panic: receive 3: so 0xffffff006f2e1900, so_type 1, m 0xffffff0073dd7d00, m_type 6 Stopped at db_enter+0xa: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND 409910 55120 0 0 0 0 syz-executor1 *388448 55120 0 0 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,ffffff006f2e1900,ffff800021181b90,10ad,ffff800021181c20,ffffff006f2e1900) at soreceive+0x12d8 sys/kern/uipc_socket.c:933 recvit(ffff800021181c50,ffff800021181d58,ffff800021181d40,ffff8000210a2018,0) at recvit+0x28d sys/kern/uipc_syscalls.c:822 sys_recvmsg(1b0,ffff8000210a2018,1) 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,ffffffffffffffc1,0,3,71169600010) at Xsyscall+0x128 end of kernel end trace frame: 0x714459bb6b0, 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 0xffffff006f2e1900, so_type 1, m 0xffffff0073dd7d00, 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,ffffff006f2e1900,ffff800021181b90,10ad,ffff800021181c20,ffffff006f2e1900) at soreceive+0x12d8 sys/kern/uipc_socket.c:933 recvit(ffff800021181c50,ffff800021181d58,ffff800021181d40,ffff8000210a2018,0) at recvit+0x28d sys/kern/uipc_syscalls.c:822 sys_recvmsg(1b0,ffff8000210a2018,1) 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,ffffffffffffffc1,0,3,71169600010) at Xsyscall+0x128 end of kernel end trace frame: 0x714459bb6b0, count: -7 ddb{1}> show registers rdi 0xffffffff81e4c1c0 kprintf_mutex rsi 0xffffffff8136c339 db_enter+0x9 rbp 0xffff8000211819e0 rbx 0xffff800021181a80 rdx 0xffff800002ad8000 rcx 0x2687 __ALIGN_SIZE+0x1687 rax 0xffff800002ad8000 r8 0xffff8000211819b0 r9 0x1 r10 0 r11 0xffffffff812c6a00 x86_bus_space_io_read_1 r12 0x3000000008 r13 0xffff8000211819f0 r14 0x100 r15 0xffffffff81bd8dc2 cmd0646_9_tim_udma+0x53e7 rip 0xffffffff8136c33a db_enter+0xa cs 0x8 rflags 0x206 rsp 0xffff8000211819e0 ss 0x10 db_enter+0xa: popq %rbp ddb{1}> show proc PROC (syz-executor1) pid=388448 stat=onproc flags process=0 proc=4000000 pri=24, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff8000210a3c38,0xffff8000210a3798 process=0xffff8000210b6058 user=0xffff80002117c000, vmspace=0xffffff007f125738 estcpu=32, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 55120 409910 36126 0 7 0 syz-executor1 *55120 388448 36126 0 7 0x4000000 syz-executor1 55120 414934 36126 0 3 0x4000080 netlck syz-executor1 55120 290857 36126 0 2 0x4000000 syz-executor1 40602 20059 1 0 3 0x100083 ttyin getty 80245 161316 0 0 3 0x14200 bored sosplice 36126 34309 79469 0 3 0x82 nanosleep syz-executor1 77874 508122 79469 0 3 0x82 piperd syz-executor0 79469 466021 98490 0 3 0x82 thrsleep syz-fuzzer 79469 364585 98490 0 3 0x4000082 thrsleep syz-fuzzer 79469 430283 98490 0 3 0x4000082 thrsleep syz-fuzzer 79469 307375 98490 0 3 0x4000082 thrsleep syz-fuzzer 79469 66346 98490 0 3 0x4000082 thrsleep syz-fuzzer 79469 466584 98490 0 3 0x4000082 thrsleep syz-fuzzer 79469 104354 98490 0 3 0x4000082 kqread syz-fuzzer 79469 300682 98490 0 3 0x4000082 thrsleep syz-fuzzer 79469 98323 98490 0 3 0x4000082 thrsleep syz-fuzzer 79469 232713 98490 0 3 0x4000082 thrsleep syz-fuzzer 98490 417524 14410 0 3 0x10008a pause ksh 14410 15195 23194 0 3 0x92 select sshd 23194 511267 1 0 3 0x80 select sshd 16574 114740 92365 73 3 0x100090 kqread syslogd 92365 280895 1 0 3 0x100082 netio syslogd 59657 282486 1 77 3 0x100090 poll dhclient 80123 161947 1 0 3 0x80 poll dhclient 24673 366598 0 0 3 0x14200 pgzero zerothread 91976 410455 0 0 3 0x14200 aiodoned aiodoned 83083 165915 0 0 3 0x14200 syncer update 1273 521230 0 0 3 0x14200 cleaner cleaner 90645 462000 0 0 3 0x14200 reaper reaper 26483 508756 0 0 3 0x14200 pgdaemon pagedaemon 42508 101159 0 0 3 0x14200 bored crynlk 70580 172806 0 0 3 0x14200 bored crypto 37420 313748 0 0 3 0x40014200 acpi0 acpi0 1473 297345 0 0 3 0x40014200 idle1 77521 387464 0 0 3 0x14200 bored softnet 41534 323934 0 0 3 0x14200 bored systqmp 66898 205878 0 0 3 0x14200 bored systq 4566 355382 0 0 3 0x40014200 bored softclock 56954 11676 0 0 3 0x40014200 idle0 1 415591 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper