Re: port-evbarm/60214: panic: kernel diagnostic assertion "(armreg_ttbcr_read() & TTBCR_S_PD0) != 0" failed

["Nick Hudson via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR port-evbarm/60214; it has been noted by GNATS.

From: Nick Hudson <nick.hudson%gmx.co.uk@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: port-evbarm-maintainer%netbsd.org@localhost,
 gnats-admin%netbsd.org@localhost,
 netbsd-bugs%netbsd.org@localhost
Subject: Re: port-evbarm/60214: panic: kernel diagnostic assertion
 "(armreg_ttbcr_read() & TTBCR_S_PD0) != 0" failed
Date: Mon, 27 Apr 2026 18:30:53 +0100

 > On 27 Apr 2026, at 17:20, Andreas Gustafsson via gnats =
 <gnats-admin%NetBSD.org@localhost> wrote:
 >=20
 >> Number:         60214
 >> Category:       port-evbarm
 >> Synopsis:       panic: kernel diagnostic assertion =
 "(armreg_ttbcr_read() & TTBCR_S_PD0) !=3D 0" failed
 >> Confidential:   no
 >> Severity:       serious
 >> Priority:       high
 >> Responsible:    port-evbarm-maintainer
 >> State:          open
 >> Class:          sw-bug
 >> Submitter-Id:   net
 >> Arrival-Date:   Mon Apr 27 16:20:00 +0000 2026
 >> Originator:     Andreas Gustafsson
 >> Release:        NetBSD-current, source date >=3D 2026.04.19.15.09.50
 >> Organization:
 >=20
 >> Environment:
 > System: NetBSD
 > Architecture: arm
 > Machine: evbarm
 >> Description:
 >=20
 > Booting NetBSD/evbarm-earmv7hf under "qemu-system-arm -M virt" fails =
 with
 > a message like
 >=20
 >  panic: kernel diagnostic assertion "(armreg_ttbcr_read() & =
 TTBCR_S_PD0) !=3D 0" failed: file =
 "/dev/shm/build/2026.04.19.15.09.50-evbarm-earmv7hf-virt/src/sys/arch/arm/=
 arm32/pmap.c", line 5151
 >=20
 
 This is because qemu default cpu for -M virt is missing the Security =
 Extensions required for TTBCR.PD0.
 
 Perhaps my KASSERT expecting security extensions is over zealous and =
 should be relaxed to be dependent on security extensions being =
 available.