panic: ufs_rename: lost dir entry Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 1172 31906 60929 0x1010 0x4080000 0 syz-executor.2 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8256de7e) at panic+0x161 sys/kern/subr_prf.c:202 ufs_rename(ffff800026387278) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:921 VOP_RENAME(fffffd80758f5a88,fffffd8074c988d8,ffff800026387448,fffffd80758f5a88,0,ffff800026387398) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:386 dorenameat(ffff80002167fa48,ffffff9c,200000c0,ffffff9c,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3022 syscall(ffff8000263875e0) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc2a4fb5a530, 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:440 panic(ffffffff8256de7e) at panic+0x161 sys/kern/subr_prf.c:202 ufs_rename(ffff800026387278) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:921 VOP_RENAME(fffffd80758f5a88,fffffd8074c988d8,ffff800026387448,fffffd80758f5a88,0,ffff800026387398) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:386 dorenameat(ffff80002167fa48,ffffff9c,200000c0,ffffff9c,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3022 syscall(ffff8000263875e0) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc2a4fb5a530, count: -7 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800026387010 rbx 0xfffffd8067cc6700 rdx 0 rcx 0 rax 0xffff80002167fa48 r8 0x101010101010101 r9 0x8080808080808080 r10 0x2fc7441eaee348bd r11 0x789b41f8dc304aa5 r12 0 r13 0xfffffd807eacef10 r14 0 r15 0x1 rip 0xffffffff82520198 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800026387000 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.2) pid=1172 stat=onproc flags process=1010 proc=4080000 pri=17, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff9268,0xffff8000246dcd30 process=0xffff800021674808 user=0xffff800026382000, vmspace=0xfffffd806d085bb0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 16583 258371 18098 0 3 0x80 nanoslp syz-executor.4 16583 119095 18098 0 3 0x4000080 ttyretype syz-executor.4 16583 226024 18098 0 3 0x4000080 fsleep syz-executor.4 31906 140532 84598 60929 2 0x4081010 syz-executor.2 *31906 1172 84598 60929 7 0x4081010 syz-executor.2 31906 220562 84598 60929 3 0x4003010 suspend syz-executor.2 8713 22820 83357 0 2 0 syz-executor.1 8713 472192 83357 0 2 0x4000000 syz-executor.1 8713 302844 83357 0 2 0x4000000 syz-executor.1 8713 417562 83357 0 2 0x4000000 syz-executor.1 99780 366961 5874 0 2 0 syz-executor.0 99780 418727 5874 0 3 0x4000080 fsleep syz-executor.0 84598 338497 22211 0 3 0x82 nanoslp syz-executor.2 32261 129419 1 0 3 0x100083 ttyin getty 74940 278875 22211 0 3 0x82 piperd syz-executor.7 99519 164516 22211 0 3 0x82 piperd syz-executor.6 88152 179675 22211 0 3 0x82 piperd syz-executor.3 18098 47578 22211 0 3 0x82 nanoslp syz-executor.4 70411 325229 0 0 3 0x14280 nfsidl nfsio 51439 367664 0 0 3 0x14280 nfsidl nfsio 3247 223993 0 0 3 0x14280 nfsidl nfsio 95547 91162 0 0 3 0x14280 nfsidl nfsio 12006 163953 0 0 3 0x14280 nfsidl nfsio 10942 405351 0 0 3 0x14280 nfsidl nfsio 74120 185814 0 0 3 0x14280 nfsidl nfsio 52928 524288 0 0 3 0x14280 nfsidl nfsio 4497 36921 0 0 3 0x14280 nfsidl nfsio 65988 2966 0 0 3 0x14280 nfsidl nfsio 736 39270 0 0 3 0x14280 nfsidl nfsio 80666 493538 0 0 3 0x14280 nfsidl nfsio 73087 451847 0 0 3 0x14280 nfsidl nfsio 63568 457778 0 0 3 0x14280 nfsidl nfsio 14473 180422 0 0 3 0x14280 nfsidl nfsio 82862 374133 0 0 3 0x14280 nfsidl nfsio 49541 278316 0 0 3 0x14280 nfsidl nfsio 83056 220152 0 0 3 0x14280 nfsidl nfsio 45436 44062 0 0 3 0x14280 nfsidl nfsio 25043 401414 0 0 3 0x14280 nfsidl nfsio 75073 486844 0 0 3 0x14200 bored sosplice 83357 144530 22211 0 3 0x82 nanoslp syz-executor.1 24658 450390 22211 0 3 0x82 piperd syz-executor.5 5874 389446 22211 0 3 0x82 nanoslp syz-executor.0 22211 432511 32658 0 3 0x82 thrsleep syz-fuzzer 22211 177505 32658 0 3 0x4000082 nanoslp syz-fuzzer 22211 93474 32658 0 3 0x4000082 thrsleep syz-fuzzer 22211 381799 32658 0 3 0x4000082 thrsleep syz-fuzzer 22211 475578 32658 0 3 0x4000082 thrsleep syz-fuzzer 22211 98525 32658 0 3 0x4000082 thrsleep syz-fuzzer 22211 512048 32658 0 3 0x4000082 kqread syz-fuzzer 22211 226678 32658 0 3 0x4000082 thrsleep syz-fuzzer 32658 50185 92243 0 3 0x10008a sigsusp ksh 92243 41550 89907 0 3 0x9a kqread sshd 89907 209119 1 0 3 0x88 kqread sshd 36331 429047 75712 73 3 0x1100090 kqread syslogd 75712 11214 1 0 3 0x100082 netio syslogd 64955 331865 1 0 3 0x100080 kqread resolvd 17002 258532 21637 77 3 0x100092 kqread dhcpleased 5904 65165 21637 77 3 0x100092 kqread dhcpleased 21637 201113 1 0 3 0x80 kqread dhcpleased 51370 155874 0 0 3 0x14200 bored smr 25353 138712 0 0 2 0x14200 zerothread 64159 427297 0 0 3 0x14200 aiodoned aiodoned 68863 302458 0 0 3 0x14200 syncer update 55391 78591 0 0 3 0x14200 cleaner cleaner 41762 389867 0 0 3 0x14200 reaper reaper 49708 182322 0 0 3 0x14200 pgdaemon pagedaemon 77875 370052 0 0 3 0x14200 bored viomb 16829 304492 0 0 3 0x40014200 acpi0 acpi0 39596 345402 0 0 3 0x14200 bored softnet 11348 365295 0 0 3 0x14200 bored systqmp 35613 238406 0 0 3 0x14200 bored systq 53565 336010 0 0 3 0x40014200 bored softclock 41245 175760 0 0 3 0x40014200 idle0 1 515370 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 10193 6488K 6945K 78643K 19638 0 pcb 13 18K 20K 78643K 1079 0 rtable 223 14K 15K 78643K 1259 0 ifaddr 90 19K 20K 78643K 443 0 sysctl 2 0K 0K 78643K 2 0 counters 28 17K 17K 78643K 97 0 ioctlops 0 0K 4K 78643K 489 0 iov 0 0K 32K 78643K 828 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1401 88K 88K 78643K 3935 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 52 0 VM map 2 0K 0K 78643K 2 0 sem 12 1K 1K 78643K 827 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 14 49K 77K 78643K 5813 0 sigio 0 0K 0K 78643K 52 0 proc 59 55K 79K 78643K 1092 0 subproc 104 6K 6K 78643K 299 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 327 0 in_multi 82 5K 6K 78643K 444 0 ether_multi 1 0K 0K 78643K 71 0 mrt 1 0K 0K 78643K 7 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 175 784K 784K 78643K 175 0 exec 0 0K 2K 78643K 1732 0 pfkey data 0 0K 0K 78643K 3 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 7 26K 26K 78643K 7 0 UVM amap 446 639K 708K 78643K 72723 0 UVM aobj 131 5K 5K 78643K 142 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 238 0 NDP 13 0K 1K 78643K 134 0 temp 134 4707K 4779K 78643K 56564 0 kqueue 12 18K 26K 78643K 391 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 120 401 0 398 5 4 1 3 0 8 0 rtentry 112 357 0 258 4 1 3 4 0 8 0 unpcb 136 4018 0 4005 42 40 2 8 0 8 1 syncache 296 19 0 19 6 6 0 1 0 8 0 tcpqe 32 153 0 153 3 3 0 1 0 8 0 tcpcb 736 5765 0 5740 127 119 8 22 0 8 5 arp 88 63 0 43 1 0 1 1 0 8 0 ipq 40 7 0 7 2 2 0 1 0 8 0 ipqe 40 92 0 92 2 2 0 1 0 8 0 inpcb 312 16018 0 16009 151 142 9 21 0 8 8 rttmr 72 3 0 3 1 1 0 1 0 8 0 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 3 0 3 1 1 0 1 0 8 0 nd6 48 79 0 59 1 0 1 1 0 8 0 pkpcb 40 23 0 23 4 4 0 1 0 8 0 kcovpl 48 23 0 15 1 0 1 1 0 8 0 ppxss 1152 35 0 35 5 5 0 1 0 8 0 pfrule 1360 4 0 1 1 0 1 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 1508 0 1083 42 15 27 30 0 8 0 art_table 32 1511 0 1083 4 0 4 4 0 8 0 art_node 16 356 0 269 1 0 1 1 0 8 0 sysvmsgpl 40 28 0 7 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 821 0 811 1 0 1 1 0 8 0 shmpl 112 139 0 11 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 9420 0 7949 93 0 93 93 0 8 0 ffsino 240 9420 0 7949 87 0 87 87 0 8 0 nchpl 144 17410 0 16936 63 41 22 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 59996 0 59993 4 2 2 2 0 8 1 vcpupl 1984 37 0 0 5 0 5 5 0 8 0 vmpool 528 67 0 30 3 0 3 3 0 8 0 scxspl 216 53084 0 53084 18 17 1 8 0 8 1 plimitpl 152 758 0 743 1 0 1 1 0 8 0 sigapl 424 6089 0 6030 9 1 8 8 0 8 0 futexpl 64 66133 0 66131 1 0 1 1 0 8 0 knotepl 120 60567 0 60487 23 18 5 7 0 8 0 kqueuepl 184 1427 0 1417 19 18 1 4 0 8 0 pipepl 304 1983 0 1955 49 43 6 13 0 8 3 fdescpl 432 6055 0 6030 4 0 4 4 0 8 0 filepl 120 50195 0 49936 60 48 12 18 0 8 1 lockfpl 104 1125 0 1123 3 2 1 2 0 8 0 lockfspl 48 315 0 313 1 0 1 1 0 8 0 sessionpl 144 39 0 23 1 0 1 1 0 8 0 pgrppl 48 51 0 35 1 0 1 1 0 8 0 ucredpl 96 5229 0 5218 1 0 1 1 0 8 0 zombiepl 144 6031 0 6030 1 0 1 1 0 8 0 processpl 1000 6089 0 6030 8 0 8 8 0 8 0 procpl 672 15291 0 15216 20 12 8 9 0 8 1 sosppl 168 38 0 37 9 8 1 1 0 8 0 sockpl 448 20551 0 20527 331 320 11 32 0 8 8 mcl64k 65536 278 0 278 7 7 0 1 0 8 0 mcl16k 16384 66 0 66 13 13 0 1 0 8 0 mcl12k 12288 208 0 208 10 10 0 1 0 8 0 mcl9k 9216 166 0 166 9 9 0 1 0 8 0 mcl8k 8192 380 0 380 6 5 1 1 0 8 1 mcl4k 4096 628 0 628 4 3 1 1 0 8 1 mcl2k2 2112 61 0 61 11 11 0 1 0 8 0 mcl2k 2048 86313 0 86265 20 13 7 12 0 8 0 mtagpl 96 1320 0 1119 16 8 8 9 0 8 0 mbufpl 256 185332 0 184921 74 38 36 53 0 8 0 bufpl 288 14600 0 8193 458 0 458 458 0 8 0 anonpl 24 1757294 0 1739043 234 85 149 166 0 188 14 amapchunkpl 152 237773 0 236983 666 625 41 347 0 158 6 amappl16 200 21055 0 20304 133 82 51 61 0 8 8 amappl15 192 567 0 559 1 0 1 1 0 8 0 amappl14 184 1344 0 1339 1 0 1 1 0 8 0 amappl13 176 893 0 891 1 0 1 1 0 8 0 amappl12 168 220 0 217 1 0 1 1 0 8 0 amappl11 160 1187 0 1174 1 0 1 1 0 8 0 amappl10 152 795 0 792 1 0 1 1 0 8 0 amappl9 144 1289 0 1284 1 0 1 1 0 8 0 amappl8 136 1164 0 1077 4 0 4 4 0 8 0 amappl7 128 371 0 359 1 0 1 1 0 8 0 amappl6 120 1038 0 1015 2 1 1 2 0 8 0 amappl5 112 5207 0 5192 1 0 1 1 0 8 0 amappl4 104 3521 0 3490 2 0 2 2 0 8 0 amappl3 96 993 0 979 1 0 1 1 0 8 0 amappl2 88 1870 0 1808 3 1 2 3 0 8 0 amappl1 80 111894 0 111347 18 5 13 18 0 8 0 amappl 88 71783 0 71514 7 0 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 72 141 0 11 3 0 3 3 0 8 0 uaddrrnd 24 6122 0 6060 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6122 0 6060 1 0 1 1 0 8 0 vmmpekpl 168 47146 0 47089 3 0 3 3 0 8 0 vmmpepl 168 559954 0 557354 240 102 138 159 0 357 11 vmsppl 272 6121 0 6060 7 2 5 5 0 8 0 rwobjpl 24 141247 0 133430 49 0 49 49 0 8 0 pdppl 4096 12250 0 12157 378 277 101 101 0 8 8 pvpl 32 2907526 0 2885755 390 158 232 259 0 265 20 pmappl 216 6121 0 6060 4 0 4 4 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1812 0 958 25 0 25 25 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:440 panic(ffffffff8256de7e) at panic+0x161 sys/kern/subr_prf.c:202 ufs_rename(ffff800026387278) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:921 VOP_RENAME(fffffd80758f5a88,fffffd8074c988d8,ffff800026387448,fffffd80758f5a88,0,ffff800026387398) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:386 dorenameat(ffff80002167fa48,ffffff9c,200000c0,ffffff9c,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3022 syscall(ffff8000263875e0) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc2a4fb5a530, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8256de7e) at panic+0x161 sys/kern/subr_prf.c:202 ufs_rename(ffff800026387278) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:921 VOP_RENAME(fffffd80758f5a88,fffffd8074c988d8,ffff800026387448,fffffd80758f5a88,0,ffff800026387398) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:386 dorenameat(ffff80002167fa48,ffffff9c,200000c0,ffffff9c,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3022 syscall(ffff8000263875e0) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc2a4fb5a530, count: -7