i386 GENERIC_PAE panics (i915drmkms related?)

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

Booting i386-7.99.59 GENERIC_PAE on a Dell Optiplex 760 w/8GB RAM and
quad-core CPU panics as shown below (captured from serial console).
Booting non-PAE GENERIC works fine (but of course doesn't see the
additional memory).  Both kernels are from local release builds.


NetBSD 7.99.59 (GENERIC_PAE) #1: Tue Jan 17 16:17:00 CST 2017
	sysop%dpe2850b.technoskunk.fur@localhost:/d0/build/current/obj/i386/sys/arch/i386/compile/GENERIC_PAE
total memory = 8025 MB
avail memory = 7864 MB
WARNING: module error: module `nfs' pushed by boot loader already exists
running cgd selftest aes-xts-256 aes-xts-512 done
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/current/src/sys/external/bsd/drm2/dist/drm/i915/intel_pm.c:5719: !power_domains->domain_use_count[domain]
panic: cpu_switchto: switching above IPL_SCHED (8)
fatal breakpoint trap in supervisor mode
trap type 1 code 0 eip c010eca4 cs 8 eflags 246 cr2 0 ilevel 8 esp c16368e0
curlwp 0xc124b800 pid 0 lid 1 lowest kstack 0xc16342c0
Stopped in pid 0.1 (system) at  netbsd:breakpoint+0x4:  popl    %ebp
db{0}> bt
breakpoint(c0fad91e,c13463a0,c0100511,c16368fc,c124b800,0,c11d5c80,c16368f0,c093
81ca,c0100511) at netbsd:breakpoint+0x4
vpanic(c0100511,c16368fc,c163695c,c010050e,c0100511,8,c11d5c80,0,c124b800,c09115
3b) at netbsd:vpanic+0x121
snprintf(c0100511,8,c11d5c80,0,c124b800,c091153b,c124b800,ca314ba0,0,c1636950) a
t netbsd:snprintf
cpu_switchto(c124b800,ca1d0d40,ca67f6a0,1,c0ff27b5,c16369d0,c124b89c,c16369d0,ca
1cf340,c16369b4) at netbsd:cpu_switchto+0x1e
sleepq_block(0,0,c0ff27b5,c124aed0,ca321782,ca1d0d40,c16369cc,c16369d0,ca67f6a8,
c16369ec) at netbsd:sleepq_block+0x9a
cv_wait(c16369d0,c16369cc,0,ca32c098,0,c124b800,c124b8fc,c0ff27b5,1,ca1b160c) at
 netbsd:cv_wait+0x106
linux_flush_workqueue(ca32c098,c1636a14,c0a80431,ca1b1644,ca1b1644,ca1e4000,ffff
ffea,ca1e4000,c1636b44,c0a39eec) at netbsd:linux_flush_workqueue+0xd5
flush_scheduled_work(ca1b1644,ca1b1644,ca1e4000,ffffffea,ca1e4000,c1636b44,c0a39
eec,ca1b160c,15,48) at netbsd:flush_scheduled_work+0x13
intel_modeset_cleanup(ca1b160c,15,48,bda58001,ffffffff,4000,4000,0,0,ca1e47b0) a
t netbsd:intel_modeset_cleanup+0x96
i915_driver_load(ca1b160c,c0f036a0,c1636c8c,ca1b160c,ca689e4c,c1636b98,c05c48fe,
ca1b160c,c0f036a0,5) at netbsd:i915_driver_load+0x1452
drm_dev_register(ca1b160c,c0f036a0,5,ca689e5c,ca689e4c,ca689e54,ca689e5c,ca1b160
c,24,ca686208) at netbsd:drm_dev_register+0x7f
drm_pci_attach(ca686208,c1636c8c,ca68639c,c124fca0,c0f036a0,ca686398,ca325700,c0
f036a0,c1636c8c,c123a5b8) at netbsd:drm_pci_attach+0x30f
i915drmkms_attach(ca686b08,ca686208,c1636c8c,c1636c8c,c1275c78,ca686208,c1636c8c
,ca686b08,c1636c84,c1636c28) at netbsd:i915drmkms_attach+0xc0
config_attach_loc(ca686b08,c1275c78,c1636c84,c1636c8c,c018d311,d0,cc0,ca6e7000,1
0,c1636cd4) at netbsd:config_attach_loc+0x181
config_found_sm_loc(ca686b08,c0f9b741,c1636c84,c1636c8c,c018d311,c092076a,ca6e7d
58,2e12,3000003,2e128086) at netbsd:config_found_sm_loc+0x4f
pci_probe_device(ca6e7000,80001000,0,0,0,c1636d1a,2,0,0,0) at netbsd:pci_probe_d
evice+0x51b
pci_enumerate_bus(ca6e7000,c0cc8510,0,0,10,c1636e5c,10,ca6e7000,c1636da0,c018e8b
e) at netbsd:pci_enumerate_bus+0x1a7
pcirescan(ca686b08,c0f9b741,c0cc8510,c100fdda,2,4,ca686b08,c123a5b8,ca686b08,c0f
9b741) at netbsd:pcirescan+0x51
pciattach(ca1baa88,ca686b08,c1636e5c,c1636e5c,c12751e0,ca686b08,c1636e5c,ca1baa8
8,0,c1636df8) at netbsd:pciattach+0x17d
config_attach_loc(ca1baa88,c12751e0,0,c1636e5c,c0199a36,ca1ba188,0,c0f9b745,c0f9
b745,c1636e18) at netbsd:config_attach_loc+0x181
config_found_sm_loc(ca1baa88,c0f5fadc,0,c1636e5c,c0199a36,0,c1636e44,c015866d,ca
1baa88,c0f5fadc) at netbsd:config_found_sm_loc+0x4f
config_found_ia(ca1baa88,c0f5fadc,c1636e5c,c0199a36,ca338388,0,c0f5fadc,ca1ad350
,ca1baa88,c1636e98) at netbsd:config_found_ia+0x36
mp_pci_scan(ca1baa88,c1636e5c,c0199a36,0,c11d6760,c11d6760,c11d6740,c11d71c0,0,0
) at netbsd:mp_pci_scan+0x83
mainbus_rescan(ca1baa88,c0f5fadc,0,ca1baa88,8,c05c23e5,c12c9224,c0ffd9a4,ca326d7
0,ca325da0) at netbsd:mainbus_rescan+0x249
mainbus_attach(0,ca1baa88,0,0,c12751c8,ca1baa88,0,c0f5e66c,1659000,c1636f40) at n
etbsd:mainbus_attach+0x101
config_attach_loc(0,c12751c8,0,0,0,0,16800000,c1636f54,c010e703,c0f5e66c) at net
bsd:config_attach_loc+0x181
config_rootfound(c0f5e66c,0,0,c1636fa0,c0cbbd3e,3,6,3,0,0) at netbsd:config_root
found+0x4a
cpu_configure(3,6,3,0,0,0,0,0,0,3228d000) at netbsd:cpu_configure+0x2a
main(0,0,0,0,0,0,0,0,0,0) at netbsd:main+0x2ee
db{0}>


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