[issue833] cache_lock: blocked on 0xe29c3b08 ""

[David W]

I seem to have spoke to soon as I can now reproduce this in a virtual machine. This is how I
was able to reproduce it. qemu -smp 2 with kernel options SMP and QUOTA. It seems that after
running touch /home/quota.user as root (maybe after rebooting or not) things start to get
weird (/home is a userquota filesystem). I get sigreturn: eflags 0x206 messages in the console
as well as others like 0x80207 and 0x80203. Also root's shell beings to lock up and subsequent
logins as root lock up after simple commands like "ls".
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