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From: Volodymyr Kostyrko <c.kworr@gmail.com>
Date: Mon, 19 Jul 2010 03:39:06 +0300
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Subject: zfs corruption
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Hi all.

I have trouble accessing one zpool. It's set as bootable an it even 
manages to load and start kernel, so I suppose I can rip some files off 
it. Yet after loading kernel it spits out:

panic: solaris asser: sm->sm_space + size <= sm->sm_size, file: 
/usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c, 
line:96

Line number is incorrect, I have added some extra code to obtain values:
sm->sm_space = 2147483648
size = 34304
sm->sm_size = 2147483648

Yes, sm_space is equal to sm_size here, and this leads to panic.

I'm still trying to page the code to understand where I can patch the 
driver to obtain a read only access.

Have anyone saw that before? If so could someone spare some bits of 
knowledge?

-- 
Sphinx of black quartz judge my vow.