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Date:      Thu, 13 Dec 2012 12:25:48 +0200
From:      Andriy Gapon <avg@FreeBSD.org>
To:        Dimitry Andric <dim@FreeBSD.org>
Cc:        Volodymyr Kostyrko <c.kworr@gmail.com>, freebsd-current@FreeBSD.org, fs@FreeBSD.org
Subject:   Re: clang compiled kernel panic when mounting zfs root on i386
Message-ID:  <50C9AD2C.7000301@FreeBSD.org>
In-Reply-To: <50C8DC8E.1080204@FreeBSD.org>
References:  <50b37d46.8584440a.735c.ffffb4e6@mx.google.com> <20121126171658.GD3013@kib.kiev.ua> <20121127071243.D1255@besplex.bde.org> <20121129232944.GQ3013@kib.kiev.ua> <50b8a9c5.e64dec0a.1d88.133a@mx.google.com> <20121130164715.GW3013@kib.kiev.ua> <50b9cf0c.0fd9650a.5bbf.ffffb9b3@mx.google.com> <20121203224132.GJ3013@kib.kiev.ua> <50C880D7.1040907@gmail.com> <50C8DC8E.1080204@FreeBSD.org>

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on 12/12/2012 21:35 Dimitry Andric said the following:
> Especially the recursive spa_load and traverse_visitbp calls are scary,
> because that can grow out of hand very quickly.  It is probably tricky
> to remove the recursion...

Re-entering spa_load once is normal and is expected.
traverse_visitbp is also expected to recurse depending on data layout.
So yeah, it's probably even trickier than teaching clang to allocate smaller stack
frames ;-)

-- 
Andriy Gapon



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