Red Hat Bugzilla – Bug 463094
22.214.171.124-14.fc8 - WARNING: at drivers/ata/libata-core.c:4732 ata_qc_issue+0x41/0x21c [libata]()
Last modified: 2013-07-02 22:35:35 EDT
Created attachment 317322 [details]
kernel log just before the stack dump and the stack output itself
With medium/heavy IO on a raid 5 stack the kernel keeps ejecting multiple warning oopses
WARNING: at drivers/ata/libata-core.c:4732 ata_qc_issue+0x41/0x21c [libata]()
(the kernel is tainted since I have the NVIDIA video driver loaded but that shouldn't have any effect in the IO subsystem)
WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
Can you post the complete boot log?
Created attachment 317428 [details]
boot log and detail of controller
Additional information (bootlog)
Are you sure there is enough power to run all of those disks? (Things can seem okay until all of the disks try to do I/O at the same time.) Was it stable with an older kernel?
There is a 850W PSU driving those disks on 2 separated 12v @35A max rails.
The drives pull a maximum of 2A @12V at startup so even accounting for all the drives pulling max power simultaneously, the supply lines are more than adequate. 7*2*12 = 168W. The motherboard has it's own independent power rail supply.
It wasn't stable with older kernels either (it would occasionally hard lock and you'd be forced to reset manually)
Anyways,.. looking at the trace, I'm assuming that this is because the driver gets fed up and decides to try without NCQ tagged queueing enabled. But the WARN_ON statement is seeing some sort of tag information
Sep 21 13:27:09 emerald kernel: ata13.00: NCQ disabled due to excessive errors
Should be fixed in 2.6.27 providing the relevant patches got in.
SATA bug so one for Jeff anyway, and I think he merged the fix
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