panic: vref used where vget required Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 100226 49994 0 0 0 1 syz-executor.1 *142054 49994 0 0 0x4000000 0K syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 vref(fffffd80667085c0) at vref+0x7e sys/kern/vfs_subr.c:692 namei(ffff800023ba7658) at namei+0x85b sys/kern/vfs_lookup.c:328 sys_unveil(ffff800020ab0290,ffff800023ba7798,ffff800023ba77e0) at sys_unveil+0x22e sys/kern/vfs_syscalls.c:1024 syscall(ffff800023ba7860) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023ba7860) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,8,0,2,ad539e0a280) at Xsyscall+0x128 end of kernel end trace frame: 0xad7f881dd60, 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 vref used where vget required ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 vref(fffffd80667085c0) at vref+0x7e sys/kern/vfs_subr.c:692 namei(ffff800023ba7658) at namei+0x85b sys/kern/vfs_lookup.c:328 sys_unveil(ffff800020ab0290,ffff800023ba7798,ffff800023ba77e0) at sys_unveil+0x22e sys/kern/vfs_syscalls.c:1024 syscall(ffff800023ba7860) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023ba7860) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,8,0,2,ad539e0a280) at Xsyscall+0x128 end of kernel end trace frame: 0xad7f881dd60, count: -7 ddb{0}> show registers rdi 0xffffffff81b16567 db_enter+0x17 rsi 0x1210 __ALIGN_SIZE+0x210 rbp 0xffff800023ba74b0 rbx 0xffff800023ba7560 rdx 0x1211 __ALIGN_SIZE+0x211 rcx 0xffff800021d72000 rax 0xffff800021d72000 r8 0xffffffff81da18ff kprintf+0x16f r9 0x1 r10 0x25 r11 0xdb300b48eea6ade9 r12 0x3000000008 r13 0xffff800023ba74c0 r14 0x100 r15 0x1 rip 0xffffffff81b16568 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023ba74a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=142054 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=59, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab0c70,0xffff800020ab1b50 process=0xffff800020adc000 user=0xffff800023ba2000, vmspace=0xfffffd807f00b5c0 estcpu=9, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 49994 100226 77865 0 7 0 syz-executor.1 49994 128418 77865 0 3 0x4000080 netio syz-executor.1 49994 150424 77865 0 2 0x4000000 syz-executor.1 49994 173121 77865 0 3 0x4000080 fsleep syz-executor.1 *49994 142054 77865 0 7 0x4000000 syz-executor.1 49994 458155 77865 0 3 0x4000080 fsleep syz-executor.1 49994 492784 77865 0 3 0x4000080 netio syz-executor.1 77865 304657 22182 0 3 0x82 nanosleep syz-executor.1 52371 515446 22182 0 3 0x82 piperd syz-executor.0 87822 429101 0 0 3 0x14200 bored sosplice 22182 239940 1034 0 3 0x82 thrsleep syz-fuzzer 22182 166518 1034 0 3 0x4000082 thrsleep syz-fuzzer 22182 118484 1034 0 3 0x4000082 thrsleep syz-fuzzer 22182 429902 1034 0 3 0x4000082 thrsleep syz-fuzzer 22182 354374 1034 0 3 0x4000082 thrsleep syz-fuzzer 22182 364411 1034 0 3 0x4000082 thrsleep syz-fuzzer 22182 273804 1034 0 3 0x4000082 thrsleep syz-fuzzer 22182 451754 1034 0 3 0x4000082 thrsleep syz-fuzzer 22182 475193 1034 0 3 0x4000082 thrsleep syz-fuzzer 22182 165618 1034 0 3 0x4000082 kqread syz-fuzzer 1034 463666 1309 0 3 0x10008a pause ksh 1309 499638 78105 0 3 0x92 select sshd 56374 389529 1 0 3 0x100083 ttyin getty 78105 282598 1 0 3 0x80 select sshd 5917 352934 13789 74 3 0x100092 bpf pflogd 13789 477044 1 0 3 0x80 netio pflogd 19052 360085 43967 73 3 0x100090 kqread syslogd 43967 503909 1 0 3 0x100082 netio syslogd 79634 290671 1 77 3 0x100090 poll dhclient 45954 64261 1 0 3 0x80 poll dhclient 41432 205586 0 0 3 0x14200 pgzero zerothread 61123 239011 0 0 3 0x14200 aiodoned aiodoned 62052 223878 0 0 3 0x14200 syncer update 15789 312341 0 0 3 0x14200 cleaner cleaner 55700 30010 0 0 3 0x14200 reaper reaper 63583 462756 0 0 3 0x14200 pgdaemon pagedaemon 72712 184304 0 0 3 0x14200 bored crynlk 94581 467848 0 0 3 0x14200 bored crypto 74586 398342 0 0 3 0x40014200 acpi0 acpi0 75932 187729 0 0 3 0x40014200 idle1 7714 207270 0 0 3 0x14200 bored softnet 63897 263034 0 0 3 0x14200 bored systqmp 66855 279698 0 0 3 0x14200 bored systq 89015 490184 0 0 3 0x40014200 bored softclock 87314 84163 0 0 3 0x40014200 idle0 32805 338266 0 0 3 0x14200 bored smr 1 85807 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 49994 (syz-executor.1) thread 0xffff800020ab0290 (142054) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8266baa8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x392 sys/kern/sched_bsd.c:441 #3 sleep_finish+0x113 sys/kern/kern_synch.c:373 #4 rw_enter+0x352 sys/kern/kern_rwlock.c:282 #5 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #6 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615 #7 vn_lock+0x81 sys/kern/vfs_vnops.c:562 #8 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:418 #9 namei+0x62c sys/kern/vfs_lookup.c:248 #10 sys_unveil+0x22e sys/kern/vfs_syscalls.c:1024 #11 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #11 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #12 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9526 6430K 7040K 78643K 12895 0 0 pcb 13 8K 8K 78643K 179 0 0 rtable 91 4K 4K 78643K 629 0 0 ifaddr 57 13K 15K 78643K 191 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1521 0 0 iov 0 0K 16K 78643K 80 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1206 76K 77K 78643K 2076 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 16 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 123 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1809 196K 290K 78643K 12843 0 0 file desc 5 13K 25K 78643K 1023 0 0 sigio 0 0K 0K 78643K 4 0 0 proc 61 71K 83K 78643K 707 0 0 subproc 32 2K 2K 78643K 119 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 70 0 0 in_multi 22 1K 2K 78643K 120 0 0 ether_multi 1 0K 0K 78643K 8 0 0 mrt 1 0K 0K 78643K 9 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 72 318K 318K 78643K 72 0 0 exec 0 0K 1K 78643K 354 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 104 21K 25K 78643K 4168 0 0 UVM aobj 34 3K 3K 78643K 37 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 0K 78643K 169 0 0 NDP 14 0K 0K 78643K 57 0 0 temp 172 3555K 3628K 78643K 15032 0 0 kqueue 0 0K 0K 78643K 5 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 16 0 12 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 82 0 80 1 0 1 1 0 8 0 rtentry 112 101 0 67 2 0 2 2 0 8 0 unpcb 120 372 0 358 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 5942 0 5942 2 2 0 1 0 8 0 tcpcb 544 228 0 224 1 0 1 1 0 8 0 inpcb 280 682 0 675 1 0 1 1 0 8 0 rttmr 72 2 0 2 2 2 0 1 0 8 0 nd6 48 14 0 12 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 1 0 1 0 8 0 ppxss 1128 22 0 22 1 1 0 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 28 0 18 1 0 1 1 0 8 0 pfstkey 112 28 0 18 1 0 1 1 0 8 0 pfstate 328 28 0 18 2 0 2 2 0 8 0 pfrule 1360 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 256 442 0 269 14 0 14 14 0 8 3 art_table 32 443 0 269 2 0 2 2 0 8 0 art_node 16 96 0 65 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 12 3 2 1 1 0 8 0 semapl 112 121 0 111 1 0 1 1 0 8 0 shmpl 112 35 0 3 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2898 0 1496 46 0 46 46 0 8 0 ffsino 272 2898 0 1496 95 0 95 95 0 8 0 nchpl 144 4493 0 2886 61 0 61 61 0 8 0 uvmvnodes 72 3532 0 0 65 0 65 65 0 8 0 vnodes 208 3532 0 0 186 0 186 186 0 8 0 namei 1024 13772 0 13770 2 1 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 2 0 2 2 2 0 1 0 8 0 scxspl 192 12641 0 12641 12 11 1 7 0 8 1 plimitpl 152 107 0 99 1 0 1 1 0 8 0 sigapl 432 1208 0 1193 4 2 2 3 0 8 0 futexpl 56 12586 0 12584 1 0 1 1 0 8 0 knotepl 112 272 0 253 1 0 1 1 0 8 0 kqueuepl 104 174 0 172 1 0 1 1 0 8 0 pipepl 112 654 0 635 3 2 1 2 0 8 0 fdescpl 488 1209 0 1193 3 0 3 3 0 8 0 filepl 152 7138 0 7032 9 4 5 7 0 8 0 lockfpl 104 348 0 347 1 0 1 1 0 8 0 lockfspl 48 127 0 126 1 0 1 1 0 8 0 sessionpl 112 23 0 12 1 0 1 1 0 8 0 pgrppl 48 28 0 17 1 0 1 1 0 8 0 ucredpl 96 1423 0 1414 1 0 1 1 0 8 0 zombiepl 144 1193 0 1193 2 1 1 1 0 8 1 processpl 896 1225 0 1193 4 0 4 4 0 8 0 procpl 632 3188 0 3141 6 1 5 5 0 8 1 srpgc 64 14 0 14 3 2 1 1 0 8 1 sosppl 128 8 0 8 2 2 0 1 0 8 0 sockpl 384 1150 0 1127 5 2 3 4 0 8 0 mcl64k 65536 13 0 0 2 0 2 2 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 10 0 0 1 0 1 1 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 16 0 0 2 0 2 2 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 179 0 0 21 0 21 21 0 8 0 mtagpl 80 21 0 0 1 0 1 1 0 8 0 mbufpl 256 227 0 0 14 0 14 14 0 8 0 bufpl 256 9211 0 2163 441 0 441 441 0 8 0 anonpl 16 118061 0 108131 87 20 67 67 0 124 13 amapchunkpl 152 6883 0 6767 16 7 9 10 0 158 4 amappl16 192 5473 0 4759 64 20 44 48 0 8 7 amappl15 184 1 0 1 1 1 0 1 0 8 0 amappl14 176 235 0 231 1 0 1 1 0 8 0 amappl13 168 327 0 325 1 0 1 1 0 8 0 amappl12 160 2 0 2 1 1 0 1 0 8 0 amappl11 152 215 0 198 1 0 1 1 0 8 0 amappl10 144 13 0 7 1 0 1 1 0 8 0 amappl9 136 978 0 971 1 0 1 1 0 8 0 amappl8 128 493 0 469 1 0 1 1 0 8 0 amappl7 120 61 0 55 1 0 1 1 0 8 0 amappl6 112 222 0 212 1 0 1 1 0 8 0 amappl5 104 172 0 158 1 0 1 1 0 8 0 amappl4 96 1645 0 1616 1 0 1 1 0 8 0 amappl3 88 405 0 399 1 0 1 1 0 8 0 amappl2 80 8360 0 8288 3 1 2 3 0 8 0 amappl1 72 36179 0 35732 25 15 10 20 0 8 0 amappl 80 3515 0 3473 1 0 1 1 0 84 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma64 64 259 0 259 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 17 0 17 1 1 0 1 0 8 0 aobjpl 64 36 0 3 1 0 1 1 0 8 0 uaddrrnd 24 1209 0 1193 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1209 0 1193 1 0 1 1 0 8 0 vmmpekpl 168 13123 0 13090 2 0 2 2 0 8 0 vmmpepl 168 153132 0 151277 168 62 106 108 0 357 21 vmsppl 368 1208 0 1193 2 0 2 2 0 8 0 pdppl 4096 2425 0 2386 7 1 6 6 0 8 0 pvpl 32 357458 0 344308 226 56 170 170 0 265 37 pmappl 232 1208 0 1193 3 2 1 2 0 8 0 extentpl 40 38 0 22 1 0 1 1 0 8 0 phpool 112 611 0 5 18 0 18 18 0 8 0