panic: ufs_rename: lost dir entry Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *302911 66120 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8258d8af) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e987488) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd2510,fffffd8007127c30,ffff80002e987658,fffffd8007127720,fffffd8070660d80,ffff80002e9875a8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff800021772008,25,20000180,27,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e9877f0) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x82cd5f04ac0, 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(ffffffff8258d8af) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e987488) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd2510,fffffd8007127c30,ffff80002e987658,fffffd8007127720,fffffd8070660d80,ffff80002e9875a8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff800021772008,25,20000180,27,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e9877f0) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x82cd5f04ac0, count: -7 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002e987220 rbx 0xfffffd8007127de0 rdx 0 rcx 0 rax 0xffff800021772008 r8 0x101010101010101 r9 0x8080808080808080 r10 0x6b810fdadcc7b66a r11 0x112a00577ef95da4 r12 0 r13 0xfffffd807bb640f0 r14 0 r15 0x1 rip 0xffffffff81938698 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e987210 ss 0 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=302911 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=65, nice=20 forw=0xffffffffffffffff, list=0xffff800021773a48,0xffff8000217722b8 process=0xffff800026610bd8 user=0xffff80002e982000, vmspace=0xfffffd806bb2aef0 estcpu=15, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 45201 355453 20603 0 2 0 syz-executor.0 45201 76397 20603 0 2 0x4000000 syz-executor.0 45201 495389 20603 0 3 0x4000080 kqsel syz-executor.0 8098 509114 51344 0 3 0x80 nanoslp syz-executor.2 8098 132322 51344 0 3 0x4000080 fsleep syz-executor.2 99242 76948 3715 0 2 0 syz-executor.5 99242 34309 3715 0 3 0x4000080 fsleep syz-executor.5 99242 259224 3715 0 2 0x4000000 syz-executor.5 99242 111662 3715 0 3 0x4000080 fsleep syz-executor.5 37391 290508 29853 0 2 0 syz-executor.4 37391 35395 29853 0 3 0x4000080 fsleep syz-executor.4 11807 210647 86053 0 3 0x80 nanoslp syz-executor.3 11807 184908 86053 0 3 0x4000080 fsleep syz-executor.3 11807 169143 86053 0 3 0x4000080 rest syz-executor.3 11807 410362 86053 0 3 0x4000080 rest syz-executor.3 11807 169066 86053 0 3 0x4000080 fsleep syz-executor.3 11807 380894 86053 0 3 0x4000080 fsleep syz-executor.3 66120 326102 44935 0 2 0 syz-executor.1 66120 146466 44935 0 3 0x4000080 fsleep syz-executor.1 66120 174919 44935 0 2 0x4000000 syz-executor.1 *66120 302911 44935 0 7 0x4000000 syz-executor.1 35306 33499 0 0 3 0x14280 nfsidl nfsio 62757 432003 0 0 3 0x14280 nfsidl nfsio 22343 19218 0 0 3 0x14280 nfsidl nfsio 79525 264279 0 0 3 0x14280 nfsidl nfsio 75238 500861 0 0 3 0x14280 nfsidl nfsio 30877 239029 0 0 3 0x14280 nfsidl nfsio 29265 473069 0 0 3 0x14280 nfsidl nfsio 42413 349070 0 0 3 0x14280 nfsidl nfsio 50629 409139 0 0 3 0x14280 nfsidl nfsio 65725 450242 0 0 3 0x14280 nfsidl nfsio 2380 68351 0 0 3 0x14280 nfsidl nfsio 82339 232168 0 0 3 0x14280 nfsidl nfsio 63946 429065 0 0 3 0x14280 nfsidl nfsio 6927 505906 0 0 3 0x14280 nfsidl nfsio 98797 271944 0 0 3 0x14280 nfsidl nfsio 59229 214677 0 0 3 0x14280 nfsidl nfsio 83723 316581 0 0 3 0x14280 nfsidl nfsio 54071 228889 0 0 3 0x14280 nfsidl nfsio 79727 397366 0 0 3 0x14280 nfsidl nfsio 4249 464407 0 0 3 0x14280 nfsidl nfsio 46141 339383 43400 0 3 0x82 nanoslp syz-executor.7 29853 457289 43400 0 3 0x82 nanoslp syz-executor.4 3715 83388 43400 0 3 0x82 nanoslp syz-executor.5 86053 270179 43400 0 3 0x82 nanoslp syz-executor.3 57484 438759 43400 0 2 0x2 syz-executor.6 44935 190706 43400 0 3 0x82 nanoslp syz-executor.1 20603 456386 43400 0 3 0x82 nanoslp syz-executor.0 51344 201947 43400 0 3 0x82 nanoslp syz-executor.2 43400 237356 97790 0 3 0x82 thrsleep syz-fuzzer 43400 218239 97790 0 3 0x4000082 nanoslp syz-fuzzer 43400 57458 97790 0 3 0x4000082 thrsleep syz-fuzzer 43400 352733 97790 0 3 0x4000082 wait syz-fuzzer 43400 228606 97790 0 3 0x4000082 wait syz-fuzzer 43400 69561 97790 0 3 0x4000082 wait syz-fuzzer 43400 326251 97790 0 3 0x4000082 wait syz-fuzzer 43400 291762 97790 0 3 0x4000082 thrsleep syz-fuzzer 43400 386195 97790 0 3 0x4000082 wait syz-fuzzer 43400 345740 97790 0 3 0x4000082 wait syz-fuzzer 43400 407587 97790 0 3 0x4000082 wait syz-fuzzer 43400 62735 97790 0 3 0x4000082 wait syz-fuzzer 43400 441714 97790 0 3 0x4000082 kqread syz-fuzzer 43400 258504 97790 0 3 0x4000082 thrsleep syz-fuzzer 97790 293231 14392 0 3 0x10008a sigsusp ksh 14392 35978 15164 0 3 0x9a kqread sshd 94019 358035 1 0 3 0x100083 ttyin getty 15164 124116 1 0 3 0x88 kqread sshd 17005 251358 11314 73 3 0x1100090 kqread syslogd 11314 466224 1 0 3 0x100082 netio syslogd 64899 418440 1 0 3 0x100080 kqread resolvd 92304 83205 6431 77 3 0x100092 kqread dhcpleased 65876 239316 6431 77 3 0x100092 kqread dhcpleased 6431 211475 1 0 3 0x80 kqread dhcpleased 66031 183827 0 0 3 0x14200 bored smr 92904 18759 0 0 2 0x14200 zerothread 72340 455805 0 0 3 0x14200 aiodoned aiodoned 93954 375334 0 0 3 0x14200 syncer update 56893 429922 0 0 3 0x14200 cleaner cleaner 36855 39797 0 0 3 0x14200 reaper reaper 96002 513407 0 0 3 0x14200 pgdaemon pagedaemon 14054 274278 0 0 3 0x14200 bored viomb 18069 516969 0 0 3 0x40014200 acpi0 acpi0 85702 385731 0 0 3 0x14200 bored softnet 69082 339191 0 0 3 0x14200 bored softnet 11943 352588 0 0 3 0x14200 bored softnet 76285 482148 0 0 3 0x14200 bored softnet 96808 326631 0 0 3 0x14200 bored systqmp 46083 292814 0 0 3 0x14200 bored systq 36941 477072 0 0 3 0x40014200 bored softclock 92154 164630 0 0 3 0x40014200 idle0 1 499294 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 10178 6410K 6533K 78643K 11457 0 pcb 13 10K 12K 78643K 106 0 rtable 234 6K 6K 78643K 349 0 ifaddr 71 16K 16K 78643K 74 0 counters 28 17K 17K 78643K 28 0 ioctlops 0 0K 2K 78643K 32 0 iov 0 0K 12K 78643K 40 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1440 90K 90K 78643K 1473 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 0K 0K 78643K 2 0 sem 10 1K 1K 78643K 10 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 16 57K 81K 78643K 223 0 sigio 0 0K 0K 78643K 3 0 proc 57 59K 75K 78643K 470 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 99 6K 6K 78643K 103 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 43 201K 201K 78643K 43 0 exec 0 0K 1K 78643K 357 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 290 82K 83K 78643K 2972 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 4 0 NDP 11 0K 1K 78643K 27 0 temp 85 4672K 4736K 78643K 4529 0 kqueue 17 28K 28K 78643K 35 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 36 0 33 1 0 1 1 0 8 0 rtentry 112 111 0 1 4 0 4 4 0 8 0 unpcb 144 49 0 36 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpqe 32 104 0 104 1 1 0 1 0 8 0 tcpcb 776 14 0 10 1 0 1 1 0 8 0 arp 88 18 0 0 1 0 1 1 0 8 0 inpcb 336 147 0 139 6 0 6 6 0 8 5 nd6 48 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 453 0 0 29 0 29 29 0 8 0 art_table 32 454 0 0 4 0 4 4 0 8 0 art_node 16 110 0 10 1 0 1 1 0 8 0 semupl 112 6 0 6 1 0 1 1 0 8 1 semapl 112 8 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1609 0 175 90 0 90 90 0 8 0 ffsino 240 1609 0 175 85 0 85 85 0 8 0 nchpl 144 2043 0 389 63 0 63 63 0 8 0 uvmvnodes 80 1911 0 0 39 0 39 39 0 8 0 vnodes 216 1911 0 0 107 0 107 107 0 8 0 namei 1024 7316 0 7314 2 1 1 2 0 8 0 kstatmem 264 22 0 0 2 0 2 2 0 8 0 scxspl 216 6619 0 6619 5 3 2 4 0 8 2 plimitpl 152 24 0 9 1 0 1 1 0 8 0 sigapl 424 552 0 488 8 0 8 8 0 8 0 futexpl 64 1382 0 1374 1 0 1 1 0 8 0 knotepl 120 6837 0 6752 9 0 9 9 0 8 5 kqueuepl 184 74 0 60 2 0 2 2 0 8 1 pipepl 288 295 0 266 12 1 11 12 0 8 8 fdescpl 432 496 0 469 4 0 4 4 0 8 0 filepl 120 2975 0 2657 18 2 16 18 0 8 6 lockfpl 104 27 0 25 1 0 1 1 0 8 0 lockfspl 48 10 0 8 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 28 0 11 1 0 1 1 0 8 0 ucredpl 104 175 0 164 1 0 1 1 0 8 0 zombiepl 144 489 0 488 1 0 1 1 0 8 0 processpl 1008 552 0 488 10 1 9 9 0 8 0 procpl 672 764 0 672 9 0 9 9 0 8 1 sockpl 456 232 0 208 11 0 11 11 0 8 8 mcl64k 65536 24 0 24 1 0 1 1 0 8 1 mcl16k 16384 19 0 19 1 0 1 1 0 8 1 mcl12k 12288 2 0 2 1 0 1 1 0 8 1 mcl9k 9216 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 24 0 24 2 1 1 1 0 8 1 mcl4k 4096 25 0 25 1 0 1 1 0 8 1 mcl2k 2048 75807 0 75740 32 19 13 30 0 8 3 mtagpl 96 6 0 6 2 1 1 1 0 8 1 mbufpl 256 120780 0 120558 27 8 19 19 0 8 2 bufpl 288 4194 0 139 290 0 290 290 0 8 0 anonpl 24 148301 0 131599 103 0 103 103 0 188 2 amapchunkpl 152 8910 0 8176 30 0 30 30 0 158 1 amappl16 200 2721 0 2211 29 1 28 28 0 8 1 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 153 0 137 2 0 2 2 0 8 0 amappl13 176 7 0 7 1 1 0 1 0 8 0 amappl12 168 403 0 398 1 0 1 1 0 8 0 amappl11 160 46 0 36 1 0 1 1 0 8 0 amappl10 152 26 0 18 1 0 1 1 0 8 0 amappl9 144 955 0 954 2 1 1 1 0 8 0 amappl8 136 130 0 89 2 0 2 2 0 8 0 amappl7 128 126 0 110 2 0 2 2 0 8 0 amappl6 120 146 0 137 1 0 1 1 0 8 0 amappl5 112 115 0 109 1 0 1 1 0 8 0 amappl4 104 434 0 410 2 1 1 2 0 8 0 amappl3 96 892 0 835 2 0 2 2 0 8 0 amappl2 88 824 0 754 3 1 2 3 0 8 0 amappl1 80 13397 0 12657 22 6 16 22 0 8 0 amappl 88 2508 0 2324 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 496 0 469 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 496 0 469 1 0 1 1 0 8 0 vmmpekpl 168 9992 0 9946 3 0 3 3 0 8 0 vmmpepl 168 54892 0 52234 144 0 144 144 0 357 27 vmsppl 272 495 0 469 4 1 3 3 0 8 1 rwobjpl 24 18418 0 14884 22 0 22 22 0 8 0 pdppl 4096 998 0 938 92 28 64 72 0 8 4 pvpl 32 343433 0 321347 253 4 249 253 0 265 70 pmappl 216 495 0 469 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 681 0 61 18 0 18 18 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(ffffffff8258d8af) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e987488) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd2510,fffffd8007127c30,ffff80002e987658,fffffd8007127720,fffffd8070660d80,ffff80002e9875a8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff800021772008,25,20000180,27,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e9877f0) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x82cd5f04ac0, 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(ffffffff8258d8af) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e987488) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd2510,fffffd8007127c30,ffff80002e987658,fffffd8007127720,fffffd8070660d80,ffff80002e9875a8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff800021772008,25,20000180,27,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e9877f0) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x82cd5f04ac0, count: -7