panic: ufs_rename: lost dir entry Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 67941 76714 0 0 0x4000000 0 syz-executor.7 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82592550) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e9ab0e8) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd1438,fffffd8074d572e8,ffff80002e9ab2b8,fffffd8074d57c30,fffffd8074d57138,ffff80002e9ab208) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff800024bec550,5,20000180,7,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e9ab450) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2a1eb842330, 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(ffffffff82592550) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e9ab0e8) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd1438,fffffd8074d572e8,ffff80002e9ab2b8,fffffd8074d57c30,fffffd8074d57138,ffff80002e9ab208) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff800024bec550,5,20000180,7,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e9ab450) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2a1eb842330, count: -7 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002e9aae80 rbx 0xfffffd80775d0a78 rdx 0 rcx 0 rax 0xffff800024bec550 r8 0x101010101010101 r9 0x8080808080808080 r10 0x6331514a84f32e12 r11 0x2472db75956dfd45 r12 0 r13 0xfffffd80738dcf10 r14 0 r15 0x1 rip 0xffffffff818efcf8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e9aae70 ss 0 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.7) pid=67941 stat=onproc flags process=0 proc=4000000 pri=17, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff800021703a40,0xffff800024c21cf0 process=0xffff800024c08fc0 user=0xffff80002e9a6000, vmspace=0xfffffd8072560ef0 estcpu=33, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 76714 388620 13095 0 3 0x80 nanoslp syz-executor.7 76714 272906 13095 0 2 0x4000000 syz-executor.7 *76714 67941 13095 0 7 0x4000000 syz-executor.7 76714 26207 13095 0 3 0x4000080 fsleep syz-executor.7 26001 445827 90469 0 2 0 syz-executor.4 26001 142773 90469 0 3 0x4000080 fsleep syz-executor.4 51520 486040 98269 0 2 0 syz-executor.1 51520 85976 98269 0 2 0x4000000 syz-executor.1 51520 446104 98269 0 2 0x4000000 syz-executor.1 51520 444791 98269 0 3 0x4000000 inode syz-executor.1 73883 300042 33488 0 3 0x80 nanoslp syz-executor.6 73883 494730 33488 0 3 0x4000080 fsleep syz-executor.6 73883 1024 33488 0 3 0x4000080 fsleep syz-executor.6 69602 219617 0 0 3 0x14280 nfsidl nfsio 37943 188612 0 0 3 0x14280 nfsidl nfsio 95106 461734 0 0 3 0x14280 nfsidl nfsio 26741 104564 0 0 3 0x14280 nfsidl nfsio 5685 211180 0 0 3 0x14280 nfsidl nfsio 88670 391713 0 0 3 0x14280 nfsidl nfsio 57260 48085 0 0 3 0x14280 nfsidl nfsio 31923 443068 0 0 3 0x14280 nfsidl nfsio 56693 272116 0 0 3 0x14280 nfsidl nfsio 24199 492428 0 0 3 0x14280 nfsidl nfsio 91390 330911 0 0 3 0x14280 nfsidl nfsio 48866 366784 0 0 3 0x14280 nfsidl nfsio 65655 469538 0 0 3 0x14280 nfsidl nfsio 27702 68203 0 0 3 0x14280 nfsidl nfsio 14338 213686 0 0 3 0x14280 nfsidl nfsio 50748 39177 0 0 3 0x14280 nfsidl nfsio 55892 455841 0 0 3 0x14280 nfsidl nfsio 76494 365216 0 0 3 0x14280 nfsidl nfsio 41276 94700 0 0 3 0x14280 nfsidl nfsio 48815 268012 0 0 3 0x14280 nfsidl nfsio 49525 28310 30306 0 3 0x82 nanoslp syz-executor.3 20414 26456 30306 0 3 0x82 nanoslp syz-executor.2 33488 311781 30306 0 3 0x82 nanoslp syz-executor.6 95589 451164 0 0 3 0x14200 bored sosplice 92683 326448 30306 0 3 0x82 nanoslp syz-executor.5 90469 491303 30306 0 3 0x82 nanoslp syz-executor.4 13095 73094 30306 0 3 0x82 nanoslp syz-executor.7 98269 16204 30306 0 3 0x82 nanoslp syz-executor.1 55762 499289 30306 0 2 0x2 syz-executor.0 30306 353103 89373 0 3 0x82 thrsleep syz-fuzzer 30306 150147 89373 0 3 0x4000082 nanoslp syz-fuzzer 30306 355144 89373 0 3 0x4000082 wait syz-fuzzer 30306 390406 89373 0 3 0x4000082 wait syz-fuzzer 30306 142009 89373 0 3 0x4000082 wait syz-fuzzer 30306 251796 89373 0 3 0x4000082 thrsleep syz-fuzzer 30306 366233 89373 0 3 0x4000082 wait syz-fuzzer 30306 291232 89373 0 3 0x4000082 wait syz-fuzzer 30306 119943 89373 0 3 0x4000082 thrsleep syz-fuzzer 30306 204340 89373 0 3 0x4000082 thrsleep syz-fuzzer 30306 81147 89373 0 3 0x4000082 wait syz-fuzzer 30306 398408 89373 0 3 0x4000082 wait syz-fuzzer 30306 28988 89373 0 3 0x4000082 kqread syz-fuzzer 30306 398543 89373 0 3 0x4000082 wait syz-fuzzer 89373 75572 88279 0 3 0x10008a sigsusp ksh 88279 322789 90508 0 3 0x9a kqread sshd 34856 174987 1 0 3 0x100083 ttyin getty 90508 433040 1 0 3 0x88 kqread sshd 21955 390713 15922 73 3 0x1100090 kqread syslogd 15922 187415 1 0 3 0x100082 netio syslogd 76843 147165 1 0 3 0x100080 kqread resolvd 66039 435444 31997 77 3 0x100092 kqread dhcpleased 66542 375766 31997 77 3 0x100092 kqread dhcpleased 31997 361810 1 0 3 0x80 kqread dhcpleased 89312 444071 0 0 3 0x14200 bored smr 34213 261913 0 0 2 0x14200 zerothread 45669 230349 0 0 3 0x14200 aiodoned aiodoned 80096 506833 0 0 3 0x14200 syncer update 88767 329526 0 0 3 0x14200 cleaner cleaner 80727 432989 0 0 3 0x14200 reaper reaper 14245 8680 0 0 3 0x14200 pgdaemon pagedaemon 61715 501187 0 0 3 0x14200 bored viomb 13970 328756 0 0 3 0x40014200 acpi0 acpi0 90465 261674 0 0 3 0x14200 bored softnet 98321 64711 0 0 3 0x14200 bored softnet 57940 277674 0 0 3 0x14200 bored softnet 68550 516977 0 0 3 0x14200 bored softnet 61571 6343 0 0 3 0x14200 bored systqmp 1579 67049 0 0 3 0x14200 bored systq 23385 119935 0 0 3 0x40014200 bored softclock 58155 178065 0 0 3 0x40014200 idle0 1 133305 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 10187 6405K 6548K 78643K 11915 0 pcb 13 14K 16K 78643K 237 0 rtable 211 15K 15K 78643K 509 0 ifaddr 82 18K 18K 78643K 135 0 counters 29 17K 17K 78643K 78 0 ioctlops 0 0K 2K 78643K 356 0 iov 0 0K 18K 78643K 93 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1437 90K 90K 78643K 2394 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 7 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 25 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 14 49K 69K 78643K 793 0 sigio 0 0K 0K 78643K 137 0 proc 57 59K 83K 78643K 568 0 subproc 104 6K 6K 78643K 143 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 102 0 in_multi 96 6K 6K 78643K 148 0 ether_multi 1 0K 0K 78643K 7 0 mrt 1 0K 0K 78643K 18 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 67 307K 307K 78643K 67 0 exec 0 0K 1K 78643K 613 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 281 82K 83K 78643K 6774 0 UVM aobj 47 2K 2K 78643K 47 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 22 0 NDP 13 0K 1K 78643K 44 0 temp 133 4686K 4762K 78643K 24387 0 kqueue 14 22K 32K 78643K 273 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 57 0 54 1 0 1 1 0 8 0 rtentry 112 160 0 66 4 0 4 4 0 8 0 unpcb 144 620 0 605 8 2 6 6 0 8 5 syncache 296 11 0 11 3 2 1 1 0 8 1 tcpqe 32 215 0 215 4 3 1 1 0 8 1 tcpcb 776 277 0 270 12 7 5 8 0 8 3 arp 88 24 0 8 1 0 1 1 0 8 0 inpcb 336 992 0 982 22 12 10 12 0 8 8 nd6 48 33 0 12 1 0 1 1 0 8 0 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1160 41 0 40 1 0 1 1 0 8 0 pppxif 1352 41 0 40 1 0 1 1 0 8 0 pfstscr 40 134 0 128 1 0 1 1 0 8 0 pfstitem 24 6 0 0 1 0 1 1 0 8 0 pfstkey 128 134 0 132 1 0 1 1 0 8 0 pfstate 352 67 0 64 1 0 1 1 0 8 0 rttmr 136 6 0 6 2 1 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 685 0 253 33 6 27 30 0 8 0 art_table 32 686 0 253 4 0 4 4 0 8 0 art_node 16 159 0 76 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 2 1 0 1 1 0 8 0 semupl 112 5 0 5 2 1 1 1 0 8 1 semapl 112 23 0 13 1 0 1 1 0 8 0 shmpl 112 44 0 0 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3082 0 1639 91 0 91 91 0 8 0 ffsino 240 3082 0 1639 85 0 85 85 0 8 0 nchpl 144 4881 0 3262 63 0 63 63 0 8 0 uvmvnodes 80 3737 0 0 77 0 77 77 0 8 0 vnodes 216 3737 0 0 208 0 208 208 0 8 0 namei 1024 21372 0 21367 5 3 2 2 0 8 1 kstatmem 264 44 0 18 2 0 2 2 0 8 0 scxspl 216 13499 0 13499 9 8 1 8 0 8 1 plimitpl 152 213 0 198 1 0 1 1 0 8 0 sigapl 424 1100 0 1035 8 0 8 8 0 8 0 futexpl 64 8976 0 8972 1 0 1 1 0 8 0 knotepl 120 14517 0 14435 14 7 7 10 0 8 4 kqueuepl 184 441 0 430 4 3 1 4 0 8 0 pipepl 288 333 0 305 9 6 3 7 0 8 0 fdescpl 432 1063 0 1038 4 0 4 4 0 8 0 filepl 120 10850 0 10602 23 7 16 16 0 8 8 lockfpl 104 124 0 122 1 0 1 1 0 8 0 lockfspl 48 61 0 59 1 0 1 1 0 8 0 sessionpl 144 26 0 10 1 0 1 1 0 8 0 pgrppl 48 107 0 91 1 0 1 1 0 8 0 ucredpl 104 1970 0 1960 1 0 1 1 0 8 0 zombiepl 144 1038 0 1035 1 0 1 1 0 8 0 processpl 1008 1100 0 1035 10 1 9 9 0 8 0 procpl 672 2464 0 2377 10 1 9 9 0 8 0 sosppl 168 13 0 13 2 1 1 1 0 8 1 sockpl 456 1669 0 1641 39 23 16 20 0 8 12 mcl64k 65536 24 0 24 3 2 1 1 0 8 1 mcl16k 16384 10 0 10 2 1 1 1 0 8 1 mcl12k 12288 48 0 48 1 0 1 1 0 8 1 mcl9k 9216 15 0 15 1 0 1 1 0 8 1 mcl8k 8192 58 0 58 2 1 1 1 0 8 1 mcl4k 4096 116 0 116 1 0 1 1 0 8 1 mcl2k2 2112 11 0 11 3 2 1 1 0 8 1 mcl2k 2048 74179 0 74107 35 24 11 30 0 8 0 mtagpl 96 16 0 8 2 1 1 1 0 8 0 mbufpl 256 122638 0 122376 51 32 19 41 0 8 0 bufpl 288 5708 0 140 398 0 398 398 0 8 0 anonpl 24 249326 0 233290 112 1 111 111 0 188 0 amapchunkpl 152 18771 0 18093 30 1 29 29 0 158 1 amappl16 200 3450 0 2848 34 2 32 33 0 8 0 amappl15 192 8 0 7 1 0 1 1 0 8 0 amappl14 184 154 0 141 2 1 1 2 0 8 0 amappl13 176 7 0 7 1 1 0 1 0 8 0 amappl12 168 443 0 438 1 0 1 1 0 8 0 amappl11 160 50 0 39 1 0 1 1 0 8 0 amappl10 152 35 0 25 1 0 1 1 0 8 0 amappl9 144 947 0 947 2 2 0 1 0 8 0 amappl8 136 151 0 101 2 0 2 2 0 8 0 amappl7 128 136 0 118 2 0 2 2 0 8 0 amappl6 120 157 0 147 1 0 1 1 0 8 0 amappl5 112 137 0 131 1 0 1 1 0 8 0 amappl4 104 506 0 481 2 1 1 2 0 8 0 amappl3 96 2582 0 2530 2 0 2 2 0 8 0 amappl2 88 1437 0 1367 3 1 2 3 0 8 0 amappl1 80 26297 0 25607 23 6 17 22 0 8 1 amappl 88 6265 0 6096 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 46 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1063 0 1038 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1063 0 1038 1 0 1 1 0 8 0 vmmpekpl 168 14132 0 14078 3 0 3 3 0 8 0 vmmpepl 168 107694 0 105111 153 18 135 138 0 357 10 vmsppl 272 1062 0 1038 3 1 2 2 0 8 0 rwobjpl 24 33669 0 28219 34 0 34 34 0 8 0 pdppl 4096 2132 0 2076 144 80 64 66 0 8 8 pvpl 32 548558 0 527323 269 43 226 269 0 265 39 pmappl 216 1062 0 1038 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 891 0 170 21 0 21 21 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(ffffffff82592550) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e9ab0e8) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd1438,fffffd8074d572e8,ffff80002e9ab2b8,fffffd8074d57c30,fffffd8074d57138,ffff80002e9ab208) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff800024bec550,5,20000180,7,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e9ab450) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2a1eb842330, 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(ffffffff82592550) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e9ab0e8) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd1438,fffffd8074d572e8,ffff80002e9ab2b8,fffffd8074d57c30,fffffd8074d57138,ffff80002e9ab208) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff800024bec550,5,20000180,7,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e9ab450) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2a1eb842330, count: -7