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re: kern/54317: System hang during boot

The following reply was made to PR kern/54317; it has been noted by GNATS.

From: matthew green <>
To: Thomas Klausner <>
Cc: NetBSD bugtracking <>
Subject: re: kern/54317: System hang during boot
Date: Mon, 24 Jun 2019 07:11:19 +1000

 Thomas Klausner writes:
 > On Sun, Jun 23, 2019 at 10:34:38PM +1000, Matthew Green wrote:
 > > >  So I tried disableing all radeon* and radeondrmkmsfb* and radeonfb*
 > > > with userconf, but that didn't help.
 > > 
 > > what happened?  i assume vga attached instead, and whatever the
 > > problem is remains, ie, probably not the gpu?
 > I got a text console (I didn't check the dmesg for details, but I can
 > if you want to know something in particular) and it hung in the same
 > place, after the line about setting tty flags.
 hmmm, try turning off ttyflags in rc.conf.  this may be
 triggering some problem ...
 alternatively, boot single user and run /etc/rc.d/ttyflags
 and see if that hangs, if it does, next attempt would be to
 comment various lines in /etc/ttys until ttyflags does _not_
 > > i would just keep disabling drivers -- there are a *lot* that
 > > attach something -- and see if anything helps.
 > There are a lot of drivers in GENERIC - are there any you would try
 > disabling first?
 hmmm, this might need a kernel or smarts in user conf:
 - disable @ acpi attachments (eg, pckbc)
 - disable com(4)
 - networks (re0, re1, athn0)

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