panic: receive 3: so 0xffffff007eb4ec20, so_type 1, m 0xffffff006d8d1900, m_type 6 Stopped at db_enter+0xa: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND *277294 65255 65534 0x10 0x4000000 1K syz-executor0 481366 65255 65534 0x10 0x4000000 0 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,ffffff007eb4ec20,ffff8000211b0ee0,10f6,ffff8000211b0f70,ffffff007eb4ec20) at soreceive+0x12d8 sys/kern/uipc_socket.c:933 recvit(ffff8000211b0fa0,ffff8000211b10a8,ffff8000211b1090,ffff8000210a39e0,0) at recvit+0x28d sys/kern/uipc_syscalls.c:822 sys_recvmsg(1b0,ffff8000210a39e0,1) 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,ffffffffffffffc1,0,3,98b07035010) at Xsyscall+0x128 end of kernel end trace frame: 0x98da6e16e30, 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 0xffffff007eb4ec20, so_type 1, m 0xffffff006d8d1900, 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,ffffff007eb4ec20,ffff8000211b0ee0,10f6,ffff8000211b0f70,ffffff007eb4ec20) at soreceive+0x12d8 sys/kern/uipc_socket.c:933 recvit(ffff8000211b0fa0,ffff8000211b10a8,ffff8000211b1090,ffff8000210a39e0,0) at recvit+0x28d sys/kern/uipc_syscalls.c:822 sys_recvmsg(1b0,ffff8000210a39e0,1) 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,ffffffffffffffc1,0,3,98b07035010) at Xsyscall+0x128 end of kernel end trace frame: 0x98da6e16e30, count: -7 ddb{1}> show registers rdi 0xffffffff81e337f8 kprintf_mutex rsi 0xffffffff81696879 db_enter+0x9 rbp 0xffff8000211b0d30 rbx 0xffff8000211b0dd0 rdx 0xffff800000ad6000 rcx 0x1fe3 __ALIGN_SIZE+0xfe3 rax 0xffff800000ad6000 r8 0xffff8000211b0d00 r9 0x1 r10 0 r11 0xffffffff8181f470 x86_bus_space_io_read_1 r12 0x3000000008 r13 0xffff8000211b0d40 r14 0x100 r15 0xffffffff81bdc2ec cmd0646_9_tim_udma+0x65fa rip 0xffffffff8169687a db_enter+0xa cs 0x8 rflags 0x202 rsp 0xffff8000211b0d30 ss 0x10 db_enter+0xa: popq %rbp ddb{1}> show proc PROC (syz-executor0) pid=277294 stat=onproc flags process=10 proc=4000000 pri=24, usrpri=74, nice=20 forw=0xffffffffffffffff, list=0xffff8000210a3c38,0xffff8000210a2be0 process=0xffff8000210b6cb8 user=0xffff8000211ac000, vmspace=0xffffff0064e00018 estcpu=24, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 65255 352399 44242 65534 2 0x10 syz-executor0 *65255 277294 44242 65534 7 0x4000010 syz-executor0 65255 230663 44242 65534 2 0x4000010 syz-executor0 65255 481366 44242 65534 7 0x4000010 syz-executor0 46862 93893 47292 65534 3 0x90 piperd syz-executor1 47292 39978 38534 0 3 0x82 wait syz-executor1 44242 243804 41139 65534 3 0x90 nanosleep syz-executor0 41139 309177 38534 0 3 0x82 wait syz-executor0 85793 157827 0 0 3 0x14200 bored sosplice 38534 78278 1215 0 3 0x82 thrsleep syz-fuzzer 38534 301321 1215 0 3 0x4000082 thrsleep syz-fuzzer 38534 452416 1215 0 3 0x4000082 thrsleep syz-fuzzer 38534 166046 1215 0 3 0x4000082 thrsleep syz-fuzzer 38534 21560 1215 0 3 0x4000082 thrsleep syz-fuzzer 38534 235151 1215 0 3 0x4000082 thrsleep syz-fuzzer 38534 115445 1215 0 3 0x4000082 thrsleep syz-fuzzer 38534 68402 1215 0 3 0x4000082 thrsleep syz-fuzzer 38534 458639 1215 0 3 0x4000082 thrsleep syz-fuzzer 38534 327604 1215 0 3 0x4000082 kqread syz-fuzzer 38534 158241 1215 0 3 0x4000082 thrsleep syz-fuzzer 38534 374731 1215 0 3 0x4000082 thrsleep syz-fuzzer 1215 349765 49549 0 3 0x10008a pause ksh 49549 386951 95782 0 3 0x92 select sshd 25392 85339 1 0 3 0x100083 ttyin getty 95782 427391 1 0 3 0x80 select sshd 68278 59904 48102 73 3 0x100090 kqread syslogd 48102 144676 1 0 3 0x100082 netio syslogd 514 389661 1 77 3 0x100090 poll dhclient 79901 431718 1 0 3 0x80 poll dhclient 97449 427529 0 0 3 0x14200 pgzero zerothread 55473 226061 0 0 3 0x14200 aiodoned aiodoned 97159 73108 0 0 3 0x14200 syncer update 295 368504 0 0 3 0x14200 cleaner cleaner 73596 33584 0 0 3 0x14200 reaper reaper 99658 172041 0 0 3 0x14200 pgdaemon pagedaemon 49008 38708 0 0 3 0x14200 bored crynlk 77745 297287 0 0 3 0x14200 bored crypto 49404 269458 0 0 3 0x40014200 acpi0 acpi0 39058 516129 0 0 3 0x40014200 idle1 29348 206617 0 0 3 0x14200 bored softnet 48900 876 0 0 3 0x14200 bored systqmp 26733 311917 0 0 3 0x14200 bored systq 61885 54296 0 0 3 0x40014200 bored softclock 37477 291226 0 0 3 0x40014200 idle0 1 404202 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper