panic: vputonfreelist: lock count is not zero Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 71833 48421 0 0 0x4000000 0 syz-executor.5 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8294946b) at panic+0x165 sys/kern/subr_prf.c:198 vputonfreelist(fffffd805b6c5c08) at vputonfreelist+0x1a3 sys/kern/vfs_subr.c:719 vput(fffffd805b6c5c08) at vput+0xf2 sys/kern/vfs_subr.c:781 ufs_mknod(ffff800037821be0) at ufs_mknod+0xf1 sys/ufs/ufs/ufs_vnops.c:186 VOP_MKNOD(fffffd80662397e0,ffff800037821d40,ffff800037821d70,ffff800037821c70) at VOP_MKNOD+0xc3 sys/kern/vfs_vops.c:121 domknodat(ffff80002a5e6560,ffffff9c,20000040,6000,e02) at domknodat+0x32a sys/kern/vfs_syscalls.c:1627 syscall(ffff800037821f10) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x381a1247620, count: 6 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: vputonfreelist: lock count is not zero ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8294946b) at panic+0x165 sys/kern/subr_prf.c:198 vputonfreelist(fffffd805b6c5c08) at vputonfreelist+0x1a3 sys/kern/vfs_subr.c:719 vput(fffffd805b6c5c08) at vput+0xf2 sys/kern/vfs_subr.c:781 ufs_mknod(ffff800037821be0) at ufs_mknod+0xf1 sys/ufs/ufs/ufs_vnops.c:186 VOP_MKNOD(fffffd80662397e0,ffff800037821d40,ffff800037821d70,ffff800037821c70) at VOP_MKNOD+0xc3 sys/kern/vfs_vops.c:121 domknodat(ffff80002a5e6560,ffffff9c,20000040,6000,e02) at domknodat+0x32a sys/kern/vfs_syscalls.c:1627 syscall(ffff800037821f10) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x381a1247620, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800037821a70 rbx 0xfffffd8061bf1000 rdx 0 rcx 0 rax 0xffff80002a5e6560 r8 0x101010101010101 r9 0x8080808080808080 r10 0x342af1857bb56dda r11 0x245fa10807f5da71 r12 0 r13 0x1 r14 0 r15 0x1 rip 0xffffffff8177683c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800037821a60 ss 0 db_enter+0x1c: addq $0x8,%rsp ddb> show proc PROC (syz-executor.5) tid=71833 pid=48421 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=17, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002a5e7d48,0xffff80002a5e6d68 process=0xffff8000ffff4ca0 user=0xffff80003781c000, vmspace=0xfffffd805bc48708 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 82457 148596 7265 0 2 0 syz-executor.6 72816 70393 58144 0 2 0 syz-executor.1 48421 273249 68573 0 2 0 syz-executor.5 *48421 71833 68573 0 7 0x4000000 syz-executor.5 71817 54196 2563 0 2 0 syz-executor.4 71817 143967 2563 0 3 0x4000080 fsleep syz-executor.4 95099 345198 26259 0 3 0 vmmaplk syz-executor.2 95099 103943 26259 0 2 0x4000000 syz-executor.2 88764 44966 35927 0 3 0x3000 suspend syz-executor.0 88764 148569 35927 0 2 0x4081000 syz-executor.0 42906 10562 37974 0 3 0x82 nanoslp syz-executor.7 7265 145983 37974 0 3 0x82 nanoslp syz-executor.6 26992 105449 37974 0 3 0x2 biowait syz-executor.3 2563 425796 37974 0 3 0x82 nanoslp syz-executor.4 68573 411686 37974 0 3 0x82 nanoslp syz-executor.5 35927 105131 37974 0 3 0x82 nanoslp syz-executor.0 58144 249416 37974 0 3 0x82 nanoslp syz-executor.1 26259 457345 37974 0 3 0x82 nanoslp syz-executor.2 99565 256629 0 0 3 0x14280 nfsidl nfsio 6382 437384 0 0 3 0x14280 nfsidl nfsio 41564 433288 0 0 3 0x14280 nfsidl nfsio 87421 70539 0 0 3 0x14280 nfsidl nfsio 62311 207949 0 0 3 0x14280 nfsidl nfsio 72953 359899 0 0 3 0x14280 nfsidl nfsio 22248 487606 0 0 3 0x14280 nfsidl nfsio 41808 108866 0 0 3 0x14280 nfsidl nfsio 68433 352363 0 0 3 0x14280 nfsidl nfsio 76916 7201 0 0 3 0x14280 nfsidl nfsio 46947 154156 0 0 3 0x14280 nfsidl nfsio 19749 444419 0 0 3 0x14280 nfsidl nfsio 28880 43397 0 0 3 0x14280 nfsidl nfsio 89458 519141 0 0 3 0x14280 nfsidl nfsio 41283 353887 0 0 3 0x14280 nfsidl nfsio 97985 387153 0 0 3 0x14280 nfsidl nfsio 66636 172770 0 0 3 0x14280 nfsidl nfsio 65222 72152 0 0 3 0x14280 nfsidl nfsio 49502 74720 0 0 3 0x14280 nfsidl nfsio 62885 287943 0 0 3 0x14280 nfsidl nfsio 20970 282254 1 0 3 0x100083 ttyin getty 80050 352610 0 0 3 0x14200 bored sosplice 37974 479822 2955 0 3 0x2000082 wait syz-fuzzer 37974 312144 2955 0 3 0x6000082 nanoslp syz-fuzzer 37974 237293 2955 0 3 0x6000082 wait syz-fuzzer 37974 422471 2955 0 3 0x6000082 thrsleep syz-fuzzer 37974 510555 2955 0 3 0x6000082 thrsleep syz-fuzzer 37974 326025 2955 0 3 0x6000082 wait syz-fuzzer 37974 325036 2955 0 3 0x6000082 wait syz-fuzzer 37974 158737 2955 0 3 0x6000082 wait syz-fuzzer 37974 387514 2955 0 3 0x6000082 kqread syz-fuzzer 37974 10291 2955 0 3 0x6000082 thrsleep syz-fuzzer 37974 520718 2955 0 3 0x6000082 wait syz-fuzzer 37974 48996 2955 0 3 0x6000082 thrsleep syz-fuzzer 37974 33177 2955 0 3 0x6000082 wait syz-fuzzer 37974 518023 2955 0 3 0x6000082 wait syz-fuzzer 2955 378601 77190 0 3 0x10008a sigsusp ksh 77190 125139 18676 0 3 0x9a kqread sshd 18676 179869 1 0 3 0x88 kqread sshd 95983 456675 52875 73 3 0x1100090 kqread syslogd 52875 7757 1 0 3 0x100082 netio syslogd 8045 365302 1 0 3 0x100080 kqread resolvd 89687 503198 0 0 3 0x14200 bored smr 71199 453145 0 0 2 0x14200 zerothread 73005 326295 0 0 3 0x14200 aiodoned aiodoned 39438 177218 0 0 3 0x14200 syncer update 17439 37184 0 0 3 0x14200 cleaner cleaner 29995 101816 0 0 3 0x14200 reaper reaper 43296 173263 0 0 3 0x14200 pgdaemon pagedaemon 64552 372231 0 0 3 0x14200 bored viomb 54247 102670 0 0 3 0x40014200 acpi0 acpi0 78991 508620 0 0 3 0x14200 bored softnet3 490 166709 0 0 3 0x14200 bored softnet2 37391 115067 0 0 3 0x14200 bored softnet1 68434 368726 0 0 3 0x14200 bored softnet0 42462 345147 0 0 3 0x14200 bored systqmp 51187 45196 0 0 3 0x14200 bored systq 86618 81476 0 0 3 0x40014200 tmoslp softclock 96552 95091 0 0 3 0x40014200 idle0 1 208741 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 10175 6478K 6994K 166960K 24403 0 pcb 15 20K 22K 166960K 1024 0 rtable 226 15K 16K 166960K 2317 0 pf 35 9K 11K 166960K 351 0 ifaddr 44 13K 13K 166960K 331 0 ifgroup 62 2K 3K 166960K 570 0 sysctl 3 1K 2K 166960K 13 0 counters 33 17K 18K 166960K 167 0 ioctlops 0 0K 2K 166960K 702 0 iov 0 0K 28K 166960K 1026 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1458 91K 92K 166960K 6380 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 141 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 25 0 dirhash 12 2K 3K 166960K 471 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 16 57K 85K 166960K 11239 0 sigio 0 0K 0K 166960K 486 0 proc 52 42K 75K 166960K 2148 0 subproc 104 6K 7K 166960K 705 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 1722 0 in_multi 89 6K 7K 166960K 1184 0 ether_multi 1 0K 0K 166960K 16 0 mrt 0 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 2457 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 419 538K 555K 166960K 103498 0 UVM aobj 131 4K 4K 166960K 137 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 463 0 NDP 14 0K 1K 166960K 255 0 temp 76 6772K 7144K 166960K 117311 0 kqueue 6 10K 26K 166960K 828 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 579 0 578 7 1 6 6 0 8 5 rtentry 112 758 0 658 5 1 4 4 0 8 1 unpcb 144 11634 0 11628 17 9 8 8 0 8 7 syncache 320 67 0 67 3 2 1 1 0 8 1 tcpqe 32 303 0 303 3 2 1 1 0 8 1 tcpcb 808 4659 0 4653 40 31 9 15 0 8 8 arp 88 136 0 118 1 0 1 1 0 8 0 ipq 40 7 0 7 2 1 1 1 0 8 1 ipqe 40 24 0 24 2 1 1 1 0 8 1 inpcb 344 12678 0 12671 61 52 9 19 0 8 8 nd6 104 164 0 143 1 0 1 1 0 8 0 pkpcb 40 18 0 18 1 0 1 1 0 8 1 kcovpl 48 54 0 46 1 0 1 1 0 8 0 ppxss 1072 38 0 38 2 1 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2617 0 2197 60 31 29 29 0 8 2 art_table 32 2618 0 2197 4 0 4 4 0 8 0 art_node 16 689 0 601 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 7 2 1 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 15 0 5 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 323 0 306 3 0 3 3 0 8 0 dino2pl 256 17938 0 16468 93 0 93 93 0 8 0 ffsino 240 17938 0 16468 87 0 87 87 0 8 0 nchpl 144 32817 0 32318 63 33 30 63 0 8 8 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 113833 0 113832 5 3 2 3 0 8 1 vcpupl 2048 120 0 2 15 0 15 15 0 8 0 vmpool 664 140 0 22 11 0 11 11 0 8 1 kstatmem 264 296 0 268 3 0 3 3 0 8 1 scxspl 216 106527 0 106526 12 9 3 8 1 8 2 plimitpl 152 813 0 799 1 0 1 1 0 8 0 sigapl 424 11560 0 11498 8 0 8 8 0 8 0 futexpl 64 124511 0 124510 1 0 1 1 0 8 0 knotepl 120 97507 0 97441 17 7 10 11 0 8 7 kqueuepl 184 1992 0 1987 9 5 4 4 0 8 3 pipepl 288 2147 0 2118 16 9 7 7 0 8 4 fdescpl 432 11418 0 11394 4 0 4 4 0 8 1 filepl 120 72757 0 72536 32 18 14 18 0 8 7 lockfpl 104 2814 0 2813 3 1 2 2 0 8 1 lockfspl 48 777 0 776 1 0 1 1 0 8 0 sessionpl 144 72 0 57 1 0 1 1 0 8 0 pgrppl 48 149 0 134 1 0 1 1 0 8 0 ucredpl 104 7628 0 7621 1 0 1 1 0 8 0 zombiepl 144 11499 0 11498 2 1 1 1 0 8 0 processpl 1072 11560 0 11498 5 0 5 5 0 8 0 procpl 680 27845 0 27766 11 2 9 9 0 8 1 sosppl 168 116 0 116 3 2 1 1 0 8 1 sockpl 488 24945 0 24933 329 319 10 45 0 8 8 mcl64k 65536 332 0 332 3 2 1 1 0 8 1 mcl16k 16384 222 0 222 3 2 1 1 0 8 1 mcl12k 12288 314 0 314 3 2 1 1 0 8 1 mcl9k 9216 113 0 113 3 2 1 1 0 8 1 mcl8k 8192 697 0 697 2 1 1 1 0 8 1 mcl4k 4096 2323 0 2323 4 2 2 2 0 8 2 mcl2k2 2112 59 0 59 3 2 1 1 0 8 1 mcl2k 2048 89539 0 89488 53 38 15 39 0 8 8 mtagpl 96 1576 0 1576 11 3 8 11 0 8 8 mbufpl 256 246233 0 246119 308 289 19 93 0 8 6 bufpl 280 23289 0 16895 457 0 457 457 0 8 0 anonpl 24 1217754 0 1202917 157 27 130 130 0 188 11 amapchunkpl 152 329280 0 328491 57 10 47 47 0 158 8 amappl16 200 28354 0 27805 140 103 37 48 0 8 8 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 286 0 277 2 1 1 2 0 8 0 amappl13 176 19 0 19 3 2 1 1 0 8 1 amappl12 168 12794 0 12769 2 0 2 2 0 8 0 amappl11 160 59 0 55 1 0 1 1 0 8 0 amappl10 152 71 0 62 1 0 1 1 0 8 0 amappl9 144 238 0 237 1 0 1 1 0 8 0 amappl8 136 424 0 331 4 0 4 4 0 8 0 amappl7 128 283 0 260 2 0 2 2 0 8 0 amappl6 120 945 0 934 1 0 1 1 0 8 0 amappl5 112 264 0 258 1 0 1 1 0 8 0 amappl4 104 877 0 853 2 1 1 2 0 8 0 amappl3 96 64746 0 64677 3 0 3 3 0 8 0 amappl2 88 12485 0 12428 3 1 2 3 0 8 0 amappl1 80 52495 0 52087 23 12 11 22 0 8 1 amappl 88 102401 0 102162 7 0 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 72 136 0 6 3 0 3 3 0 8 0 uaddrrnd 24 11558 0 11416 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 11558 0 11416 1 0 1 1 0 8 0 vmmpekpl 168 77178 0 77097 5 0 5 5 0 8 0 vmmpepl 168 715596 0 713371 172 30 142 142 0 357 31 vmsppl 352 11557 0 11416 14 0 14 14 0 8 1 rwobjpl 24 170113 0 162605 48 0 48 48 0 8 0 pdppl 4096 23122 0 22950 803 627 176 184 0 8 4 pvpl 32 3372242 0 3351584 434 214 220 362 0 265 19 pmappl 216 11557 0 11416 9 0 9 9 0 8 1 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1510 0 1039 16 0 16 16 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(ffffffff8294946b) at panic+0x165 sys/kern/subr_prf.c:198 vputonfreelist(fffffd805b6c5c08) at vputonfreelist+0x1a3 sys/kern/vfs_subr.c:719 vput(fffffd805b6c5c08) at vput+0xf2 sys/kern/vfs_subr.c:781 ufs_mknod(ffff800037821be0) at ufs_mknod+0xf1 sys/ufs/ufs/ufs_vnops.c:186 VOP_MKNOD(fffffd80662397e0,ffff800037821d40,ffff800037821d70,ffff800037821c70) at VOP_MKNOD+0xc3 sys/kern/vfs_vops.c:121 domknodat(ffff80002a5e6560,ffffff9c,20000040,6000,e02) at domknodat+0x32a sys/kern/vfs_syscalls.c:1627 syscall(ffff800037821f10) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x381a1247620, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8294946b) at panic+0x165 sys/kern/subr_prf.c:198 vputonfreelist(fffffd805b6c5c08) at vputonfreelist+0x1a3 sys/kern/vfs_subr.c:719 vput(fffffd805b6c5c08) at vput+0xf2 sys/kern/vfs_subr.c:781 ufs_mknod(ffff800037821be0) at ufs_mknod+0xf1 sys/ufs/ufs/ufs_vnops.c:186 VOP_MKNOD(fffffd80662397e0,ffff800037821d40,ffff800037821d70,ffff800037821c70) at VOP_MKNOD+0xc3 sys/kern/vfs_vops.c:121 domknodat(ffff80002a5e6560,ffffff9c,20000040,6000,e02) at domknodat+0x32a sys/kern/vfs_syscalls.c:1627 syscall(ffff800037821f10) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x381a1247620, count: -9