I have some NUCs running GNOME/gdm (following the pkg-readme
instructions). Typically the only application they're running is
Chromium. The people using them have reported them hanging at times.
The last one I had a report before rebooting and had a few things
tried; numlock light responds; they came back after blind typing
"boot r" so it seems likely that they might be in DDB.

Unsure if it's related or not but there are some warnings in
.cache/gdm/session.log. Some seem "normal" i.e.  there are plenty
of them including at times when no problems are reported

WARNING: Kernel has no file descriptor comparison support: Resource temporarily 
unavailable
WARNING: Kernel has no file descriptor comparison support: Resource temporarily 
unavailable

There's also something from gsd-media-keys which has often
(perhaps always) been seen in logs before hangs; this in session.log

(gsd-media-keys:15422): media-keys-plugin-WARNING **: 12:29:11.705: Unable to 
get default sink
[8310:834619968:1022/123242.016898:ERROR:mdns_responder.cc(885)] The mDNS 
responder manager is not started yet.
[8310:834619968:1022/124616.862337:ERROR:mdns_responder.cc(885)] The mDNS 
responder manager is not started yet.
WARNING: Kernel has no file descriptor comparison support: Resource temporarily 
unavailable
WARNING: Kernel has no file descriptor comparison support: Resource temporarily 
unavailable

and some vfprint NULL in syslog:

Oct 21 14:00:02 syslogd[14226]: restart
Oct 21 18:08:47 /bsd: drm:pid81340:intel_pipe_update_start *ERROR* [drm] 
*ERROR* Potential atomic update failure on pipe A
Oct 21 18:08:54 /bsd: drm:pid81340:intel_pipe_update_start *ERROR* [drm] 
*ERROR* Potential atomic update failure on pipe A
Oct 22 12:28:31 /bsd: drm:pid81340:intel_pipe_update_start *ERROR* [drm] 
*ERROR* Potential atomic update failure on pipe A
Oct 22 12:29:11 pulseaudio[32185]: [sndio] module-sndio.c: POLLHUP!
Oct 22 12:29:11 gsd-media-keys: vfprintf %s NULL in 
"gvc-mixer-output-set-property - card port name: %s"
Oct 22 12:29:12 gnome-shell: vfprintf %s NULL in "gvc-mixer-output-set-property 
- card port name: %s"

Obviously the null vfprintf aren't the direct cause of a machine crash
but very often seen as the last syslog entry before rebooting a machine
that has crashed - it might be a red herring but could also be a clue.

Running 6.8 now but they've seen similar hangs since at least 6.7
(they've run various snaps in between), maybe earlier.

I'm getting one of the machines sent to me to see if I can find a way to
reproduce it (not sure if I'll be able to get anything more from it even
if I do; there's no serial console and I don't think they have AMT)
but wondered if this rings any bells or if anyone has ideas.


OpenBSD 6.8 (GENERIC.MP) #98: Sun Oct  4 18:13:26 MDT 2020
    [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 4169572352 (3976MB)
avail mem = 4028157952 (3841MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xec240 (83 entries)
bios0: vendor Intel Corp. version "WYLPT10H.86A.0047.2018.0303.1725" date 
03/03/2018
bios0: Intel Corporation D34010WYK
acpi0 at bios0: ACPI 5.0
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP APIC FPDT FIDT SSDT SSDT MCFG HPET SSDT SSDT DMAR CSRT
acpi0: wakeup devices RP01(S4) PXSX(S4) PXSX(S4) PXSX(S4) RP04(S4) PXSX(S4) 
PXSX(S4) PXSX(S4) PXSX(S4) PXSX(S4) GLAN(S4) EHC1(S4) EHC2(S4) XHC_(S4) 
HDEF(S4) PEG0(S4) [...]
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i3-4010U CPU @ 1.70GHz, 1696.40 MHz, 06-45-01
cpu0: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,SRBDS_CTRL,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 99MHz
cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4.1.1.1, IBE
cpu1 at mainbus0: apid 2 (application processor)
cpu1: Intel(R) Core(TM) i3-4010U CPU @ 1.70GHz, 1696.09 MHz, 06-45-01
cpu1: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,SRBDS_CTRL,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: smt 0, core 1, package 0
cpu2 at mainbus0: apid 1 (application processor)
cpu2: Intel(R) Core(TM) i3-4010U CPU @ 1.70GHz, 1696.09 MHz, 06-45-01
cpu2: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,SRBDS_CTRL,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu2: 256KB 64b/line 8-way L2 cache
cpu2: smt 1, core 0, package 0
cpu3 at mainbus0: apid 3 (application processor)
cpu3: Intel(R) Core(TM) i3-4010U CPU @ 1.70GHz, 1696.08 MHz, 06-45-01
cpu3: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,SRBDS_CTRL,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu3: 256KB 64b/line 8-way L2 cache
cpu3: smt 1, core 1, package 0
ioapic0 at mainbus0: apid 8 pa 0xfec00000, version 20, 40 pins
acpimcfg0 at acpi0
acpimcfg0: addr 0xf8000000, bus 0-63
acpihpet0 at acpi0: 14318179 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 1 (RP01)
acpiprt2 at acpi0: bus 2 (RP04)
acpiprt3 at acpi0: bus -1 (PEG0)
acpiec0 at acpi0: not present
acpipci0 at acpi0 PCI0: 0x00000010 0x00000011 0x00000000
acpicmos0 at acpi0
"NTN0530" at acpi0 not configured
"PNP0C14" at acpi0 not configured
acpibtn0 at acpi0: PWRB
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
acpicpu0 at acpi0: C2(500@67 mwait.1@0x10), C1(1000@1 mwait.1), PSS
acpicpu1 at acpi0: C2(500@67 mwait.1@0x10), C1(1000@1 mwait.1), PSS
acpicpu2 at acpi0: C2(500@67 mwait.1@0x10), C1(1000@1 mwait.1), PSS
acpicpu3 at acpi0: C2(500@67 mwait.1@0x10), C1(1000@1 mwait.1), PSS
acpipwrres0 at acpi0: FN00, resource for FAN0
acpipwrres1 at acpi0: FN01, resource for FAN1
acpipwrres2 at acpi0: FN02, resource for FAN2
acpipwrres3 at acpi0: FN03, resource for FAN3
acpipwrres4 at acpi0: FN04, resource for FAN4
acpitz0 at acpi0: critical temperature is 105 degC
acpitz1 at acpi0: critical temperature is 105 degC
acpivideo0 at acpi0: GFX0
acpivout0 at acpivideo0: DD1F
cpu0: using VERW MDS workaround (except on vmm entry)
cpu0: Enhanced SpeedStep 1696 MHz: speeds: 1700, 1600, 1500, 1400, 1300, 1200, 
1100, 1000, 900, 800, 782 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core 4G Host" rev 0x09
inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics" rev 0x09
drm0 at inteldrm0
inteldrm0: msi, HASWELL, gen 7
azalia0 at pci0 dev 3 function 0 "Intel Core 4G HD Audio" rev 0x09: msi
azalia0: No codecs found
xhci0 at pci0 dev 20 function 0 "Intel 8 Series xHCI" rev 0x04: msi, xHCI 1.0
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 
addr 1
"Intel 8 Series MEI" rev 0x04 at pci0 dev 22 function 0 not configured
em0 at pci0 dev 25 function 0 "Intel I218-V" rev 0x04: msi, address 
ec:a8:6b:ff:8d:a3
azalia1 at pci0 dev 27 function 0 "Intel 8 Series HD Audio" rev 0x04: msi
azalia1: codecs: Realtek/0x0283
audio0 at azalia1
ppb0 at pci0 dev 28 function 0 "Intel 8 Series PCIE" rev 0xe4
pci1 at ppb0 bus 1
ppb1 at pci0 dev 28 function 3 "Intel 8 Series PCIE" rev 0xe4: msi
pci2 at ppb1 bus 2
iwm0 at pci2 dev 0 function 0 "Intel Dual Band Wireless AC 3160" rev 0x83, msi
ehci0 at pci0 dev 29 function 0 "Intel 8 Series USB" rev 0x04: apic 8 int 23
usb1 at ehci0: USB revision 2.0
uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 
addr 1
pcib0 at pci0 dev 31 function 0 "Intel 8 Series LPC" rev 0x04
ahci0 at pci0 dev 31 function 2 "Intel 8 Series AHCI" rev 0x04: msi, AHCI 1.3
ahci0: port 0: 3.0Gb/s
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 0 lun 0: <ATA, TOSHIBA MK3276GS, GS10> naa.5000039395987292
sd0: 305245MB, 512 bytes/sector, 625142448 sectors
ichiic0 at pci0 dev 31 function 3 "Intel 8 Series SMBus" rev 0x04: apic 8 int 18
iic0 at ichiic0
spdmem0 at iic0 addr 0x50: 4GB DDR3 SDRAM PC3-12800 SO-DIMM
isa0 at pcib0
isadma0 at isa0
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
wbsio0 at isa0 port 0x4e/2: NCT6776F rev 0x33
lm1 at wbsio0 port 0xa00/8: NCT6776F
vmm0 at mainbus0: VMX/EPT
uhidev0 at uhub0 port 1 configuration 1 interface 0 "Microsoft Wired Keyboard 
600" rev 2.00/3.00 addr 2
uhidev0: iclass 3/1
ukbd0 at uhidev0: 8 variable keys, 6 key codes
wskbd0 at ukbd0: console keyboard
uhidev1 at uhub0 port 1 configuration 1 interface 1 "Microsoft Wired Keyboard 
600" rev 2.00/3.00 addr 2
uhidev1: iclass 3/0, 2 report ids
uhid0 at uhidev1 reportid 1: input=2, output=0, feature=0
uhid1 at uhidev1 reportid 2: input=1, output=0, feature=0
uhidev2 at uhub0 port 4 configuration 1 interface 0 "PixArt Microsoft USB 
Optical Mouse" rev 1.10/1.00 addr 3
uhidev2: iclass 3/1
ums0 at uhidev2: 3 buttons, Z dir
wsmouse0 at ums0 mux 0
ugen0 at uhub0 port 7 "Intel product 0x07dc" rev 2.00/0.01 addr 4
fd0 at fdc0 drive 0: density unknown
uhub2 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 
2.00/0.04 addr 2
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a (492fdabf9373643a.a) swap on sd0b dump on sd0b
WARNING: / was not properly unmounted
inteldrm0: 1920x1080, 32bpp
wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation), using wskbd0
wsdisplay0: screen 1-5 added (std, vt100 emulation)
iwm0: hw rev 0x160, fw ver 17.3216344376.0, address d0:7e:35:f7:fc:10
fd1 at fdc0 drive 1: density unknown
wsmouse0 detached
ums0 detached
uhidev2 detached
uhidev2 at uhub0 port 4 configuration 1 interface 0 "PixArt Microsoft USB 
Optical Mouse" rev 1.10/1.00 addr 3
uhidev2: iclass 3/1
ums0 at uhidev2: 3 buttons, Z dir
wsmouse0 at ums0 mux 0
wsmouse0 detached
ums0 detached
uhidev2 detached
uhidev2 at uhub0 port 4 configuration 1 interface 0 "PixArt Microsoft USB 
Optical Mouse" rev 1.10/1.00 addr 3
uhidev2: iclass 3/1
ums0 at uhidev2: 3 buttons, Z dir
wsmouse0 at ums0 mux 0

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