panic: malloc: allocation too large, type = 2, size = 18446744073709551296 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 118916 8161 0 0 0 0 syz-executor.1 *484363 8161 0 0 0x4000000 1K syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 malloc(fffffffffffffec0,2,a) at malloc+0x9c9 sys/kern/kern_malloc.c:344 vm_get_info(ffff800022bc5c30) at vm_get_info+0x9d VOP_IOCTL(fffffd806e1e29c0,c0185603,ffff800022bc5c30,81,fffffd807f7c6840,ffff800020acfb48) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:291 vn_ioctl(fffffd8063664278,c0185603,ffff800022bc5c30,ffff800020acfb48) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020acfb48,ffff800022bc5d48,ffff800022bc5d90) at sys_ioctl+0x5b9 syscall(ffff800022bc5e10) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022bc5e10) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff53,0,3,911b6b2e0e0) at Xsyscall+0x128 end of kernel end trace frame: 0x914a67eba50, count: 6 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs.