panic: receive 3: so 0xffffff0066eab690, so_type 1, m 0xffffff007ba18100, m_type 6 Stopped at db_enter+0xa: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND 161116 46473 65534 0x10 0 0 syz-executor1 * 15423 46473 65534 0x10 0x4000000 1K syz-executor1 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,ffffff0066eab690,ffff8000211cd330,b,ffff8000211cd3c0,ffffff0066eab690) at soreceive+0x12d8 sys/kern/uipc_socket.c:933 recvit(ffff8000211cd3f0,ffff8000211cd4f8,ffff8000211cd4e0,ffff800021084710,0) at recvit+0x28d sys/kern/uipc_syscalls.c:822 sys_recvmsg(1b0,ffff800021084710,1) 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,ffffffffffffffc1,0,3,801e94f5010) at Xsyscall+0x128 end of kernel end trace frame: 0x803ffed7960, 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 0xffffff0066eab690, so_type 1, m 0xffffff007ba18100, 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,ffffff0066eab690,ffff8000211cd330,b,ffff8000211cd3c0,ffffff0066eab690) at soreceive+0x12d8 sys/kern/uipc_socket.c:933 recvit(ffff8000211cd3f0,ffff8000211cd4f8,ffff8000211cd4e0,ffff800021084710,0) at recvit+0x28d sys/kern/uipc_syscalls.c:822 sys_recvmsg(1b0,ffff800021084710,1) 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,ffffffffffffffc1,0,3,801e94f5010) at Xsyscall+0x128 end of kernel end trace frame: 0x803ffed7960, count: -7 ddb{1}> show registers rdi 0xffffffff81e53648 kprintf_mutex rsi 0xffffffff81711a99 db_enter+0x9 rbp 0xffff8000211cd180 rbx 0xffff8000211cd220 rdx 0xffff8000042de000 rcx 0x2513 __ALIGN_SIZE+0x1513 rax 0xffff8000042de000 r8 0xffff8000211cd150 r9 0x1 r10 0 r11 0xffffffff811c6fd0 x86_bus_space_io_read_1 r12 0x3000000008 r13 0xffff8000211cd190 r14 0x100 r15 0xffffffff81bdb0e7 cmd0646_9_tim_udma+0x27ed rip 0xffffffff81711a9a db_enter+0xa cs 0x8 rflags 0x202 rsp 0xffff8000211cd180 ss 0x10 db_enter+0xa: popq %rbp ddb{1}> show proc PROC (syz-executor1) pid=15423 stat=onproc flags process=10 proc=4000000 pri=24, usrpri=74, nice=20 forw=0xffffffffffffffff, list=0xffff800021084bc0,0xffff8000210859e0 process=0xffff8000210b6340 user=0xffff8000211c8000, vmspace=0xffffff00657f1320 estcpu=24, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 46473 161116 41288 65534 7 0x10 syz-executor1 *46473 15423 41288 65534 7 0x4000010 syz-executor1 46473 165984 41288 65534 3 0x4000090 netlck syz-executor1 46473 438163 41288 65534 2 0x4000010 syz-executor1 41288 154358 94364 65534 3 0x90 nanosleep syz-executor1 94364 174477 936 0 3 0x82 wait syz-executor1 42511 130834 0 0 3 0x14200 bored sosplice 936 346526 37142 0 3 0x82 thrsleep syz-fuzzer 936 213633 37142 0 3 0x4000082 thrsleep syz-fuzzer 936 118492 37142 0 3 0x4000082 thrsleep syz-fuzzer 936 95044 37142 0 3 0x4000082 thrsleep syz-fuzzer 936 179986 37142 0 3 0x4000082 thrsleep syz-fuzzer 936 106033 37142 0 3 0x4000082 thrsleep syz-fuzzer 936 418974 37142 0 3 0x4000082 thrsleep syz-fuzzer 936 2627 37142 0 3 0x4000082 kqread syz-fuzzer 936 171326 37142 0 3 0x4000082 thrsleep syz-fuzzer 936 216519 37142 0 3 0x4000082 thrsleep syz-fuzzer 936 272227 37142 0 3 0x4000082 thrsleep syz-fuzzer 936 111783 37142 0 3 0x4000082 thrsleep syz-fuzzer 37142 129024 52021 0 3 0x10008a pause ksh 52021 115481 88266 0 3 0x92 select sshd 31229 403604 1 0 3 0x100083 ttyin getty 88266 279072 1 0 3 0x80 select sshd 87094 405997 92170 73 3 0x100090 kqread syslogd 92170 509043 1 0 3 0x100082 netio syslogd 37221 404456 1 77 3 0x100090 poll dhclient 71731 128266 1 0 3 0x80 poll dhclient 30077 219705 0 0 3 0x14200 pgzero zerothread 25835 237925 0 0 3 0x14200 aiodoned aiodoned 7529 247867 0 0 3 0x14200 syncer update 64280 33235 0 0 3 0x14200 cleaner cleaner 85610 102984 0 0 3 0x14200 reaper reaper 64834 497381 0 0 3 0x14200 pgdaemon pagedaemon 58941 226651 0 0 3 0x14200 bored crynlk 50098 209391 0 0 3 0x14200 bored crypto 23924 516037 0 0 3 0x40014200 acpi0 acpi0 84614 342011 0 0 3 0x40014200 idle1 13606 41306 0 0 3 0x14200 bored softnet 99190 127766 0 0 3 0x14200 bored systqmp 62970 336843 0 0 3 0x14200 bored systq 49650 214815 0 0 3 0x40014200 bored softclock 10737 39942 0 0 3 0x40014200 idle0 1 98821 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper