Re: netbsd-5 crash in scsipi

["Jonathan A. Kollasch" <jakllsch%kollasch.net@localhost>]

On Sun, Feb 20, 2011 at 02:32:10PM -0500, Chris Ross wrote:
> 
>   I have a machine that I just built and installed a netbsd-5 from today (Feb 
> 20, 2011).  I was untar'ing tarballs from another system into a subdirectory 
> of /var/tmp, and received the following panic:
> 
> sd0(ciss0:0:0:0): no free tags
> panic: scsipi_get_tag
> 
>   This is a dual-processor i386 machine, with an HP SmartArray 5i RAID 
> controller, presenting numerous sd(4) devices.  The destination filesystem 
> (/var/tmp) is sd0g.  WAPBL is enabled on all but the root filesystem of this 
> destination machine.
> 
>   I tried to replicate it again, and was able to extract one tarball, then 
> the next one failed and caused the same panic.  That tarball was of /var/log, 
> and does contain a few multi-hundred megabyte files.  Possible that's related?
> 
>   Anyone have any idea what happened here?  Is this indicative of an 
> instability in ciss(4), or WABPL ?

I'd guess it's a locking issue in the scsipi tag get/put code.
While ciss(4) is one of the few storage drivers that has modern locking,
I'm not sure scsipi does too.

        Jonathan Kollasch