panic: mallocarray: overflow 18446744071562067968 * 8
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*474719  30594      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,ffff800000669100) at wsmux_add_mux+0x2f sys/dev/wscons/wsmux.c:594
VOP_IOCTL(fffffd80393f9718,80085761,ffff800014a143c0,83,fffffd803f7c6ae0,ffff8000ffff84b8) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
vn_ioctl(fffffd80361afd28,80085761,ffff800014a143c0,ffff8000ffff84b8) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
sys_ioctl(ffff8000ffff84b8,ffff800014a14508,ffff800014a144f0) at sys_ioctl+0x638
syscall(ffff800014a145a0) at syscall+0x541
Xsyscall(6,0,ffffffffffffff86,0,3,8c2c8db010) at Xsyscall+0x128
end of kernel
end trace frame: 0x8ee81c0ea0, 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.