iscsi related softlockup (3.0 rc3)

I made some changes to my syscall fuzzer as it hasn't been turning up anything interesting since the last lot of problems got fixed. I seem to have found a way to get iscsi really confused, to the point that the soft-lockup detector kicks in, and then the rcu stall detector.

http://davej.fedorapeople.org/iscsi-lockup.txt is the dmesg from the box. sysrq was working, but I couldn't ssh into the box, or even log in on the console. I had ssh sessions already logged into the box which were completely wedged.

I don't have any iscsi setup configured on this machine, the fuzzer just hit upon that protocol randomly. If it wasn't for the fact that the machine wedged I wouldn't be overly concerned, but it seems that something got into a state that just consumed all cpu time.

Dave