panic: kernel diagnostic assertion "_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_device.c", line 230 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *207328 1995 0 0 0x4000000 1 syz-executor.1 415651 26211 0 0x2 0x4000480 0 syz-fuzzer db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff824502ee) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff824bffea,ffffffff824476b7,e6,ffffffff824ce6c6) at __assert+0x25 sys/kern/subr_prf.c:161 udv_reference(ffff800000b0d6c0) at udv_reference+0x84 sys/uvm/uvm_device.c:230 uvm_mapent_clone(fffffd807f008170,2000,1fe000,0,7,7) at uvm_mapent_clone+0x1a2 sys/uvm/uvm_map.c:3810 uvm_share(fffffd807f008170,0,7,fffffd807f008730,20000000,200000) at uvm_share+0x45c uvm_mapent_share sys/uvm/uvm_map.c:3840 [inline] uvm_share(fffffd807f008170,0,7,fffffd807f008730,20000000,200000) at uvm_share+0x45c sys/uvm/uvm_map.c:3739 vm_impl_init_vmx(ffff8000212975e0,ffff800021216a80) at vm_impl_init_vmx+0xb4 sys/arch/amd64/amd64/vmm.c:1591 vm_create(ffff800000b7a800,ffff800021216a80) at vm_create+0x19b vm_impl_init sys/arch/amd64/amd64/vmm.c:1690 [inline] vm_create(ffff800000b7a800,ffff800021216a80) at vm_create+0x19b sys/arch/amd64/amd64/vmm.c:1510 vmmioctl(a00,c5005601,ffff800000b7a800,1,ffff800021216a80) at vmmioctl+0x1f2 VOP_IOCTL(fffffd806e3e43d0,c5005601,ffff800000b7a800,1,fffffd807f7d8720,ffff800021216a80) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295 vn_ioctl(fffffd8066ffc318,c5005601,ffff800000b7a800,ffff800021216a80) at vn_ioctl+0xba sys/kern/vfs_vnops.c:531 sys_ioctl(ffff800021216a80,ffff800022cbf488,ffff800022cbf4d0) at sys_ioctl+0x4a2 syscall(ffff800022cbf550) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800022cbf550) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x32c45bd3d70, count: 1 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs.