Re: kern/53658: suspend from USB installer doesn't work if / is mounted read-write

["David H. Gutteridge" <david%gutteridge.ca@localhost>]

The following reply was made to PR kern/53658; it has been noted by GNATS.

From: "David H. Gutteridge" <david%gutteridge.ca@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/53658: suspend from USB installer doesn't work if / is
 mounted read-write
Date: Sun, 28 Oct 2018 22:28:19 -0400

 On Sun, 2018-10-14 at 19:00 -0400, David H. Gutteridge wrote:
 > I tried duplicating this with an 8.0_STABLE install kernel, and found
 > a different issue. In in order to trigger the panic, the kernel of
 > course has to support suspension on the particular hardware in
 > question, mine being a Lenovo T420, which instead yields:
 
 Correction, I can get the T420 to suspend by writing to
 hw.acpi.sleep.state. (I'd mistakenly assumed the "bad notify" message
 meant that wouldn't work.) With an amd64 installer image, without
 booting read-only, I get essentially the same backtrace. Booting
 read-only, suspending and resuming works almost perfectly.
 
 Here's the interesting thing: I also tried with an i386 installer
 image (of 8.99.25, built yesterday), and I cannot duplicate this
 issue with it. Booting with root mounted with write permissions,
 suspending and resuming works perfectly. So something's different
 between amd64 and i386 here.
 
 Dave