panic: ifa_update_broadaddr does not support dynamic length Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *181116 6723 0 0x8000000 0x4000000 1K syz-executor.4 475335 46547 0 0x8000002 0 0 syz-executor.2 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8285b3fa) at panic+0x17b sys/kern/subr_prf.c:198 ifa_update_broadaddr(ffff800000e66000,ffff800000e65a00,ffff80002a2135a0) at ifa_update_broadaddr+0x6a sys/net/if.c:3315 in_ioctl(80206913,ffff80002a213590,ffff800000e66000,1) at in_ioctl+0x5cf sys/netinet/in.c:313 ifioctl(ffff800000ee8018,80206913,ffff80002a213590,ffff80003738ad00) at ifioctl+0x106c pru_control sys/sys/protosw.h:378 [inline] ifioctl(ffff800000ee8018,80206913,ffff80002a213590,ffff80003738ad00) at ifioctl+0x106c sys/net/if.c:2449 sys_ioctl(ffff80003738ad00,ffff80002a213770,ffff80002a2136c0) at sys_ioctl+0x4a9 syscall(ffff80002a213770) at syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] syscall(ffff80002a213770) at syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa6e39d309d0, 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.