panic: ufs_rename: lost dir entry Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 60832 44893 0 0x1000 0x4080000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82589d52) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e94ac68) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd16c0,fffffd806c992700,ffff80002e94ae38,fffffd8061f64008,fffffd8072978a60,ffff80002e94ad88) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff8000216f07e0,3,20001640,5,20001680) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e94afd0) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbcc26a1dae0, 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(ffffffff82589d52) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e94ac68) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd16c0,fffffd806c992700,ffff80002e94ae38,fffffd8061f64008,fffffd8072978a60,ffff80002e94ad88) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff8000216f07e0,3,20001640,5,20001680) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e94afd0) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbcc26a1dae0, count: -7 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002e94aa00 rbx 0xfffffd8072978a60 rdx 0 rcx 0 rax 0xffff8000216f07e0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x29d6b5e4f66fb5b r11 0x6da5841aa974bee5 r12 0 r13 0xfffffd806966df08 r14 0 r15 0x1 rip 0xffffffff82435818 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e94a9f0 ss 0 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=60832 stat=onproc flags process=1000 proc=4080000 pri=17, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800024c28d30,0xffff8000216f1a50 process=0xffff8000231d2800 user=0xffff80002e946000, vmspace=0xfffffd807a439228 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *44893 60832 61914 0 7 0x4081000 syz-executor.1 44893 119150 61914 0 3 0x4003000 suspend syz-executor.1 83310 46257 32929 0 3 0x80 nanoslp syz-executor.6 83310 23941 32929 0 3 0x4000080 netio syz-executor.6 83310 88430 32929 0 3 0x4000080 fsleep syz-executor.6 61914 518835 80902 0 3 0x82 nanoslp syz-executor.1 21842 255577 1 0 3 0x100083 ttyopn getty 87873 313273 80902 0 2 0x2 syz-executor.4 57790 305668 0 0 3 0x14200 acct acct 27860 86435 80902 0 2 0x2 syz-executor.7 32929 495995 80902 0 2 0x2 syz-executor.6 25853 311153 80902 0 2 0x2 syz-executor.5 30952 181463 80902 0 2 0x2 syz-executor.2 78779 123120 80902 0 3 0x82 piperd syz-executor.3 12208 59133 80902 0 2 0x2 syz-executor.0 51164 291879 0 0 3 0x14200 bored sosplice 80902 222157 50008 0 3 0x82 thrsleep syz-fuzzer 80902 410586 50008 0 2 0x4000002 syz-fuzzer 80902 468292 50008 0 3 0x4000082 thrsleep syz-fuzzer 80902 76937 50008 0 3 0x4000082 thrsleep syz-fuzzer 80902 242642 50008 0 3 0x4000082 wait syz-fuzzer 80902 352437 50008 0 3 0x4000082 wait syz-fuzzer 80902 408720 50008 0 3 0x4000082 wait syz-fuzzer 80902 221984 50008 0 3 0x4000082 wait syz-fuzzer 80902 105680 50008 0 3 0x4000082 thrsleep syz-fuzzer 80902 232901 50008 0 3 0x4000082 wait syz-fuzzer 80902 283661 50008 0 3 0x4000082 wait syz-fuzzer 80902 476661 50008 0 3 0x4000082 wait syz-fuzzer 80902 252290 50008 0 3 0x4000082 wait syz-fuzzer 80902 49780 50008 0 3 0x4000082 thrsleep syz-fuzzer 80902 468984 50008 0 2 0x4000002 syz-fuzzer 50008 57811 78576 0 3 0x10008a sigsusp ksh 78576 362944 98215 0 3 0x9a kqread sshd 98215 68232 1 0 3 0x88 kqread sshd 90873 110273 39368 73 3 0x1100090 kqread syslogd 39368 175017 1 0 3 0x100082 netio syslogd 29109 257849 1 0 3 0x100080 kqread resolvd 75591 241060 8475 77 3 0x100092 kqread dhcpleased 61360 329329 8475 77 3 0x100092 kqread dhcpleased 8475 479039 1 0 3 0x80 kqread dhcpleased 49087 501357 0 0 3 0x14200 bored smr 11606 382370 0 0 2 0x14200 zerothread 17562 434195 0 0 3 0x14200 aiodoned aiodoned 77519 293482 0 0 3 0x14200 syncer update 19060 59055 0 0 3 0x14200 cleaner cleaner 34177 268421 0 0 3 0x14200 reaper reaper 24414 131920 0 0 3 0x14200 pgdaemon pagedaemon 53417 318750 0 0 3 0x14200 bored viomb 97739 304479 0 0 3 0x40014200 acpi0 acpi0 72844 145151 0 0 3 0x14200 bored softnet 63504 163942 0 0 3 0x14200 bored softnet 18136 200106 0 0 3 0x14200 bored softnet 64649 464207 0 0 3 0x14200 bored softnet 64419 298441 0 0 3 0x14200 bored systqmp 83002 11395 0 0 3 0x14200 bored systq 40686 442367 0 0 3 0x40014200 bored softclock 1300 427867 0 0 3 0x40014200 idle0 1 256602 0 0 3 0x80082 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 10232 6567K 8809K 78643K 111566 0 pcb 13 22K 26K 78643K 2670 0 rtable 156 15K 17K 78643K 3982 0 ifaddr 151 35K 38K 78643K 1627 0 sysctl 3 1K 1K 78643K 9 0 counters 27 17K 17K 78643K 821 0 ioctlops 0 0K 4K 78643K 8739 0 iov 0 0K 28K 78643K 3326 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1818 114K 114K 78643K 35018 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 13K 78643K 149 0 VM map 2 0K 0K 78643K 2 0 sem 23 16K 32K 78643K 1518 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 12 41K 69K 78643K 18698 0 sigio 0 0K 0K 78643K 216 0 proc 60 59K 83K 78643K 3063 0 subproc 104 6K 10K 78643K 1136 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1522 0 in_multi 52 3K 6K 78643K 1227 0 ether_multi 1 0K 0K 78643K 101 0 mrt 1 0K 0K 78643K 70 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 229 1023K 1023K 78643K 229 0 exec 0 0K 1K 78643K 3683 0 pfkey data 0 0K 0K 78643K 10 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 597 1681K 1682K 78643K 119681 0 UVM aobj 130 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 499 0 NDP 14 0K 2K 78643K 447 0 temp 137 4694K 70231K 78643K 209858 0 kqueue 12 18K 26K 78643K 1375 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 1672 0 1669 26 25 1 3 0 8 0 rtentry 112 1265 0 1207 4 1 3 4 0 8 0 unpcb 144 19241 0 19228 194 188 6 10 0 8 5 syncache 296 139 0 139 39 38 1 1 0 8 1 tcpqe 32 160 0 160 22 21 1 1 0 8 1 tcpcb 776 5469 0 5465 220 212 8 14 0 8 7 arp 88 169 0 159 1 0 1 1 0 8 0 ipq 40 23 0 23 8 8 0 1 0 8 0 ipqe 40 99 0 99 8 8 0 1 0 8 0 inpcb 336 17143 0 17135 280 273 7 18 0 8 6 nd6 48 262 0 250 1 0 1 1 0 8 0 pkpcb 40 130 0 130 12 12 0 1 0 8 0 kcovpl 48 79 0 71 1 0 1 1 0 8 0 mppekey 1024 212 0 212 8 8 0 1 0 8 0 ppxss 1160 606 0 606 41 41 0 1 0 8 0 pppxif 1608 379 0 379 28 28 0 1 0 8 0 pfstscr 40 310 0 284 1 0 1 1 0 8 0 pfosfp 40 66 0 60 1 0 1 1 0 8 0 pfosfpen 112 66 0 6 2 0 2 2 0 8 0 pfanchor 1280 671 0 326 36 4 32 34 0 8 0 pfqueue 264 5 0 5 2 2 0 1 0 8 0 pfstitem 24 303 0 260 1 0 1 1 0 8 0 pfstkey 120 491 0 482 1 0 1 1 0 8 0 pfstate 352 248 0 225 7 4 3 3 0 8 0 rttmr 136 15 0 15 4 4 0 1 0 8 0 art_heap8 4096 14 0 13 12 11 1 2 0 8 0 art_heap4 256 5116 0 4867 65 40 25 29 0 8 1 art_table 32 5130 0 4880 4 0 4 4 0 8 0 art_node 16 1258 0 1209 1 0 1 1 0 8 0 sysvmsgpl 40 64 0 57 2 1 1 1 0 8 0 semupl 112 5 0 5 2 2 0 1 0 8 0 semapl 112 1511 0 1490 1 0 1 1 0 8 0 shmpl 112 128 0 1 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 26177 0 24680 94 0 94 94 0 8 0 ffsino 240 26177 0 24680 89 0 89 89 0 8 0 nchpl 144 51086 0 49469 63 1 62 63 0 8 0 rtmask 32 7 0 7 3 3 0 1 0 8 0 uvmvnodes 80 6741 0 0 138 0 138 138 0 8 0 vnodes 216 6741 0 0 375 0 375 375 0 8 0 namei 1024 210302 0 210298 18 17 1 2 0 8 0 vcpupl 2048 409 0 1 51 0 51 51 0 8 0 vmpool 536 527 0 119 28 0 28 28 0 8 0 kstatmem 264 550 0 522 17 14 3 3 0 8 0 scsiplug 72 16 0 16 7 7 0 1 0 8 0 scxspl 216 157088 0 157088 30 29 1 8 0 8 1 plimitpl 152 2587 0 2572 1 0 1 1 0 8 0 sigapl 424 18860 0 18819 8 1 7 8 0 8 0 futexpl 64 183214 0 183213 6 5 1 1 0 8 0 knotepl 120 235939 0 235859 93 89 4 12 0 8 0 kqueuepl 184 5132 0 5124 76 75 1 4 0 8 0 pipepl 288 4243 0 4215 110 107 3 11 0 8 0 fdescpl 432 18817 0 18794 5 1 4 4 0 8 0 filepl 120 157376 0 157073 229 217 12 23 0 8 2 lockfpl 104 5787 0 5785 14 13 1 2 0 8 0 lockfspl 48 1401 0 1399 1 0 1 1 0 8 0 sessionpl 144 99 0 83 1 0 1 1 0 8 0 pgrppl 48 289 0 273 1 0 1 1 0 8 0 ucredpl 104 16076 0 16064 1 0 1 1 0 8 0 zombiepl 144 18820 0 18819 4 3 1 1 0 8 0 processpl 1000 18860 0 18819 10 3 7 9 0 8 0 procpl 672 46676 0 46617 34 27 7 9 0 8 0 sosppl 168 187 0 187 31 30 1 1 0 8 1 sockpl 456 38200 0 38176 950 939 11 37 0 8 8 mcl64k 65536 599 0 599 46 45 1 1 0 8 1 mcl16k 16384 266 0 266 47 47 0 1 0 8 0 mcl12k 12288 537 0 537 42 41 1 1 0 8 1 mcl9k 9216 202 0 202 45 44 1 1 0 8 1 mcl8k 8192 1304 0 1304 34 33 1 1 0 8 1 mcl4k 4096 1859 0 1859 34 33 1 1 0 8 1 mcl2k2 2112 200 0 200 52 51 1 1 0 8 1 mcl2k 2048 111394 0 111314 83 71 12 33 0 8 0 mtagpl 96 19979 0 18758 109 73 36 36 0 8 0 mbufpl 256 475532 0 474146 2760 2648 112 608 0 8 8 bufpl 288 34817 0 28038 485 0 485 485 0 8 0 anonpl 24 3543640 0 3526253 305 184 121 169 0 188 0 amapchunkpl 152 372881 0 372154 213 178 35 60 0 158 0 amappl16 200 32227 0 31577 229 194 35 58 0 8 0 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 445 0 433 2 0 2 2 0 8 0 amappl13 176 7 0 6 1 0 1 1 0 8 0 amappl12 168 1263 0 1258 1 0 1 1 0 8 0 amappl11 160 52 0 41 1 0 1 1 0 8 0 amappl10 152 116 0 108 1 0 1 1 0 8 0 amappl9 144 1108 0 1105 1 0 1 1 0 8 0 amappl8 136 748 0 642 4 0 4 4 0 8 0 amappl7 128 89 0 69 1 0 1 1 0 8 0 amappl6 120 1077 0 1057 2 1 1 2 0 8 0 amappl5 112 312 0 304 1 0 1 1 0 8 0 amappl4 104 1458 0 1428 2 0 2 2 0 8 0 amappl3 96 53110 0 53066 2 0 2 2 0 8 0 amappl2 88 20418 0 20348 3 1 2 3 0 8 0 amappl1 80 419852 0 419221 23 7 16 21 0 8 0 amappl 88 118289 0 118015 8 1 7 7 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 72 130 0 1 3 0 3 3 0 8 0 uaddrrnd 24 19344 0 18913 3 0 3 3 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 19344 0 18913 3 0 3 3 0 8 0 vmmpekpl 168 120266 0 120141 7 1 6 6 0 8 0 vmmpepl 168 1709928 0 1706802 503 345 158 170 0 357 0 vmsppl 272 19343 0 18913 31 1 30 30 0 8 1 rwobjpl 24 436555 0 427839 64 9 55 55 0 8 0 pdppl 4096 38694 0 38234 1378 906 472 472 0 8 12 pvpl 32 6931197 0 6909327 650 450 200 295 0 265 0 pmappl 216 19343 0 18913 27 2 25 25 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 5631 0 4242 75 34 41 45 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(ffffffff82589d52) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e94ac68) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd16c0,fffffd806c992700,ffff80002e94ae38,fffffd8061f64008,fffffd8072978a60,ffff80002e94ad88) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff8000216f07e0,3,20001640,5,20001680) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e94afd0) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbcc26a1dae0, 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(ffffffff82589d52) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e94ac68) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd16c0,fffffd806c992700,ffff80002e94ae38,fffffd8061f64008,fffffd8072978a60,ffff80002e94ad88) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff8000216f07e0,3,20001640,5,20001680) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e94afd0) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbcc26a1dae0, count: -7