I just upgraded my headless pcengines-apu1c from current (amd64, May 30) to a more recent current (amd64, June 2). Dmesg of the latter is enclosed below.
Upon rebooting the apu1c and logging in with SSH I noticed that the connection was unreliable (SSH would just stop printing characters), which was rather easily fixed by logging in with SSH again. After a couple of repeats the apu1c would seemingly freeze. Connecting the frozen apu1c to a laptop using a serial cable did not help as I was unable to login, no ddb, nothing. Rebooting the apu1c while being connected using a serial cable resulted in an expected startup and login prompt on the serial console. After login, and after a few seconds, I received the following on my console: re1: watchdog timeout re0: watchdog timeout re1: watchdog timeout ... While SSHing from the laptop to the apu1c, and monitoring using serial console, I just received more watchdog timeouts, which finally resulted in a freeze and no way to enter ddb. Reverting back to the previous kernel fixed the issue above. Question: can someone give a hint on how to track this issue? OpenBSD 6.1-current (GENERIC.MP) #91: Fri Jun 2 05:22:31 MDT 2017 dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP real mem = 4245995520 (4049MB) avail mem = 4111519744 (3921MB) mpath0 at root scsibus0 at mpath0: 256 targets mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.7 @ 0xdf16d820 (6 entries) bios0: vendor coreboot version "SageBios_PCEngines_APU-45" date 04/05/2014 bios0: PC Engines APU acpi0 at bios0: rev 0 acpi0: sleep states S0 S1 S3 S4 S5 acpi0: tables DSDT FACP SPCR HPET APIC HEST SSDT SSDT SSDT acpi0: wakeup devices AGPB(S4) HDMI(S4) PBR4(S4) PBR5(S4) PBR6(S4) PBR7(S4) PE20(S4) PE21(S4) PE22(S4) PE23(S4) PIBR(S4) UOH1(S3) UOH2(S3) UOH3(S3) UOH4(S3) UOH5(S3) [...] acpitimer0 at acpi0: 3579545 Hz, 32 bits acpihpet0 at acpi0: 14318180 Hz acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: AMD G-T40E Processor, 1000.16 MHz cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,MWAIT,SSSE3,CX16,POPCNT,NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG,LAHF,CMPLEG,SVM,EAPICSP,AMCR8,ABM,SSE4A,MASSE,3DNOWP,IBS,SKINIT,ITSC cpu0: 32KB 64b/line 2-way I-cache, 32KB 64b/line 8-way D-cache, 512KB 64b/line 16-way L2 cache cpu0: 8 4MB entries fully associative cpu0: DTLB 40 4KB entries fully associative, 8 4MB entries fully associative cpu0: TSC frequency 1000160340 Hz cpu0: smt 0, core 0, package 0 mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges cpu0: apic clock running at 199MHz cpu0: mwait min=64, max=64, IBE cpu1 at mainbus0: apid 1 (application processor) cpu1: AMD G-T40E Processor, 1000.00 MHz cpu1: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,MWAIT,SSSE3,CX16,POPCNT,NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG,LAHF,CMPLEG,SVM,EAPICSP,AMCR8,ABM,SSE4A,MASSE,3DNOWP,IBS,SKINIT,ITSC cpu1: 32KB 64b/line 2-way I-cache, 32KB 64b/line 8-way D-cache, 512KB 64b/line 16-way L2 cache cpu1: 8 4MB entries fully associative cpu1: DTLB 40 4KB entries fully associative, 8 4MB entries fully associative cpu1: smt 0, core 1, package 0 ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 21, 24 pins acpiprt0 at acpi0: bus -1 (AGPB) acpiprt1 at acpi0: bus -1 (HDMI) acpiprt2 at acpi0: bus 1 (PBR4) acpiprt3 at acpi0: bus 2 (PBR5) acpiprt4 at acpi0: bus 3 (PBR6) acpiprt5 at acpi0: bus -1 (PBR7) acpiprt6 at acpi0: bus 5 (PE20) acpiprt7 at acpi0: bus -1 (PE21) acpiprt8 at acpi0: bus -1 (PE22) acpiprt9 at acpi0: bus -1 (PE23) acpiprt10 at acpi0: bus 0 (PCI0) acpiprt11 at acpi0: bus 4 (PIBR) acpicpu0 at acpi0: C2(0@100 io@0x841), C1(@1 halt!), PSS acpicpu1 at acpi0: C2(0@100 io@0x841), C1(@1 halt!), PSS acpibtn0 at acpi0: PWRB cpu0: 1000 MHz: speeds: 1000 800 MHz pci0 at mainbus0 bus 0 pchb0 at pci0 dev 0 function 0 "AMD AMD64 14h Host" rev 0x00 ppb0 at pci0 dev 4 function 0 "AMD AMD64 14h PCIE" rev 0x00: msi pci1 at ppb0 bus 1 re0 at pci1 dev 0 function 0 "Realtek 8168" rev 0x06: RTL8168E/8111E (0x2c00), msi, address 00:0d:b9:33:8e:a4 rgephy0 at re0 phy 7: RTL8169S/8110S/8211 PHY, rev. 4 ppb1 at pci0 dev 5 function 0 "AMD AMD64 14h PCIE" rev 0x00: msi pci2 at ppb1 bus 2 re1 at pci2 dev 0 function 0 "Realtek 8168" rev 0x06: RTL8168E/8111E (0x2c00), msi, address 00:0d:b9:33:8e:a5 rgephy1 at re1 phy 7: RTL8169S/8110S/8211 PHY, rev. 4 ppb2 at pci0 dev 6 function 0 "AMD AMD64 14h PCIE" rev 0x00: msi pci3 at ppb2 bus 3 re2 at pci3 dev 0 function 0 "Realtek 8168" rev 0x06: RTL8168E/8111E (0x2c00), msi, address 00:0d:b9:33:8e:a6 rgephy2 at re2 phy 7: RTL8169S/8110S/8211 PHY, rev. 4 ahci0 at pci0 dev 17 function 0 "ATI SBx00 SATA" rev 0x40: apic 2 int 19, AHCI 1.2 ahci0: port 0: 6.0Gb/s scsibus1 at ahci0: 32 targets sd0 at scsibus1 targ 0 lun 0: <ATA, SAMSUNG SSD PM83, CXM1> SCSI3 0/direct fixed naa.5002538043584d30 sd0: 30533MB, 512 bytes/sector, 62533296 sectors, thin ohci0 at pci0 dev 18 function 0 "ATI SB700 USB" rev 0x00: apic 2 int 18, version 1.0, legacy support ehci0 at pci0 dev 18 function 2 "ATI SB700 USB2" rev 0x00: apic 2 int 17 usb0 at ehci0: USB revision 2.0 uhub0 at usb0 configuration 1 interface 0 "ATI EHCI root hub" rev 2.00/1.00 addr 1 ohci1 at pci0 dev 19 function 0 "ATI SB700 USB" rev 0x00: apic 2 int 18, version 1.0, legacy support ehci1 at pci0 dev 19 function 2 "ATI SB700 USB2" rev 0x00: apic 2 int 17 usb1 at ehci1: USB revision 2.0 uhub1 at usb1 configuration 1 interface 0 "ATI EHCI root hub" rev 2.00/1.00 addr 1 piixpm0 at pci0 dev 20 function 0 "ATI SBx00 SMBus" rev 0x42: polling iic0 at piixpm0 pcib0 at pci0 dev 20 function 3 "ATI SB700 ISA" rev 0x40 ppb3 at pci0 dev 20 function 4 "ATI SB600 PCI" rev 0x40 pci4 at ppb3 bus 4 ohci2 at pci0 dev 20 function 5 "ATI SB700 USB" rev 0x00: apic 2 int 18, version 1.0, legacy support ppb4 at pci0 dev 21 function 0 "ATI SB800 PCIE" rev 0x00 pci5 at ppb4 bus 5 ohci3 at pci0 dev 22 function 0 "ATI SB700 USB" rev 0x00: apic 2 int 18, version 1.0, legacy support ehci2 at pci0 dev 22 function 2 "ATI SB700 USB2" rev 0x00: apic 2 int 17 usb2 at ehci2: USB revision 2.0 uhub2 at usb2 configuration 1 interface 0 "ATI EHCI root hub" rev 2.00/1.00 addr 1 pchb1 at pci0 dev 24 function 0 "AMD AMD64 14h Link Cfg" rev 0x43 pchb2 at pci0 dev 24 function 1 "AMD AMD64 14h Address Map" rev 0x00 pchb3 at pci0 dev 24 function 2 "AMD AMD64 14h DRAM Cfg" rev 0x00 km0 at pci0 dev 24 function 3 "AMD AMD64 14h Misc Cfg" rev 0x00 pchb4 at pci0 dev 24 function 4 "AMD AMD64 14h CPU Power" rev 0x00 pchb5 at pci0 dev 24 function 5 "AMD AMD64 14h Reserved" rev 0x00 pchb6 at pci0 dev 24 function 6 "AMD AMD64 14h NB Power" rev 0x00 pchb7 at pci0 dev 24 function 7 "AMD AMD64 14h Reserved" rev 0x00 usb3 at ohci0: USB revision 1.0 uhub3 at usb3 configuration 1 interface 0 "ATI OHCI root hub" rev 1.00/1.00 addr 1 usb4 at ohci1: USB revision 1.0 uhub4 at usb4 configuration 1 interface 0 "ATI OHCI root hub" rev 1.00/1.00 addr 1 isa0 at pcib0 isadma0 at isa0 com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo com0: console com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo pcppi0 at isa0 port 0x61 spkr0 at pcppi0 lpt0 at isa0 port 0x378/4 irq 7 wbsio0 at isa0 port 0x2e/2: NCT5104D rev 0x52 usb5 at ohci2: USB revision 1.0 uhub5 at usb5 configuration 1 interface 0 "ATI OHCI root hub" rev 1.00/1.00 addr 1 usb6 at ohci3: USB revision 1.0 uhub6 at usb6 configuration 1 interface 0 "ATI OHCI root hub" rev 1.00/1.00 addr 1 vmm0 at mainbus0: SVM/RVI umass0 at uhub2 port 1 configuration 1 interface 0 "Generic Flash Card Reader/Writer" rev 2.01/1.00 addr 2 umass0: using SCSI over Bulk-Only scsibus2 at umass0: 2 targets, initiator 0 sd1 at scsibus2 targ 1 lun 0: <Multiple, Card Reader, 1.00> SCSI2 0/direct removable serial.058f6366058F63666485 sd1: 7600MB, 512 bytes/sector, 15564800 sectors vscsi0 at root scsibus3 at vscsi0: 256 targets softraid0 at root scsibus4 at softraid0: 256 targets root on sd0a (28fcdc10008babff.a) swap on sd0b dump on sd0b WARNING: / was not properly unmounted re1: watchdog timeout re0: watchdog timeout re1: watchdog timeout re1: watchdog timeout re1: watchdog timeout re1: watchdog timeout re1: watchdog timeout re0: watchdog timeout re1: watchdog timeout -- Björn Ketelaars GPG key: 0x4F0E5F21