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Date:      Sat, 08 Jan 2022 00:38:35 +0000
From:      bugzilla-noreply@freebsd.org
To:        standards@FreeBSD.org
Subject:   [Bug 255072] boot (legacy): no progress beyond 'BIOS DRIVE D: is disk1'
Message-ID:  <bug-255072-99-fHVhPSwHaL@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-255072-99@https.bugs.freebsd.org/bugzilla/>
References:  <bug-255072-99@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D255072

--- Comment #20 from spell@itl.ua ---
(In reply to Toomas Soome from comment #19)
> adding few printf() there would allow us to identify where exactly, and w=
hat are the values there causing the crash.

I've added tons of printf()'s and breakpoints through all that stack of
functions and finally reached as far as bd_edd_io().
Exactly it do fail.
I've added printf() with all arguments at the beginning of bd_edd_io() and
don't see obvious differences between argument sets that do work and argume=
nt
sets that crush the function.
Please help me further.

Another thing that I've observed is though the crashes look everytime simil=
ar
but occur not always exactly after the N's invocation of bd_edd_io(), saying
more precisely not after exact bcache_ops variable value (which is incremen=
ted
in bcache_strategy()).
Two adjacent boots with no code and hardware modifications can give differe=
nt
(but close) bcache_ops values right before crashes.

--=20
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