panic: ifa_update_broadaddr does not support dynamic length Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *233943 77273 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 ifa_update_broadaddr(ffff800000b07800,ffff800000ab3500,ffff800017b1e6a0) at ifa_update_broadaddr+0x61 sys/net/if.c:2970 in_ioctl(80206913,ffff800017b1e690,ffff800000b07800,1) at in_ioctl+0x463 sys/netinet/in.c:311 ifioctl(fffffd80363ccd88,80206913,ffff800017b1e690,ffff8000ffff3160) at ifioctl+0xb34 sys/net/if.c:2202 sys_ioctl(ffff8000ffff3160,ffff800017b1e7a8,ffff800017b1e7f0) at sys_ioctl+0x5b9 syscall(ffff800017b1e870) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff36,0,3,6f69de91010) at Xsyscall+0x128 end of kernel end trace frame: 0x6f95c7c42a0, count: 7 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs.