[Bug 255072] boot (legacy): no progress beyond 'BIOS DRIVE D: is disk1'

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 08 Jan 2022 09:24:30 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255072

--- Comment #22 from spell@itl.ua ---
(In reply to Warner Losh from comment #21)

> So is it a read or a write?

It is always read.

Replacing bd_edd_io() with bd_chs_io() didn't help.

> is this the first such I/O or not?

Not. I've added my own counters to bd_edd_io() and bd_chs_io() and see that
crash may occur e.g. upon 10th or 26th invocation of any of these two functions
(if counting only readings the Flash drive, not the HDD).

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