panic: receive 3: so 0xffffff007df5bdc0, so_type 1, m 0xffffff006f0e4500, m_type 6 Stopped at db_enter+0xa: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND *123637 6196 65534 0x10 0x4000000 0K syz-executor1 419306 6196 65534 0x10 0x4000000 1 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,ffffff007df5bdc0,ffff8000211a1700,3,ffff8000211a1790,ffffff007df5bdc0) at soreceive+0x12d8 sys/kern/uipc_socket.c:933 recvit(ffff8000211a17c0,ffff8000211a18c8,ffff8000211a18b0,ffff8000210852c8,0) at recvit+0x28d sys/kern/uipc_syscalls.c:822 sys_recvmsg(1b0,ffff8000210852c8,1) 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,d46efb5c010) at Xsyscall+0x128 end of kernel end trace frame: 0xd4930691f80, 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{0}> ddb{0}> set $lines = 0 ddb{0}> show panic receive 3: so 0xffffff007df5bdc0, so_type 1, m 0xffffff006f0e4500, m_type 6 ddb{0}> 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,ffffff007df5bdc0,ffff8000211a1700,3,ffff8000211a1790,ffffff007df5bdc0) at soreceive+0x12d8 sys/kern/uipc_socket.c:933 recvit(ffff8000211a17c0,ffff8000211a18c8,ffff8000211a18b0,ffff8000210852c8,0) at recvit+0x28d sys/kern/uipc_syscalls.c:822 sys_recvmsg(1b0,ffff8000210852c8,1) 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,d46efb5c010) at Xsyscall+0x128 end of kernel end trace frame: 0xd4930691f80, count: -7 ddb{0}> show registers rdi 0xffffffff81e24a88 kprintf_mutex rsi 0xffffffff81572de9 db_enter+0x9 rbp 0xffff8000211a1550 rbx 0xffff8000211a15f0 rdx 0xffff8000016d6000 rcx 0x2137 __ALIGN_SIZE+0x1137 rax 0xffff8000016d6000 r8 0xffff8000211a1520 r9 0 r10 0 r11 0xffffffff8181ffb0 x86_bus_space_io_read_1 r12 0x3000000008 r13 0xffff8000211a1560 r14 0x100 r15 0xffffffff81bdb731 cmd0646_9_tim_udma+0x5099 rip 0xffffffff81572dea db_enter+0xa cs 0x8 rflags 0x202 rsp 0xffff8000211a1550 ss 0x10 db_enter+0xa: popq %rbp ddb{0}> show proc PROC (syz-executor1) pid=123637 stat=onproc flags process=10 proc=4000000 pri=24, usrpri=76, nice=20 forw=0xffffffffffffffff, list=0xffff800021084008,0xffff8000210a2be0 process=0xffff8000210b6fe0 user=0xffff80002119c000, vmspace=0xffffff007f125108 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 6196 216729 53800 65534 2 0x10 syz-executor1 * 6196 123637 53800 65534 7 0x4000010 syz-executor1 6196 363741 53800 65534 2 0x4000010 syz-executor1 6196 419306 53800 65534 7 0x4000010 syz-executor1 53800 247844 27737 65534 3 0x90 nanosleep syz-executor1 27737 425101 99883 0 3 0x82 wait syz-executor1 54838 477343 41158 65534 3 0x90 piperd syz-executor0 41158 373262 99883 0 3 0x82 wait syz-executor0 67113 287806 0 0 3 0x14200 bored sosplice 99883 479370 31353 0 3 0x82 thrsleep syz-fuzzer 99883 163668 31353 0 3 0x4000082 thrsleep syz-fuzzer 99883 353571 31353 0 3 0x4000082 thrsleep syz-fuzzer 99883 86308 31353 0 3 0x4000082 kqread syz-fuzzer 99883 465706 31353 0 3 0x4000082 thrsleep syz-fuzzer 99883 267010 31353 0 3 0x4000082 thrsleep syz-fuzzer 99883 287038 31353 0 3 0x4000082 thrsleep syz-fuzzer 99883 422584 31353 0 3 0x4000082 thrsleep syz-fuzzer 99883 230706 31353 0 3 0x4000082 thrsleep syz-fuzzer 99883 331915 31353 0 3 0x4000082 thrsleep syz-fuzzer 99883 479017 31353 0 3 0x4000082 thrsleep syz-fuzzer 99883 97251 31353 0 3 0x4000082 thrsleep syz-fuzzer 31353 339197 95805 0 3 0x10008a pause ksh 95805 73238 77307 0 3 0x92 select sshd 14017 89442 1 0 3 0x100083 ttyin getty 77307 285962 1 0 3 0x80 select sshd 52997 273456 96831 73 3 0x100090 kqread syslogd 96831 339603 1 0 3 0x100082 netio syslogd 26107 225627 1 77 3 0x100090 poll dhclient 97251 343744 1 0 3 0x80 poll dhclient 13522 57219 0 0 3 0x14200 pgzero zerothread 57411 47893 0 0 3 0x14200 aiodoned aiodoned 59336 311147 0 0 3 0x14200 syncer update 48615 420127 0 0 3 0x14200 cleaner cleaner 10225 141445 0 0 3 0x14200 reaper reaper 57113 225949 0 0 3 0x14200 pgdaemon pagedaemon 21426 254533 0 0 3 0x14200 bored crynlk 56983 5124 0 0 3 0x14200 bored crypto 5121 203202 0 0 3 0x40014200 acpi0 acpi0 1747 422217 0 0 3 0x40014200 idle1 57285 504837 0 0 3 0x14200 bored softnet 29951 215131 0 0 3 0x14200 bored systqmp 20614 485952 0 0 3 0x14200 bored systq 61440 359861 0 0 3 0x40014200 bored softclock 2828 430784 0 0 3 0x40014200 idle0 1 25393 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper