent MySQL crash) ocurred when I was 
cleaning up disk space.

Basicly moving logfiles from /var to /usr, bzipping them and some other 
logs, so not very heavy I/O.

When it blew, I immediately stopped, deleted all the way too big 
logfiles, which I never will get any use for anyway, fixed newsyslog, 
and lived hapilly ever after :-)

I'm not sure if this is an issue solved between BETA1 and RELEASE 
(wasn't there some fixes in BETA7?) or if it's the one described here.

Anyway, this "WARNING" will cause software failure in other parts of 
the system.

Hardware:
The motherboard is a entry-level Intel (P4) board, probably with a ICH2

# atacontrol list
ATA channel 0:
     Master:  ad0 <Maxtor 6E030L0/NAR61590> ATA/ATAPI revision 7
     Slave:       no device present
ATA channel 1:
     Master:      no device present
     Slave:  acd0 <SAMSUNG CD-ROM SN-124/N100> ATA/ATAPI revision 0


Mvh,
Frode Nordahl

> -- 
>
> -Søren
>
>
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