I see similar behavior on NetBSD/i386-7.1_RC1 except instead of panicking,
it just hangs. If console is VGA, one can break into DDB with Ctrl-Alt-Esc.
If console is serial port, sending BREAK does not drop into DDB.
Partial dmesg captured from serial console:
NetBSD 7.1_RC1 (GENERIC_PAE) #0: Thu Jan 19 20:05:01 CST 2017
[email protected]:/d0/build/netbsd-7/obj/i386/sys/arch/i386/compile/GENERIC_PAE
total memory = 8025 MB
avail memory = 7868 MB
WARNING: module error: module `nfs' pushed by boot loader already exists
kern.module.path=/stand/i386/7.1/modules
RTC BIOS diagnostic error 0x11<memory_size>
mainbus0 (root)
[...]
i915drmkms0 at pci0 dev 2 function 0: Intel 82Q45 Integrated Graphics Device
(rev. 0x03)
drm: Memory usable by graphics device = 512M
drm: Supports vblank timestamp caching Rev 2 (21.10.2013).
drm: Driver supports precise vblank timestamp query.
i915drmkms0: interrupting at ioapic0 pin 16 (i915)
warning: /x/netbsd-7/src/sys/external/bsd/drm2/dist/drm/i915/intel_pm.c:5719:
!power_domains->domain_use_count[domain]
[hung]
As with -current, disabling "i915drmkms" via userconf (either through
"boot -c" or "userconf=disable i915drmkms" in "/boot.cfg") avoids the
hang.
--
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