Kernel panic on ThinkPad x220 after upgrade to 7.9

>Synopsis:	Frequent panic on ThinkPad x220 after upgrade to 7.9
>Category:	crash
>Environment:
	System      : OpenBSD 7.9
	Details     : OpenBSD 7.9 (GENERIC.MP) #449: Wed May  6 13:17:25 MDT 2026
			 [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP

	Architecture: OpenBSD.amd64
	Machine     : amd64
>Description:
	System (a ThinkPad x220, ca. 2011) experiences frequent kernel panics since upgrading to 
        OpenBSD 7.9.
        Console only displays a message that says "panic: malloc: out of space in kmem_map"
>How-To-Repeat:
	
>Fix:
	


dmesg:
OpenBSD 7.9 (GENERIC.MP) #449: Wed May  6 13:17:25 MDT 2026
    [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 4151963648 (3959MB)
avail mem = 3998588928 (3813MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.6 @ 0xdaa9c000 (64 entries)
bios0: vendor LENOVO version "8DET76WW (1.46 )" date 06/21/2018
bios0: LENOVO 4291AF2
acpi0 at bios0: ACPI 4.0
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP SLIC SSDT SSDT SSDT HPET APIC MCFG ECDT ASF! TCPA SSDT SSDT DMAR UEFI UEFI UEFI
acpi0: wakeup devices LID_(S3) SLPB(S3) IGBE(S4) EXP4(S4) EXP7(S4) EHC1(S3) EHC2(S3) HDEF(S4)
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: Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz, 2491.94 MHz, 06-2a-07, patch 0000002f
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=17bae3ff<SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX>
cpu0: cpuid 6 eax=77<SENSOR,ARAT,PTS> ecx=9<EFFFREQ>
cpu0: cpuid 7.0 edx=9c000400<MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD>
cpu0: cpuid a vers=3, gp=4, gpwidth=48, ff=3, ffwidth=48
cpu0: cpuid d.1 eax=1<XSAVEOPT>
cpu0: cpuid 80000001 edx=28100800<NXE,RDTSCP,LONG> ecx=1<LAHF>
cpu0: cpuid 80000007 edx=100<ITSC>
cpu0: MELTDOWN
cpu0: 32KB 64b/line 8-way D-cache, 32KB 64b/line 8-way I-cache, 256KB 64b/line 8-way L2 cache, 3MB 64b/line 12-way L3 cache
cpu0: smt 0, core 0, package 0, type P
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=0.2.1.1.2, IBE
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz, 2491.94 MHz, 06-2a-07, patch 0000002f
cpu1: smt 1, core 0, package 0, type SP
cpu2 at mainbus0: apid 2 (application processor)
cpu2: Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz, 2491.96 MHz, 06-2a-07, patch 0000002f
cpu2: smt 0, core 1, package 0, type P
cpu3 at mainbus0: apid 3 (application processor)
cpu3: Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz, 2491.98 MHz, 06-2a-07, patch 0000002f
cpu3: smt 1, core 1, package 0, type SP
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins
acpimcfg0 at acpi0
acpimcfg0: addr 0xf8000000, bus 0-63
acpiec0 at acpi0
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (PEG_)
acpiprt2 at acpi0: bus 2 (EXP1)
acpiprt3 at acpi0: bus 3 (EXP2)
acpiprt4 at acpi0: bus 5 (EXP4)
acpiprt5 at acpi0: bus 13 (EXP5)
acpiprt6 at acpi0: bus -1 (EXP7)
acpibtn0 at acpi0: LID_(wakeup)
acpibtn1 at acpi0: SLPB(wakeup)
acpipci0 at acpi0 PCI0: 0x00000000 0x00000011 0x00000001
acpicmos0 at acpi0
"PNP0303" at acpi0 not configured
"LEN0020" at acpi0 not configured
tpm0 at acpi0 TPM_ 1.2 (TIS) addr 0xfed40000/0x5000, device 0x0000104a rev 0x4e
acpibat0 at acpi0: BAT0 model "42T4861" serial 12403 type LION oem "SANYO"
acpiac0 at acpi0: AC unit online
acpithinkpad0 at acpi0: version 1.0
"PNP0C14" at acpi0 not configured
"PNP0C14" at acpi0 not configured
acpicpu0 at acpi0: C3(350@104 io@0x415), C1(1000@1 halt), PSS
acpicpu1 at acpi0: C3(350@104 io@0x415), C1(1000@1 halt), PSS
acpicpu2 at acpi0: C3(350@104 io@0x415), C1(1000@1 halt), PSS
acpicpu3 at acpi0: C3(350@104 io@0x415), C1(1000@1 halt), PSS
acpipwrres0 at acpi0: PUBS, resource for EHC1, EHC2
acpitz0 at acpi0
acpitz0: critical temperature is 99 degC
acpidock0 at acpi0: GDCK not docked (0)
acpivideo0 at acpi0: VID_
acpivout0 at acpivideo0: LCD0
acpivideo1 at acpi0: VID_
cpu0: using VERW MDS workaround (except on vmm entry)
cpu0: Enhanced SpeedStep 2491 MHz: speeds: 2501, 2500, 2200, 2000, 1800, 1600, 1400, 1200, 1000, 800 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core 2G Host" rev 0x09
inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 3000" rev 0x09
drm0 at inteldrm0
inteldrm0: msi, SANDYBRIDGE, gen 6
"Intel 6 Series MEI" rev 0x04 at pci0 dev 22 function 0 not configured
em0 at pci0 dev 25 function 0 "Intel 82579LM" rev 0x04: msi, address f0:de:f1:c1:4f:59
ehci0 at pci0 dev 26 function 0 "Intel 6 Series USB" rev 0x04: apic 2 int 16
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 6 Series HD Audio" rev 0x04: msi
azalia0: codecs: Conexant CX20590, Intel/0x2805, using Conexant CX20590
audio0 at azalia0
ppb0 at pci0 dev 28 function 0 "Intel 6 Series PCIE" rev 0xb4: msi
pci1 at ppb0 bus 2
ppb1 at pci0 dev 28 function 1 "Intel 6 Series PCIE" rev 0xb4: msi
pci2 at ppb1 bus 3
iwn0 at pci2 dev 0 function 0 "Intel Centrino Advanced-N 6205" rev 0x34: msi, MIMO 2T2R, MoW, address 10:0b:a9:75:46:40
ppb2 at pci0 dev 28 function 3 "Intel 6 Series PCIE" rev 0xb4: msi
pci3 at ppb2 bus 5
ppb3 at pci0 dev 28 function 4 "Intel 6 Series PCIE" rev 0xb4: msi
pci4 at ppb3 bus 13
sdhc0 at pci4 dev 0 function 0 "Ricoh 5U823 SD/MMC" rev 0x04: msi
sdhc0: SDHC 3.00, 50 MHz base clock
sdmmc0 at sdhc0: 4-bit, sd high-speed, mmc high-speed, dma
ehci1 at pci0 dev 29 function 0 "Intel 6 Series USB" rev 0x04: apic 2 int 23
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
pcib0 at pci0 dev 31 function 0 "Intel QM67 LPC" rev 0x04
ahci0 at pci0 dev 31 function 2 "Intel 6 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, ST320LT020-9YG14, 0003> naa.5000c5005314cc71
sd0: 305245MB, 512 bytes/sector, 625142448 sectors
ichiic0 at pci0 dev 31 function 3 "Intel 6 Series SMBus" rev 0x04: apic 2 int 18
iic0 at ichiic0
spdmem0 at iic0 addr 0x51: 4GB DDR3 SDRAM PC3-10600 SO-DIMM
isa0 at pcib0
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
wsmouse1 at pms0 mux 0
pms0: Synaptics clickpad, firmware 8.0, 0x1e2b1 0x940300 0x194b40 0xd001a3 0x120c00
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
aps0 at isa0 port 0x1600/31
vmm0 at mainbus0: VMX/EPT
uhub2 at uhub0 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.00 addr 2
ugen0 at uhub2 port 4 "Broadcom Corp Broadcom Bluetooth Device" rev 2.00/7.48 addr 3
uvideo0 at uhub2 port 6 configuration 1 interface 0 "Chicony Electronics Co., Ltd. Integrated Camera" rev 2.00/8.54 addr 4
video0 at uvideo0
uhub3 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.00 addr 2
umodem0 at uhub3 port 4 configuration 1 interface 1 "Lenovo F5521gw" rev 2.00/0.00 addr 3
umodem0: data interface 2, has CM over data, has break
umodem0: status change notification available
ucom0 at umodem0: usb1.1.00004.2
umodem1 at uhub3 port 4 configuration 1 interface 3 "Lenovo F5521gw" rev 2.00/0.00 addr 3
umodem1: data interface 4, has CM over data, has break
umodem1: status change notification available
ucom1 at umodem1: usb1.1.00004.4
umodem2 at uhub3 port 4 configuration 1 interface 9 "Lenovo F5521gw" rev 2.00/0.00 addr 3
umodem2: data interface 10, has CM over data, has break
umodem2: status change notification available
ucom2 at umodem2: usb1.1.00004.10
ugen1 at uhub3 port 4 configuration 1 "Lenovo F5521gw" rev 2.00/0.00 addr 3
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a (a58677075d3c8e53.a) swap on sd0b dump on sd0b
WARNING: / was not properly unmounted
inteldrm0: 1366x768, 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
addr 02: 8087:0024 Intel, Rate Matching Hub
	 high speed, self powered, config 1, rev 0.00
	 driver: uhub2
addr 03: 0a5c:217f Broadcom Corp, Broadcom Bluetooth Device
	 full speed, self powered, config 1, rev 7.48, iSerial E4D53DCAE83E
	 driver: ugen0
addr 04: 04f2:b217 Chicony Electronics Co., Ltd., Integrated Camera
	 high speed, power 200 mA, config 1, rev 8.54
	 driver: uvideo0
Controller /dev/usb1:
addr 01: 8086:0000 Intel, EHCI root hub
	 high speed, self powered, config 1, rev 1.00
	 driver: uhub1
addr 02: 8087:0024 Intel, Rate Matching Hub
	 high speed, self powered, config 1, rev 0.00
	 driver: uhub3
addr 03: 0bdb:1911 Lenovo, F5521gw
	 high speed, self powered, config 1, rev 0.00, iSerial DB65356A86B08D00
	 driver: umodem0
	 driver: umodem1
	 driver: umodem2
	 driver: ugen1