Synopsis:       kernel panic while building userland
Category:       system kernel amd64
Environment:
        System      : OpenBSD 7.7
Details : OpenBSD 7.7-current (GENERIC.MP) #708: Mon Jun 9 20:52:14 MDT 2025
                         
dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP

        Architecture: OpenBSD.amd64
        Machine     : amd64
Description:
        kernel panic while building userland in a tmux session
How-To-Repeat:
        run `make build -j4` in a tmux session
Fix:
        so far only OpenBSD 7.6 seems to be stable

Related: https://marc.info/?l=openbsd-bugs&m=174860986624388&w=2

ddb{1}> show panic
*cpu1: pool_cache_item_magic_check: pvpl cpu free list modified: item addr 0xff
fffd83e07f39c8+24 0xffb5964604070453!=0xffb596c604070453
ddb{1}> trace
db_enter() at db_enter+0x14
panic(ffffffff82547673) at panic+0xdd
pool_cache_get(ffffffff82b1e0a8) at pool_cache_get+0x28a
pool_get(ffffffff82b1e0a8,2) at pool_get+0x62
pmap_enter(fffffd83cddb4608,26d2a4d8000,479550000,3,22) at pmap_enter+0xc0
uvm_fault_lower(ffff800048c0d428,ffff800048c0d460,ffff800048c0d3a0) at uvm_faul
t_lower+0x27c
uvm_fault(fffffd83901975a8,26d2a4d8000,0,2) at uvm_fault+0x1c5
upageflttrap(ffff800048c0d590,26d2a4d8b70) at upageflttrap+0x6c
usertrap(ffff800048c0d590) at usertrap+0x217
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x73fd1e232fb0, count: -10
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
*54949   54186  58773      0  7         0x3                miniperl
 58773  379556  89394      0  3    0x10008b  sigsusp       sh
 89394  377419  68151      0  3    0x10008b  sigsusp       make
 68151   17104  52449      0  3        0x83  wait          miniperl
 88438  170233   2224   1000  3    0x100083  kqread        top
 52449   57608  93580      0  3    0x10008b  sigsusp       sh
 93580  471873  93875      0  3    0x10008b  sigsusp       make
 93875  457671  82132      0  3    0x10008b  sigsusp       sh
 82132  482702   4461      0  3    0x10008b  sigsusp       make
  4461  522354  48629      0  3    0x10008b  sigsusp       sh
 48629  403729  93120      0  3    0x10008b  sigsusp       make
 93120   96400  36305      0  3    0x10008b  sigsusp       sh
 36305  514776   8546      0  3    0x10008b  sigsusp       make
  8546  238367   4692      0  3    0x10008b  sigsusp       sh
  4692  489660  26944      0  3    0x10008b  sigsusp       make
 26944  436341  48257      0  3    0x10008b  sigsusp       sh
 48257  314396  10008      0  3    0x10008b  sigsusp       make
 10008  435666  92084      0  3    0x10008b  sigsusp       ksh
 12176  217804      1    535  3        0x90  nanoslp       symon
 91118  143402  85218   1000  3    0x100083  ttyin         less
 85218   32061  56713   1000  3    0x100083  wait          man
  2224  468397  33721   1000  3    0x10008b  sigsusp       ksh
 92084   61154  33721   1000  3    0x10008b  sigsusp       ksh
 44638   23896  33721   1000  3    0x100083  ttyin         ksh
 56713  172890  33721   1000  3    0x10008b  sigsusp       ksh
 45369  407637  33721   1000  3    0x100083  ttyin         ksh
 33721  465132      1   1000  7    0x100000                tmux
  8101  517017  88882   1000  3    0x100083  kqread        tmux
 88882  142952  16959   1000  3    0x10008b  sigsusp       ksh
 16959  450958  19368   1000  3        0x98  kqread        sshd-session
 19368  298213  50108      0  3        0x92  kqread        sshd-session
 23309   95592      1      0  3    0x100083  ttyin         getty
 82503  389144      1      0  3    0x100083  ttyin         getty
 62647  227725      1      0  3    0x100083  ttyin         getty
 67173  236152      1      0  3    0x100083  ttyin         getty
  1995  482306      1      0  3    0x100083  ttyin         getty
 81825  183167      1      0  3    0x100083  ttyin         getty
 35746  309914      1      0  3    0x100098  kqread        cron
 85538  503030      1     99  3   0x1100090  kqread        sndiod
 41770  301621      1    110  3    0x100090  kqread        sndiod
 52659  113445   9460     95  3   0x1100092  kqread        smtpd
 84871    4209   9460    103  3   0x1100092  kqread        smtpd
 46725  297071   9460     95  3   0x1100092  kqread        smtpd
 35638   47706   9460     95  3    0x100092  kqread        smtpd
  3360  461965   9460     95  3   0x1100092  kqread        smtpd
 39214  299935   9460     95  3   0x1100092  kqread        smtpd
  9460   32231      1      0  3    0x100080  kqread        smtpd
 50108  473143      1      0  3        0x88  kqread        sshd
 49911  398998      1      0  3    0x100080  kqread        ntpd
 84795  239602  61042     83  3    0x100092  kqread        ntpd
 61042  125560      1     83  3   0x1100092  kqread        ntpd
 64801  344510  24162     74  3   0x1100092  bpf           pflogd
 24162  227361      1      0  3        0x80  sbwait        pflogd
 59846  185408  13198     73  3   0x1100090  kqread        syslogd
 13198  113275      1      0  3    0x100082  sbwait        syslogd
 55019  246978      1      0  3    0x100080  kqread        resolvd
 26130   10064  83350     77  3    0x100092  kqread        dhcpleased
 65979  299139  83350     77  3    0x100092  kqread        dhcpleased
 83350  165614      1      0  3        0x80  kqread        dhcpleased
 33193  435463    249    115  3    0x100092  kqread        slaacd
 23231  235380    249    115  3    0x100092  kqread        slaacd
   249  389535      1      0  3    0x100080  kqread        slaacd
 19173  429356      0      0  3     0x14200  bored         wsdisplay0
 74229  370575      0      0  3     0x14200  bored         drm_dp_mst_wq
 61134  429512      0      0  3     0x14200  bored         drm_dp_mst_wq
 83280  269401      0      0  3     0x14200  bored         drm_dp_mst_wq
 58320  264147      0      0  3     0x14200  bored         i915_flip
 65794  357044      0      0  3     0x14200  bored         i915_modeset
 13591  212683      0      0  3     0x14200  bored         card0-crtc2
 38863  424144      0      0  3     0x14200  bored         card0-crtc1
  1715   69990      0      0  3     0x14200  bored         card0-crtc0
 27880  105033      0      0  3     0x14200  bored         ttm
 92120  294135      0      0  3     0x14200  bored         i915-unordered
 10863  318237      0      0  3     0x14200  bored         i915-dp
 42648  327288      0      0  3     0x14200  bored         i915
 48711  115390      0      0  3     0x14200  bored         smr
 25743   89568      0      0  3     0x14200  pgzero        zerothread
 59568  357224      0      0  3     0x14200  aiodoned      aiodoned
 61293  370319      0      0  3     0x14200  syncer        update
 68589  145868      0      0  3     0x14200  cleaner       cleaner
 38839   82981      0      0  3     0x14200  reaper        reaper
 18794  380707      0      0  3     0x14200  pgdaemon      pagedaemon
 49918  491489      0      0  3     0x14200  mmctsk        sdmmc0
 98998  145422      0      0  3     0x14200  usbtsk        usbtask
 20272  164520      0      0  3     0x14200  usbatsk       usbatsk
 72677  365328      0      0  3     0x14200  bored         drmtskl
 89596  105410      0      0  3     0x14200  bored         drmlwq
  7943  158806      0      0  3     0x14200  bored         drmlwq
 23687  336616      0      0  3     0x14200  bored         drmlwq
 74020   84079      0      0  3     0x14200  bored         drmlwq
 30112  482723      0      0  3     0x14200  bored         drmubwq
 43191  326547      0      0  3     0x14200  bored         drmubwq
 34018   98690      0      0  3     0x14200  bored         drmubwq
 91067  291089      0      0  3     0x14200  bored         drmubwq
 31045   53920      0      0  3     0x14200  bored         drmhpwq
 45040  239782      0      0  3     0x14200  bored         drmhpwq
 72943  307284      0      0  3     0x14200  bored         drmhpwq
 95367  196853      0      0  3     0x14200  bored         drmhpwq
 89330   83856      0      0  3     0x14200  bored         drmwq
 75745  267234      0      0  3     0x14200  bored         drmwq
 56522  309431      0      0  3     0x14200  bored         drmwq
 93614  297251      0      0  3     0x14200  bored         drmwq
 98839  276590      0      0  3  0x40014200  acpi0         acpi0
 24381  138326      0      0  3  0x40014200                idle3
 30225  520432      0      0  7  0x40014200                idle2
 44511  321109      0      0  3  0x40014200                idle1
 33001  422903      0      0  3     0x14200  bored         sensors
  4207    7696      0      0  3     0x14200  bored         softnet3
 89839  457051      0      0  3     0x14200  bored         softnet2
 84812  518415      0      0  3     0x14200  bored         softnet1
 17082  228503      0      0  3     0x14200  bored         softnet0
 39579  145246      0      0  3     0x14200  bored         systqmp
  8553  161614      0      0  3     0x14200  bored         systq
 61077  200705      0      0  3     0x14200  tmoslp        softclockmp
 95001  264079      0      0  3  0x40014200  tmoslp        softclock
  9091  112029      0      0  7  0x40014200                idle0
     1  133931      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{1}> show registers
rdi                              0xa
rsi                             0x14
rbp               0xffff800048c0d000
rbx               0xfffffd847f167080
rdx               0xc000000000000000
rcx                            0x206
rax                             0x88
r8                 0x101010101010101
r9                                 0
r10               0xfd5ce01bea09a093
r11               0x3d6ec8ecb86c1db2
r12               0xffff800036843bb0
r13                    0x26d2a4d8000
r14                                0
r15               0xffffffff82547673    packet_length+0x5093
rip               0xffffffff81a7fe14    db_enter+0x14
cs                               0x8
rflags                         0x206
rsp               0xffff800048c0d000
ss                                 0
db_enter+0x14:  popq    %rbp

dmesg:
OpenBSD 7.7-current (GENERIC.MP) #708: Mon Jun  9 20:52:14 MDT 2025
    dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 16973451264 (16187MB)
avail mem = 16432336896 (15671MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 3.3 @ 0x76134000 (18 entries)
bios0: vendor 3mdeb version "Dasharo (coreboot+UEFI) v0.9.0" date 04/30/2025
bios0: Protectli VP2430
efi0 at bios0: UEFI 2.8
efi0: EDK II rev 0x10000
acpi0 at bios0: ACPI 6.0
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP SSDT MCFG TPM2 LPIT APIC SPCR DMAR HPET
acpi0: wakeup devices XHCI(S3) GLAN(S4) TXHC(S4) PXSX(S4) PXSX(S4) PXSX(S4) PXSX(S4)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimcfg0 at acpi0
acpimcfg0: addr 0xc0000000, bus 0-255
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 20, 120 pins
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) N150, 2893.33 MHz, 06-be-00, patch 0000001d
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=77fafbff<SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND>
cpu0: cpuid 6 eax=578ff7<SENSOR,ARAT> ecx=9<EFFFREQ>
cpu0: cpuid 7.0 ebx=239ca7eb<FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,CLFLUSHOPT,CLWB,PT,SHA> ecx=98c007ac<UMIP,PKU,WAITPKG,PKS> edx=fc184410<MD_CLEAR,IBT,IBRS,IBPB,STIBP,L1DF,SSBD>
cpu0: cpuid a vers=5, gp=6, gpwidth=48, ff=3, ffwidth=48
cpu0: cpuid d.1 eax=f<XSAVEOPT,XSAVEC,XGETBV1,XSAVES>
cpu0: cpuid 80000001 edx=2c100800<NXE,PAGE1GB,RDTSCP,LONG> ecx=121<LAHF,ABM,3DNOWP>
cpu0: cpuid 80000007 edx=100<ITSC>
cpu0: msr 10a=15c0fd6b<IBRS_ALL,SKIP_L1DFL,MDS_NO,IF_PSCHANGE,TAA_NO,MISC_PKG_CT,ENERGY_FILT,DOITM,SBDR_SSDP_N,FBSDP_NO,PSDP_NO,OVERCLOCK,PBRSB_NO,GDS_NO,RFDS_CLEAR> cpu0: 32KB 64b/line 8-way D-cache, 64KB 64b/line 8-way I-cache, 2MB 64b/line 16-way L2 cache, 6MB 64b/line 12-way L3 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 38MHz
cpu0: mwait min=64, max=64, C-substates=0.2.0.2.0.1.0.1, IBE
cpu1 at mainbus0: apid 2 (application processor)
cpu1: Intel(R) N150, 2893.33 MHz, 06-be-00, patch 0000001d
cpu1: smt 0, core 1, package 0
cpu2 at mainbus0: apid 4 (application processor)
cpu2: Intel(R) N150, 2893.33 MHz, 06-be-00, patch 0000001d
cpu2: smt 0, core 2, package 0
cpu3 at mainbus0: apid 6 (application processor)
cpu3: Intel(R) N150, 2893.33 MHz, 06-be-00, patch 0000001d
cpu3: smt 0, core 3, package 0
acpihpet0 at acpi0: 19200000 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 1 (RP01)
acpiprt2 at acpi0: bus -1 (RP02)
acpiprt3 at acpi0: bus 2 (RP03)
acpiprt4 at acpi0: bus 3 (RP04)
acpiprt5 at acpi0: bus -1 (RP05)
acpiprt6 at acpi0: bus -1 (RP06)
acpiprt7 at acpi0: bus 4 (RP07)
acpiprt8 at acpi0: bus -1 (RP08)
acpiprt9 at acpi0: bus 5 (RP09)
acpiprt10 at acpi0: bus -1 (RP10)
acpiprt11 at acpi0: bus -1 (RP11)
acpiprt12 at acpi0: bus -1 (RP12)
acpipci0 at acpi0 PCI0: 0x00000000 0x00000011 0x00000001
pchgpio0 at acpi0 GPIO addr 0xfd6e0000/0x10000 0xfd6d0000/0x10000 0xfd6a0000/0x10000 0xfd690000/0x10000 irq 14, 384 pins
acpicmos0 at acpi0
"PNP0A05" at acpi0 not configured
com0 at acpi0 SER1 addr 0x3f8/0x8 irq 4: ns16550a, 16 byte fifo
com0: console
com1 at acpi0 SER2 addr 0x2f8/0x8 irq 3: ns16550a, 16 byte fifo
"INT3515" at acpi0 not configured
"INTC1079" at acpi0 not configured
"INTC1026" at acpi0 not configured
"INTC105C" at acpi0 not configured
intelpmc0 at acpi0: PEPD
state 0: 0x7f:1:2:0x00:0x0000000000000060
counter: 0x7f:64:0:0x00:0x0000000000000632
frequency: 0
state 1: 0x7f:1:2:0x00:0x0000000000000060
counter: 0x00:32:0:0x03:0x00000000fe00193c
frequency: 0
acpicpu0 at acpi0: C3(200@260 mwait.1@0x40), C2(350@127 mwait.1@0x21), C1(1000@1 mwait.1), PSS acpicpu1 at acpi0: C3(200@260 mwait.1@0x40), C2(350@127 mwait.1@0x21), C1(1000@1 mwait.1), PSS acpicpu2 at acpi0: C3(200@260 mwait.1@0x40), C2(350@127 mwait.1@0x21), C1(1000@1 mwait.1), PSS acpicpu3 at acpi0: C3(200@260 mwait.1@0x40), C2(350@127 mwait.1@0x21), C1(1000@1 mwait.1), PSS
"BOOT0000" at acpi0 not configured
cpu0: using VERW MDS workaround
cpu0: Enhanced SpeedStep 2893 MHz: speeds: 801, 800, 700 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel N100 Host" rev 0x00
inteldrm0 at pci0 dev 2 function 0 "Intel Graphics" rev 0x00
drm0 at inteldrm0
inteldrm0: msi, ALDERLAKE_P, gen 12
xhci0 at pci0 dev 13 function 0 "Intel ADL-N xHCI" rev 0x00: msi, xHCI 1.20
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
xhci1 at pci0 dev 20 function 0 "Intel ADL-N xHCI" rev 0x00: msi, xHCI 1.20
usb1 at xhci1: USB revision 3.0
uhub1 at usb1 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 addr 1
"Intel ADL-N SRAM" rev 0x00 at pci0 dev 20 function 2 not configured
dwiic0 at pci0 dev 21 function 0 "Intel ADL-N I2C" rev 0x00: apic 0 int 37
iic0 at dwiic0
ahci0 at pci0 dev 23 function 0 "Intel ADL-N AHCI" rev 0x00: msi, AHCI 1.3.1
ahci0: PHY offline on port 0
scsibus1 at ahci0: 32 targets
dwiic1 at pci0 dev 25 function 0 "Intel ADL-N I2C" rev 0x00: apic 0 int 41
iic1 at dwiic1
"INT3515" at iic1 addr 0x27 not configured
sdhc0 at pci0 dev 26 function 0 "Intel ADL-N eMMC" rev 0x00: apic 0 int 23
sdhc0: SDHC 3.00, 200 MHz base clock
sdmmc0 at sdhc0: 8-bit, sd high-speed, mmc high-speed, ddr52, dma
ppb0 at pci0 dev 28 function 0 "Intel ADL-N PCIE" rev 0x00: msi
pci1 at ppb0 bus 1
igc0 at pci1 dev 0 function 0 "Intel I226-V" rev 0x04, msix, 4 queues, address 64:62:66:23:b9:a3
ppb1 at pci0 dev 28 function 2 "Intel ADL-N PCIE" rev 0x00: msi
pci2 at ppb1 bus 2
igc1 at pci2 dev 0 function 0 "Intel I226-V" rev 0x04, msix, 4 queues, address 64:62:66:23:b9:a4
ppb2 at pci0 dev 28 function 3 "Intel ADL-N PCIE" rev 0x00: msi
pci3 at ppb2 bus 3
igc2 at pci3 dev 0 function 0 "Intel I226-V" rev 0x04, msix, 4 queues, address 64:62:66:23:b9:a5
ppb3 at pci0 dev 28 function 6 "Intel ADL-N PCIE" rev 0x00: msi
pci4 at ppb3 bus 4
igc3 at pci4 dev 0 function 0 "Intel I226-V" rev 0x04, msix, 4 queues, address 64:62:66:23:b9:a6
ppb4 at pci0 dev 29 function 0 "Intel ADL-N PCIE" rev 0x00: msi
pci5 at ppb4 bus 5
nvme0 at pci5 dev 0 function 0 vendor "Kingston", unknown product 0x5028 rev 0x03: msix, NVMe 1.4
nvme0: KINGSTON SNV3S500G, firmware SDQ00103, serial 50026B7785D44D4F
scsibus2 at nvme0: 2 targets, initiator 0
sd0 at scsibus2 targ 1 lun 0: <NVMe, KINGSTON SNV3S50, SDQ0>
sd0: 476940MB, 512 bytes/sector, 976773168 sectors
pcib0 at pci0 dev 31 function 0 "Intel ADL-N eSPI" rev 0x00
azalia0 at pci0 dev 31 function 3 "Intel ADL-N HD Audio" rev 0x00: msi
azalia0: no HD-Audio codecs
ichiic0 at pci0 dev 31 function 4 "Intel ADL-N SMBus" rev 0x00: apic 0 int 20
iic2 at ichiic0
iic2: addr 0x48 15=2c 16=20 19=04 1b=05 1c=60 1e=60 1f=60 20=89 21=78 22=63 25=78 26=63 27=78 28=63 29=90 2a=9a 2b=42 2c=20 2d=22 2e=04 2f=5a 32=80 34=0e 3b=12 3c=8a 3d=8c words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000
"eeprom" at iic2 addr 0x50 not configured
"Intel ADL-N SPI" rev 0x00 at pci0 dev 31 function 5 not configured
isa0 at pcib0
isadma0 at isa0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
vmm0 at mainbus0: VMX/EPT
efifb at mainbus0 not configured
sdmmc0: can't re-read EXT_CSD
sdmmc0: mem init failed
scsibus3 at sdmmc0: 2 targets, initiator 0
sd1 at scsibus3 targ 1 lun 0: <Samsung, BJTD4R, 0000> removable
sd1: 1024MB, 512 bytes/sector, 2097152 sectors
vscsi0 at root
scsibus4 at vscsi0: 256 targets
softraid0 at root
scsibus5 at softraid0: 256 targets
root on sd0a (a7ad2b2a188c8680.a) swap on sd0b dump on sd0b
WARNING: / was not properly unmounted
inteldrm0: 1024x768, 32bpp
wsdisplay0 at inteldrm0 mux 1
wsdisplay0: screen 0-5 added (std, vt100 emulation)

usbdevs:
Controller /dev/usb0:
addr 01: 8086:0000 Intel, xHCI root hub
         super speed, self powered, config 1, rev 1.00
         driver: uhub0
Controller /dev/usb1:
addr 01: 8086:0000 Intel, xHCI root hub
         super speed, self powered, config 1, rev 1.00
         driver: uhub1

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