On Sat, Jan 17, 2026 at 07:53:14PM -0800, Mike Larkin wrote: > On Sat, Jan 17, 2026 at 12:18:28PM +0100, Walter Alejandro Iglesias wrote: > > This machine, apparently, hibernates correctly. Then, booting after the > > hibernation is complete, also apparently, unhibernates correctly. But, > > sometimes right after the image is uncompressed, sometimes after some > > command is executed in the console, sometimes later, you always end up > > with this same kernel panic (photos included in tarball): > > > > https://en.roquesor.com/Downloads/panic.tar.gz > > > > As I mentioned to mlarkin@ and krw@ in private, I knew for certain that > > this didn't happen with this machine. I used to test how it hibernated > > because I had it connected to a UPS when I used it (for many years) as a > > home mail-web server. And even though it's an old machine, I still use > > it occasionally, which is why I took the time to do the trace back. > > > > After three days installing snapshots I could find out in which one the > > panic starts happening and which modification causes it. > > > > This is the last snapshot working fine (the number of the beast :-): > > > > https://openbsd.cs.toronto.edu/archive/2025-05-22/amd64 > > > > kern.version=OpenBSD 7.7-current (GENERIC.MP) #666: Wed May 21 00:12:25 > > MDT 2025 > > [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP > > > > And this is the first when the issue appears: > > > > https://openbsd.cs.toronto.edu/archive/2025-05-23/amd64 > > > > kern.version=OpenBSD 7.7-current (GENERIC.MP) #667: Thu May 22 22:13:35 > > MDT 2025 > > [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP > > > > The modification that causes the issue is this: > > > > https://marc.info/?l=openbsd-cvs&m=174779996216651&w=2 > > > > After reverting those Mike's diffs in current, the panic disappears. > > > > I'll take a look at those diff again but I don't see how this could be the > problem.
Without being any expert, I initially thought the same; in fact, I tried these patches only because there were no others around that date that seemed related. Also, as krw@ told us privately, I deduced that something has to corrupt either the reserved memory or the image when creating it. > That diff just moved the allocation earlier. Maybe there's a double > free. I'll look. Intuitively, reviewing 'subr_hibernate.c.diff', the first that came to my mind was to try changing back the way km_free() is redistributed in your diff. I'm still inexperienced with this, they might be blind swings, but who knows, maybe I'll hit it by accident. :-) Keep in mind that I took great care in reverting those patches correctly, and just as the machine was started and resumed from hibernation, I used it for hours without experiencing a kernel panic. Finally, the first time I mentioned you this problem some months ago, I ran checks on the RAM and the disk, apparently both are functioning properly. > > -ml > > > > > dmesg: > > OpenBSD 7.8-current (GENERIC.MP) #206: Thu Jan 15 00:37:15 MST 2026 > > [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP > > real mem = 4269477888 (4071MB) > > avail mem = 4113260544 (3922MB) > > random: good seed from bootblocks > > mpath0 at root > > scsibus0 at mpath0: 256 targets > > mainbus0 at root > > bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xeb920 (70 entries) > > bios0: vendor Hewlett-Packard version "786E1 v01.16" date 08/17/2011 > > bios0: Hewlett-Packard HP Compaq dc7700 Convertible Minitower > > acpi0 at bios0: ACPI 1.0 > > acpi0: sleep states S0 S3 S4 S5 > > acpi0: tables DSDT FACP APIC ASF! MCFG TCPA SLIC HPET > > acpi0: wakeup devices PCI0(S4) COM1(S4) PEG1(S4) IGBE(S4) PCX1(S4) PCX2(S4) > > HUB_(S4) USB1(S3) USB2(S3) USB3(S3) USB4(S3) USB5(S3) EUS1(S3) EUS2(S3) > > PBTN(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)2 CPU 4300 @ 1.80GHz, 1795.56 MHz, 06-0f-02, patch > > 0000005d > > cpu0: cpuid 1 > > edx=bfebfbff<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> > > ecx=e39d<SSE3,DTES64,MWAIT,DS-CPL,EST,TM2,SSSE3,CX16,xTPR,PDCM> > > cpu0: cpuid 6 eax=1<SENSOR> ecx=1<EFFFREQ> > > cpu0: cpuid a vers=2, gp=2, gpwidth=40, ff=0, ffwidth=0 > > cpu0: cpuid 80000001 edx=20100800<NXE,LONG> ecx=1<LAHF> > > cpu0: MELTDOWN > > cpu0: 32KB 64b/line 8-way D-cache, 32KB 64b/line 8-way I-cache, 2MB > > 64b/line 8-way L2 cache > > 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, C-substates=0.2, IBE > > cpu1 at mainbus0: apid 1 (application processor) > > cpu1: Intel(R) Core(TM)2 CPU 4300 @ 1.80GHz, 1795.66 MHz, 06-0f-02, patch > > 0000005d > > cpu1: smt 0, core 1, package 0 > > ioapic0 at mainbus0: apid 1 pa 0xfec00000, version 20, 24 pins, remapped > > acpimcfg0 at acpi0 > > acpimcfg0: addr 0xf4000000, bus 0-63 > > acpihpet0 at acpi0: 14318179 Hz > > acpiprt0 at acpi0: bus 0 (PCI0) > > acpiprt1 at acpi0: bus -1 (PEG1) > > acpiprt2 at acpi0: bus 32 (PCX1) > > acpiprt3 at acpi0: bus -1 (PCX2) > > acpiprt4 at acpi0: bus 7 (HUB_) > > acpipci0 at acpi0 PCI0: 0x00000000 0x00000011 0x00000001 > > acpicmos0 at acpi0 > > "PNP0F13" at acpi0 not configured > > "PNP0303" at acpi0 not configured > > com0 at acpi0 COM1 addr 0x3f8/0x8 irq 4: ns16550a, 16 byte fifo > > "PNP0003" at acpi0 not configured > > acpibtn0 at acpi0: PBTN(wakeup) > > "PNP0C14" at acpi0 not configured > > acpicpu0 at acpi0: C1(@1 halt!), PSS > > acpicpu1 at acpi0: C1(@1 halt!), PSS > > cpu0: Enhanced SpeedStep 1795 MHz: speeds: 1800, 1200 MHz > > pci0 at mainbus0 bus 0 > > pchb0 at pci0 dev 0 function 0 "Intel 82Q965 Host" rev 0x02 > > inteldrm0 at pci0 dev 2 function 0 "Intel 82Q965 Video" rev 0x02 > > drm0 at inteldrm0 > > intagp0 at inteldrm0 > > agp0 at intagp0: aperture at 0xe0000000, size 0x10000000 > > inteldrm0: apic 1 int 16, I965G, gen 4 > > em0 at pci0 dev 25 function 0 "Intel ICH8 IGP AMT" rev 0x02: apic 1 int 19, > > address 00:0f:fe:77:4f:df > > uhci0 at pci0 dev 26 function 0 "Intel 82801H USB" rev 0x02: apic 1 int 20 > > uhci1 at pci0 dev 26 function 1 "Intel 82801H USB" rev 0x02: apic 1 int 21 > > ehci0 at pci0 dev 26 function 7 "Intel 82801H USB" rev 0x02: apic 1 int 22 > > 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 > > azalia0 at pci0 dev 27 function 0 "Intel 82801H HD Audio" rev 0x02: apic 1 > > int 21 > > azalia0: codecs: Realtek ALC262 > > audio0 at azalia0 > > ppb0 at pci0 dev 28 function 0 "Intel 82801H PCIE" rev 0x02 > > pci1 at ppb0 bus 32 > > uhci2 at pci0 dev 29 function 0 "Intel 82801H USB" rev 0x02: apic 1 int 20 > > uhci3 at pci0 dev 29 function 1 "Intel 82801H USB" rev 0x02: apic 1 int 21 > > ehci1 at pci0 dev 29 function 7 "Intel 82801H USB" rev 0x02: apic 1 int 20 > > usb1 at ehci1: USB revision 2.0 > > uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev > > 2.00/1.00 addr 1 > > ppb1 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0xf2 > > pci2 at ppb1 bus 7 > > pcib0 at pci0 dev 31 function 0 "Intel 82801HO LPC" rev 0x02 > > pciide0 at pci0 dev 31 function 2 "Intel 82801H SATA" rev 0x02: DMA, > > channel 0 configured to native-PCI, channel 1 configured to native-PCI > > pciide0: using apic 1 int 18 for native-PCI interrupt > > wd0 at pciide0 channel 0 drive 0: <KINGSTON SA400S37240G> > > wd0: 1-sector PIO, LBA48, 228936MB, 468862128 sectors > > wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 6 > > usb2 at uhci0: USB revision 1.0 > > uhub2 at usb2 configuration 1 interface 0 "Intel UHCI root hub" rev > > 1.00/1.00 addr 1 > > usb3 at uhci1: USB revision 1.0 > > uhub3 at usb3 configuration 1 interface 0 "Intel UHCI root hub" rev > > 1.00/1.00 addr 1 > > usb4 at uhci2: USB revision 1.0 > > uhub4 at usb4 configuration 1 interface 0 "Intel UHCI root hub" rev > > 1.00/1.00 addr 1 > > usb5 at uhci3: USB revision 1.0 > > uhub5 at usb5 configuration 1 interface 0 "Intel UHCI root hub" rev > > 1.00/1.00 addr 1 > > isa0 at pcib0 > > isadma0 at isa0 > > fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 > > 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 > > pcppi0 at isa0 port 0x61 > > spkr0 at pcppi0 > > lpt0 at isa0 port 0x378/4 irq 7 > > vscsi0 at root > > scsibus1 at vscsi0: 256 targets > > softraid0 at root > > scsibus2 at softraid0: 256 targets > > root on wd0a (14e7147b497b7d69.a) swap on wd0b dump on wd0b > > inteldrm0: 1680x1050, 32bpp > > wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation), using wskbd0 > > wsdisplay0: screen 1-5 added (std, vt100 emulation) > > > > usbdevs: > > Controller /dev/usb0: > > addr 01: 8086:0000 Intel, EHCI root hub > > high speed, self powered, config 1, rev 1.00 > > driver: uhub0 > > Controller /dev/usb1: > > addr 01: 8086:0000 Intel, EHCI root hub > > high speed, self powered, config 1, rev 1.00 > > driver: uhub1 > > Controller /dev/usb2: > > addr 01: 8086:0000 Intel, UHCI root hub > > full speed, self powered, config 1, rev 1.00 > > driver: uhub2 > > Controller /dev/usb3: > > addr 01: 8086:0000 Intel, UHCI root hub > > full speed, self powered, config 1, rev 1.00 > > driver: uhub3 > > Controller /dev/usb4: > > addr 01: 8086:0000 Intel, UHCI root hub > > full speed, self powered, config 1, rev 1.00 > > driver: uhub4 > > Controller /dev/usb5: > > addr 01: 8086:0000 Intel, UHCI root hub > > full speed, self powered, config 1, rev 1.00 > > driver: uhub5 > > > > -- > > Walter > > -- Walter
