panic: ufs_rename: lost dir entry Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *260659 37608 0 0x1000 0x4080000 1 syz-executor 290658 99699 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8358ac20) at panic+0x1e5 sys/kern/subr_prf.c:198 ufs_rename(ffff80002a377dc8) at ufs_rename+0x175f sys/ufs/ufs/ufs_vnops.c:883 VOP_RENAME(fffff20064824b48,fffff200648243b0,ffff80002a377f98,fffff20064824200,0,ffff80002a377ee8) at VOP_RENAME+0x137 sys/kern/vfs_vops.c:376 dorenameat(ffff800039795780,ffffff9c,2000000002c0,ffffff9c,200000000300) at dorenameat+0x3f7 sys/kern/vfs_syscalls.c:2981 syscall(ffff80002a378130) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a378130) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb9aef7d3d10, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: ufs_rename: lost dir entry ddb{1}> show kasan No such command ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8358ac20) at panic+0x1e5 sys/kern/subr_prf.c:198 ufs_rename(ffff80002a377dc8) at ufs_rename+0x175f sys/ufs/ufs/ufs_vnops.c:883 VOP_RENAME(fffff20064824b48,fffff200648243b0,ffff80002a377f98,fffff20064824200,0,ffff80002a377ee8) at VOP_RENAME+0x137 sys/kern/vfs_vops.c:376 dorenameat(ffff800039795780,ffffff9c,2000000002c0,ffffff9c,200000000300) at dorenameat+0x3f7 sys/kern/vfs_syscalls.c:2981 syscall(ffff80002a378130) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a378130) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb9aef7d3d10, count: -7 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a377b50 rbx 0xffff80002998ee0f rdx 0 rcx 0xffff800039795780 rax 0xffff80002998dff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xc021b012c33fc28 r11 0x733e42812acc5fa3 r12 0xffff80002998ec10 r13 0 r14 0 r15 0x1 rip 0xffffffff82140f95 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a377b40 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=260659 pid=37608 tcnt=2 stat=onproc flags process=1000 proc=4080000 runpri=32, usrpri=79, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a21b770 scnt=1 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a21c2a8,0xffff800039794a98 process=0xffff800045fecea0 user=0xffff80002a373000, vmspace=0xfffff2006cedab88 estcpu=29, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 87556 484115 43208 0 2 0 0 syz-executor 87556 430863 43208 0 3 0 0x4000080 fsleep syz-executor 87556 189687 43208 0 3 0 0x4000080 fsleep syz-executor 37608 384915 35766 0 3 0x1000 0x2000 suspend syz-executor *37608 260659 35766 0 7 0x1000 0x4080000 syz-executor 68627 327148 47623 0 2 0 0 syz-executor 68627 254904 47623 0 3 0 0x4000080 fsleep syz-executor 68627 849 47623 0 3 0 0x4000080 fsleep syz-executor 86510 72188 99567 0 2 0 0 syz-executor 86510 274030 99567 0 3 0 0x4000080 fsleep syz-executor 86510 363094 99567 0 3 0 0x4000080 fsleep syz-executor 86510 253458 99567 0 2 0 0x4000000 syz-executor 93426 312015 75442 0 3 0x2 0x80 wait syz-executor 47623 300287 75442 0 3 0x2 0x80 nanoslp syz-executor 35766 134597 75442 0 3 0x2 0x80 nanoslp syz-executor 99567 79222 75442 0 3 0x2 0x80 nanoslp syz-executor 45209 256424 75442 0 2 0x10000002 0x1 syz-executor 43208 173361 75442 0 3 0x2 0x80 nanoslp syz-executor 20680 478434 0 0 3 0x14000 0x280 nfsidl nfsio 79938 202788 0 0 3 0x14000 0x280 nfsidl nfsio 24142 192049 0 0 3 0x14000 0x280 nfsidl nfsio 37102 309423 0 0 3 0x14000 0x280 nfsidl nfsio 30295 89663 0 0 3 0x14000 0x280 nfsidl nfsio 59099 88935 0 0 3 0x14000 0x280 nfsidl nfsio 63791 132324 0 0 3 0x14000 0x280 nfsidl nfsio 78725 44039 0 0 3 0x14000 0x280 nfsidl nfsio 45254 430653 0 0 3 0x14000 0x280 nfsidl nfsio 99795 270402 0 0 3 0x14000 0x280 nfsidl nfsio 93718 219357 0 0 3 0x14000 0x280 nfsidl nfsio 98568 460281 0 0 3 0x14000 0x280 nfsidl nfsio 61245 87111 0 0 3 0x14000 0x280 nfsidl nfsio 27413 29792 0 0 3 0x14000 0x280 nfsidl nfsio 82945 196510 0 0 3 0x14000 0x280 nfsidl nfsio 39302 451981 0 0 3 0x14000 0x280 nfsidl nfsio 43578 224484 0 0 3 0x14000 0x280 nfsidl nfsio 15126 160382 0 0 3 0x14000 0x280 nfsidl nfsio 75699 156759 0 0 3 0x14000 0x280 nfsidl nfsio 85426 165176 0 0 3 0x14000 0x280 nfsidl nfsio 84169 310044 23439 0 3 0x100002 0x80 sbwait arp 23439 322419 3476 0 3 0x100002 0x88 sigsusp sh 3476 351577 75442 0 3 0x2 0x80 wait syz-executor 78783 249925 75442 0 2 0x10000002 0x80 syz-executor 75442 200178 1 0 3 0x2 0x80 kqread syz-executor 80658 56930 0 0 3 0x14000 0x200 bored smr 71115 342057 0 0 2 0x14000 0x200 zerothread 85325 39650 0 0 3 0x14000 0x200 aiodoned aiodoned 11141 432862 0 0 3 0x14000 0x200 syncer update 91883 387218 0 0 3 0x14000 0x200 cleaner cleaner 99699 290658 0 0 7 0x14000 0x200 reaper 69112 102938 0 0 3 0x14000 0x200 pgdaemon pagedaemon 70455 19491 0 0 3 0x14000 0x200 bored viomb 30382 447371 0 0 3 0x14000 0x40000200 acpi0 acpi0 1983 196435 0 0 3 0x14000 0x40000200 idle1 76974 60514 0 0 3 0x14000 0x200 bored softnet1 86812 268076 0 0 3 0x14000 0x200 bored softnet0 303 337629 0 0 3 0x14000 0x200 bored systqmp 88814 79486 0 0 3 0x14000 0x200 bored systq 39189 153048 0 0 3 0x14000 0x200 tmoslp softclockmp 84099 91762 0 0 3 0x14000 0x40000200 tmoslp softclock 26998 196049 0 0 3 0x14000 0x40000200 idle0 1 302560 0 0 3 0x30000002 0x80 nanoslp init 0 0 -1 0 3 0x10010000 0x200 scheduler swapper ddb{1}> show all locks Process 37608 (syz-executor) thread 0xffff800039795780 (260659) exclusive rrwlock inode r = 0 (0xfffff200640d4330) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vget+0x2a2 sys/kern/vfs_subr.c:692 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_relookup+0xd4 sys/kern/vfs_lookup.c:816 #11 ufs_rename+0x14aa sys/ufs/ufs/ufs_vnops.c:1007 #12 VOP_RENAME+0x137 sys/kern/vfs_vops.c:376 #13 dorenameat+0x3f7 sys/kern/vfs_syscalls.c:2981 #14 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #14 syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 #15 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffff200763b0590) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vfs_relookup+0x5c sys/kern/vfs_lookup.c:807 #6 ufs_rename+0x14aa sys/ufs/ufs/ufs_vnops.c:1007 #7 VOP_RENAME+0x137 sys/kern/vfs_vops.c:376 #8 dorenameat+0x3f7 sys/kern/vfs_syscalls.c:2981 #9 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 #10 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a8c600) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 sleep_finish+0x2d8 sys/kern/kern_synch.c:369 #3 rw_do_enter_write+0x1dc sys/kern/kern_rwlock.c:298 #4 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #5 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #6 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #7 vfs_relookup+0x5c sys/kern/vfs_lookup.c:807 #8 ufs_rename+0x14aa sys/ufs/ufs/ufs_vnops.c:1007 #9 VOP_RENAME+0x137 sys/kern/vfs_vops.c:376 #10 dorenameat+0x3f7 sys/kern/vfs_syscalls.c:2981 #11 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 #12 Xsyscall+0x128 Process 86510 (syz-executor) thread 0xffff80002a250fc8 (253458) exclusive rwlock vmmaplk r = 0 (0xfffff2006ceda8b8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:194 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:648 #7 recall_trap+0x8 Process 99699 (reaper) thread 0xffff800045ffd9f8 (290658) exclusive rwlock kmmaplk r = 0 (0xffffffff83a2e868) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5170 #3 uvm_unmap+0x7d sys/uvm/uvm_map.c:1798 #4 km_free+0x85 sys/uvm/uvm_km.c:714 #5 uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304 #6 reaper+0x1ca sys/kern/kern_exit.c:495 #7 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11048 12024K 12220K 166960K 12433 0 pcb 17 12K 12K 166960K 50 0 rtable 211 6K 6K 166960K 1142 0 pf 35 17K 24K 166960K 135 0 ifaddr 39 6K 7K 166960K 154 0 ifgroup 55 2K 2K 166960K 165 0 sysctl 4 1K 9K 166960K 9 0 counters 70 37K 37K 166960K 126 0 ioctlops 0 0K 4K 166960K 1534 0 iov 0 0K 16K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1326 83K 84K 166960K 1760 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 9 0K 0K 166960K 10 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 15 57K 97K 166960K 676 0 proc 12 17K 164K 166960K 1317 0 subproc 72 4K 4K 166960K 315 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 23 0 in_multi 79 5K 6K 166960K 377 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 9 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 49 228K 228K 166960K 49 0 exec 0 0K 1K 166960K 740 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 128 80K 176K 166960K 6828 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 17 34K 108K 166960K 2551 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 5 0 NDP 14 0K 1K 166960K 106 0 temp 39 9126K 9174K 166960K 11166 0 kqueue 1 2K 24K 166960K 44 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 28 0 0 1 0 1 1 0 8 0 rtpcb 120 93 0 92 1 0 1 1 0 8 0 rtentry 176 392 0 298 5 0 5 5 0 8 0 unpcb 144 96 0 96 1 0 1 1 0 8 1 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 43 0 42 1 0 1 1 0 8 0 arp 136 70 0 54 1 0 1 1 0 8 0 inpcb 328 291 0 290 2 1 1 2 0 8 0 nd6 152 99 0 81 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 35 0 27 1 0 1 1 0 8 0 ppxss 1192 1 0 1 1 1 0 1 0 8 0 pfstscr 40 2 0 0 1 0 1 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 0 0 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 pfanchor 1288 3 0 0 1 0 1 1 0 8 0 pfstitem 24 39 0 0 1 0 1 1 0 8 0 pfstkey 128 39 0 0 2 0 2 2 0 8 0 pfstate 448 38 0 0 5 0 5 5 0 8 0 pfrule 1360 23 0 17 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1567 0 1191 29 2 27 27 0 8 0 art_table 40 1568 0 1191 5 0 5 5 0 8 0 art_node 32 392 0 306 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 1 0 1 0 8 0 semapl 72 7 0 0 1 0 1 1 0 8 0 shmpl 120 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1888 0 343 97 0 97 97 0 8 0 ffsino 296 1888 0 343 119 0 119 119 0 8 0 nchpl 144 2304 0 493 68 0 68 68 0 8 0 vnodes 216 2305 0 0 129 0 129 129 0 8 0 namei 1024 11137 0 11135 6 4 2 3 0 8 1 percpumem 16 79 0 28 1 0 1 1 0 8 0 kstatmem 264 83 0 56 2 0 2 2 0 8 0 scxspl 216 11923 0 11923 11 3 8 8 1 8 8 plimitpl 152 71 0 54 1 0 1 1 0 8 0 sigapl 424 971 0 902 9 0 9 9 0 8 0 knotepl 120 302 0 0 10 0 10 10 0 8 0 kqueuepl 224 60 0 57 1 0 1 1 0 8 0 pipepl 344 217 0 190 4 0 4 4 0 8 0 fdescpl 528 935 0 918 3 0 3 3 0 8 0 filepl 160 3373 0 3214 11 1 10 11 0 8 0 lockfpl 104 51 0 49 1 0 1 1 0 8 0 lockfspl 48 24 0 22 1 0 1 1 0 8 0 sessionpl 144 90 0 81 1 0 1 1 0 8 0 pgrppl 48 127 0 110 1 0 1 1 0 8 0 ucredpl 104 360 0 347 1 0 1 1 0 8 0 zombiepl 144 969 0 952 1 0 1 1 0 8 0 processpl 1240 971 0 902 6 0 6 6 0 8 0 procpl 664 1302 0 1223 8 0 8 8 0 8 0 sockpl 752 488 0 486 5 3 2 5 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 131 0 0 17 0 17 17 0 8 0 mcl2k 2048 22 0 0 3 0 3 3 0 8 0 mextrefs 64 24 0 0 1 0 1 1 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 225 0 0 15 0 15 15 0 8 0 bufpl 272 4711 0 105 308 0 308 308 0 8 0 anonpl 32 7399 0 0 61 1 60 61 0 247 0 amapchunkpl 152 18899 0 18567 33 15 18 24 0 158 0 amappl16 200 2321 0 2313 28 17 11 14 0 8 9 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 759 0 758 1 0 1 1 0 8 0 amappl13 176 179 0 178 1 0 1 1 0 8 0 amappl12 168 1301 0 1285 2 0 2 2 0 8 0 amappl11 160 2 0 2 1 1 0 1 0 8 0 amappl10 152 68 0 68 1 1 0 1 0 8 0 amappl9 144 278 0 278 1 1 0 1 0 8 0 amappl8 136 210 0 210 2 1 1 1 0 8 1 amappl7 128 200 0 198 1 0 1 1 0 8 0 amappl6 120 418 0 417 1 0 1 1 0 8 0 amappl5 112 117 0 116 1 0 1 1 0 8 0 amappl4 104 373 0 371 1 0 1 1 0 8 0 amappl3 96 3395 0 3340 3 0 3 3 0 8 0 amappl2 88 968 0 948 2 0 2 2 0 8 0 amappl1 80 14500 0 14394 15 5 10 15 0 8 0 amappl 88 5612 0 5499 5 1 4 5 0 92 0 uvmvnodes 80 103 0 0 3 0 3 3 0 8 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 935 0 918 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 935 0 918 1 0 1 1 0 8 0 vmmpekpl 168 9296 0 9245 3 0 3 3 0 8 0 vmmpepl 168 69099 0 68396 103 57 46 94 0 357 8 vmsppl 488 934 0 918 5 0 5 5 0 8 0 rwobjpl 80 22647 0 22243 27 3 24 27 0 8 0 pdppl 4096 1878 0 1836 136 86 50 88 0 8 8 pvpl 32 12935 0 0 105 0 105 105 0 265 0 pmappl 256 934 0 918 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 632 0 95 16 0 16 16 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8393bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff83a8be00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a8be00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 reaper(ffff800045ffd9f8) at reaper+0x211 sys/kern/kern_exit.c:507 end trace frame: 0x0, count: 10 ddb{0}>