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Date: Sun, 20 Jul 2014 21:22:33 -0400
From: Nikolai Lifanov <lifanov@mail.lifanov.com>
To: Xin LI <delphij@freebsd.org>
Subject: Re: svn commit: r268855 - in head: cddl/contrib/opensolaris/cmd/ztest
 sys/cddl/contrib/opensolaris/uts/common/fs/zfs
 sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys
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On 2014-07-18 16:41, Xin LI wrote:
> Author: delphij
> Date: Fri Jul 18 20:41:40 2014
> New Revision: 268855
> URL: http://svnweb.freebsd.org/changeset/base/268855
> 
> Log:
>   MFV r268848:
> 
>   Instead of asserting all zio's be properly aligned, only assert
>   on the logical ones.
> 
>   Cap uberblocks at 8k, otherwise with ashift=17, there would be
>   only one uberblock.
> 
>   This fixes a problem that zdb would trip assert on pools with
>   ashift >= 0xe (8k).
> 
>   While there, also change the code so it only attempt to condense
>   space map unless the uncondensed size consumes greater than
>   zfs_metaslab_condense_block_threshold blocks.
> 
>   Illumos issue:
>     4958 zdb trips assert on pools with ashift >= 0xe
> 
>   MFC after:	2 weeks
> 

This specific commit makes boot hang just before mounting the root 
dataset for me when vfs.zfs.vdev.cache.size tunable is set. Unsetting 
this tunable or reverting this commit (currently running r268933 minus 
r268855) fixes the boot for me.

Please let me know if I can provide any more information.

- Nikolai Lifanov