panic: ufs_rename: lost dir entry Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *323142 76036 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827358c5) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff8000299c7838) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd0000,fffffd80738ae438,ffff8000299c7a08,fffffd806d8047a8,fffffd807d8ad478,ffff8000299c7958) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff8000216b7b58,3,20000180,7,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff8000299c7ba0) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x220dd97ca70, 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(ffffffff827358c5) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff8000299c7838) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd0000,fffffd80738ae438,ffff8000299c7a08,fffffd806d8047a8,fffffd807d8ad478,ffff8000299c7958) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff8000216b7b58,3,20000180,7,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff8000299c7ba0) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x220dd97ca70, count: -7 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000299c75d0 rbx 0xfffffd806ebca0e0 rdx 0 rcx 0 rax 0xffff8000216b7b58 r8 0x101010101010101 r9 0x8080808080808080 r10 0x3c3fdd32b3d1cb8f r11 0x53d1b05d3b989f35 r12 0 r13 0xfffffd8067cdb3d0 r14 0 r15 0x1 rip 0xffffffff823c56e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000299c75c0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=323142 stat=onproc flags process=0 proc=4000000 pri=17, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000216b6598,0xffff800021711090 process=0xffff800021721b98 user=0xffff8000299c2000, vmspace=0xfffffd806ba07450 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 5507 109961 44976 0 2 0 syz-executor.4 97547 440220 14327 0 2 0 syz-executor.5 97547 444873 14327 0 3 0x4000080 fsleep syz-executor.5 48550 151594 14844 0 3 0x80 nanoslp syz-executor.3 48550 35317 14844 0 3 0x4000080 fsleep syz-executor.3 76036 83212 87978 0 3 0x80 nanoslp syz-executor.1 *76036 323142 87978 0 7 0x4000000 syz-executor.1 76036 374516 87978 0 3 0x4000080 fsleep syz-executor.1 76036 32025 87978 0 3 0x4000080 fsleep syz-executor.1 71164 473753 17462 0 2 0 syz-executor.7 71164 31933 17462 0 2 0x4000000 syz-executor.7 31042 101846 6807 0 3 0x80 nanoslp syz-executor.0 31042 522876 6807 0 3 0x4000080 fsleep syz-executor.0 31042 190321 6807 0 3 0x4000080 fsleep syz-executor.0 93909 148877 95279 0 3 0x82 nanoslp syz-executor.6 86306 47801 0 0 3 0x14280 nfsidl nfsio 97783 351903 0 0 3 0x14280 nfsidl nfsio 18189 212532 0 0 3 0x14280 nfsidl nfsio 2813 219575 0 0 3 0x14280 nfsidl nfsio 48194 133417 0 0 3 0x14280 nfsidl nfsio 50213 204211 0 0 3 0x14280 nfsidl nfsio 67159 473939 0 0 3 0x14280 nfsidl nfsio 67727 186181 0 0 3 0x14280 nfsidl nfsio 15899 160959 0 0 3 0x14280 nfsidl nfsio 59246 358559 0 0 3 0x14280 nfsidl nfsio 69457 181203 0 0 3 0x14280 nfsidl nfsio 39205 148113 0 0 3 0x14280 nfsidl nfsio 107 381647 0 0 3 0x14280 nfsidl nfsio 20580 350771 0 0 3 0x14280 nfsidl nfsio 52923 327555 0 0 3 0x14280 nfsidl nfsio 19912 235301 0 0 3 0x14280 nfsidl nfsio 54119 133148 0 0 3 0x14280 nfsidl nfsio 95406 314144 0 0 3 0x14280 nfsidl nfsio 52304 301312 0 0 3 0x14280 nfsidl nfsio 88238 473893 0 0 3 0x14280 nfsidl nfsio 14327 253158 95279 0 3 0x82 nanoslp syz-executor.5 14844 252753 95279 0 3 0x82 nanoslp syz-executor.3 94473 84839 95279 0 3 0x82 nanoslp syz-executor.2 6807 334226 95279 0 3 0x82 nanoslp syz-executor.0 17462 228319 95279 0 3 0x82 nanoslp syz-executor.7 42232 323342 1 0 3 0x100083 ttyin getty 92233 44937 0 0 3 0x14200 bored sosplice 87978 314590 95279 0 3 0x82 nanoslp syz-executor.1 44976 19930 95279 0 2 0x2 syz-executor.4 95279 166867 74686 0 3 0x82 wait syz-fuzzer 95279 507321 74686 0 3 0x4000082 nanoslp syz-fuzzer 95279 282611 74686 0 3 0x4000082 wait syz-fuzzer 95279 348433 74686 0 3 0x4000082 thrsleep syz-fuzzer 95279 203235 74686 0 3 0x4000082 wait syz-fuzzer 95279 495023 74686 0 3 0x4000082 thrsleep syz-fuzzer 95279 225353 74686 0 3 0x4000082 wait syz-fuzzer 95279 236413 74686 0 3 0x4000082 wait syz-fuzzer 95279 385219 74686 0 3 0x4000082 thrsleep syz-fuzzer 95279 270918 74686 0 3 0x4000082 wait syz-fuzzer 95279 290315 74686 0 3 0x4000082 thrsleep syz-fuzzer 95279 457638 74686 0 3 0x4000082 wait syz-fuzzer 95279 488750 74686 0 3 0x4000082 kqread syz-fuzzer 95279 34846 74686 0 3 0x4000082 wait syz-fuzzer 74686 205391 39916 0 3 0x10008a sigsusp ksh 39916 86117 61749 0 3 0x9a kqread sshd 61749 44784 1 0 3 0x88 kqread sshd 70678 23468 36593 73 3 0x1100090 kqread syslogd 36593 139770 1 0 3 0x100082 netio syslogd 3623 454786 1 0 3 0x100080 kqread resolvd 52188 136324 22718 77 3 0x100092 kqread dhcpleased 40844 337435 22718 77 3 0x100092 kqread dhcpleased 22718 342459 1 0 3 0x80 kqread dhcpleased 66371 401024 0 0 3 0x14200 bored smr 28935 87047 0 0 2 0x14200 zerothread 49417 486159 0 0 3 0x14200 aiodoned aiodoned 79820 266672 0 0 3 0x14200 syncer update 52971 328800 0 0 3 0x14200 cleaner cleaner 18861 39563 0 0 3 0x14200 reaper reaper 38270 103897 0 0 3 0x14200 pgdaemon pagedaemon 75558 174103 0 0 3 0x14200 bored viomb 18542 41421 0 0 3 0x40014200 acpi0 acpi0 56986 151179 0 0 3 0x14200 bored softnet 77481 503240 0 0 3 0x14200 bored softnet 44277 119287 0 0 3 0x14200 bored softnet 2787 339108 0 0 3 0x14200 bored softnet 13713 464683 0 0 3 0x14200 bored systqmp 9419 237318 0 0 3 0x14200 bored systq 79575 296237 0 0 3 0x40014200 bored softclock 89317 450064 0 0 3 0x40014200 idle0 1 177029 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 10210 6406K 6955K 78643K 20761 0 pcb 13 22K 27K 78643K 2207 0 rtable 198 16K 18K 78643K 1173 0 ifaddr 78 22K 24K 78643K 427 0 sysctl 3 1K 1K 78643K 3 0 counters 27 17K 17K 78643K 211 0 ioctlops 0 0K 4K 78643K 580 0 iov 0 0K 16K 78643K 851 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1431 89K 90K 78643K 6133 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 29 0 VM map 2 0K 0K 78643K 2 0 sem 10 3K 6K 78643K 32 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 16 57K 73K 78643K 6737 0 sigio 0 0K 0K 78643K 202 0 proc 59 59K 75K 78643K 936 0 subproc 104 6K 6K 78643K 221 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 847 0 in_multi 78 5K 7K 78643K 396 0 ether_multi 1 0K 0K 78643K 37 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 157 705K 705K 78643K 157 0 exec 0 0K 1K 78643K 1181 0 pfkey data 0 0K 0K 78643K 8 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 304 85K 99K 78643K 45148 0 UVM aobj 131 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 195 0 NDP 13 0K 2K 78643K 138 0 temp 132 5770K 6787K 78643K 36969 0 kqueue 14 22K 28K 78643K 1581 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 120 423 0 420 9 8 1 3 0 8 0 rtentry 112 379 0 297 4 0 4 4 0 8 0 unpcb 144 3546 0 3533 37 35 2 6 0 8 1 syncache 296 24 0 24 7 7 0 1 0 8 0 tcpqe 32 189 40 189 3 3 0 1 0 8 0 tcpcb 776 2172 0 2164 64 63 1 14 0 8 0 arp 88 36 0 20 1 0 1 1 0 8 0 inpcb 336 7150 0 7139 73 66 7 18 0 8 5 nd6 48 64 0 48 1 0 1 1 0 8 0 pkpcb 40 11 0 11 3 3 0 1 0 8 0 kcovpl 48 17 0 9 1 0 1 1 0 8 0 ppxss 1160 132 0 132 8 8 0 1 0 8 0 pppxif 1360 28 0 28 5 5 0 1 0 8 0 pfstscr 40 9 0 0 1 0 1 1 0 8 0 pfosfp 40 7 0 5 1 0 1 1 0 8 0 pfosfpen 112 7 0 5 1 0 1 1 0 8 0 pfanchor 1280 431 0 231 22 2 20 22 0 8 0 pfstitem 24 9 0 4 1 0 1 1 0 8 0 pfstkey 128 9 0 5 1 0 1 1 0 8 0 pfstate 352 6 0 0 1 0 1 1 0 8 0 art_heap8 4096 2 0 1 2 1 1 2 0 8 0 art_heap4 256 1851 0 1499 40 18 22 29 0 8 0 art_table 32 1853 0 1500 4 0 4 4 0 8 0 art_node 16 343 0 271 1 0 1 1 0 8 0 sysvmsgpl 40 61 0 35 2 1 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 12204 0 10754 91 0 91 91 0 8 0 ffsino 240 12204 0 10754 86 0 86 86 0 8 0 nchpl 144 24029 0 22408 63 0 63 63 0 8 0 rtmask 32 3 0 3 1 1 0 1 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 110234 0 110231 9 7 2 2 0 8 1 vmpool 664 44 0 44 6 6 0 1 0 8 0 kstatmem 264 184 0 158 4 2 2 3 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 65070 0 65070 16 15 1 8 0 8 1 plimitpl 152 709 0 694 1 0 1 1 0 8 0 sigapl 424 7269 0 7203 10 2 8 8 0 8 0 futexpl 64 89496 0 89490 2 1 1 1 0 8 0 knotepl 120 101471 0 101389 27 21 6 10 0 8 2 kqueuepl 184 2127 0 2117 12 11 1 4 0 8 0 pipepl 288 1172 0 1142 23 20 3 7 0 8 0 fdescpl 432 6992 0 6965 4 0 4 4 0 8 0 filepl 120 56375 0 56125 49 37 12 18 0 8 3 lockfpl 104 1157 0 1155 2 1 1 2 0 8 0 lockfspl 48 373 0 371 1 0 1 1 0 8 0 sessionpl 144 33 0 17 1 0 1 1 0 8 0 pgrppl 48 178 0 162 1 0 1 1 0 8 0 ucredpl 104 4007 0 3994 1 0 1 1 0 8 0 zombiepl 144 7205 0 7203 2 1 1 1 0 8 0 processpl 1008 7269 0 7203 13 4 9 9 0 8 0 procpl 696 18049 0 17962 14 5 9 10 0 8 0 sosppl 168 69 0 68 4 3 1 1 0 8 0 sockpl 456 11174 0 11147 221 209 12 28 0 8 8 mcl64k 65536 241 0 241 4 3 1 1 0 8 1 mcl16k 16384 117 0 117 7 6 1 1 0 8 1 mcl12k 12288 221 0 221 3 2 1 1 0 8 1 mcl9k 9216 70 0 70 12 11 1 1 0 8 1 mcl8k 8192 459 0 459 3 2 1 1 0 8 1 mcl4k 4096 1265 0 1265 2 1 1 1 0 8 1 mcl2k2 2112 56 0 56 8 7 1 1 0 8 1 mcl2k 2048 85648 0 85576 50 39 11 31 0 8 1 mtagpl 96 2132 0 1751 12 2 10 10 0 8 0 mbufpl 256 203737 0 203093 496 451 45 136 0 8 1 bufpl 288 14228 0 7831 458 0 458 458 0 8 0 anonpl 24 1325091 0 1308877 182 72 110 131 0 188 0 amapchunkpl 152 126217 0 125531 57 27 30 36 0 158 1 amappl16 200 12528 0 11952 78 46 32 44 0 8 0 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 180 0 169 2 0 2 2 0 8 0 amappl13 176 10 0 10 1 1 0 1 0 8 0 amappl12 168 515 0 512 1 0 1 1 0 8 0 amappl11 160 50 0 40 1 0 1 1 0 8 0 amappl10 152 44 0 32 1 0 1 1 0 8 0 amappl9 144 979 0 978 1 0 1 1 0 8 0 amappl8 136 228 0 164 3 0 3 3 0 8 0 amappl7 128 177 0 155 2 0 2 2 0 8 0 amappl6 120 210 0 200 1 0 1 1 0 8 0 amappl5 112 229 0 223 1 0 1 1 0 8 0 amappl4 104 634 0 604 2 1 1 2 0 8 0 amappl3 96 19938 0 19888 2 0 2 2 0 8 0 amappl2 88 7662 0 7593 3 1 2 3 0 8 0 amappl1 80 159305 0 158593 26 10 16 22 0 8 0 amappl 88 44466 0 44291 5 0 5 5 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 0 3 0 3 3 0 8 0 uaddrrnd 24 7036 0 7009 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 7036 0 7009 1 0 1 1 0 8 0 vmmpekpl 168 53336 0 53275 4 0 4 4 0 8 0 vmmpepl 168 633202 0 630517 193 60 133 145 0 357 10 vmsppl 272 7035 0 7009 4 2 2 3 0 8 0 rwobjpl 24 170757 0 163025 49 1 48 49 0 8 0 pdppl 4096 14078 0 14018 256 192 64 68 0 8 4 pvpl 32 2528757 0 2507129 372 177 195 253 0 265 1 pmappl 216 7035 0 7009 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1615 0 815 26 0 26 26 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(ffffffff827358c5) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff8000299c7838) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd0000,fffffd80738ae438,ffff8000299c7a08,fffffd806d8047a8,fffffd807d8ad478,ffff8000299c7958) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff8000216b7b58,3,20000180,7,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff8000299c7ba0) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x220dd97ca70, 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(ffffffff827358c5) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff8000299c7838) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd0000,fffffd80738ae438,ffff8000299c7a08,fffffd806d8047a8,fffffd807d8ad478,ffff8000299c7958) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff8000216b7b58,3,20000180,7,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff8000299c7ba0) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x220dd97ca70, count: -7