panic: ufs_rename: lost dir entry Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *321537 30069 60928 0x1010 0x4080000 0 syz-executor.5 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8278639c) at panic+0x165 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e9201b8) at ufs_rename+0x15b1 sys/ufs/ufs/ufs_vnops.c:908 VOP_RENAME(fffffd807e8f9cf8,fffffd807e8f97e8,ffff80002e920388,fffffd807e8f9cf8,0,ffff80002e9202d8) at VOP_RENAME+0xf4 sys/kern/vfs_vops.c:370 dorenameat(ffff8000fffea5a0,ffffff9c,200005c0,ffffff9c,200006c0) at dorenameat+0x2a0 sys/kern/vfs_syscalls.c:2994 syscall(ffff80002e920520) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf32379146f0, 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+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8278639c) at panic+0x165 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e9201b8) at ufs_rename+0x15b1 sys/ufs/ufs/ufs_vnops.c:908 VOP_RENAME(fffffd807e8f9cf8,fffffd807e8f97e8,ffff80002e920388,fffffd807e8f9cf8,0,ffff80002e9202d8) at VOP_RENAME+0xf4 sys/kern/vfs_vops.c:370 dorenameat(ffff8000fffea5a0,ffffff9c,200005c0,ffffff9c,200006c0) at dorenameat+0x2a0 sys/kern/vfs_syscalls.c:2994 syscall(ffff80002e920520) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf32379146f0, count: -7 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002e91ff50 rbx 0xfffffd8061dbcd00 rdx 0 rcx 0 rax 0xffff8000fffea5a0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x30c51a88dc00ac50 r11 0xa59414ce8532bb1c r12 0 r13 0xfffffd806ed66d30 r14 0 r15 0x1 rip 0xffffffff8127c13c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002e91ff40 ss 0 db_enter+0x1c: addq $0x8,%rsp ddb> show proc PROC (syz-executor.5) pid=321537 stat=onproc flags process=1010 proc=4080000 pri=17, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff8000287d5618,0xffff8000fffed5f8 process=0xffff800023178010 user=0xffff80002e91b000, vmspace=0xfffffd8071679178 estcpu=32, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 47154 230124 80647 0 2 0 syz-executor.3 47154 51948 80647 0 2 0x4000000 syz-executor.3 82144 472963 16363 0 2 0 syz-executor.0 82144 431059 16363 0 3 0x4000080 kqpoll syz-executor.0 82144 261299 16363 0 3 0x4000080 fsleep syz-executor.0 8400 239974 21183 0 3 0x80 nanoslp syz-executor.6 8400 425257 21183 0 3 0x4000080 msgwait syz-executor.6 8400 321475 21183 0 3 0x4000080 msgwait syz-executor.6 8400 115493 21183 0 3 0x4000080 fsleep syz-executor.6 56182 340174 79087 0 3 0x80 nanoslp syz-executor.1 56182 233148 79087 0 2 0x4000000 syz-executor.1 56182 300962 79087 0 3 0x4000080 fsleep syz-executor.1 30069 362615 79679 60928 2 0x4081010 syz-executor.5 *30069 321537 79679 60928 7 0x4081010 syz-executor.5 30069 342449 79679 60928 3 0x4003010 suspend syz-executor.5 49868 312018 74191 0 2 0 syz-executor.2 49868 14807 74191 0 2 0x4000000 syz-executor.2 49868 90847 74191 0 3 0x4000000 inode syz-executor.2 49868 412957 74191 0 3 0x4000000 inode syz-executor.2 31518 1897 0 0 3 0x14280 nfsidl nfsio 11909 217731 0 0 3 0x14280 nfsidl nfsio 36323 153091 0 0 3 0x14280 nfsidl nfsio 28557 232768 0 0 3 0x14280 nfsidl nfsio 13614 275600 0 0 3 0x14280 nfsidl nfsio 40529 231888 0 0 3 0x14280 nfsidl nfsio 41236 455460 0 0 3 0x14280 nfsidl nfsio 39030 124085 0 0 3 0x14280 nfsidl nfsio 1545 441231 0 0 3 0x14280 nfsidl nfsio 31160 160925 0 0 3 0x14280 nfsidl nfsio 45815 364820 0 0 3 0x14280 nfsidl nfsio 77721 452844 0 0 3 0x14280 nfsidl nfsio 41770 368883 0 0 3 0x14280 nfsidl nfsio 62949 94699 0 0 3 0x14280 nfsidl nfsio 38800 279909 0 0 3 0x14280 nfsidl nfsio 46496 392112 0 0 3 0x14280 nfsidl nfsio 28430 202092 0 0 3 0x14280 nfsidl nfsio 50078 500055 0 0 3 0x14280 nfsidl nfsio 51977 428837 0 0 3 0x14280 nfsidl nfsio 74103 186653 0 0 3 0x14280 nfsidl nfsio 29149 81140 0 0 3 0x14200 bored sosplice 13868 249880 26409 0 2 0x2 syz-executor.7 21183 412142 26409 0 3 0x82 nanoslp syz-executor.6 39849 376473 26409 0 2 0x2 syz-executor.4 79679 483035 26409 0 2 0x482 syz-executor.5 80647 213480 26409 0 3 0x82 nanoslp syz-executor.3 79087 7468 26409 0 2 0x482 syz-executor.1 16363 524104 26409 0 2 0x482 syz-executor.0 74191 500831 26409 0 2 0x482 syz-executor.2 26409 179857 93409 0 3 0x2000082 thrsleep syz-fuzzer 26409 326782 93409 0 2 0x6000482 syz-fuzzer 26409 344011 93409 0 3 0x6000082 wait syz-fuzzer 26409 512588 93409 0 3 0x6000082 wait syz-fuzzer 26409 356315 93409 0 3 0x6000082 wait syz-fuzzer 26409 207817 93409 0 3 0x6000082 wait syz-fuzzer 26409 397655 93409 0 3 0x6000082 thrsleep syz-fuzzer 26409 432033 93409 0 3 0x6000082 wait syz-fuzzer 26409 508390 93409 0 3 0x6000082 wait syz-fuzzer 26409 106973 93409 0 3 0x6000082 wait syz-fuzzer 26409 278744 93409 0 3 0x6000082 thrsleep syz-fuzzer 26409 197183 93409 0 3 0x6000082 wait syz-fuzzer 26409 459599 93409 0 3 0x6000082 thrsleep syz-fuzzer 26409 65583 93409 0 2 0x6000002 syz-fuzzer 93409 496195 46870 0 3 0x10008a sigsusp ksh 46870 322517 82207 0 2 0x12 sshd 3557 478901 1 0 3 0x100083 ttyin getty 82207 245783 1 0 3 0x88 kqread sshd 3215 15886 38618 73 3 0x1100090 kqread syslogd 38618 195339 1 0 3 0x100082 netio syslogd 70826 26168 1 0 3 0x100080 kqread resolvd 97107 158878 81009 77 3 0x100092 kqread dhcpleased 96445 163012 81009 77 3 0x100092 kqread dhcpleased 81009 325168 1 0 3 0x80 kqread dhcpleased 4298 382075 0 0 3 0x14200 bored smr 79561 188549 0 0 2 0x14200 zerothread 23263 248264 0 0 3 0x14200 aiodoned aiodoned 51897 166449 0 0 3 0x14200 syncer update 30787 475319 0 0 3 0x14200 cleaner cleaner 65592 150358 0 0 3 0x14200 reaper reaper 98938 380079 0 0 3 0x14200 pgdaemon pagedaemon 54957 370044 0 0 3 0x14200 bored viomb 5954 225132 0 0 3 0x40014200 acpi0 acpi0 51739 292722 0 0 3 0x14200 bored softnet3 77458 500083 0 0 3 0x14200 bored softnet2 99846 521268 0 0 3 0x14200 bored softnet1 31738 29409 0 0 3 0x14200 bored softnet0 2271 471009 0 0 3 0x14200 bored systqmp 90432 168968 0 0 3 0x14200 bored systq 85747 144804 0 0 3 0x40014200 bored softclock 65697 505390 0 0 3 0x40014200 idle0 1 115907 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 10173 6468K 6977K 78643K 12315 0 pcb 13 10K 12K 78643K 149 0 rtable 239 7K 7K 78643K 374 0 pf 29 8K 9K 78643K 68 0 ifaddr 43 11K 11K 78643K 61 0 ifgroup 50 2K 2K 78643K 111 0 counters 28 17K 17K 78643K 42 0 ioctlops 0 0K 2K 78643K 41 0 iov 0 0K 16K 78643K 57 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1381 86K 87K 78643K 1707 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 11 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 188 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 16 57K 69K 78643K 749 0 sigio 0 0K 0K 78643K 4 0 proc 58 59K 75K 78643K 491 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 71 0 in_multi 99 7K 7K 78643K 105 0 ether_multi 1 0K 0K 78643K 1 0 mrt 1 0K 0K 78643K 1 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 384 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 349 86K 90K 78643K 9230 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 12 0 NDP 11 0K 2K 78643K 41 0 temp 47 5857K 5921K 78643K 5786 0 kqueue 13 20K 29K 78643K 127 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 112 113 0 2 4 0 4 4 0 8 0 unpcb 144 772 0 759 14 8 6 9 0 8 5 syncache 296 7 0 7 2 2 0 1 0 8 0 tcpqe 32 443 0 443 4 4 0 3 0 8 0 tcpcb 808 173 0 165 13 8 5 8 0 8 4 arp 88 18 0 0 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 4 0 3 1 0 1 1 0 8 0 inpcb 336 492 0 481 14 10 4 7 0 8 2 nd6 104 26 0 1 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1160 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 256 456 0 2 29 0 29 29 0 8 0 art_table 32 457 0 2 4 0 4 4 0 8 0 art_node 16 112 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 3 1 0 1 1 0 8 0 semapl 112 186 0 176 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 2436 0 994 91 0 91 91 0 8 0 ffsino 240 2436 0 994 85 0 85 85 0 8 0 nchpl 144 3497 0 1817 63 0 63 63 0 8 0 uvmvnodes 80 2777 0 0 57 0 57 57 0 8 0 vnodes 216 2777 0 0 155 0 155 155 0 8 0 namei 1024 12129 0 12125 4 2 2 3 0 8 1 kstatmem 264 50 0 28 2 0 2 2 0 8 0 scxspl 216 11130 0 11130 12 11 1 8 1 8 1 plimitpl 152 131 0 116 1 0 1 1 0 8 0 sigapl 424 1106 0 1042 8 0 8 8 0 8 0 futexpl 64 7253 0 7250 1 0 1 1 0 8 0 knotepl 120 10307 0 10227 3 0 3 3 0 8 0 kqueuepl 184 823 0 811 12 9 3 7 0 8 2 pipepl 288 280 0 251 10 6 4 7 0 8 1 fdescpl 432 1029 0 1002 4 0 4 4 0 8 0 filepl 120 7200 0 6957 23 9 14 16 0 8 6 lockfpl 104 251 0 249 1 0 1 1 0 8 0 lockfspl 48 89 0 87 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 25 0 9 1 0 1 1 0 8 0 ucredpl 104 765 0 754 1 0 1 1 0 8 0 zombiepl 144 1043 0 1042 1 0 1 1 0 8 0 processpl 1008 1106 0 1042 10 1 9 9 0 8 0 procpl 696 2170 0 2079 12 3 9 10 0 8 0 sosppl 168 6 0 4 1 0 1 1 0 8 0 sockpl 456 1321 0 1294 70 58 12 33 0 8 8 mcl64k 65536 21 0 21 3 2 1 1 0 8 1 mcl16k 16384 4 0 4 2 2 0 1 0 8 0 mcl12k 12288 11 0 11 3 2 1 1 0 8 1 mcl9k 9216 20 0 20 2 1 1 1 0 8 1 mcl8k 8192 56 0 56 3 2 1 1 0 8 1 mcl4k 4096 130 0 130 2 1 1 2 0 8 1 mcl2k2 2112 1 0 1 1 1 0 1 0 8 0 mcl2k 2048 65191 0 65137 74 66 8 45 0 8 0 mtagpl 96 134 0 4 5 1 4 4 0 8 0 mbufpl 256 106949 0 106643 49 28 21 25 0 8 0 bufpl 288 4928 0 152 342 0 342 342 0 8 0 anonpl 24 292686 0 279453 96 6 90 91 0 188 9 amapchunkpl 152 30676 0 29785 41 6 35 38 0 158 0 amappl16 200 8262 0 7893 27 2 25 26 0 8 5 amappl15 192 20 0 20 1 1 0 1 0 8 0 amappl14 184 156 0 141 2 1 1 2 0 8 0 amappl13 176 13 0 11 1 0 1 1 0 8 0 amappl12 168 1662 0 1633 2 0 2 2 0 8 0 amappl11 160 53 0 43 1 0 1 1 0 8 0 amappl10 152 36 0 26 2 1 1 1 0 8 0 amappl9 144 210 0 209 2 1 1 1 0 8 0 amappl8 136 192 0 133 3 0 3 3 0 8 0 amappl7 128 99 0 89 1 0 1 1 0 8 0 amappl6 120 253 0 236 2 1 1 2 0 8 0 amappl5 112 182 0 173 1 0 1 1 0 8 0 amappl4 104 567 0 535 2 1 1 2 0 8 0 amappl3 96 6294 0 6207 5 2 3 3 0 8 0 amappl2 88 1281 0 1220 3 1 2 3 0 8 0 amappl1 80 12023 0 11516 22 10 12 22 0 8 0 amappl 88 8703 0 8466 6 0 6 6 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 1029 0 1002 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1029 0 1002 1 0 1 1 0 8 0 vmmpekpl 168 13608 0 13563 3 0 3 3 0 8 0 vmmpepl 168 84744 0 82580 121 23 98 115 0 357 3 vmsppl 368 1028 0 1002 3 0 3 3 0 8 0 rwobjpl 24 32185 0 27889 26 0 26 26 0 8 0 pdppl 4096 2065 0 2004 151 88 63 67 0 8 2 pvpl 32 596565 0 577754 361 72 289 361 0 265 135 pmappl 216 1028 0 1002 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 882 0 217 19 0 19 19 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8278639c) at panic+0x165 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e9201b8) at ufs_rename+0x15b1 sys/ufs/ufs/ufs_vnops.c:908 VOP_RENAME(fffffd807e8f9cf8,fffffd807e8f97e8,ffff80002e920388,fffffd807e8f9cf8,0,ffff80002e9202d8) at VOP_RENAME+0xf4 sys/kern/vfs_vops.c:370 dorenameat(ffff8000fffea5a0,ffffff9c,200005c0,ffffff9c,200006c0) at dorenameat+0x2a0 sys/kern/vfs_syscalls.c:2994 syscall(ffff80002e920520) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf32379146f0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8278639c) at panic+0x165 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e9201b8) at ufs_rename+0x15b1 sys/ufs/ufs/ufs_vnops.c:908 VOP_RENAME(fffffd807e8f9cf8,fffffd807e8f97e8,ffff80002e920388,fffffd807e8f9cf8,0,ffff80002e9202d8) at VOP_RENAME+0xf4 sys/kern/vfs_vops.c:370 dorenameat(ffff8000fffea5a0,ffffff9c,200005c0,ffffff9c,200006c0) at dorenameat+0x2a0 sys/kern/vfs_syscalls.c:2994 syscall(ffff80002e920520) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf32379146f0, count: -7