panic: receive 3: so 0xffffff0069b31c68, so_type 1, m 0xffffff006db87300, m_type 6 Stopped at db_enter+0xa: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND 361894 65588 65534 0x10 0 0 syz-executor1 *404805 65588 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,ffffff0069b31c68,0,9,ffff8000211cb048,ffffff0069b31c68) at soreceive+0x12d8 sys/kern/uipc_socket.c:933 recvit(ffff800021085778,ffff8000211cb0e0,0,ffff8000211cb0f8,4a73ba697c8) at recvit+0x28d sys/kern/uipc_syscalls.c:822 sys_recvfrom(1d0,ffff800021085778,1) at sys_recvfrom+0xbc sys/kern/uipc_syscalls.c:722 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,ffffffffffffffbd,0,6,4a4e34f9010) at Xsyscall+0x128 end of kernel end trace frame: 0x4a73ba69850, 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 0xffffff0069b31c68, so_type 1, m 0xffffff006db87300, 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,ffffff0069b31c68,0,9,ffff8000211cb048,ffffff0069b31c68) at soreceive+0x12d8 sys/kern/uipc_socket.c:933 recvit(ffff800021085778,ffff8000211cb0e0,0,ffff8000211cb0f8,4a73ba697c8) at recvit+0x28d sys/kern/uipc_syscalls.c:822 sys_recvfrom(1d0,ffff800021085778,1) at sys_recvfrom+0xbc sys/kern/uipc_syscalls.c:722 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,ffffffffffffffbd,0,6,4a4e34f9010) at Xsyscall+0x128 end of kernel end trace frame: 0x4a73ba69850, count: -7 ddb{1}> show registers rdi 0xffffffff81e24a88 kprintf_mutex rsi 0xffffffff81572de9 db_enter+0x9 rbp 0xffff8000211cae00 rbx 0xffff8000211caea0 rdx 0xffff8000042dc000 rcx 0x2302 __ALIGN_SIZE+0x1302 rax 0xffff8000042dc000 r8 0xffff8000211cadd0 r9 0x1 r10 0 r11 0xffffffff8181ffb0 x86_bus_space_io_read_1 r12 0x3000000008 r13 0xffff8000211cae10 r14 0x100 r15 0xffffffff81bdb731 cmd0646_9_tim_udma+0x5099 rip 0xffffffff81572dea db_enter+0xa cs 0x8 rflags 0x202 rsp 0xffff8000211cae00 ss 0x10 db_enter+0xa: popq %rbp ddb{1}> show proc PROC (syz-executor1) pid=404805 stat=onproc flags process=10 proc=4000000 pri=24, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800021084260,0xffff800021084720 process=0xffff8000210a2340 user=0xffff8000211c6000, vmspace=0xffffff0065831218 estcpu=29, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 68743 155228 61753 65534 3 0x90 nanosleep syz-executor0 68743 152774 61753 65534 3 0x4000090 kqread syz-executor0 65588 361894 87617 65534 7 0x10 syz-executor1 *65588 404805 87617 65534 7 0x4000010 syz-executor1 65588 18536 87617 65534 3 0x4000090 netlck syz-executor1 65588 187465 87617 65534 2 0x4000010 syz-executor1 87617 426544 4640 65534 3 0x90 nanosleep syz-executor1 4640 9469 5083 0 3 0x82 wait syz-executor1 61753 258446 94221 65534 3 0x90 nanosleep syz-executor0 94221 129281 5083 0 3 0x82 wait syz-executor0 77536 139515 0 0 3 0x14200 bored sosplice 5083 281727 43722 0 3 0x82 thrsleep syz-fuzzer 5083 190223 43722 0 3 0x4000082 thrsleep syz-fuzzer 5083 443206 43722 0 3 0x4000082 thrsleep syz-fuzzer 5083 393091 43722 0 3 0x4000082 thrsleep syz-fuzzer 5083 200115 43722 0 3 0x4000082 thrsleep syz-fuzzer 5083 194793 43722 0 3 0x4000082 thrsleep syz-fuzzer 5083 519513 43722 0 3 0x4000082 thrsleep syz-fuzzer 5083 229571 43722 0 3 0x4000082 thrsleep syz-fuzzer 5083 425364 43722 0 3 0x4000082 kqread syz-fuzzer 5083 173336 43722 0 3 0x4000082 thrsleep syz-fuzzer 5083 124692 43722 0 3 0x4000082 thrsleep syz-fuzzer 43722 171875 23486 0 3 0x10008a pause ksh 23486 117438 92755 0 3 0x92 select sshd 20497 256376 1 0 3 0x100083 ttyin getty 92755 484716 1 0 3 0x80 select sshd 95048 489006 86246 73 3 0x100090 kqread syslogd 86246 419000 1 0 3 0x100082 netio syslogd 8753 347836 1 77 3 0x100090 poll dhclient 45228 344310 1 0 3 0x80 poll dhclient 99106 424315 0 0 3 0x14200 pgzero zerothread 61901 414855 0 0 3 0x14200 aiodoned aiodoned 21396 91982 0 0 3 0x14200 syncer update 25599 87562 0 0 3 0x14200 cleaner cleaner 2120 107247 0 0 3 0x14200 reaper reaper 24702 292879 0 0 3 0x14200 pgdaemon pagedaemon 45736 225300 0 0 3 0x14200 bored crynlk 91984 175163 0 0 3 0x14200 bored crypto 16982 520422 0 0 3 0x40014200 acpi0 acpi0 21283 287166 0 0 3 0x40014200 idle1 61874 163499 0 0 3 0x14200 bored softnet 1004 313294 0 0 3 0x14200 bored systqmp 29432 388740 0 0 3 0x14200 bored systq 83031 149321 0 0 3 0x40014200 bored softclock 472 374540 0 0 3 0x40014200 idle0 1 193438 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper