panic: ufs_rename: lost dir entry Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *468360 78992 0 0x1000 0x4080000 0K syz-executor.1 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827b1269) at panic+0x17b sys/kern/subr_prf.c:198 ufs_rename(ffff800021291b98) at ufs_rename+0x15b1 sys/ufs/ufs/ufs_vnops.c:908 VOP_RENAME(fffffd80661ac0f0,fffffd8067eeccc8,ffff800021291d68,fffffd80661ac0f0,0,ffff800021291cb8) at VOP_RENAME+0xf4 sys/kern/vfs_vops.c:370 dorenameat(ffff800025513080,ffffff9c,200005c0,ffffff9c,200006c0) at dorenameat+0x2a0 sys/kern/vfs_syscalls.c:2994 syscall(ffff800021291f00) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800021291f00) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc1f487f25e0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: ufs_rename: lost dir entry ddb{0}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827b1269) at panic+0x17b sys/kern/subr_prf.c:198 ufs_rename(ffff800021291b98) at ufs_rename+0x15b1 sys/ufs/ufs/ufs_vnops.c:908 VOP_RENAME(fffffd80661ac0f0,fffffd8067eeccc8,ffff800021291d68,fffffd80661ac0f0,0,ffff800021291cb8) at VOP_RENAME+0xf4 sys/kern/vfs_vops.c:370 dorenameat(ffff800025513080,ffffff9c,200005c0,ffffff9c,200006c0) at dorenameat+0x2a0 sys/kern/vfs_syscalls.c:2994 syscall(ffff800021291f00) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800021291f00) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc1f487f25e0, count: -7 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800021291920 rbx 0xffffffff82b72b9f cpu_info_full_primary+0x2b9f rdx 0 rcx 0xffff800025513080 rax 0xffffffff82b71ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x9296e4daa790e57e r11 0x505261e95122f17c r12 0xffffffff82b729a0 cpu_info_full_primary+0x29a0 r13 0 r14 0 r15 0x1 rip 0xffffffff82543dbc db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800021291910 ss 0 db_enter+0x1c: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=468360 stat=onproc flags process=1000 proc=4080000 pri=17, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000255125a0,0xffff8000211ad320 process=0xffff800021294878 user=0xffff80002128c000, vmspace=0xfffffd806efe0918 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 86097 160207 90121 0 2 0 syz-executor.4 86097 375937 90121 0 3 0x4000080 lockf syz-executor.4 86097 371446 90121 0 3 0x4000080 fsleep syz-executor.4 40503 379022 19587 0 2 0 syz-executor.7 40503 391044 19587 0 3 0x4000080 kqread syz-executor.7 40503 284196 19587 0 3 0x4000080 fsleep syz-executor.7 40503 18874 19587 0 3 0x4000080 kqread syz-executor.7 *78992 468360 16474 0 7 0x4081000 syz-executor.1 78992 316009 16474 0 3 0x4003000 suspend syz-executor.1 5066 98689 63832 0 3 0x82 piperd syz-executor.6 90121 2429 63832 0 3 0x82 nanoslp syz-executor.4 16474 57416 63832 0 3 0x82 nanoslp syz-executor.1 12174 197615 63832 0 3 0x82 piperd syz-executor.0 17902 377754 63832 0 3 0x82 piperd syz-executor.3 19801 276687 63832 0 3 0x82 piperd syz-executor.5 29698 64613 0 0 3 0x14200 bored sosplice 19587 152014 63832 0 3 0x82 nanoslp syz-executor.7 74095 54608 63832 0 3 0x82 piperd syz-executor.2 63832 412844 77753 0 3 0x2000082 thrsleep syz-fuzzer 63832 247020 77753 0 3 0x6000082 thrsleep syz-fuzzer 63832 244327 77753 0 3 0x6000082 wait syz-fuzzer 63832 157644 77753 0 3 0x6000082 thrsleep syz-fuzzer 63832 239792 77753 0 3 0x6000082 wait syz-fuzzer 63832 430721 77753 0 3 0x6000082 thrsleep syz-fuzzer 63832 432900 77753 0 3 0x6000082 wait syz-fuzzer 63832 5619 77753 0 3 0x6000082 thrsleep syz-fuzzer 63832 95982 77753 0 3 0x6000082 thrsleep syz-fuzzer 63832 487567 77753 0 3 0x6000082 wait syz-fuzzer 63832 25120 77753 0 3 0x6000082 thrsleep syz-fuzzer 63832 417652 77753 0 3 0x6000082 wait syz-fuzzer 63832 203253 77753 0 3 0x6000082 kqread syz-fuzzer 63832 152983 77753 0 3 0x6000082 wait syz-fuzzer 63832 421115 77753 0 3 0x6000082 wait syz-fuzzer 63832 242414 77753 0 3 0x6000082 wait syz-fuzzer 77753 205813 61378 0 3 0x10008a sigsusp ksh 61378 484039 29005 0 3 0x9a kqread sshd 52280 196786 1 0 3 0x100083 ttyin getty 29005 512389 1 0 3 0x88 kqread sshd 81431 477193 12177 74 3 0x1100092 bpf pflogd 12177 401799 1 0 3 0x80 netio pflogd 51474 177683 2058 73 3 0x1100090 kqread syslogd 2058 478772 1 0 3 0x100082 netio syslogd 91880 516669 1 0 3 0x100080 kqread resolvd 42197 259516 50228 77 3 0x100092 kqread dhcpleased 49719 461165 50228 77 3 0x100092 kqread dhcpleased 50228 322719 1 0 3 0x80 kqread dhcpleased 31641 97397 0 0 3 0x14200 bored smr 51560 482164 0 0 2 0x14200 zerothread 33959 40401 0 0 3 0x14200 aiodoned aiodoned 59264 508811 0 0 3 0x14200 syncer update 12389 522067 0 0 3 0x14200 cleaner cleaner 43022 482180 0 0 3 0x14200 reaper reaper 32755 59637 0 0 3 0x14200 pgdaemon pagedaemon 78774 118469 0 0 3 0x14200 bored viomb 802 129850 0 0 3 0x40014200 acpi0 acpi0 37236 288634 0 0 7 0x40014200 idle1 63926 283995 0 0 3 0x14200 bored softnet3 51022 223266 0 0 3 0x14200 bored softnet2 28803 99102 0 0 3 0x14200 bored softnet1 34553 311534 0 0 3 0x14200 bored softnet0 66545 349620 0 0 3 0x14200 bored systqmp 17821 123313 0 0 3 0x14200 bored systq 18091 360154 0 0 3 0x40014200 bored softclock 72247 209411 0 0 3 0x40014200 idle0 1 284257 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 78992 (syz-executor.1) thread 0xffff800025513080 (468360) exclusive rrwlock inode r = 0 (0xfffffd8067fb12c0) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vget+0x200 sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1314 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 #10 vfs_relookup+0xb4 sys/kern/vfs_lookup.c:787 #11 ufs_rename+0x13c4 sys/ufs/ufs/ufs_vnops.c:1042 #12 VOP_RENAME+0xf4 sys/kern/vfs_vops.c:370 #13 dorenameat+0x2a0 sys/kern/vfs_syscalls.c:2994 #14 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #14 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #15 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8067fb1f80) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vfs_relookup+0x57 sys/kern/vfs_lookup.c:778 #6 ufs_rename+0x13c4 sys/ufs/ufs/ufs_vnops.c:1042 #7 VOP_RENAME+0xf4 sys/kern/vfs_vops.c:370 #8 dorenameat+0x2a0 sys/kern/vfs_syscalls.c:2994 #9 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #9 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #10 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82c5f098) #0 witness_lock+0x447 #1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 #2 mi_switch+0x4c6 sys/kern/sched_bsd.c:470 #3 sleep_finish+0x19b sys/kern/kern_synch.c:414 #4 biowait+0x91 sys/kern/vfs_bio.c:1278 #5 bwrite+0x21c sys/kern/vfs_bio.c:769 #6 VOP_BWRITE+0x4e sys/kern/vfs_vops.c:640 #7 ufs_direnter+0x90a sys/ufs/ufs/ufs_lookup.c:909 #8 ufs_rename+0xb70 sys/ufs/ufs/ufs_vnops.c:936 #9 VOP_RENAME+0xf4 sys/kern/vfs_vops.c:370 #10 dorenameat+0x2a0 sys/kern/vfs_syscalls.c:2994 #11 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #11 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #12 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10192 6473K 6638K 78643K 11494 0 pcb 13 10K 12K 78643K 214 0 rtable 234 6K 6K 78643K 530 0 pf 32 9K 10K 78643K 73 0 ifaddr 45 15K 15K 78643K 82 0 ifgroup 55 2K 2K 78643K 109 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 36K 78643K 90 0 ioctlops 0 0K 4K 78643K 1531 0 iov 0 0K 18K 78643K 278 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1390 87K 87K 78643K 1834 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 3 5K 9K 78643K 23 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 69 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 13 45K 89K 78643K 1441 0 sigio 0 0K 0K 78643K 46 0 proc 70 91K 152K 78643K 734 0 subproc 104 6K 7K 78643K 182 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 93 0 in_multi 99 7K 7K 78643K 168 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 55 254K 254K 78643K 55 0 exec 0 0K 1K 78643K 548 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 338 85K 95K 78643K 16494 0 UVM aobj 61 2K 2K 78643K 64 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 25 0 NDP 12 0K 1K 78643K 55 0 temp 78 5919K 5984K 78643K 22028 0 kqueue 14 18K 24K 78643K 101 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 55 0 52 1 0 1 1 0 8 0 rtentry 112 177 0 67 4 0 4 4 0 8 0 unpcb 144 608 0 593 5 4 1 4 0 8 0 syncache 296 11 0 11 2 2 0 1 0 8 0 tcpqe 32 329 0 329 5 5 0 2 0 8 0 tcpcb 808 270 0 266 17 13 4 8 0 8 3 arp 120 30 0 12 1 0 1 1 0 8 0 inpcb 368 821 0 814 33 24 9 10 0 8 8 nd6 136 42 0 18 1 0 1 1 0 8 0 pkpcb 40 7 0 7 2 1 1 1 0 8 1 kcovpl 48 14 0 6 1 0 1 1 0 8 0 ppxss 1256 3 0 3 1 1 0 1 0 8 0 pffrag 232 13 0 9 1 0 1 1 0 482 0 pffrnode 88 13 0 9 1 0 1 1 0 8 0 pffrent 40 31 0 27 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 59 0 52 1 0 1 1 0 8 0 pfstkey 128 59 0 52 1 0 1 1 0 8 0 pfstate 376 59 0 52 4 2 2 3 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 720 0 264 29 0 29 29 0 8 0 art_table 32 721 0 264 4 0 4 4 0 8 0 art_node 16 176 0 76 1 0 1 1 0 8 0 sysvmsgpl 40 85 0 57 2 1 1 1 0 8 0 semupl 112 3 0 3 2 2 0 1 0 8 0 semapl 112 63 0 53 1 0 1 1 0 8 0 shmpl 112 61 0 3 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3174 0 1718 92 0 92 92 0 8 0 ffsino 272 3174 0 1718 98 0 98 98 0 8 0 nchpl 144 5122 0 3475 63 0 63 63 0 8 0 uvmvnodes 80 3600 0 0 74 0 74 74 0 8 0 vnodes 216 3600 0 0 200 0 200 200 0 8 0 namei 1024 18744 0 18742 6 5 1 2 0 8 0 percpumem 16 58 0 15 1 0 1 1 0 8 0 kstatmem 264 54 0 30 2 0 2 2 0 8 0 scxspl 216 15857 0 15857 12 11 1 8 1 8 1 plimitpl 152 463 0 447 1 0 1 1 0 8 0 sigapl 424 1763 0 1719 10 4 6 8 0 8 0 futexpl 64 9897 0 9895 1 0 1 1 0 8 0 knotepl 120 195 0 0 6 0 6 6 0 8 0 kqueuepl 216 221 0 207 6 5 1 4 0 8 0 pipepl 320 580 0 552 18 15 3 8 0 8 0 fdescpl 496 1725 0 1699 6 2 4 5 0 8 0 filepl 152 10108 0 9796 38 24 14 19 0 8 2 lockfpl 104 1763 0 1758 1 0 1 1 0 8 0 lockfspl 48 217 0 213 1 0 1 1 0 8 0 sessionpl 144 30 0 13 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 1220 0 1208 1 0 1 1 0 8 0 zombiepl 144 2164 0 2163 2 1 1 1 0 8 0 processpl 1072 1763 0 1719 5 1 4 5 0 8 0 procpl 696 4110 0 4043 13 5 8 10 0 8 0 sosppl 168 23 0 23 2 2 0 1 0 8 0 sockpl 488 1491 0 1466 48 36 12 17 0 8 8 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 5 0 0 1 0 1 1 0 8 0 mcl8k 8192 9 0 0 2 0 2 2 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 265 0 0 34 0 34 34 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 402 0 0 19 0 19 19 0 8 0 bufpl 288 6374 0 186 444 2 442 442 0 8 0 anonpl 24 338899 0 325913 115 19 96 100 0 186 11 amapchunkpl 152 53445 0 52591 57 11 46 46 0 158 6 amappl16 200 8470 0 8093 33 10 23 31 0 8 0 amappl15 192 30 0 30 1 1 0 1 0 8 0 amappl14 184 182 0 168 2 1 1 2 0 8 0 amappl13 176 24 0 23 1 0 1 1 0 8 0 amappl12 168 2471 0 2443 4 2 2 3 0 8 0 amappl11 160 57 0 43 1 0 1 1 0 8 0 amappl10 152 55 0 44 1 0 1 1 0 8 0 amappl9 144 164 0 163 2 1 1 1 0 8 0 amappl8 136 262 0 200 3 0 3 3 0 8 0 amappl7 128 69 0 56 2 0 2 2 0 8 0 amappl6 120 315 0 294 2 1 1 2 0 8 0 amappl5 112 238 0 224 1 0 1 1 0 8 0 amappl4 104 604 0 561 3 1 2 3 0 8 0 amappl3 96 10729 0 10650 4 1 3 3 0 8 0 amappl2 88 2005 0 1936 3 1 2 3 0 8 0 amappl1 80 15074 0 14521 23 10 13 23 0 8 0 amappl 88 15885 0 15661 8 1 7 7 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 63 0 3 2 0 2 2 0 8 0 uaddrrnd 24 1725 0 1699 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1725 0 1699 1 0 1 1 0 8 0 vmmpekpl 168 19447 0 19368 4 0 4 4 0 8 0 vmmpepl 168 127374 0 125186 144 31 113 125 0 357 0 vmsppl 464 1724 0 1699 6 2 4 5 0 8 0 rwobjpl 56 42193 0 37053 75 2 73 73 0 8 0 pdppl 4096 3458 0 3398 188 118 70 82 0 8 10 pvpl 32 765427 0 746769 378 199 179 364 0 265 14 pmappl 248 1724 0 1699 4 2 2 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 975 0 165 24 0 24 24 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827b1269) at panic+0x17b sys/kern/subr_prf.c:198 ufs_rename(ffff800021291b98) at ufs_rename+0x15b1 sys/ufs/ufs/ufs_vnops.c:908 VOP_RENAME(fffffd80661ac0f0,fffffd8067eeccc8,ffff800021291d68,fffffd80661ac0f0,0,ffff800021291cb8) at VOP_RENAME+0xf4 sys/kern/vfs_vops.c:370 dorenameat(ffff800025513080,ffffff9c,200005c0,ffffff9c,200006c0) at dorenameat+0x2a0 sys/kern/vfs_syscalls.c:2994 syscall(ffff800021291f00) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800021291f00) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc1f487f25e0, count: -7 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020d58ff0) at sched_idle+0x41e sys/kern/kern_sched.c:199 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020d58ff0) at sched_idle+0x41e sys/kern/kern_sched.c:199 end trace frame: 0x0, count: -5