panic: ufs_rename: lost dir entry Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *227212 41823 0 0x1000 0x4080000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827398d4) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff800027fcc488) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd1360,fffffd805b794488,ffff800027fcc658,fffffd805b794050,fffffd80686289a0,ffff800027fcc5a8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff8000ffff0848,3,20000180,9,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff800027fcc7f0) at syscall+0x4e6 sys/arch/amd64/amd64/trap.c:626 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfee2fcb5ad0, 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(ffffffff827398d4) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff800027fcc488) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd1360,fffffd805b794488,ffff800027fcc658,fffffd805b794050,fffffd80686289a0,ffff800027fcc5a8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff8000ffff0848,3,20000180,9,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff800027fcc7f0) at syscall+0x4e6 sys/arch/amd64/amd64/trap.c:626 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfee2fcb5ad0, count: -7 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800027fcc220 rbx 0xfffffd805b794998 rdx 0 rcx 0 rax 0xffff8000ffff0848 r8 0x101010101010101 r9 0x8080808080808080 r10 0x26b434d3ff9aaaea r11 0xfccca61daf96c8d r12 0 r13 0xfffffd806ede4690 r14 0 r15 0x1 rip 0xffffffff814a7c88 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800027fcc210 ss 0 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=227212 stat=onproc flags process=1000 proc=4080000 pri=17, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff1b50,0xffff80002170a870 process=0xffff8000216f83f0 user=0xffff800027fc7000, vmspace=0xfffffd807380d010 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *41823 227212 7910 0 7 0x4081000 syz-executor.0 41823 73859 7910 0 3 0x4003000 suspend syz-executor.0 93433 134915 78837 0 2 0 syz-executor.5 93433 425195 78837 0 2 0x4000000 syz-executor.5 93490 499757 33772 0 3 0x82 piperd syz-executor.3 61882 294216 33772 0 2 0x2 syz-executor.1 7910 447580 33772 0 3 0x82 nanoslp syz-executor.0 13044 347636 33772 0 2 0x2 syz-executor.4 16138 15028 0 0 3 0x14200 bored sosplice 17753 52026 1 0 3 0x100083 ttyin getty 17889 476566 33772 0 3 0x82 piperd syz-executor.2 80391 356082 33772 0 3 0x82 piperd syz-executor.6 78837 397095 33772 0 3 0x82 nanoslp syz-executor.5 33772 76703 59303 0 3 0x82 kqread syz-fuzzer 33772 515716 59303 0 3 0x4000082 nanoslp syz-fuzzer 33772 174674 59303 0 3 0x4000082 wait syz-fuzzer 33772 35157 59303 0 3 0x4000082 thrsleep syz-fuzzer 33772 278775 59303 0 3 0x4000082 wait syz-fuzzer 33772 339607 59303 0 3 0x4000082 thrsleep syz-fuzzer 33772 510443 59303 0 3 0x4000082 wait syz-fuzzer 33772 425652 59303 0 3 0x4000082 thrsleep syz-fuzzer 33772 248608 59303 0 3 0x4000082 wait syz-fuzzer 33772 68870 59303 0 3 0x4000082 wait syz-fuzzer 33772 381606 59303 0 3 0x4000082 wait syz-fuzzer 33772 323154 59303 0 3 0x4000082 thrsleep syz-fuzzer 33772 331962 59303 0 3 0x4000082 wait syz-fuzzer 33772 434394 59303 0 3 0x4000082 thrsleep syz-fuzzer 33772 180510 59303 0 3 0x4000082 thrsleep syz-fuzzer 59303 374699 62391 0 3 0x10008a sigsusp ksh 62391 356879 75012 0 3 0x9a kqread sshd 75012 451526 1 0 3 0x88 kqread sshd 110 456164 19322 73 3 0x1100090 kqread syslogd 19322 153232 1 0 3 0x100082 netio syslogd 38503 113710 1 0 3 0x100080 kqread resolvd 51124 199645 72062 77 3 0x100092 kqread dhcpleased 21677 288974 72062 77 3 0x100092 kqread dhcpleased 72062 347005 1 0 3 0x80 kqread dhcpleased 64726 76228 0 0 3 0x14200 bored smr 16507 153817 0 0 2 0x14200 zerothread 54595 420647 0 0 3 0x14200 aiodoned aiodoned 64537 163977 0 0 3 0x14200 syncer update 3813 2406 0 0 3 0x14200 cleaner cleaner 77854 89466 0 0 3 0x14200 reaper reaper 74815 122092 0 0 3 0x14200 pgdaemon pagedaemon 84876 103927 0 0 3 0x14200 bored viomb 91448 46259 0 0 3 0x40014200 acpi0 acpi0 86074 445325 0 0 3 0x14200 bored softnet 85878 391220 0 0 3 0x14200 bored softnet 49033 290373 0 0 3 0x14200 bored softnet 33620 379224 0 0 3 0x14200 bored softnet 22906 468512 0 0 3 0x14200 bored systqmp 92565 397983 0 0 3 0x14200 bored systq 7182 499137 0 0 3 0x40014200 bored softclock 47893 439025 0 0 3 0x40014200 idle0 1 146351 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 10204 6418K 6856K 78643K 14207 0 pcb 13 15K 17K 78643K 446 0 rtable 153 6K 8K 78643K 796 0 ifaddr 59 18K 21K 78643K 306 0 counters 25 17K 17K 78643K 130 0 ioctlops 0 0K 2K 78643K 234 0 iov 0 0K 12K 78643K 124 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1401 88K 88K 78643K 2625 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 34 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 1K 78643K 222 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 11 37K 69K 78643K 1661 0 sigio 0 0K 0K 78643K 78 0 proc 58 59K 75K 78643K 850 0 subproc 91 5K 6K 78643K 260 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 203 0 in_multi 59 3K 7K 78643K 254 0 ether_multi 1 0K 0K 78643K 10 0 mrt 0 0K 0K 78643K 18 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 169 758K 758K 78643K 169 0 exec 0 0K 1K 78643K 777 0 pfkey data 0 0K 1K 78643K 152 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 284 80K 99K 78643K 12156 0 UVM aobj 112 3K 3K 78643K 115 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 20 0 NDP 9 0K 1K 78643K 100 0 temp 112 5769K 6794K 78643K 40115 0 kqueue 13 20K 28K 78643K 327 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 120 362 0 359 7 6 1 3 0 8 0 rtentry 112 251 0 185 4 0 4 4 0 8 0 unpcb 144 1388 0 1375 14 11 3 8 0 8 2 syncache 296 31 0 31 4 3 1 1 0 8 1 tcpqe 32 108 0 108 3 3 0 1 0 8 0 tcpcb 776 802 0 796 26 20 6 14 0 8 5 arp 88 40 0 30 1 0 1 1 0 8 0 inpcb 336 2355 0 2346 34 27 7 17 0 8 6 nd6 48 59 0 47 1 0 1 1 0 8 0 pkpcb 40 1262 0 1260 1 0 1 1 0 8 0 kcovpl 48 20 0 13 1 0 1 1 0 8 0 mppekey 1024 5 0 5 1 1 0 1 0 8 0 ppxss 1160 65 0 65 4 3 1 1 0 8 1 pppxif 1360 45 0 45 2 2 0 1 0 8 0 pfstscr 40 38 0 35 1 0 1 1 0 8 0 pfanchor 1280 512 3 0 43 0 43 43 0 8 0 pfstitem 24 6 0 0 1 0 1 1 0 8 0 pfstkey 128 76 0 74 1 0 1 1 0 8 0 pfstate 352 38 0 35 1 0 1 1 0 8 0 rttmr 136 3 0 3 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1049 0 766 30 9 21 30 0 8 2 art_table 32 1050 0 766 4 0 4 4 0 8 0 art_node 16 250 0 190 1 0 1 1 0 8 0 sysvmsgpl 40 46 0 37 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 220 0 210 1 0 1 1 0 8 0 shmpl 112 112 0 3 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3727 0 2287 91 0 91 91 0 8 0 ffsino 240 3727 0 2287 86 0 86 86 0 8 0 nchpl 144 6535 0 4926 63 0 63 63 0 8 0 uvmvnodes 80 4882 0 0 100 0 100 100 0 8 0 vnodes 216 4882 0 0 272 0 272 272 0 8 0 namei 1024 28080 0 28077 5 3 2 2 0 8 1 vmpool 664 3 0 3 1 1 0 1 0 8 0 kstatmem 264 124 0 106 2 0 2 2 0 8 0 scxspl 216 19097 0 19097 11 10 1 8 0 8 1 plimitpl 152 398 0 384 1 0 1 1 0 8 0 sigapl 424 1952 0 1913 8 1 7 8 0 8 0 futexpl 64 17850 0 17850 1 0 1 1 0 8 1 knotepl 120 23949 0 23874 10 5 5 8 0 8 0 kqueuepl 184 549 0 538 4 3 1 4 0 8 0 pipepl 288 557 0 532 9 4 5 5 0 8 2 fdescpl 432 1915 0 1893 4 0 4 4 0 8 0 filepl 120 18238 0 18009 27 15 12 18 0 8 2 lockfpl 104 413 0 411 2 1 1 2 0 8 0 lockfspl 48 105 0 103 1 0 1 1 0 8 0 sessionpl 144 36 0 21 1 0 1 1 0 8 0 pgrppl 48 104 0 89 1 0 1 1 0 8 0 ucredpl 104 1696 0 1685 1 0 1 1 0 8 0 zombiepl 144 1914 0 1913 1 0 1 1 0 8 0 processpl 1008 1952 0 1913 10 3 7 9 0 8 0 procpl 696 4453 0 4397 11 4 7 9 0 8 0 sosppl 168 15 0 15 2 1 1 1 0 8 1 sockpl 456 5377 0 5350 115 104 11 29 0 8 7 mcl64k 65536 71 0 71 3 2 1 1 0 8 1 mcl16k 16384 54 0 54 3 3 0 1 0 8 0 mcl12k 12288 73 0 73 1 0 1 1 0 8 1 mcl9k 9216 18 0 18 3 2 1 1 0 8 1 mcl8k 8192 152 0 152 3 2 1 1 0 8 1 mcl4k 4096 186 0 186 4 3 1 1 0 8 1 mcl2k2 2112 12 0 12 5 4 1 1 0 8 1 mcl2k 2048 80029 0 79894 45 27 18 31 0 8 0 mtagpl 96 221 0 130 6 2 4 5 0 8 0 mbufpl 256 148955 0 148671 183 152 31 89 0 8 1 bufpl 288 6569 0 175 457 0 457 457 0 8 0 anonpl 24 450258 0 434691 149 37 112 134 0 188 0 amapchunkpl 152 35842 0 35171 52 22 30 38 0 158 0 amappl16 200 7032 0 6473 58 25 33 43 0 8 0 amappl15 192 34 0 33 1 0 1 1 0 8 0 amappl14 184 188 0 176 2 0 2 2 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 543 0 540 1 0 1 1 0 8 0 amappl11 160 49 0 39 1 0 1 1 0 8 0 amappl10 152 48 0 39 1 0 1 1 0 8 0 amappl9 144 961 0 960 3 2 1 1 0 8 0 amappl8 136 173 0 117 2 0 2 2 0 8 0 amappl7 128 158 0 135 2 0 2 2 0 8 0 amappl6 120 197 0 184 1 0 1 1 0 8 0 amappl5 112 197 0 190 1 0 1 1 0 8 0 amappl4 104 569 0 545 1 0 1 1 0 8 0 amappl3 96 4961 0 4917 2 0 2 2 0 8 0 amappl2 88 2443 0 2376 3 1 2 3 0 8 0 amappl1 80 45260 0 44617 24 7 17 22 0 8 0 amappl 88 11525 0 11367 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 72 114 0 3 3 0 3 3 0 8 0 uaddrrnd 24 1918 0 1896 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1918 0 1896 1 0 1 1 0 8 0 vmmpekpl 168 20205 0 20155 4 0 4 4 0 8 0 vmmpepl 168 190926 0 188580 161 29 132 147 0 357 12 vmsppl 272 1917 0 1896 3 1 2 2 0 8 0 rwobjpl 24 56700 0 50121 41 0 41 41 0 8 1 pdppl 4096 3842 0 3792 176 116 60 66 0 8 10 pvpl 32 905092 0 884696 273 72 201 255 0 265 11 pmappl 216 1917 0 1896 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1142 0 354 23 0 23 23 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(ffffffff827398d4) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff800027fcc488) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd1360,fffffd805b794488,ffff800027fcc658,fffffd805b794050,fffffd80686289a0,ffff800027fcc5a8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff8000ffff0848,3,20000180,9,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff800027fcc7f0) at syscall+0x4e6 sys/arch/amd64/amd64/trap.c:626 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfee2fcb5ad0, 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(ffffffff827398d4) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff800027fcc488) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd1360,fffffd805b794488,ffff800027fcc658,fffffd805b794050,fffffd80686289a0,ffff800027fcc5a8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff8000ffff0848,3,20000180,9,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff800027fcc7f0) at syscall+0x4e6 sys/arch/amd64/amd64/trap.c:626 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfee2fcb5ad0, count: -7