login: panic: receive 3: so 0xffffff0036f10c00, so_type 1, m 0xffffff0037cb8400, m_type 6 Stopped at db_enter+0xa: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND *131206 39170 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,ffffff0036f10c00,0,1088,ffff800014adc170,842) at soreceive+0x1288 sys/kern/uipc_socket.c:933 recvit(ffff800014adc1a0,ffff800014adc2a8,ffff800014adc290,ffff8000ffffc710,0) at recvit+0x28c sys/kern/uipc_syscalls.c:822 sys_recvmsg(ffff800014adc330,ffff8000ffffc710,ffff800014a15010) at sys_recvmsg+0x120 sys/kern/uipc_syscalls.c:758 syscall(0) at syscall+0x3e4 Xsyscall(6,0,ffffffffffffffc1,0,3,dee49aa8010) at Xsyscall+0x128 end of kernel end trace frame: 0xdf0e6d2eb90, 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 0xffffff0036f10c00, so_type 1, m 0xffffff0037cb8400, 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,ffffff0036f10c00,0,1088,ffff800014adc170,842) at soreceive+0x1288 sys/kern/uipc_socket.c:933 recvit(ffff800014adc1a0,ffff800014adc2a8,ffff800014adc290,ffff8000ffffc710,0) at recvit+0x28c sys/kern/uipc_syscalls.c:822 sys_recvmsg(ffff800014adc330,ffff8000ffffc710,ffff800014a15010) at sys_recvmsg+0x120 sys/kern/uipc_syscalls.c:758 syscall(0) at syscall+0x3e4 Xsyscall(6,0,ffffffffffffffc1,0,3,dee49aa8010) at Xsyscall+0x128 end of kernel end trace frame: 0xdf0e6d2eb90, count: -7 ddb> show registers rdi 0xffffffff81e142a0 kprintf_mutex rsi 0x5 rbp 0xffff800014adbf30 rbx 0xffff800014adbfd0 rdx 0x3fd rcx 0 rax 0x1 r8 0xffff800014adbf00 r9 0 r10 0xfcf73b1ead661cdf r11 0xffffffff81923d20 x86_bus_space_io_read_1 r12 0x3000000008 r13 0xffff800014adbf40 r14 0x100 r15 0xffffffff81bc5de3 cmd0646_9_tim_udma+0x925d rip 0xffffffff81b0d86a db_enter+0xa cs 0x8 rflags 0x202 rsp 0xffff800014adbf30 ss 0x10 db_enter+0xa: popq %rbp ddb> show proc PROC (syz-executor0) pid=131206 stat=onproc flags process=0 proc=4000000 pri=24, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffc008,0xffff8000ffffce28 process=0xffff800014a15010 user=0xffff800014ad7000, vmspace=0xffffff003f12c000 estcpu=0, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 39170 176644 1433 0 2 0 syz-executor0 *39170 131206 1433 0 7 0x4000000 syz-executor0 39170 241643 1433 0 3 0x4000080 fsleep syz-executor0 39170 155409 1433 0 3 0x4000080 netlck syz-executor0 39170 292872 1433 0 2 0x4000000 syz-executor0 87591 426937 87001 0 3 0x3000 suspend syz-executor1 87591 153834 87001 0 2 0x4081000 syz-executor1 87001 282317 82154 0 3 0x82 nanosleep syz-executor1 1433 395538 82154 0 3 0x82 nanosleep syz-executor0 82154 395140 25320 0 3 0x82 thrsleep syz-execprog 82154 70944 25320 0 3 0x4000082 thrsleep syz-execprog 82154 459870 25320 0 3 0x4000082 thrsleep syz-execprog 82154 462347 25320 0 3 0x4000082 thrsleep syz-execprog 82154 156408 25320 0 3 0x4000082 kqread syz-execprog 82154 346662 25320 0 3 0x4000082 thrsleep syz-execprog 82154 336836 25320 0 3 0x4000082 thrsleep syz-execprog 25320 78013 57357 0 3 0x10008a pause ksh 57357 137376 32404 0 3 0x92 select sshd 46769 251103 1 0 3 0x100083 ttyin getty 32404 292256 1 0 3 0x80 select sshd 90920 470109 21791 73 3 0x100090 kqread syslogd 21791 457595 1 0 3 0x100082 netio syslogd 36408 263705 1 77 3 0x100090 poll dhclient 67487 153267 1 0 3 0x80 poll dhclient 37210 291091 0 0 2 0x14200 zerothread 30344 451247 0 0 3 0x14200 aiodoned aiodoned 67467 432326 0 0 3 0x14200 syncer update 33898 68195 0 0 3 0x14200 cleaner cleaner 31763 279885 0 0 3 0x14200 reaper reaper 80912 73183 0 0 3 0x14200 pgdaemon pagedaemon 26400 203534 0 0 3 0x14200 bored crynlk 96518 375969 0 0 3 0x14200 bored crypto 7481 433926 0 0 3 0x40014200 acpi0 acpi0 30862 166764 0 0 3 0x14200 bored softnet 82005 238529 0 0 3 0x14200 bored systqmp 93816 143418 0 0 3 0x14200 bored systq 15199 264900 0 0 3 0x40014200 bored softclock 52029 182646 0 0 3 0x40014200 idle0 1 95489 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper