panic: acquiring blockable sleep lock with spinlock or critical section held (kernel_lock) &kernel_lock Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 43234 45127 0 0 0x4000000 0 syz-executor.2 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff825a2db5) at panic+0x177 sys/kern/subr_prf.c:202 witness_checkorder(ffffffff829f3ad8,9,0) at witness_checkorder+0x116d sys/kern/subr_witness.c:833 __mp_lock(ffffffff829f38d0) at __mp_lock+0xa1 read_rflags machine/cpufunc.h:195 [inline] __mp_lock(ffffffff829f38d0) at __mp_lock+0xa1 intr_disable machine/cpufunc.h:216 [inline] __mp_lock(ffffffff829f38d0) at __mp_lock+0xa1 sys/kern/kern_lock.c:142 selwakeup(fffffd80784bc380) at selwakeup+0x16 klist_empty sys/sys/event.h:361 [inline] selwakeup(fffffd80784bc380) at selwakeup+0x16 sys/kern/sys_generic.c:885 sorwakeup(fffffd80784bc268) at sorwakeup+0xc9 sys/kern/uipc_socket.c:1699 rip_input(ffff80002e39fbe8,ffff80002e39fbf4,0,2) at rip_input+0x3b0 sys/netinet/raw_ip.c:188 ip_deliver(ffff80002e39fbe8,ffff80002e39fbf4,0,2) at ip_deliver+0x322 sys/netinet/ip_input.c:657 ip_ours(ffff80002e39fbe8,ffff80002e39fbf4,0,0) at ip_ours+0x3ba sys/netinet/ip_input.c:616 ip_input_if(ffff80002e39fbe8,ffff80002e39fbf4,4,0,ffff80000019f2a8) at ip_input_if+0x2a1 ipv4_input(ffff80000019f2a8,fffffd80664e2300) at ipv4_input+0x48 sys/netinet/ip_input.c:242 if_input_local(ffff80000019f2a8,fffffd80664e2300,2) at if_input_local+0x10e sys/net/if.c:774 ether_resolve(ffff80000019f2a8,fffffd80744a4400,fffffd806f685f28,fffffd806f37e000,ffff80002e39fd38) at ether_resolve+0x4ac sys/net/if_ethersubr.c:242 ether_output(ffff80000019f2a8,fffffd80744a4400,fffffd806f685f28,fffffd806f37e000) at ether_output+0x47 ether_encap sys/net/if_ethersubr.c:324 [inline] ether_output(ffff80000019f2a8,fffffd80744a4400,fffffd806f685f28,fffffd806f37e000) at ether_output+0x47 sys/net/if_ethersubr.c:353 end trace frame: 0xffff80002e39feb0, count: 0 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs.