panic: spl assertion failure in yield Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *338609 85081 0 0 0x4000000 0K syz-executor.0 426234 70949 0 0 0 1 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8246aab3) at panic+0x15c sys/kern/subr_prf.c:207 splassert_fail(0,1,ffffffff8243d8ff) at splassert_fail+0x102 sys/kern/subr_prf.c:237 yield() at yield+0x77 sys/kern/sched_bsd.c:304 malloc(d8,9,9) at malloc+0xa4 sys/kern/kern_malloc.c:183 in6_update_ifa(ffff800000ac3000,ffff8000241d3250,0) at in6_update_ifa+0xb46 sys/netinet6/in6.c:643 in6_ioctl_change_ifaddr(8080691a,ffff8000241d3250,ffff800000ac3000) at in6_ioctl_change_ifaddr+0x40c sys/netinet6/in6.c:352 ifioctl(fffffd806c8f6650,8080691a,ffff8000241d3250,ffff800024117888) at ifioctl+0xe70 sys/net/if.c:2288 soo_ioctl(fffffd8067faedc0,8080691a,ffff8000241d3250,ffff800024117888) at soo_ioctl+0x27c sys/kern/sys_socket.c:138 sys_ioctl(ffff800024117888,ffff8000241d3368,ffff8000241d33b0) at sys_ioctl+0x4a5 syscall(ffff8000241d3430) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000241d3430) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd6fa9410c20, count: 3 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs.