panic: receive 3: so 0xffffff0069525320, so_type 1, m 0xffffff00657e4500, m_type 6 Stopped at db_enter+0xa: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND 144448 74403 65534 0x10 0 0 syz-executor0 *219204 74403 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,ffffff0069525320,ffff80002119d2b0,213d,ffff80002119d340,ffffff0069525320) at soreceive+0x12d8 sys/kern/uipc_socket.c:933 recvit(ffff80002119d370,ffff80002119d478,ffff80002119d460,ffff8000210a2720,0) at recvit+0x28d sys/kern/uipc_syscalls.c:822 sys_recvmsg(1b0,ffff8000210a2720,1) 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,f16a132e010) at Xsyscall+0x128 end of kernel end trace frame: 0xf18d1826570, 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 0xffffff0069525320, so_type 1, m 0xffffff00657e4500, 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,ffffff0069525320,ffff80002119d2b0,213d,ffff80002119d340,ffffff0069525320) at soreceive+0x12d8 sys/kern/uipc_socket.c:933 recvit(ffff80002119d370,ffff80002119d478,ffff80002119d460,ffff8000210a2720,0) at recvit+0x28d sys/kern/uipc_syscalls.c:822 sys_recvmsg(1b0,ffff8000210a2720,1) 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,f16a132e010) at Xsyscall+0x128 end of kernel end trace frame: 0xf18d1826570, count: -7 ddb{1}> show registers rdi 0xffffffff81e25a90 kprintf_mutex rsi 0xffffffff815cb899 db_enter+0x9 rbp 0xffff80002119d100 rbx 0xffff80002119d1a0 rdx 0xffff8000016d6000 rcx 0x2721 __ALIGN_SIZE+0x1721 rax 0xffff8000016d6000 r8 0xffff80002119d0d0 r9 0x1 r10 0 r11 0xffffffff818c0710 x86_bus_space_io_read_1 r12 0x3000000008 r13 0xffff80002119d110 r14 0x100 r15 0xffffffff81bda5c2 cmd0646_9_tim_udma+0x6628 rip 0xffffffff815cb89a db_enter+0xa cs 0x8 rflags 0x206 rsp 0xffff80002119d100 ss 0x10 db_enter+0xa: popq %rbp ddb{1}> show proc PROC (syz-executor0) pid=219204 stat=onproc flags process=10 proc=4000000 pri=24, usrpri=77, nice=20 forw=0xffffffffffffffff, list=0xffff8000210a2978,0xffff8000210a2280 process=0xffff8000210b6990 user=0xffff800021198000, vmspace=0xffffff00657e7110 estcpu=27, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 74403 144448 71924 65534 7 0x10 syz-executor0 *74403 219204 71924 65534 7 0x4000010 syz-executor0 74403 197221 71924 65534 3 0x4000090 netlck syz-executor0 74403 191794 71924 65534 2 0x4000010 syz-executor0 3864 399496 75239 65534 3 0x10 biowait syz-executor1 75239 504240 14485 0 3 0x82 wait syz-executor1 71924 122605 54338 65534 3 0x90 nanosleep syz-executor0 54338 400742 14485 0 3 0x82 wait syz-executor0 2786 434967 0 0 3 0x14200 bored sosplice 14485 38443 49581 0 3 0x82 thrsleep syz-fuzzer 14485 374188 49581 0 3 0x4000082 nanosleep syz-fuzzer 14485 434663 49581 0 3 0x4000082 thrsleep syz-fuzzer 14485 457317 49581 0 3 0x4000082 thrsleep syz-fuzzer 14485 418491 49581 0 3 0x4000082 thrsleep syz-fuzzer 14485 83607 49581 0 3 0x4000082 thrsleep syz-fuzzer 14485 405304 49581 0 3 0x4000082 thrsleep syz-fuzzer 14485 191530 49581 0 3 0x4000082 thrsleep syz-fuzzer 14485 504928 49581 0 3 0x4000082 kqread syz-fuzzer 14485 67447 49581 0 3 0x4000082 nanosleep syz-fuzzer 49581 160425 69799 0 3 0x10008a pause ksh 69799 169048 79285 0 3 0x92 select sshd 85600 436023 1 0 3 0x100083 ttyin getty 79285 8750 1 0 3 0x80 select sshd 70499 375482 81770 73 3 0x100090 kqread syslogd 81770 347081 1 0 3 0x100082 netio syslogd 23190 420460 1 77 3 0x100090 poll dhclient 93954 282061 1 0 3 0x80 poll dhclient 19886 83364 0 0 3 0x14200 pgzero zerothread 45430 261169 0 0 3 0x14200 aiodoned aiodoned 33826 400915 0 0 3 0x14200 syncer update 14587 154303 0 0 3 0x14200 cleaner cleaner 83922 354561 0 0 3 0x14200 reaper reaper 79928 444540 0 0 3 0x14200 pgdaemon pagedaemon 90758 376526 0 0 3 0x14200 bored crynlk 20874 515089 0 0 3 0x14200 bored crypto 87084 162367 0 0 3 0x40014200 acpi0 acpi0 2454 126870 0 0 3 0x40014200 idle1 31984 144726 0 0 3 0x14200 bored softnet 15832 374252 0 0 3 0x14200 bored systqmp 94989 501293 0 0 3 0x14200 bored systq 88813 495111 0 0 3 0x40014200 bored softclock 47848 424259 0 0 3 0x40014200 idle0 1 401358 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper