Martin Husemann asked:

> Can you try running it on a kernel with options LOCKDEBUG?

simple_lock: locking against myself
lock: 0xcb752264, currently at: ../../../../kern/kern_descrip.c:597
on CPU 1
last locked: ../../../../kern/kern_descrip.c:212
last unlocked: ../../../../kern/vfs_syscalls.c:1176

Other details as in my earlier message.

I tried one other thing just for grins: I moved /emul/ibcs2/dev/socksys
to /dev/socksys: my /dev is on the root fs, but /emul/ibcs2/dev involves
a mount and a null mount, which I thought might be throwing extra complexity
into the fs code, but it didn't make any difference, so it's moved back
to /emul/ibcs2/dev now.

-Chap