panic: receive 3: so 0xffffff007b7b3968, so_type 1, m 0xffffff006d8f0a00, m_type 6 Stopped at db_enter+0xa: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND 521684 11222 65534 0x10 0 0 syz-executor0 * 48731 11222 65534 0x10 0x4000000 1K syz-executor0 db_enter() at db_enter+0xa sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x147 sys/kern/subr_prf.c:208 soreceive(0,ffffff007b7b3968,ffff800021178ee0,120d,ffff800021178f70,ffffff007b7b3968) at soreceive+0x12d8 sys/kern/uipc_socket.c:933 recvit(ffff800021178fa0,ffff8000211790a8,ffff800021179090,ffff8000210a24c8,0) at recvit+0x28d sys/kern/uipc_syscalls.c:822 sys_recvmsg(1b0,ffff8000210a24c8,1) at sys_recvmsg+0x120 sys/kern/uipc_syscalls.c:758 syscall(0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffffc1,0,3,3782db2a010) at Xsyscall+0x128 end of kernel end trace frame: 0x37a755a1e90, count: 8 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> show panic receive 3: so 0xffffff007b7b3968, so_type 1, m 0xffffff006d8f0a00, m_type 6 ddb{1}> trace db_enter() at db_enter+0xa sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x147 sys/kern/subr_prf.c:208 soreceive(0,ffffff007b7b3968,ffff800021178ee0,120d,ffff800021178f70,ffffff007b7b3968) at soreceive+0x12d8 sys/kern/uipc_socket.c:933 recvit(ffff800021178fa0,ffff8000211790a8,ffff800021179090,ffff8000210a24c8,0) at recvit+0x28d sys/kern/uipc_syscalls.c:822 sys_recvmsg(1b0,ffff8000210a24c8,1) at sys_recvmsg+0x120 sys/kern/uipc_syscalls.c:758 syscall(0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffffc1,0,3,3782db2a010) at Xsyscall+0x128 end of kernel end trace frame: 0x37a755a1e90, count: -7 ddb{1}> show registers rdi 0xffffffff81e337f8 kprintf_mutex rsi 0xffffffff81696879 db_enter+0x9 rbp 0xffff800021178d30 rbx 0xffff800021178dd0 rdx 0xffff800001ed7000 rcx 0x24cf __ALIGN_SIZE+0x14cf rax 0xffff800001ed7000 r8 0xffff800021178d00 r9 0x1 r10 0 r11 0xffffffff8181f470 x86_bus_space_io_read_1 r12 0x3000000008 r13 0xffff800021178d40 r14 0x100 r15 0xffffffff81bdc2ec cmd0646_9_tim_udma+0x65fa rip 0xffffffff8169687a db_enter+0xa cs 0x8 rflags 0x206 rsp 0xffff800021178d30 ss 0x10 db_enter+0xa: popq %rbp ddb{1}> show proc PROC (syz-executor0) pid=48731 stat=onproc flags process=10 proc=4000000 pri=24, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff8000210a3080,0xffff8000210a2028 process=0xffff8000210b7630 user=0xffff800021174000, vmspace=0xffffff0065b61008 estcpu=28, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 11222 521684 14076 65534 7 0x10 syz-executor0 *11222 48731 14076 65534 7 0x4000010 syz-executor0 11222 179203 14076 65534 3 0x4000090 fsleep syz-executor0 11222 323481 14076 65534 2 0x4000010 syz-executor0 89894 280444 75090 65534 3 0x90 piperd syz-executor1 75090 282662 13149 0 3 0x82 wait syz-executor1 14076 80091 40599 65534 3 0x90 nanosleep syz-executor0 40599 355716 13149 0 3 0x82 wait syz-executor0 50526 324449 0 0 3 0x14200 bored sosplice 13149 200260 4649 0 3 0x82 thrsleep syz-fuzzer 13149 125819 4649 0 3 0x4000082 thrsleep syz-fuzzer 13149 230151 4649 0 3 0x4000082 thrsleep syz-fuzzer 13149 227809 4649 0 3 0x4000082 thrsleep syz-fuzzer 13149 283688 4649 0 3 0x4000082 thrsleep syz-fuzzer 13149 200955 4649 0 3 0x4000082 thrsleep syz-fuzzer 13149 139105 4649 0 3 0x4000082 thrsleep syz-fuzzer 13149 70928 4649 0 3 0x4000082 thrsleep syz-fuzzer 13149 170519 4649 0 3 0x4000082 thrsleep syz-fuzzer 13149 482957 4649 0 3 0x4000082 kqread syz-fuzzer 13149 221521 4649 0 3 0x4000082 thrsleep syz-fuzzer 13149 277828 4649 0 3 0x4000082 thrsleep syz-fuzzer 4649 147926 30184 0 3 0x10008a pause ksh 30184 422934 36983 0 3 0x92 select sshd 85412 449362 1 0 3 0x100083 ttyin getty 36983 478379 1 0 3 0x80 select sshd 67414 349143 87318 73 3 0x100090 kqread syslogd 87318 25464 1 0 3 0x100082 netio syslogd 51967 234058 1 77 3 0x100090 poll dhclient 39487 400526 1 0 3 0x80 poll dhclient 77144 445327 0 0 3 0x14200 pgzero zerothread 97175 381311 0 0 3 0x14200 aiodoned aiodoned 66378 523883 0 0 3 0x14200 syncer update 52407 461900 0 0 3 0x14200 cleaner cleaner 59060 278313 0 0 3 0x14200 reaper reaper 8244 346818 0 0 3 0x14200 pgdaemon pagedaemon 26440 235016 0 0 3 0x14200 bored crynlk 18806 427711 0 0 3 0x14200 bored crypto 7534 192303 0 0 3 0x40014200 acpi0 acpi0 80756 294424 0 0 3 0x40014200 idle1 45839 326789 0 0 3 0x14200 bored softnet 35077 187174 0 0 3 0x14200 bored systqmp 72790 274068 0 0 3 0x14200 bored systq 82868 405744 0 0 3 0x40014200 bored softclock 45095 23796 0 0 3 0x40014200 idle0 1 194659 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper