panic: ufs_rename: lost dir entry Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *458853 1892 0 0x1000 0x4080000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82587872) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e8eb5d8) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd2798,fffffd806804c7a0,ffff80002e8eb7a8,fffffd806804ccb0,fffffd806804c368,ffff80002e8eb6f8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff80002620ea88,25,20000180,47,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e8eb940) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe83268b9590, 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(ffffffff82587872) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e8eb5d8) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd2798,fffffd806804c7a0,ffff80002e8eb7a8,fffffd806804ccb0,fffffd806804c368,ffff80002e8eb6f8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff80002620ea88,25,20000180,47,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e8eb940) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe83268b9590, count: -7 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002e8eb370 rbx 0xfffffd806804c518 rdx 0 rcx 0 rax 0xffff80002620ea88 r8 0x101010101010101 r9 0x8080808080808080 r10 0x4f0d73e64cf56db5 r11 0x755fe2f03b27a49f r12 0 r13 0xfffffd8069af7f10 r14 0 r15 0x1 rip 0xffffffff813f8a98 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e8eb360 ss 0 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=458853 stat=onproc flags process=1000 proc=4080000 pri=32, usrpri=74, nice=20 forw=0xffffffffffffffff, list=0xffff80002170aa80,0xffff80002620e018 process=0xffff8000217afb88 user=0xffff80002e8e6000, vmspace=0xfffffd806cb3ebc0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 56974 232001 71688 0 3 0x80 nanoslp syz-executor.4 56974 33362 71688 0 3 0x4000080 fsleep syz-executor.4 56974 148543 71688 0 2 0x4000000 syz-executor.4 56974 355092 71688 0 3 0x4000080 fsleep syz-executor.4 * 1892 458853 68502 0 7 0x4081000 syz-executor.1 1892 317983 68502 0 3 0x4003000 suspend syz-executor.1 41876 76585 95462 0 2 0 syz-executor.5 41876 294062 95462 0 3 0x4000080 ttyout syz-executor.5 41876 269400 95462 0 3 0x4000080 ttyout syz-executor.5 41876 316849 95462 0 2 0x4000000 syz-executor.5 20403 95499 60347 0 2 0 syz-executor.2 20403 291792 60347 0 2 0x4000000 syz-executor.2 25287 39584 1936 0 2 0 syz-executor.7 25287 210248 1936 0 3 0x4000080 fsleep syz-executor.7 92951 393987 78852 0 3 0x82 piperd syz-executor.0 12346 446416 0 0 3 0x14200 acct acct 40106 358300 78852 0 3 0x82 nanoslp syz-executor.6 98386 333681 0 0 3 0x14280 nfsidl nfsio 68615 238977 0 0 3 0x14280 nfsidl nfsio 27707 122200 0 0 3 0x14280 nfsidl nfsio 53293 423494 0 0 3 0x14280 nfsidl nfsio 82701 49594 0 0 3 0x14280 nfsidl nfsio 30721 177303 0 0 3 0x14280 nfsidl nfsio 28293 30087 0 0 3 0x14280 nfsidl nfsio 82168 156643 0 0 3 0x14280 nfsidl nfsio 77620 181210 0 0 3 0x14280 nfsidl nfsio 43750 170525 0 0 3 0x14280 nfsidl nfsio 86428 116249 0 0 3 0x14280 nfsidl nfsio 41810 275679 0 0 3 0x14280 nfsidl nfsio 76576 369762 0 0 3 0x14280 nfsidl nfsio 91559 430948 0 0 3 0x14280 nfsidl nfsio 67441 488324 0 0 3 0x14280 nfsidl nfsio 97106 470253 0 0 3 0x14280 nfsidl nfsio 5170 495602 0 0 3 0x14280 nfsidl nfsio 74233 217243 0 0 3 0x14280 nfsidl nfsio 85452 337776 0 0 3 0x14280 nfsidl nfsio 47926 342997 0 0 3 0x14280 nfsidl nfsio 60347 39864 78852 0 3 0x82 nanoslp syz-executor.2 71688 327074 78852 0 3 0x82 nanoslp syz-executor.4 1936 106395 78852 0 3 0x82 nanoslp syz-executor.7 95462 394618 78852 0 3 0x82 nanoslp syz-executor.5 66116 260833 0 0 3 0x14200 bored sosplice 67839 85824 78852 0 3 0x82 nanoslp syz-executor.3 68502 10123 78852 0 3 0x82 nanoslp syz-executor.1 78852 34534 17328 0 3 0x82 thrsleep syz-fuzzer 78852 226198 17328 0 3 0x4000082 nanoslp syz-fuzzer 78852 433062 17328 0 3 0x4000082 wait syz-fuzzer 78852 158840 17328 0 3 0x4000082 thrsleep syz-fuzzer 78852 97138 17328 0 3 0x4000082 wait syz-fuzzer 78852 207573 17328 0 3 0x4000082 kqread syz-fuzzer 78852 225881 17328 0 3 0x4000082 wait syz-fuzzer 78852 335805 17328 0 3 0x4000082 thrsleep syz-fuzzer 78852 308273 17328 0 3 0x4000082 wait syz-fuzzer 78852 262325 17328 0 3 0x4000082 wait syz-fuzzer 78852 329851 17328 0 3 0x4000082 wait syz-fuzzer 78852 31165 17328 0 3 0x4000082 wait syz-fuzzer 78852 296411 17328 0 3 0x4000082 thrsleep syz-fuzzer 78852 73350 17328 0 3 0x4000082 wait syz-fuzzer 17328 203918 79775 0 3 0x10008a sigsusp ksh 79775 36925 74767 0 3 0x9a kqread sshd 74238 56292 1 0 3 0x100083 ttyopn getty 74767 498969 1 0 3 0x88 kqread sshd 99135 387247 10379 73 3 0x1100090 kqread syslogd 10379 379566 1 0 3 0x100082 netio syslogd 56636 53417 1 0 3 0x100080 kqread resolvd 81325 425620 17217 77 3 0x100092 kqread dhcpleased 19598 508825 17217 77 3 0x100092 kqread dhcpleased 17217 265676 1 0 3 0x80 kqread dhcpleased 37478 1569 0 0 3 0x14200 bored smr 88082 286843 0 0 2 0x14200 zerothread 73910 494565 0 0 3 0x14200 aiodoned aiodoned 88884 346288 0 0 3 0x14200 syncer update 49036 340731 0 0 3 0x14200 cleaner cleaner 3672 167841 0 0 3 0x14200 reaper reaper 32384 299487 0 0 3 0x14200 pgdaemon pagedaemon 77335 257388 0 0 3 0x14200 bored viomb 33520 182107 0 0 3 0x40014200 acpi0 acpi0 95115 116804 0 0 3 0x14200 bored softnet 80328 468520 0 0 3 0x14200 bored softnet 13720 422767 0 0 3 0x14200 bored softnet 79749 505915 0 0 3 0x14200 bored softnet 33124 27115 0 0 3 0x14200 bored systqmp 78071 461274 0 0 3 0x14200 bored systq 95534 284487 0 0 3 0x40014200 bored softclock 73150 486462 0 0 3 0x40014200 idle0 1 512069 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 10252 6534K 6941K 78643K 14365 0 pcb 13 11K 12K 78643K 164 0 rtable 216 13K 14K 78643K 929 0 ifaddr 96 22K 23K 78643K 742 0 counters 26 17K 17K 78643K 100 0 ioctlops 0 0K 4K 78643K 669 0 iov 0 0K 16K 78643K 172 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1360 85K 86K 78643K 2239 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 23 0 VM map 2 0K 0K 78643K 2 0 sem 11 1K 1K 78643K 11 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 15 53K 65K 78643K 2188 0 sigio 0 0K 0K 78643K 25 0 proc 58 59K 75K 78643K 803 0 subproc 104 6K 6K 78643K 208 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 232 0 in_multi 85 5K 6K 78643K 225 0 ether_multi 1 0K 0K 78643K 23 0 mrt 1 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 61 281K 281K 78643K 61 0 exec 0 0K 2K 78643K 1153 0 pfkey data 0 0K 0K 78643K 3 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 273 85K 95K 78643K 13730 0 UVM aobj 71 3K 3K 78643K 74 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 118 0 NDP 11 0K 1K 78643K 112 0 temp 125 4726K 4801K 78643K 36531 0 kqueue 14 22K 30K 78643K 608 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 120 205 0 202 3 2 1 3 0 8 0 rtentry 112 218 0 130 4 0 4 4 0 8 0 unpcb 144 959 0 946 14 13 1 6 0 8 0 syncache 296 25 0 25 5 5 0 1 0 8 0 tcpqe 32 26 0 26 5 5 0 1 0 8 0 tcpcb 768 763 0 759 19 17 2 11 0 8 1 arp 88 36 0 20 1 0 1 1 0 8 0 ipq 40 5 0 5 2 2 0 1 0 8 0 ipqe 40 11 0 11 2 2 0 1 0 8 0 inpcb 336 1787 0 1779 24 15 9 9 0 8 8 nd6 48 50 0 29 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 0 1 1 0 8 1 kcovpl 48 16 0 8 1 0 1 1 0 8 0 ppxss 1160 59 0 59 4 4 0 1 0 8 0 pppxif 1608 1 0 1 1 1 0 1 0 8 0 pfstscr 40 10 0 9 2 1 1 1 0 8 0 pfosfp 40 68 0 66 1 0 1 1 0 8 0 pfosfpen 112 68 0 0 2 0 2 2 0 8 0 pfrktable 1344 108 0 100 2 1 1 2 0 8 0 pfanchor 1280 263 0 26 20 0 20 20 0 8 0 pftag 88 3 0 0 1 0 1 1 0 8 0 pfqueue 264 36 0 36 2 2 0 1 0 8 0 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 120 20 0 18 2 1 1 1 0 8 0 pfstate 336 10 0 9 2 1 1 1 0 8 0 pfrule 1360 128 0 107 3 1 2 2 0 8 0 art_heap8 4096 2 0 1 2 1 1 2 0 8 0 art_heap4 256 928 0 547 35 8 27 29 0 8 2 art_table 32 930 0 548 4 0 4 4 0 8 0 art_node 16 214 0 137 1 0 1 1 0 8 0 sysvmsgpl 40 25 0 14 1 0 1 1 0 8 0 semupl 112 5 0 5 2 2 0 1 0 8 0 semapl 112 9 0 0 1 0 1 1 0 8 0 shmpl 112 71 0 3 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 4635 0 3194 91 0 91 91 0 8 0 ffsino 240 4635 0 3194 86 0 86 86 0 8 0 nchpl 144 8759 0 7140 63 1 62 63 0 8 0 rtmask 32 4 0 4 2 2 0 1 0 8 0 uvmvnodes 80 5407 0 0 111 0 111 111 0 8 0 vnodes 216 5407 0 0 301 0 301 301 0 8 0 namei 1024 39613 0 39611 5 4 1 2 0 8 0 vmpool 536 4 0 4 1 1 0 1 0 8 0 pfiaddrpl 120 35 0 28 1 0 1 1 0 8 0 kstatmem 264 158 0 136 2 0 2 2 0 8 0 scsiplug 72 4 0 4 1 1 0 1 0 8 0 scxspl 216 24510 0 24510 12 10 2 8 0 8 2 plimitpl 152 275 0 258 1 0 1 1 0 8 0 sigapl 424 2501 0 2435 8 0 8 8 0 8 0 futexpl 64 24752 0 24749 1 0 1 1 0 8 0 knotepl 120 33636 0 33554 7 4 3 7 0 8 0 kqueuepl 184 886 0 875 6 5 1 4 0 8 0 pipepl 288 404 0 376 11 8 3 7 0 8 1 fdescpl 432 2443 0 2417 4 0 4 4 0 8 0 filepl 120 18164 0 17883 27 15 12 17 0 8 3 lockfpl 104 586 0 584 1 0 1 1 0 8 0 lockfspl 48 184 0 182 1 0 1 1 0 8 0 sessionpl 144 31 0 15 1 0 1 1 0 8 0 pgrppl 48 116 0 100 1 0 1 1 0 8 0 ucredpl 104 1713 0 1703 1 0 1 1 0 8 0 zombiepl 144 2438 0 2435 1 0 1 1 0 8 0 processpl 1000 2501 0 2435 11 2 9 9 0 8 0 procpl 672 6171 0 6082 11 3 8 9 0 8 0 sosppl 168 35 0 35 5 5 0 1 0 8 0 sockpl 456 2958 0 2934 65 54 11 25 0 8 8 mcl64k 65536 78 0 78 4 3 1 1 0 8 1 mcl16k 16384 41 0 41 5 5 0 1 0 8 0 mcl12k 12288 91 0 91 3 2 1 1 0 8 1 mcl9k 9216 17 0 17 4 3 1 1 0 8 1 mcl8k 8192 100 0 100 6 5 1 1 0 8 1 mcl4k 4096 335 0 335 2 1 1 1 0 8 1 mcl2k2 2112 83 0 83 5 5 0 1 0 8 0 mcl2k 2048 80189 0 80126 18 9 9 15 0 8 0 mtagpl 96 183 0 115 5 3 2 4 0 8 0 mbufpl 256 142978 0 142690 60 39 21 39 0 8 0 bufpl 288 7809 0 1404 458 0 458 458 0 8 0 anonpl 24 486691 0 469544 161 32 129 129 0 188 16 amapchunkpl 152 45133 0 44433 52 23 29 40 0 158 1 amappl16 200 7173 0 6572 67 26 41 45 0 8 8 amappl15 192 1061 0 1048 1 0 1 1 0 8 0 amappl14 184 351 0 346 1 0 1 1 0 8 0 amappl13 176 446 0 444 1 0 1 1 0 8 0 amappl12 168 99 0 95 1 0 1 1 0 8 0 amappl11 160 41 0 29 1 0 1 1 0 8 0 amappl10 152 378 0 374 1 0 1 1 0 8 0 amappl9 144 1134 0 1125 2 1 1 1 0 8 0 amappl8 136 854 0 788 3 0 3 3 0 8 0 amappl7 128 263 0 245 1 0 1 1 0 8 0 amappl6 120 474 0 454 2 1 1 2 0 8 0 amappl5 112 2072 0 2056 1 0 1 1 0 8 0 amappl4 104 1282 0 1254 2 0 2 2 0 8 0 amappl3 96 6679 0 6626 2 0 2 2 0 8 0 amappl2 88 2836 0 2772 3 1 2 3 0 8 0 amappl1 80 60489 0 59781 21 5 16 21 0 8 0 amappl 88 13110 0 12941 6 2 4 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 73 0 3 2 0 2 2 0 8 0 uaddrrnd 24 2447 0 2421 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2447 0 2421 1 0 1 1 0 8 0 vmmpekpl 168 23112 0 23055 3 0 3 3 0 8 0 vmmpepl 168 245007 0 242355 175 38 137 150 0 357 12 vmsppl 272 2446 0 2421 3 1 2 2 0 8 0 rwobjpl 24 67031 0 59853 44 0 44 44 0 8 0 pdppl 4096 4900 0 4842 168 104 64 66 0 8 6 pvpl 32 1011417 0 988915 325 108 217 258 0 265 30 pmappl 216 2446 0 2421 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 989 0 207 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(ffffffff82587872) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e8eb5d8) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd2798,fffffd806804c7a0,ffff80002e8eb7a8,fffffd806804ccb0,fffffd806804c368,ffff80002e8eb6f8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff80002620ea88,25,20000180,47,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e8eb940) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe83268b9590, 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(ffffffff82587872) at panic+0x161 sys/kern/subr_prf.c:198 ufs_rename(ffff80002e8eb5d8) at ufs_rename+0x1649 sys/ufs/ufs/ufs_vnops.c:909 VOP_RENAME(fffffd807efd2798,fffffd806804c7a0,ffff80002e8eb7a8,fffffd806804ccb0,fffffd806804c368,ffff80002e8eb6f8) at VOP_RENAME+0xf0 sys/kern/vfs_vops.c:370 dorenameat(ffff80002620ea88,25,20000180,47,200001c0) at dorenameat+0x29c sys/kern/vfs_syscalls.c:3033 syscall(ffff80002e8eb940) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe83268b9590, count: -7