Re: Kernel 2.6.6 & 2.6.7 sometime hang after much I/O

[Nick Piggin]

Matthias Schniedermeyer wrote:
> Hi
>
>
>
> First. Kernels <= 2.6.5 don't have this problem. After 2.6.6 show this
> behaviour sometimes i downgraded to 2.6.5 as i thought that it would be
> fixed in 2.6.7, but 2.6.7 also show this behaviour.
>
> The I/O i do is split some large files (>2GB) into smaller files <= 2GB.
> Sometimes the process that does this just hangs (currently i have such a
> hangung process), top currently shows up to 90% I/O-Wait.
>
> SOME of my "konsole"s(xterm) hang then too, but others don't (like this
> where i type this email) starting new "konsole"s sometimes work, sometimes
> not.
>
> System is:
> Distribution: Debian SID.
> 2xP3-933Mhz, 3GB-RAM, Serverworks HE-SL-Chipset
> "System"-HDD is SCSI connected via Symbios-53c1010 (Dual U160)
> "Data"-HDD(s)(where the split-process does it's work) is connected to a
> Highpoint RocketRAID 1540 (HPT-374 Chipset)
> Filesystem is XFS for the Data-HDD(s) and Reiserfs for the system-HDD.
>
> If other info is needed i will provide them.

When the process has hung, press Alt + SysRq + T to get a task
trace. Run

	dmesg -s 1000000 > tmp

and send us tmp. You'd better send your .config and dmesg too.

Thanks
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