panic: vref used where vget required Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *447909 1666 0 0x8000002 0 0K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8305b392) at panic+0x1e5 sys/kern/subr_prf.c:198 vref(fffffd80617e1a80) at vref+0x109 sys/kern/vfs_subr.c:698 namei(ffff800036f9f178) at namei+0x533 sys/kern/vfs_lookup.c:221 vn_open(ffff800036f9f178,30001,0) at vn_open+0x13f sys/kern/vfs_vnops.c:140 doopenat(ffff800029fe71f8,ffffff9c,78073a006400,30000,0,ffff800036f9f320) at doopenat+0x31d sys/kern/vfs_syscalls.c:1123 syscall(ffff800036f9f3d0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff800036f9f3d0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78073a005f00, count: 7 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: vref used where vget required ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8305b392) at panic+0x1e5 sys/kern/subr_prf.c:198 vref(fffffd80617e1a80) at vref+0x109 sys/kern/vfs_subr.c:698 namei(ffff800036f9f178) at namei+0x533 sys/kern/vfs_lookup.c:221 vn_open(ffff800036f9f178,30001,0) at vn_open+0x13f sys/kern/vfs_vnops.c:140 doopenat(ffff800029fe71f8,ffffff9c,78073a006400,30000,0,ffff800036f9f320) at doopenat+0x31d sys/kern/vfs_syscalls.c:1123 syscall(ffff800036f9f3d0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff800036f9f3d0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78073a005f00, count: -8 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800036f9ee10 rbx 0xffffffff8345ed87 cpu_info_full_primary+0x2d87 rdx 0 rcx 0xffff800029fe71f8 rax 0xffffffff8345dff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x9ee598af6ded129c r11 0x61486ae2460f75c9 r12 0xffffffff8345eb88 cpu_info_full_primary+0x2b88 r13 0 r14 0 r15 0x1 rip 0xffffffff829f5c45 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800036f9ee00 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=447909 pid=1666 tcnt=1 stat=onproc flags process=8000002 proc=0 runpri=32, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800029fe7990,0xffff800029fe7718 process=0xffff8000371bd6a8 user=0xffff800036f9a000, vmspace=0xfffffd80606f4c18 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 20575 296880 64590 0 2 0x8000000 syz-executor 20575 433574 64590 0 3 0xc000080 sbwait syz-executor 20575 89567 64590 0 3 0xc000080 fsleep syz-executor 13816 247422 72947 0 2 0x8000000 syz-executor 13816 458970 72947 0 3 0xc000080 fsleep syz-executor 13816 135743 72947 0 2 0xc000000 syz-executor 34099 119123 83669 0 2 0x8000000 syz-executor 34099 523071 83669 0 3 0xc000080 fsleep syz-executor 64590 396507 86291 0 3 0x8000082 nanoslp syz-executor 49630 360500 86291 0 3 0x8000082 piperd syz-executor 54339 352162 86291 0 3 0x8000082 nanoslp syz-executor * 1666 447909 86291 0 7 0x8000002 syz-executor 83669 464714 86291 0 3 0x8000082 nanoslp syz-executor 67709 175374 86291 0 2 0x8000082 syz-executor 12363 245922 86291 0 3 0x8000082 nanoslp syz-executor 72947 191278 86291 0 3 0x8000082 nanoslp syz-executor 23576 355571 1 0 3 0x18100083 ttyin getty 14843 101076 0 0 3 0x14280 nfsidl nfsio 6076 244777 0 0 3 0x14280 nfsidl nfsio 67084 291496 0 0 3 0x14280 nfsidl nfsio 47038 386663 0 0 3 0x14280 nfsidl nfsio 13192 257805 0 0 3 0x14280 nfsidl nfsio 45764 193343 0 0 3 0x14280 nfsidl nfsio 37729 215557 0 0 3 0x14280 nfsidl nfsio 51558 455358 0 0 3 0x14280 nfsidl nfsio 14938 453561 0 0 3 0x14280 nfsidl nfsio 30568 522588 0 0 3 0x14280 nfsidl nfsio 85686 515138 0 0 3 0x14280 nfsidl nfsio 41186 40525 0 0 3 0x14280 nfsidl nfsio 82014 130776 0 0 3 0x14280 nfsidl nfsio 26594 436330 0 0 3 0x14280 nfsidl nfsio 15378 518259 0 0 3 0x14280 nfsidl nfsio 29264 485126 0 0 3 0x14280 nfsidl nfsio 1528 145628 0 0 3 0x14280 nfsidl nfsio 35875 207404 0 0 3 0x14280 nfsidl nfsio 60255 238105 0 0 3 0x14280 nfsidl nfsio 12198 115773 0 0 3 0x14280 nfsidl nfsio 81465 59583 0 0 3 0x14200 bored sosplice 86291 142575 51318 0 2 0x8000002 syz-executor 51318 282788 3512 0 3 0x810008a sigsusp ksh 3512 343437 49710 0 3 0x18000098 kqread sshd-session 49710 215886 54277 0 3 0x18000092 kqread sshd-session 54277 145409 1 0 3 0x18000088 kqread sshd 62854 466287 55843 74 3 0x19100092 bpf pflogd 55843 90855 1 0 3 0x18000080 sbwait pflogd 30585 384568 42885 73 2 0x19100010 syslogd 42885 384406 1 0 3 0x18100082 sbwait syslogd 3817 333174 1 0 3 0x18100080 kqread resolvd 70564 234429 88003 77 3 0x18100092 kqread dhcpleased 43772 504694 88003 77 3 0x18100092 kqread dhcpleased 88003 85798 1 0 3 0x18000080 kqread dhcpleased 96573 283314 0 0 3 0x14200 bored smr 20357 253323 0 0 2 0x14200 zerothread 26237 266777 0 0 3 0x14200 aiodoned aiodoned 13324 262950 0 0 3 0x14200 syncer update 58645 264737 0 0 3 0x14200 cleaner cleaner 40300 92295 0 0 3 0x14200 reaper reaper 41416 169837 0 0 3 0x14200 pgdaemon pagedaemon 2282 157130 0 0 3 0x14200 bored viomb 92766 224851 0 0 3 0x40014200 acpi0 acpi0 70808 220394 0 0 7 0x40014200 idle1 14760 376362 0 0 3 0x14200 bored softnet3 37964 514649 0 0 3 0x14200 bored softnet2 85512 197584 0 0 3 0x14200 bored softnet1 80787 101045 0 0 3 0x14200 bored softnet0 85578 229263 0 0 3 0x14200 bored systqmp 47123 275837 0 0 3 0x14200 bored systq 73492 369750 0 0 3 0x14200 tmoslp softclockmp 26702 260475 0 0 3 0x40014200 tmoslp softclock 81137 13386 0 0 3 0x40014200 idle0 1 362811 0 0 3 0x8000082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 1666 (syz-executor) thread 0xffff800029fe71f8 (447909) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff835edd10) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 syscall+0xad6 mi_syscall sys/sys/syscall_mi.h:179 [inline] #1 syscall+0xad6 sys/arch/amd64/amd64/trap.c:577 #2 Xsyscall+0x128 Process 30585 (syslogd) thread 0xffff8000ffffd6d8 (384568) exclusive rrwlock inode r = 0 (0xfffffd806e4991b0) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 sys_fsync+0x152 sys/kern/vfs_syscalls.c:2927 #6 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #6 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10244 10244K 10677K 166960K 14419 0 pcb 18 18K 23K 166960K 578 0 rtable 241 18K 19K 166960K 3100 0 pf 43 19K 26K 166960K 462 0 ifaddr 45 8K 8K 166960K 389 0 ifgroup 61 2K 2K 166960K 439 0 sysctl 3 0K 0K 166960K 3 0 counters 68 36K 37K 166960K 264 0 ioctlops 0 0K 4K 166960K 1840 0 iov 0 0K 14K 166960K 163 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1560 98K 98K 166960K 4556 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 13K 166960K 36 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 168 0 dirhash 18 3K 3K 166960K 45 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 15 53K 89K 166960K 2464 0 sigio 0 0K 0K 166960K 28 0 proc 70 91K 140K 166960K 2859 0 subproc 104 6K 6K 166960K 1121 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 198 0 in_multi 100 7K 7K 166960K 989 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 295 1314K 1314K 166960K 295 0 exec 0 0K 1K 166960K 1690 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 229 76K 117K 166960K 19876 0 UVM aobj 56 7K 7K 166960K 59 0 pinsyscall 40 80K 101K 166960K 5573 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 143 0 NDP 16 0K 2K 166960K 286 0 temp 74 6820K 6956K 166960K 83812 0 kqueue 13 20K 30K 166960K 242 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 24 0 0 1 0 1 1 0 8 0 rtpcb 120 387 0 384 3 2 1 2 0 8 0 rtentry 112 1025 0 925 4 1 3 4 0 8 0 unpcb 144 1973 0 1954 23 21 2 8 0 8 1 syncache 336 12 0 12 8 8 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 808 1185 0 1181 50 46 4 14 0 8 3 arp 120 189 0 171 1 0 1 1 0 8 0 inpcb 336 3550 0 3542 56 52 4 18 0 8 3 nd6 136 273 0 248 1 0 1 1 0 8 0 pkpcb 40 13 0 13 6 6 0 1 0 8 0 kcovpl 48 86 0 78 1 0 1 1 0 8 0 ppxss 1168 13 0 12 6 5 1 1 0 8 0 pfstscr 40 10 0 9 2 1 1 1 0 8 0 pffrag 232 12 0 7 1 0 1 1 0 482 0 pffrnode 88 11 0 6 1 0 1 1 0 8 0 pffrent 40 16 0 10 1 0 1 1 0 8 0 pfosfp 40 1430 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1430 0 714 21 0 21 21 0 8 0 pfrktable 1344 43 0 37 4 3 1 1 0 8 0 pfanchor 1288 19 0 13 2 1 1 1 0 8 0 pftag 88 12 0 7 3 2 1 1 0 8 0 pfqueue 264 2 0 1 1 0 1 1 0 8 0 pfstitem 24 198 0 162 1 0 1 1 0 8 0 pfstkey 128 219 0 183 2 0 2 2 0 8 0 pfstate 376 207 0 172 5 0 5 5 0 8 0 pfrule 1344 109 0 36 9 2 7 7 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 4003 0 3554 38 9 29 30 0 8 0 art_table 32 4005 0 3554 4 0 4 4 0 8 0 art_node 16 1019 0 929 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 7 1 0 1 1 0 8 0 semapl 112 166 0 156 1 0 1 1 0 8 0 shmpl 112 56 0 3 2 0 2 2 0 8 0 dirhash 1024 39 0 18 3 0 3 3 0 8 0 dino2pl 256 4299 0 2630 105 0 105 105 0 8 0 ffsino 272 4299 0 2630 113 1 112 112 0 8 0 nchpl 144 6424 0 4636 67 0 67 67 0 8 0 uvmvnodes 80 6964 0 0 143 0 143 143 0 8 0 vnodes 216 6964 0 0 387 0 387 387 0 8 0 vnodes: pool(0xffffffff8357c0d0:vnodes): page inconsistency: page 0x0; at page head addr 0xfffffd80617e1f90 (p 0xfffffd80617e1000) namei 1024 35219 0 35218 11 10 1 2 0 8 0 percpumem 16 146 0 98 1 0 1 1 0 8 0 vcpupl 3904 3 0 1 1 0 1 1 0 8 0 vmpool 696 8 0 6 1 0 1 1 0 8 0 pfiaddrpl 120 78 0 10 5 2 3 3 0 8 0 kstatmem 264 224 0 196 3 1 2 3 0 8 0 scsiplug 72 5 0 5 4 3 1 1 0 8 1 scxspl 216 53179 0 53179 14 12 2 8 1 8 2 plimitpl 152 810 0 791 1 0 1 1 0 8 0 sigapl 424 2637 0 2568 10 1 9 9 0 8 0 futexpl 64 28094 0 28091 9 8 1 1 0 8 0 knotepl 120 481 0 0 12 1 11 12 0 8 0 kqueuepl 216 522 0 513 4 1 3 3 0 8 2 pipepl 320 567 0 540 8 5 3 8 0 8 0 fdescpl 496 2591 0 2562 8 3 5 5 0 8 0 filepl 152 20997 0 20746 69 54 15 31 0 8 0 lockfpl 104 506 0 504 1 0 1 1 0 8 0 lockfspl 48 224 0 222 1 0 1 1 0 8 0 sessionpl 144 103 0 94 1 0 1 1 0 8 0 pgrppl 48 210 0 193 1 0 1 1 0 8 0 ucredpl 104 3169 0 3155 1 0 1 1 0 8 0 zombiepl 144 2571 0 2568 2 1 1 1 0 8 0 processpl 1160 2637 0 2568 6 0 6 6 0 8 0 procpl 648 4554 0 4480 9 1 8 8 0 8 0 srpgc 96 6 0 6 2 2 0 1 0 8 0 sosppl 168 12 0 12 6 6 0 1 0 8 0 sockpl 664 6069 0 6039 91 84 7 29 0 8 4 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 236 0 0 28 1 27 28 0 8 0 mtagpl 96 9 0 0 1 0 1 1 0 8 0 mbufpl 256 763 0 0 45 0 45 45 0 8 0 bufpl 280 12091 0 3412 621 0 621 621 0 8 0 anonpl 24 393073 0 389637 136 60 76 81 0 185 42 amapchunkpl 152 64219 0 63754 59 28 31 43 0 158 9 amappl16 200 6650 0 6629 48 39 9 14 0 8 7 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 278 0 266 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 4473 0 4444 3 1 2 2 0 8 0 amappl11 160 58 0 44 1 0 1 1 0 8 0 amappl10 152 51 0 51 1 1 0 1 0 8 0 amappl9 144 155 0 155 1 1 0 1 0 8 0 amappl8 136 32 0 29 1 0 1 1 0 8 0 amappl7 128 264 0 252 1 0 1 1 0 8 0 amappl6 120 946 0 944 1 0 1 1 0 8 0 amappl5 112 450 0 438 1 0 1 1 0 8 0 amappl4 104 551 0 530 1 0 1 1 0 8 0 amappl3 96 12328 0 12221 6 2 4 4 0 8 0 amappl2 88 1724 0 1660 2 0 2 2 0 8 0 amappl1 80 19470 0 18883 15 1 14 14 0 8 1 amappl 88 18838 0 18673 6 1 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 3 0 3 3 3 0 1 0 8 0 dma1024 1024 2 0 1 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 7 0 7 2 2 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 58 0 3 1 0 1 1 0 8 0 uaddrrnd 24 2599 0 2568 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2599 0 2568 1 0 1 1 0 8 0 vmmpekpl 168 21845 0 21785 4 0 4 4 0 8 0 vmmpepl 168 162638 0 160834 121 25 96 97 0 357 11 vmsppl 440 2598 0 2568 7 3 4 5 0 8 0 rwobjpl 56 53097 0 45136 115 1 114 114 0 8 1 pdppl 4096 5205 0 5138 223 148 75 85 0 8 8 pvpl 32 45767 0 0 370 1 369 369 0 265 0 pmappl 248 2598 0 2568 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 698 0 285 13 0 13 13 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8305b392) at panic+0x1e5 sys/kern/subr_prf.c:198 vref(fffffd80617e1a80) at vref+0x109 sys/kern/vfs_subr.c:698 namei(ffff800036f9f178) at namei+0x533 sys/kern/vfs_lookup.c:221 vn_open(ffff800036f9f178,30001,0) at vn_open+0x13f sys/kern/vfs_vnops.c:140 doopenat(ffff800029fe71f8,ffffff9c,78073a006400,30000,0,ffff800036f9f320) at doopenat+0x31d sys/kern/vfs_syscalls.c:1123 syscall(ffff800036f9f3d0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff800036f9f3d0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78073a005f00, count: -8 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1219 sched_idle(ffff800029b7bff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1219 sched_idle(ffff800029b7bff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -5