panic: mallocarray: overflow 18446744071562067968 * 8 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *361887 70997 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x15c sys/kern/subr_prf.c:208 intel_init_audio(ffffffff80000000) at intel_init_audio wsmux_getmux(7fffffff) at wsmux_getmux+0x71 sys/dev/wscons/wsmux.c:152 wsmux_add_mux(7fffffff,ffff800004d3f100) at wsmux_add_mux+0x2f sys/dev/wscons/wsmux.c:594 VOP_IOCTL(fffffd802eab6058,80085761,ffff800014934e30,f,fffffd803f7c6960,ffff8000ffff9070) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd803bf45d28,80085761,ffff800014934e30,ffff8000ffff9070) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff8000ffff9070,ffff800014934f78,ffff800014934f60) at sys_ioctl+0x638 syscall(ffff800014935010) at syscall+0x541 Xsyscall(6,0,ffffffffffffff86,0,3,42e8db68010) at Xsyscall+0x128 end of kernel end trace frame: 0x43152f320a0, count: 5 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs.