panic() at panic+0x15c sys/kern/subr_prf.c:208 fifo_badop(ffff800014a4c0a0) at fifo_badop+0x14 sys/miscfs/fifofs/fifo_vnops.c:491 VOP_STRATEGY(fffffd802f4dad00) at VOP_STRATEGY+0xa5 sys/kern/vfs_vops.c:719 bwrite(fffffd802f4dad00) at bwrite+0x203 sys/kern/vfs_bio.c:742 VOP_BWRITE(fffffd802f4dad00) at VOP_BWRITE+0x56 sys/kern/vfs_vops.c:731 ufs_mkdir(ffff800014a4c340) at ufs_mkdir+0x741 sys/ufs/ufs/ufs_vnops.c:1250 VOP_MKDIR(fffffd8039fc3200,ffff800014a4c3f8,ffff800014a4c448,ffff800014a4c488) at VOP_MKDIR+0x76 sys/kern/vfs_vops.c:449 domkdirat(ffff8000ffff8e18,ffffff9c,7f7fffff1920,1ff) at domkdirat+0x12d sys/kern/vfs_syscalls.c:2881 syscall(ffff800014a4c680) at syscall+0x541 Xsyscall(6,88,7f7fffff1920,88,0,7f7fffff1944) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff1990, 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> set $maxwidth = 0 ddb> show panic fifo_badop called ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x15c sys/kern/subr_prf.c:208 fifo_badop(ffff800014a4c0a0) at fifo_badop+0x14 sys/miscfs/fifofs/fifo_vnops.c:491 VOP_STRATEGY(fffffd802f4dad00) at VOP_STRATEGY+0xa5 sys/kern/vfs_vops.c:719 bwrite(fffffd802f4dad00) at bwrite+0x203 sys/kern/vfs_bio.c:742 VOP_BWRITE(fffffd802f4dad00) at VOP_BWRITE+0x56 sys/kern/vfs_vops.c:731 ufs_mkdir(ffff800014a4c340) at ufs_mkdir+0x741 sys/ufs/ufs/ufs_vnops.c:1250 VOP_MKDIR(fffffd8039fc3200,ffff800014a4c3f8,ffff800014a4c448,ffff800014a4c488) at VOP_MKDIR+0x76 sys/kern/vfs_vops.c:449 domkdirat(ffff8000ffff8e18,ffffff9c,7f7fffff1920,1ff) at domkdirat+0x12d sys/kern/vfs_syscalls.c:2881 syscall(ffff800014a4c680) at syscall+0x541 Xsyscall(6,88,7f7fffff1920,88,0,7f7fffff1944) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff1990, count: -11 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800014a4bfd0 rbx 0xffff800014a4c080 rdx 0x2 rcx 0 rax 0 r8 0xffff800014a4bf90 r9 0x1 r10 0 r11 0xebf3fe13395d9d16 r12 0x3000000008 r13 0xffff800014a4bfe0 r14 0x100 r15 0x1 rip 0xffffffff81679bb8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800014a4bfc0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=335837 stat=onproc flags process=2 proc=0 pri=17, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000149eebd0,0xffffffff822df660 process=0xffff8000ffff7a50 user=0xffff800014a47000, vmspace=0xfffffd803f014420 estcpu=36, cpticks=5, pctcpu=0.0 user=0, sys=4, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *36262 335837 32027 0 7 0x2 syz-executor.1 33501 238988 1 0 3 0x100083 ttyin getty 16373 218416 32027 0 2 0x2 syz-executor.0 58463 154698 0 0 3 0x14200 bored sosplice 32027 67392 53612 0 3 0x82 thrsleep syz-fuzzer 32027 241652 53612 0 3 0x4000082 thrsleep syz-fuzzer 32027 279020 53612 0 3 0x4000082 thrsleep syz-fuzzer 32027 351304 53612 0 3 0x4000082 thrsleep syz-fuzzer 32027 197283 53612 0 3 0x4000082 thrsleep syz-fuzzer 32027 42607 53612 0 3 0x4000082 kqread syz-fuzzer 32027 189019 53612 0 3 0x4000082 thrsleep syz-fuzzer 32027 325271 53612 0 3 0x4000082 thrsleep syz-fuzzer 32027 119231 53612 0 3 0x4000082 thrsleep syz-fuzzer 53612 219832 63662 0 3 0x10008a pause ksh 63662 311132 42411 0 3 0x92 select sshd 42411 53685 1 0 3 0x80 select sshd 18529 188670 24918 73 3 0x100090 kqread syslogd 24918 430186 1 0 3 0x100082 netio syslogd 54199 321788 1 77 3 0x100090 poll dhclient 21032 336329 1 0 3 0x80 poll dhclient 19807 365687 0 0 3 0x14200 pgzero zerothread 19947 362134 0 0 3 0x14200 aiodoned aiodoned 61564 434071 0 0 3 0x14200 syncer update 22815 78815 0 0 3 0x14200 cleaner cleaner 78853 167417 0 0 3 0x14200 reaper reaper 77184 106695 0 0 3 0x14200 pgdaemon pagedaemon 26378 73595 0 0 3 0x14200 bored crynlk 86355 503576 0 0 3 0x14200 bored crypto 10471 512194 0 0 3 0x40014200 acpi0 acpi0 32526 327232 0 0 3 0x14200 bored softnet 2950 382305 0 0 3 0x14200 bored systqmp 39804 294227 0 0 3 0x14200 bored systq 10095 286749 0 0 3 0x40014200 bored softclock 33906 104420 0 0 3 0x40014200 idle0 53323 509842 0 0 3 0x14200 bored smr 1 517205 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9524 6354K 6370K 78643K 11609 0 0 pcb 23 9K 11K 78643K 1457 0 0 rtable 100 3K 4K 78643K 1620 0 0 ifaddr 62 17K 18K 78643K 567 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 0 0K 2K 78643K 75 0 0 iov 0 0K 24K 78643K 411 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1208 76K 76K 78643K 3097 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 26 0 0 VM map 2 0K 0K 78643K 2 0 0 sem 12 0K 1K 78643K 332 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1793 195K 288K 78643K 12537 0 0 file desc 4 9K 25K 78643K 2541 0 0 sigio 0 0K 0K 78643K 45 0 0 proc 42 30K 54K 78643K 1088 0 0 subproc 64 65538K 69634K 78643K 973 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 336 0 0 in_multi 33 2K 2K 78643K 443 0 0 ether_multi 1 0K 0K 78643K 28 0 0 mrt 0 0K 0K 78643K 5 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 102 450K 450K 78643K 102 0 0 exec 0 0K 1K 78643K 752 0 0 pfkey data 0 0K 1K 78643K 3 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 95 21K 24K 78643K 7730 0 0 UVM aobj 107 3K 3K 78643K 122 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 1K 78643K 107 0 0 NDP 13 0K 0K 78643K 187 0 0 temp 177 2359K 2427K 78643K 11349 0 0 kqueue 0 0K 0K 78643K 11 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 30 0 26 1 0 1 1 0 8 0 inpcbpl 280 1183 0 1176 1 0 1 1 0 8 0 plimitpl 152 109 0 102 1 0 1 1 0 8 0 rtentry 112 277 0 237 2 0 2 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 4 0 4 1 1 0 1 0 8 0 tcpcb 544 444 0 440 1 0 1 1 0 8 0 nd6 48 56 0 52 1 0 1 1 0 8 0 ppxss 1128 77 0 77 25 25 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1283 0 1091 14 2 12 13 0 8 0 art_table 32 1284 0 1091 2 0 2 2 0 8 0 art_node 16 274 0 240 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 8 2 1 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 330 0 320 1 0 1 1 0 8 0 shmpl 112 120 0 15 4 0 4 4 0 8 1 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 6224 0 4688 50 0 50 50 0 8 0 ffsino 240 6224 0 4688 92 1 91 91 0 8 0 nchpl 144 9912 0 8214 64 0 64 64 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 200 5926 0 0 312 0 312 312 0 8 0 namei 1024 32543 0 32542 4 3 1 1 0 8 0 scsiplug 64 8 0 8 6 6 0 1 0 8 0 scxspl 192 133608 0 133608 23 22 1 6 0 8 1 sigapl 432 2633 0 2621 2 0 2 2 0 8 0 futexpl 56 40483 0 40483 3 2 1 1 0 8 1 knotepl 112 1008 0 981 6 5 1 2 0 8 0 kqueuepl 104 614 0 612 1 0 1 1 0 8 0 pipepl 112 1754 0 1735 7 6 1 2 0 8 0 fdescpl 424 2634 0 2621 2 0 2 2 0 8 0 filepl 120 17389 0 17294 8 4 4 5 0 8 0 lockfpl 104 766 0 766 43 42 1 1 0 8 1 lockfspl 32 1063 0 1063 43 42 1 1 0 8 1 sessionpl 112 45 0 35 1 0 1 1 0 8 0 pgrppl 48 76 0 66 1 0 1 1 0 8 0 ucredpl 96 4888 0 4881 1 0 1 1 0 8 0 zombiepl 144 2621 0 2621 2 1 1 1 0 8 1 processpl 840 2649 0 2621 4 0 4 4 0 8 0 procpl 600 6358 0 6322 4 0 4 4 0 8 0 sosppl 128 33 0 33 10 10 0 1 0 8 0 sockpl 384 2458 0 2441 46 43 3 4 0 8 1 mcl64k 65536 455 0 455 76 75 1 29 0 8 1 mcl16k 16384 8 0 8 8 8 0 1 0 8 0 mcl12k 12288 62 0 62 28 27 1 1 0 8 1 mcl9k 9216 37 0 37 22 21 1 1 0 8 1 mcl8k 8192 41 0 41 24 24 0 1 0 8 0 mcl4k 4096 156 0 156 39 39 0 1 0 8 0 mcl2k2 2112 19 0 19 12 11 1 1 0 8 1 mcl2k 2048 50448 0 50405 21 15 6 13 0 8 0 mtagpl 80 4 0 4 2 2 0 1 0 8 0 mbufpl 256 98365 0 98287 45 37 8 21 0 8 0 bufpl 256 13830 0 8168 355 0 355 355 0 8 0 anonpl 16 1221816 0 1213496 126 77 49 67 0 62 0 amapchunkpl 152 17425 0 17349 81 77 4 14 0 158 0 amappl16 192 68353 0 67875 182 152 30 48 0 8 3 amappl15 184 408 0 406 1 0 1 1 0 8 0 amappl14 176 739 0 734 1 0 1 1 0 8 0 amappl13 168 622 0 618 1 0 1 1 0 8 0 amappl12 160 487 0 487 4 4 0 1 0 8 0 amappl11 152 681 0 671 1 0 1 1 0 8 0 amappl10 144 435 0 432 2 1 1 1 0 8 0 amappl9 136 887 0 884 1 0 1 1 0 8 0 amappl8 128 933 0 901 2 0 2 2 0 8 0 amappl7 120 470 0 463 1 0 1 1 0 8 0 amappl6 112 313 0 306 1 0 1 1 0 8 0 amappl5 104 260 0 248 1 0 1 1 0 8 0 amappl4 96 661 0 636 1 0 1 1 0 8 0 amappl3 88 379 0 373 1 0 1 1 0 8 0 amappl2 80 24100 0 24057 2 0 2 2 0 8 0 amappl1 72 58816 0 58420 23 13 10 19 0 8 0 amappl 72 6955 0 6926 1 0 1 1 0 75 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma64 64 259 0 259 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 17 0 17 1 1 0 1 0 8 0 aobjpl 64 121 0 15 2 0 2 2 0 8 0 uaddrrnd 24 2634 0 2621 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2634 0 2621 1 0 1 1 0 8 0 vmmpekpl 168 22151 0 22129 2 0 2 2 0 8 0 vmmpepl 168 535491 0 534156 283 211 72 88 0 357 0 vmsppl 264 2633 0 2621 11 10 1 2 0 8 0 pdppl 4096 5274 0 5242 6 1 5 6 0 8 0 pvpl 32 3642693 0 3631367 687 522 165 235 0 265 56 pmappl 192 2633 0 2621 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 691 0 207 15 0 15 15 0 8 0