Hi, On i386, with recent locally built GENERIC.MP, I have a uvm_fault after xenodm starting (the system is fine as long I don't start xenodm).
the last version of the source tree tested is 68a1d3c69b863445cb9e4c9789ec5053e29e77b2 (Sat Jun 13 14:00:50 2020 UTC). Please note that the trace below is from an slightly different tree (~ Thun Jun 11) as I tried to first reproduce with recent tree. Problem 100% reproductible on this particular host. manually transcribed trace: uvm_fault(0xd0e596fc, 0xd3095000, 0, 2) -> e kernel: page fault trap, code=0 Stopped at i915_gem_object_do_bit_17_swizzle+0x10b: lock andl $-0x9,0x28(%esi) ddb{0}> trace i915_gem_object_do_bit_17_swizzle(d525b4e4,d5d811e0) at i915_gem_object_do_bit_17_swizzle+0x10b shmem_get_pages(d525b4e4) at shmem_get_pages+0x1fd __i915_gem_object_get_pages(d525b4e4) at __i915_gem_object_get_pages+0x6a i915_fault(d525b4e4,f62bef98,10000000,0,57d21000,f62bef98,1,0,2) at i915_fault+0x1b3 drm_fault(f62bef98,57d21000,f62bef98,1,0,0,2,40) at drm_fault+0xf7 uvm_fault(d558f324,57d21000,0,2) at uvm_fault+0x617 trap(f62bf0b0) at trap+0x61b calltrap() at calltrap+0xc end of kernel full dmesg: OpenBSD 6.7-current (GENERIC.MP) #132: Sun Jun 14 10:01:53 CEST 2020 semarie@bert.local:/home/openbsd/src/sys/arch/i386/compile/GENERIC.MP real mem = 2137354240 (2038MB) avail mem = 2082136064 (1985MB) random: good seed from bootblocks mpath0 at root scsibus0 at mpath0: 256 targets mainbus0 at root bios0 at mainbus0: date 06/13/07, BIOS32 rev. 0 @ 0xffa10, SMBIOS rev. 2.4 @ 0xf7980 (44 entries) bios0: vendor Dell Inc. version "A17" date 06/13/2007 bios0: Dell Inc. MM061 acpi0 at bios0: ACPI 1.0 acpi0: sleep states S0 S3 S4 S5 acpi0: tables DSDT FACP HPET APIC MCFG SLIC BOOT SSDT acpi0: wakeup devices LID_(S3) PBTN(S4) MBTN(S5) PCI0(S3) USB0(S0) USB1(S0) USB2(S0) USB3(S0) EHCI(S0) AZAL(S3) PCIE(S4) RP01(S4) RP02(S3) RP03(S3) RP04(S3) RP05(S3) [...] acpitimer0 at acpi0: 3579545 Hz, 24 bits acpihpet0 at acpi0: 14318179 Hz acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: Genuine Intel(R) CPU T2400 @ 1.83GHz ("GenuineIntel" 686-class) 1.83 GHz, 06-0e-08 cpu0: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,MWAIT,VMX,EST,TM2,xTPR,PDCM,NXE,PERF,SENSOR,MELTDOWN mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges cpu0: apic clock running at 166MHz cpu0: mwait min=64, max=64, C-substates=0.2.2.2.2, IBE cpu1 at mainbus0: apid 1 (application processor) cpu1: Genuine Intel(R) CPU T2400 @ 1.83GHz ("GenuineIntel" 686-class) 1.83 GHz, 06-0e-08 cpu1: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,MWAIT,VMX,EST,TM2,xTPR,PDCM,NXE,PERF,SENSOR,MELTDOWN ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins, remapped acpimcfg0 at acpi0 acpimcfg0: addr 0xf0000000, bus 0-63 acpimcfg0: addr 0x0, bus 0-0 acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus -1 (AGP_) acpiprt2 at acpi0: bus 3 (PCIE) acpiprt3 at acpi0: bus 11 (RP01) acpiprt4 at acpi0: bus -1 (RP02) acpiprt5 at acpi0: bus -1 (RP03) acpiprt6 at acpi0: bus 12 (RP04) acpiprt7 at acpi0: bus -1 (RP05) acpiprt8 at acpi0: bus -1 (RP06) acpicpu0 at acpi0: !C3(250@85 io@0x1015), !C2(500@1 io@0x1014), C1(1000@1 halt), PSS acpicpu1 at acpi0: !C3(250@85 io@0x1015), !C2(500@1 io@0x1014), C1(1000@1 halt), PSS acpitz0 at acpi0: critical temperature is 126 degC "*pnp0c14" at acpi0 not configured acpiac0 at acpi0: AC unit online acpibat0 at acpi0: BAT0 model " DELLUD2649" serial 878 type LION oem "Sanyo" acpibtn0 at acpi0: LID_ acpibtn1 at acpi0: PBTN acpibtn2 at acpi0: SBTN "PNP0C32" at acpi0 not configured "PNP0A03" at acpi0 not configured acpicmos0 at acpi0 acpivideo0 at acpi0: VID_ acpivideo1 at acpi0: VID_ acpivout0 at acpivideo1: LCD_ acpivideo2 at acpi0: VID2 bios0: ROM list: 0xc0000/0xe800! 0xce800/0x1800 cpu0: Enhanced SpeedStep 1829 MHz: speeds: 1833, 1333, 1000 MHz pci0 at mainbus0 bus 0: configuration mode 1 (bios) pchb0 at pci0 dev 0 function 0 "Intel 82945GM Host" rev 0x03 inteldrm0 at pci0 dev 2 function 0 "Intel 82945GM Video" rev 0x03 drm0 at inteldrm0 intagp0 at inteldrm0 agp0 at intagp0: aperture at 0xd0000000, size 0x10000000 inteldrm0: apic 2 int 16, I945GM, gen 3 "Intel 82945GM Video" rev 0x03 at pci0 dev 2 function 1 not configured azalia0 at pci0 dev 27 function 0 "Intel 82801GB HD Audio" rev 0x01: msi azalia0: codecs: Sigmatel STAC9200, Conexant/0x2bfa, using Sigmatel STAC9200 audio0 at azalia0 ppb0 at pci0 dev 28 function 0 "Intel 82801GB PCIE" rev 0x01: apic 2 int 16 pci1 at ppb0 bus 11 wpi0 at pci1 dev 0 function 0 "Intel PRO/Wireless 3945ABG" rev 0x02: msi, MoW2, address 00:13:02:2e:8b:46 ppb1 at pci0 dev 28 function 3 "Intel 82801GB PCIE" rev 0x01: apic 2 int 19 pci2 at ppb1 bus 12 uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x01: apic 2 int 20 uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x01: apic 2 int 21 uhci2 at pci0 dev 29 function 2 "Intel 82801GB USB" rev 0x01: apic 2 int 22 uhci3 at pci0 dev 29 function 3 "Intel 82801GB USB" rev 0x01: apic 2 int 23 ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x01: apic 2 int 20 usb0 at ehci0: USB revision 2.0 uhub0 at usb0 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 ppb2 at pci0 dev 30 function 0 "Intel 82801BAM Hub-to-PCI" rev 0xe1 pci3 at ppb2 bus 3 bce0 at pci3 dev 0 function 0 "Broadcom BCM4401B1" rev 0x02: apic 2 int 17, address 00:15:c5:0b:8b:7a bmtphy0 at bce0 phy 1: BCM4401 10/100baseTX PHY, rev. 0 "Ricoh 5C832 Firewire" rev 0x00 at pci3 dev 1 function 0 not configured sdhc0 at pci3 dev 1 function 1 "Ricoh 5C822 SD/MMC" rev 0x19: apic 2 int 18 sdhc0: SDHC 1.0, 33 MHz base clock sdmmc0 at sdhc0: 4-bit, sd high-speed, mmc high-speed "Ricoh 5C843 MMC" rev 0x01 at pci3 dev 1 function 2 not configured "Ricoh 5C592 Memory Stick" rev 0x0a at pci3 dev 1 function 3 not configured "Ricoh 5C852 xD" rev 0x05 at pci3 dev 1 function 4 not configured ichpcib0 at pci0 dev 31 function 0 "Intel 82801GBM LPC" rev 0x01: PM disabled pciide0 at pci0 dev 31 function 2 "Intel 82801GBM SATA" rev 0x01: DMA, channel 0 wired to compatibility, channel 1 wired to compatibility wd0 at pciide0 channel 0 drive 0: <ST96812AS> wd0: 16-sector PIO, LBA48, 57241MB, 117231408 sectors wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 5 atapiscsi0 at pciide0 channel 1 drive 0 scsibus1 at atapiscsi0: 2 targets cd0 at scsibus1 targ 0 lun 0: <_NEC, DVD+-RW ND-6650A, 102C> removable cd0(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 2 ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x01: apic 2 int 17 iic0 at ichiic0 spdmem0 at iic0 addr 0x50: 1GB DDR2 SDRAM non-parity PC2-5300CL5 SO-DIMM spdmem1 at iic0 addr 0x52: 1GB DDR2 SDRAM non-parity PC2-5300CL5 SO-DIMM usb1 at uhci0: USB revision 1.0 uhub1 at usb1 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb2 at uhci1: USB revision 1.0 uhub2 at usb2 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb3 at uhci2: USB revision 1.0 uhub3 at usb3 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb4 at uhci3: USB revision 1.0 uhub4 at usb4 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1 isa0 at ichpcib0 isadma0 at isa0 pckbc0 at isa0 port 0x60/5 irq 1 irq 12 pckbd0 at pckbc0 (kbd slot) wskbd0 at pckbd0: console keyboard pms0 at pckbc0 (aux slot) wsmouse0 at pms0 mux 0 pms0: Synaptics touchpad, firmware 6.2, 0x180b1 0x200000 0x0 0xa04713 0x0 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16 uslcom0 at uhub3 port 1 configuration 1 interface 0 "Silicon Labs CP2102 USB to UART Bridge Controller" rev 1.10/1.00 addr 2 ucom0 at uslcom0 portno 0 vscsi0 at root scsibus2 at vscsi0: 256 targets softraid0 at root scsibus3 at softraid0: 256 targets root on wd0a (055d82c92ce5e61f.a) swap on wd0b dump on wd0b inteldrm0: 1280x800, 32bpp wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation), using wskbd0 wsdisplay0: screen 1-5 added (std, vt100 emulation) Thanks. -- Sebastien Marie