The following will trigger "panic: rw_enter: netlock locking against myself":
# cat /etc/vm.conf vm "debian" { memory 2G disk "/home/vm/debian.img" cdrom "/home/vm/debian-9.4.0-amd64-netinst.iso" local interface } # rcctl enable vmd # rcctl start vmd # vmctl status ID PID VCPUS MAXMEM CURMEM TTY OWNER NAME 1 33559 1 2.0G 3.6M ttyp0 root debian # ifconfig tap0 tap0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 lladdr fe:e1:ba:d0:7a:c7 description: vm1-if0-debian index 6 priority 0 llprio 3 groups: tap status: active inet 100.64.1.2 netmask 0xfffffffe # tcpdump -n -i tap0 Leave tcpdump running, and in another window, run: # vmctl stop 1 (transcribed manually, beware of typos) panic: rw_enter: netlock locking against myself Stopped at db_enter+0x5: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND 44878 64568 107 0x100012 0 1 vmd 1744665 23678 0 0x14000 0x200 2 reaper 81345 40767 0 0x14000 0x200 3 softnet db_enter() at db_enter+0x5 panic() at panic+0x129 __rw_enter(ffff800000a19600,fff800000a19608) at _rw_enter+0x294 bpf_detachd(ffff800000a19608) at bpf_detachd+0x111 bpfclose(ffffff010b9b3aa8,ffffff010b9b3aa8,ffffffff81782b0cffff80000330233b0) at bpfclose+0x6c spec_close(ffff800032fc0fd9) at spec_close+0x1ca VOP_CLOSE(ffffff010b9b3aa88,d715901652e2c32,ffff800032fc0fd8,ffffffffffffffff) at VOP_CLOSE+0x3e vlcean(ffff800032fc0fd8,ffffff010b9b3aa8,1700) at vclean+0x99 vgonel(ffffff010b9b3aa8,ffff8000009c96c0) at vgonel+0x26 vop_generic_revoke(300) at vop_generic_revoke+0xf2 VOP_REVOKE(d715901652e2c32,ffffffff000000001) at VOP_REVOKE+31 vdevgone(fff8000009efa80,ffffffff81b6df48,ffff800000009efa88,17) at vdevgone+0xa bpfdetach(0) at bpfdetach+0xa5 if_detach(ffff8000000a03800) at if_detach+0xde end trace frame: 0xffff80000330235b0, count: 0 OpenBSD 6.3 (GENERIC.MP) #315: Mon Mar 19 14:44:50 CET 2018 s...@len.stsp.name:/usr/src/sys/arch/amd64/compile/GENERIC.MP real mem = 4156157952 (3963MB) avail mem = 4023066624 (3836MB) mpath0 at root scsibus0 at mpath0: 256 targets mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.6 @ 0xdae9c000 (64 entries) bios0: vendor LENOVO version "8DET69WW (1.39 )" date 07/18/2013 bios0: LENOVO 4291FY7 acpi0 at bios0: rev 2 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, 2492.31 MHz 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,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,IBRS,IBPB,STIBP,SENSOR,ARAT,MELTDOWN cpu0: 256KB 64b/line 8-way L2 cache acpihpet0: recalibrated TSC frequency 2491915373 Hz 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=0.2.1.1.2, IBE cpu1 at mainbus0: apid 1 (application processor) cpu1: Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz, 2491.91 MHz 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,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,IBRS,IBPB,STIBP,SENSOR,ARAT,MELTDOWN cpu1: 256KB 64b/line 8-way L2 cache cpu1: smt 1, core 0, package 0 cpu2 at mainbus0: apid 2 (application processor) cpu2: Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz, 2491.91 MHz 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,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,IBRS,IBPB,STIBP,SENSOR,ARAT,MELTDOWN cpu2: 256KB 64b/line 8-way L2 cache cpu2: smt 0, core 1, package 0 cpu3 at mainbus0: apid 3 (application processor) cpu3: Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz, 2491.91 MHz 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,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,IBRS,IBPB,STIBP,SENSOR,ARAT,MELTDOWN cpu3: 256KB 64b/line 8-way L2 cache cpu3: smt 1, core 1, package 0 ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins acpimcfg0 at acpi0 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) 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: critical temperature is 99 degC acpibtn0 at acpi0: LID_ acpibtn1 at acpi0: SLPB "LEN0020" at acpi0 not configured acpibat0 at acpi0: BAT0 model "42T4861" serial 28495 type LION oem "SANYO" acpiac0 at acpi0: AC unit online acpithinkpad0 at acpi0 "PNP0C14" at acpi0 not configured "PNP0C14" at acpi0 not configured acpidock0 at acpi0: GDCK not docked (0) acpivideo0 at acpi0: VID_ acpivout at acpivideo0 not configured acpivideo1 at acpi0: VID_ cpu0: Enhanced SpeedStep 2492 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 inteldrm0: 1280x768, 32bpp wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation) wsdisplay0: screen 1-5 added (std, vt100 emulation) "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 xx:xx:xx:xx:xx:xx 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 rtwn0 at pci2 dev 0 function 0 "Realtek 8188CE" rev 0x01: msi rtwn0: MAC/BB RTL8188CE, RF 6052 1T1R, address xx:xx:xx:xx:xx:xx 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: apic 2 int 16 sdhc0: SDHC 3.0, 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: 6.0Gb/s ahci0: port 2: 3.0Gb/s scsibus1 at ahci0: 32 targets sd0 at scsibus1 targ 0 lun 0: <ATA, Samsung SSD 850, EMT0> SCSI3 0/direct fixed naa.5002538d41097a1f sd0: 476940MB, 512 bytes/sector, 976773168 sectors, thin sd1 at scsibus1 targ 2 lun 0: <ATA, PLEXTOR PX-64M6M, 1.01> SCSI3 0/direct fixed naa.500230310019c0eb sd1: 61057MB, 512 bytes/sector, 125045424 sectors, thin ichiic0 at pci0 dev 31 function 3 "Intel 6 Series SMBus" rev 0x04: apic 2 int 18 iic0 at ichiic0 spdmem0 at iic0 addr 0x50: 2GB DDR3 SDRAM PC3-10600 SO-DIMM spdmem1 at iic0 addr 0x51: 2GB 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, using wsdisplay0 pms0 at pckbc0 (aux slot) wsmouse0 at pms0 mux 0 wsmouse1 at pms0 mux 0 pms0: Synaptics clickpad, firmware 8.0, 0x1e2b1 0x940300 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 uvideo0 at uhub2 port 6 configuration 1 interface 0 "Ricoh Company Ltd. Integrated Camera" rev 2.00/80.29 addr 3 video0 at uvideo0 uhub3 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.00 addr 2 vscsi0 at root scsibus2 at vscsi0: 256 targets softraid0 at root scsibus3 at softraid0: 256 targets softraid0: sd2 was not shutdown properly sd2 at scsibus3 targ 1 lun 0: <OPENBSD, SR CRYPTO, 006> SCSI2 0/direct fixed sd2: 61051MB, 512 bytes/sector, 125033303 sectors root on sd2a (68f533b8bd962947.a) swap on sd2b dump on sd2b WARNING: / was not properly unmounted