panic() at panic+0x147 fifo_badop(ffffffff813c6772) at fifo_badop+0x12 VOP_STRATEGY(ffffff00614adc00) at VOP_STRATEGY+0x6b bwrite(ffff80002114eab0) at bwrite+0x195 VOP_BWRITE(ffffff006bbd8008) at VOP_BWRITE+0x47 ufs_mkdir(ffffffff81e0f848) at ufs_mkdir+0x5a9 VOP_MKDIR(ffff8000210c3780,1ed,ffffff9c,ffff80002114ea68) at VOP_MKDIR+0x65 domkdirat(ffff80002114eca0,ffff8000210c3780,ffff8000210a5660,880) at domkdirat+0x10f syscall(0) at syscall+0x3e4 Xsyscall(6,88,7f7ffffd7110,88,0,7f7ffffd7150) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd7180, count: 4 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 fifo_badop called ddb> trace db_enter() at db_enter+0xa panic() at panic+0x147 fifo_badop(ffffffff813c6772) at fifo_badop+0x12 VOP_STRATEGY(ffffff00614adc00) at VOP_STRATEGY+0x6b bwrite(ffff80002114eab0) at bwrite+0x195 VOP_BWRITE(ffffff006bbd8008) at VOP_BWRITE+0x47 ufs_mkdir(ffffffff81e0f848) at ufs_mkdir+0x5a9 VOP_MKDIR(ffff8000210c3780,1ed,ffffff9c,ffff80002114ea68) at VOP_MKDIR+0x65 domkdirat(ffff80002114eca0,ffff8000210c3780,ffff8000210a5660,880) at domkdirat+0x10f syscall(0) at syscall+0x3e4 Xsyscall(6,88,7f7ffffd7110,88,0,7f7ffffd7150) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd7180, count: -11 ddb> show registers rdi 0xffffffff81dfc450 kprintf_mutex rsi 0x5 rbp 0xffff80002114e6f0 rbx 0xffff80002114e790 rdx 0x3fd rcx 0 rax 0 r8 0xffff80002114e6c0 r9 0 r10 0xffff80002114e528 r11 0x8 r12 0x3000000008 r13 0xffff80002114e700 r14 0x100 r15 0xffffffff81c29eab apollo_udma66_tim+0x401c rip 0xffffffff8111f55a db_enter+0xa cs 0x8 rflags 0x246 rsp 0xffff80002114e6f0 ss 0x10 db_enter+0xa: popq %rbp ddb> show proc PROC (syz-executor1) pid=20330 stat=onproc flags process=2 proc=0 pri=17, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000210c3528,0xffff8000210c39e8 process=0xffff8000210a5660 user=0xffff800021149000, vmspace=0xffffff007f12b108 estcpu=36, cpticks=6, pctcpu=0.0 user=0, sys=4, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 2514 463267 1 0 3 0x100083 ttyin getty 43950 72911 0 0 3 0x14200 bored sosplice 82177 200297 36121 0 2 0x2 syz-executor0 *30791 20330 36121 0 7 0x2 syz-executor1 36121 255932 23333 0 3 0x82 thrsleep syz-fuzzer 36121 204221 23333 0 2 0x4000482 syz-fuzzer 36121 281058 23333 0 3 0x4000082 thrsleep syz-fuzzer 36121 381600 23333 0 3 0x4000082 thrsleep syz-fuzzer 36121 181490 23333 0 3 0x4000082 thrsleep syz-fuzzer 36121 438038 23333 0 3 0x4000082 thrsleep syz-fuzzer 36121 344672 23333 0 3 0x4000082 kqread syz-fuzzer 23333 344693 11127 0 3 0x10008a pause ksh 11127 492331 21811 0 3 0x92 select sshd 21811 174583 1 0 3 0x80 select sshd 58622 13706 75026 73 3 0x100090 kqread syslogd 75026 9152 1 0 3 0x100082 netio syslogd 97690 448388 1 77 3 0x100090 poll dhclient 67095 182300 1 0 3 0x80 poll dhclient 16926 224183 0 0 3 0x14200 pgzero zerothread 35222 363569 0 0 3 0x14200 aiodoned aiodoned 33948 68353 0 0 3 0x14200 syncer update 31146 154453 0 0 3 0x14200 cleaner cleaner 37077 425890 0 0 3 0x14200 reaper reaper 22249 186152 0 0 3 0x14200 pgdaemon pagedaemon 59737 101735 0 0 3 0x14200 bored crynlk 12726 18289 0 0 3 0x14200 bored crypto 20766 253440 0 0 3 0x40014200 acpi0 acpi0 1230 439166 0 0 3 0x14200 bored softnet 1407 366761 0 0 3 0x14200 bored systqmp 6894 323572 0 0 3 0x14200 bored systq 62565 294770 0 0 3 0x40014200 bored softclock 67922 34769 0 0 3 0x40014200 idle0 1 319924 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper