From owner-freebsd-hackers@FreeBSD.ORG  Tue Jul 26 18:19:38 2011
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Date: Tue, 26 Jul 2011 20:19:37 +0200
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From: Davide Italiano <davide.italiano@gmail.com>
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Subject: UMA large allocations issues
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It seems that today I've some good news.
I've done some job.
Before I tried stuffs userspace
http://davit.altervista.org/malloc_new.c , then I improved my patch a
bit http://davit.altervista.org/uma_large_allocations.patch )

So, the situation is follow. System starts (before it doesn't), but
I've a fatal trap 9, hmm, that's not great, and I guess that's not
fault of mine, it's caused from buf_hash_find() in arc.c
I've taken a look at arc.c code but doesn't seems that that function
performs large allocations.

What I've done is taking two shots (one about the panic the other one
about the bt
http://dl.dropbox.com/u/3530969/zfs_fail.png
http://dl.dropbox.com/u/3530969/zfs_fail2.png
)

I thought in a first phase that the trouble was related to the fact
that there weren't enough chunks, so I increased CHUNKS_SIZE variable
(now it's set to 200), but the issue remains the same.

Ideas?

Cheers

Davide