panic: receive 3: so 0xffffff00311c9988, so_type 1, m 0xffffff00351c6800, m_type 6 Stopped at db_enter+0xa: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 34073 64072 0 0 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,ffffff00311c9988,ffff800014ad6350,21ff,ffff800014ad63e0,40) at soreceive+0x1288 sys/kern/uipc_socket.c:933 recvit(ffff800014ad6410,ffff800014ad6518,ffff800014ad6500,ffff800014a1ce48,0) at recvit+0x28c sys/kern/uipc_syscalls.c:822 sys_recvmsg(ffff800014ad65a0,ffff800014a1ce48,ffff800014a16300) at sys_recvmsg+0x120 sys/kern/uipc_syscalls.c:758 syscall(0) at syscall+0x3e4 Xsyscall(6,0,ffffffffffffffc1,0,3,6b51ea9d010) at Xsyscall+0x128 end of kernel end trace frame: 0x6b7d4c60650, 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> ddb> set $lines = 0 ddb> show panic receive 3: so 0xffffff00311c9988, so_type 1, m 0xffffff00351c6800, m_type 6 ddb> 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,ffffff00311c9988,ffff800014ad6350,21ff,ffff800014ad63e0,40) at soreceive+0x1288 sys/kern/uipc_socket.c:933 recvit(ffff800014ad6410,ffff800014ad6518,ffff800014ad6500,ffff800014a1ce48,0) at recvit+0x28c sys/kern/uipc_syscalls.c:822 sys_recvmsg(ffff800014ad65a0,ffff800014a1ce48,ffff800014a16300) at sys_recvmsg+0x120 sys/kern/uipc_syscalls.c:758 syscall(0) at syscall+0x3e4 Xsyscall(6,0,ffffffffffffffc1,0,3,6b51ea9d010) at Xsyscall+0x128 end of kernel end trace frame: 0x6b7d4c60650, count: -7 ddb> show registers rdi 0xffffffff81e2d478 kprintf_mutex rsi 0xffffffff81471bd9 db_enter+0x9 rbp 0xffff800014ad61a0 rbx 0xffff800014ad6240 rdx 0xffff800000acb000 rcx 0x261c __ALIGN_SIZE+0x161c rax 0xffff800000acb000 r8 0xffff800014ad6170 r9 0 r10 0x8c2156721b832aad r11 0xffffffff811502b0 x86_bus_space_io_read_1 r12 0x3000000008 r13 0xffff800014ad61b0 r14 0x100 r15 0xffffffff81bc129c cmd0646_9_tim_udma+0x1ac7 rip 0xffffffff81471bda db_enter+0xa cs 0x8 rflags 0x202 rsp 0xffff800014ad61a0 ss 0x10 db_enter+0xa: popq %rbp ddb> show proc PROC (syz-executor0) pid=34073 stat=onproc flags process=0 proc=4000000 pri=24, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800014a1d2f8,0xffff800014a1c2a0 process=0xffff800014a16300 user=0xffff800014ad1000, vmspace=0xffffff003f12cd68 estcpu=29, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 64072 254873 52617 0 2 0 syz-executor0 *64072 34073 52617 0 7 0x4000000 syz-executor0 64072 59320 52617 0 3 0x4000080 netlck syz-executor0 64072 421627 52617 0 2 0x4000000 syz-executor0 45114 24903 1 0 3 0x100083 ttyin getty 15355 343881 0 0 3 0x14200 bored sosplice 8278 53421 643 0 3 0x82 piperd syz-executor1 52617 121014 643 0 3 0x82 nanosleep syz-executor0 643 475899 38122 0 3 0x82 thrsleep syz-fuzzer 643 487708 38122 0 3 0x4000082 thrsleep syz-fuzzer 643 344983 38122 0 3 0x4000082 thrsleep syz-fuzzer 643 264146 38122 0 3 0x4000082 thrsleep syz-fuzzer 643 283169 38122 0 3 0x4000082 kqread syz-fuzzer 643 95588 38122 0 3 0x4000082 thrsleep syz-fuzzer 643 150788 38122 0 3 0x4000082 thrsleep syz-fuzzer 38122 484473 83999 0 3 0x10008a pause ksh 83999 199119 21763 0 3 0x92 select sshd 21763 319343 1 0 3 0x80 select sshd 12285 60586 79766 73 3 0x100090 kqread syslogd 79766 109820 1 0 3 0x100082 netio syslogd 7231 259353 1 77 3 0x100090 poll dhclient 532 453880 1 0 3 0x80 poll dhclient 20686 91612 0 0 2 0x14200 zerothread 12825 416824 0 0 3 0x14200 aiodoned aiodoned 3456 115031 0 0 3 0x14200 syncer update 93538 246008 0 0 3 0x14200 cleaner cleaner 68159 157669 0 0 3 0x14200 reaper reaper 53011 181244 0 0 3 0x14200 pgdaemon pagedaemon 83392 284844 0 0 3 0x14200 bored crynlk 97744 207390 0 0 3 0x14200 bored crypto 88522 488638 0 0 3 0x40014200 acpi0 acpi0 31302 437002 0 0 3 0x14200 bored softnet 59399 148378 0 0 3 0x14200 bored systqmp 22402 302419 0 0 3 0x14200 bored systq 9615 301579 0 0 3 0x40014200 bored softclock 12154 396144 0 0 3 0x40014200 idle0 1 79344 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper