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Date:      Wed, 12 Jul 2017 15:31:13 -0700
From:      Mark Millard <markmi@dsl-only.net>
To:        peter@rulingia.com, Michael Butler <imb@protected-networks.net>, "Rodney W. Grimes" <freebsd-rwg@pdx.rh.cn85.dnsmgr.net>
Cc:        FreeBSD Current <freebsd-current@freebsd.org>, linimon@FreeBSD.org
Subject:   Re: dump trying to access incorrect block numbers?
Message-ID:  <D0C95297-6EA0-4251-B8AB-29F9AD4FBB97@dsl-only.net>
In-Reply-To: <F623CD27-CAD4-4FFF-9277-EF1DEFBDAABD@dsl-only.net>
References:  <D54716CF-02E7-4AC9-8E01-12465EC16966@dsl-only.net> <73E92033-CB2F-404C-8B3F-736EF09AA9F7@dsl-only.net> <F623CD27-CAD4-4FFF-9277-EF1DEFBDAABD@dsl-only.net>

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I have extracted material from the list-exchanges
related to this and submitted:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220693

against the kernel for the issue.

I placed emphasis on the SSD-trim related "freeing
free block" panics that "fsck -B" can lead to
after it gets the g_vfs_done messages for unclean
ufs file systems but first noted that:

mksnap_ffs /.snap2

was enough to get the g_vfs_done messages.

I figured that the nastiest and most important known
consequences were "fsck -B" being broken for unclean
ufs file systems and having later panics trying to
trim based on how it is broken.

I did also mention dump as producing the messages.



I referenced. . .

> See also the exchange of list submittals associated
> with:
> 
> https://lists.freebsd.org/pipermail/freebsd-current/2017-July/066505.html
> 
> and:
> 
> https://lists.freebsd.org/pipermail/freebsd-current/2017-July/066508.html


===
Mark Millard
markmi at dsl-only.net





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