panic: ufs_rename: lost dir entry Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *197090 51920 0 0 0x4000000 0 syz-executor3636140155 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82583a2a) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002178dbb8) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd1510,fffffd806c624200,ffff80002178dd88,fffffd806c624560,fffffd806c624638,ffff80002178dcd8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff80002172dce8,3,20000180,5,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002178df20) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xce67b0ee9f0, 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> set $maxwidth = 0 ddb> show panic *cpu0: ufs_rename: lost dir entry ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82583a2a) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002178dbb8) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd1510,fffffd806c624200,ffff80002178dd88,fffffd806c624560,fffffd806c624638,ffff80002178dcd8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff80002172dce8,3,20000180,5,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002178df20) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xce67b0ee9f0, count: -7 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002178d950 rbx 0xfffffd806c624488 rdx 0x3fd rcx 0 rax 0x22 r8 0x101010101010101 r9 0x8080808080808080 r10 0x9d3b417f8854f634 r11 0x433e5a1d64851abe r12 0 r13 0xfffffd806c6441e8 r14 0 r15 0x1 rip 0xffffffff812e0e88 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002178d940 ss 0 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor3636140155) pid=197090 stat=onproc flags process=0 proc=4000000 pri=17, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff80002172d268,0xffffffff82a4c868 process=0xffff80002172b7a0 user=0xffff800021788000, vmspace=0xfffffd806c893780 estcpu=5, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 8934 52213 53845 0 2 0 syz-executor3636140155 8934 199641 53845 0 3 0x4000080 fsleep syz-executor3636140155 51920 326968 95441 0 2 0 syz-executor3636140155 51920 132792 95441 0 3 0x4000080 fsleep syz-executor3636140155 *51920 197090 95441 0 7 0x4000000 syz-executor3636140155 16308 96678 47942 0 2 0 syz-executor3636140155 16308 427289 47942 0 3 0x4000080 fsleep syz-executor3636140155 5339 187544 30629 0 2 0 syz-executor3636140155 18892 199541 77953 0 2 0 syz-executor3636140155 18892 321417 77953 0 3 0x4000080 fsleep syz-executor3636140155 98452 91594 9828 0 2 0 syz-executor3636140155 98452 102698 9828 0 3 0x4000080 fsleep syz-executor3636140155 98452 356616 9828 0 2 0x4000000 syz-executor3636140155 95441 421513 22884 0 2 0x480 syz-executor3636140155 41828 257342 22884 0 2 0x480 syz-executor3636140155 53845 362122 22884 0 2 0x480 syz-executor3636140155 9828 129152 22884 0 2 0x480 syz-executor3636140155 77953 340154 22884 0 2 0x480 syz-executor3636140155 30629 97690 22884 0 2 0x480 syz-executor3636140155 92072 47262 22884 0 2 0 syz-executor3636140155 47942 497943 22884 0 3 0x80 nanoslp syz-executor3636140155 22884 215885 56399 0 3 0x82 nanoslp syz-executor3636140155 56399 81325 91982 0 3 0x10008a sigsusp ksh 91982 56422 52634 0 3 0x9a kqread sshd 94474 411801 1 0 3 0x100083 ttyin getty 52634 419490 1 0 3 0x88 kqread sshd 31079 8817 78314 73 3 0x1100090 kqread syslogd 78314 248492 1 0 3 0x100082 netio syslogd 22374 446009 1 0 3 0x100080 kqread resolvd 86779 420106 59108 77 3 0x100092 kqread dhcpleased 41599 96395 59108 77 3 0x100092 kqread dhcpleased 59108 250853 1 0 3 0x80 kqread dhcpleased 65347 269603 0 0 3 0x14200 bored smr 73615 423463 0 0 2 0x14200 zerothread 15482 324723 0 0 3 0x14200 aiodoned aiodoned 73973 241977 0 0 3 0x14200 syncer update 51292 446248 0 0 3 0x14200 cleaner cleaner 71371 103558 0 0 3 0x14200 reaper reaper 49944 413211 0 0 3 0x14200 pgdaemon pagedaemon 59976 27072 0 0 3 0x14200 bored viomb 65456 63026 0 0 3 0x40014200 acpi0 acpi0 14706 330046 0 0 3 0x14200 bored softnet 88341 372390 0 0 3 0x14200 bored softnet 8595 174987 0 0 3 0x14200 bored softnet 6244 15148 0 0 3 0x14200 bored softnet 34840 130008 0 0 3 0x14200 bored systqmp 33391 31455 0 0 3 0x14200 bored systq 97762 36971 0 0 3 0x40014200 bored softclock 40489 99382 0 0 3 0x40014200 idle0 1 213794 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 devbuf 10143 6382K 6413K 78643K 11233 0 pcb 13 8K 8K 78643K 13 0 rtable 58 1K 2K 78643K 111 0 ifaddr 25 7K 7K 78643K 25 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 25 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1166 73K 73K 78643K 1179 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 0K 0K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 1 0K 0K 78643K 1 0 proc 55 58K 59K 78643K 226 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 25 122K 122K 78643K 25 0 exec 0 0K 2K 78643K 411 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 104 5K 6K 78643K 1636 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 3 0K 0K 78643K 3 0 temp 18 4709K 4773K 78643K 2837 0 kqueue 11 16K 18K 78643K 24 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 21 0 18 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 144 33 0 20 1 0 1 1 0 8 0 syncache 296 5 0 5 2 1 1 1 0 8 1 tcpcb 768 8 0 5 1 0 1 1 0 8 0 arp 88 2 0 0 1 0 1 1 0 8 0 inpcb 336 25 0 19 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 97 0 0 7 0 7 7 0 8 0 art_table 32 98 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1588 0 189 88 0 88 88 0 8 0 ffsino 240 1588 0 189 83 0 83 83 0 8 0 nchpl 144 1975 0 425 59 0 59 59 0 8 0 uvmvnodes 80 1597 0 0 33 0 33 33 0 8 0 vnodes 216 1597 0 0 89 0 89 89 0 8 0 namei 1024 5106 0 5103 3 1 2 2 0 8 0 kstatmem 264 6 0 0 1 0 1 1 0 8 0 scxspl 216 5612 0 5612 10 9 1 8 0 8 1 plimitpl 152 15 0 9 1 0 1 1 0 8 0 sigapl 424 375 0 331 6 0 6 6 0 8 0 futexpl 64 529 0 524 1 0 1 1 0 8 0 knotepl 120 10868 0 10839 3 1 2 2 0 8 1 kqueuepl 184 20 0 13 1 0 1 1 0 8 0 pipepl 288 83 0 80 2 1 1 1 0 8 0 fdescpl 432 359 0 332 4 0 4 4 0 8 0 filepl 120 1384 0 1318 3 0 3 3 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 104 64 0 54 1 0 1 1 0 8 0 zombiepl 144 332 0 331 2 1 1 1 0 8 0 processpl 1000 375 0 331 7 1 6 6 0 8 0 procpl 672 478 0 427 5 0 5 5 0 8 0 sockpl 456 79 0 57 3 0 3 3 0 8 0 mcl8k 8192 9 0 9 2 1 1 1 0 8 1 mcl4k 4096 5 0 5 2 1 1 1 0 8 1 mcl2k 2048 10888 0 10849 8 1 7 7 0 8 1 mtagpl 96 4 0 4 1 1 0 1 0 8 0 mbufpl 256 19574 0 19492 7 0 7 7 0 8 0 bufpl 288 2540 0 80 176 0 176 176 0 8 0 anonpl 24 48023 0 44962 23 3 20 20 0 188 0 amapchunkpl 152 3472 0 3278 10 1 9 9 0 158 0 amappl16 200 102 0 80 2 0 2 2 0 8 0 amappl15 192 68 0 61 1 0 1 1 0 8 0 amappl13 176 33 0 32 2 1 1 1 0 8 0 amappl12 168 6 0 5 1 0 1 1 0 8 0 amappl11 160 38 0 28 1 0 1 1 0 8 0 amappl10 152 2 0 2 2 1 1 1 0 8 1 amappl9 144 939 0 939 2 1 1 1 0 8 1 amappl8 136 383 0 370 1 0 1 1 0 8 0 amappl7 128 64 0 57 1 0 1 1 0 8 0 amappl6 120 108 0 95 1 0 1 1 0 8 0 amappl5 112 83 0 76 1 0 1 1 0 8 0 amappl4 104 635 0 611 1 0 1 1 0 8 0 amappl3 96 627 0 578 2 0 2 2 0 8 0 amappl2 88 338 0 296 3 1 2 2 0 8 1 amappl1 80 10782 0 10154 17 3 14 14 0 8 0 amappl 88 1349 0 1273 2 0 2 2 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 359 0 332 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 359 0 332 1 0 1 1 0 8 0 vmmpekpl 168 7129 0 7115 1 0 1 1 0 8 0 vmmpepl 168 32101 0 30509 81 5 76 76 0 357 0 vmsppl 272 358 0 332 3 1 2 2 0 8 0 rwobjpl 24 11520 0 9145 15 0 15 15 0 8 0 pdppl 4096 724 0 664 90 26 64 64 0 8 4 pvpl 32 140480 0 134442 59 7 52 52 0 265 0 pmappl 216 358 0 332 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 479 0 34 13 0 13 13 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82583a2a) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002178dbb8) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd1510,fffffd806c624200,ffff80002178dd88,fffffd806c624560,fffffd806c624638,ffff80002178dcd8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff80002172dce8,3,20000180,5,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002178df20) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xce67b0ee9f0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82583a2a) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002178dbb8) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd1510,fffffd806c624200,ffff80002178dd88,fffffd806c624560,fffffd806c624638,ffff80002178dcd8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff80002172dce8,3,20000180,5,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002178df20) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xce67b0ee9f0, count: -7 ddb>