witness: lock_object uninitialized: 0xffff800000d88028 Starting stack trace... witness_checkorder(ffff800000d88028,9,0) at witness_checkorder+0x137 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff800000d88028,9,0) at witness_checkorder+0x137 sys/kern/subr_witness.c:777 rw_enter_write(ffff800000d88018) at rw_enter_write+0x5c sys/kern/kern_rwlock.c:128 unveil_delete_names(ffff800000d88000) at unveil_delete_names+0x34 unvname_rbt_RBT_MIN sys/kern/kern_unveil.c:92 [inline] unveil_delete_names(ffff800000d88000) at unveil_delete_names+0x34 sys/kern/kern_unveil.c:102 unveil_destroy(ffff80002614ea00) at unveil_destroy+0xad sys/kern/kern_unveil.c:183 exit1(ffff8000212ebba8,0,0,3) at exit1+0x3d5 sys/kern/kern_exit.c:220 single_thread_check_locked(ffff8000212ebba8,0,0) at single_thread_check_locked+0x237 sys/kern/kern_sig.c:2015 userret(ffff8000212ebba8) at userret+0x7c single_thread_check sys/kern/kern_sig.c:2054 [inline] userret(ffff8000212ebba8) at userret+0x7c sys/kern/kern_sig.c:1970 intr_user_exit() at intr_user_exit+0x3c end of kernel end trace frame: 0x7e394585e1f0, count: 249 End of stack trace. Stopped at db_enter+0x1c: addq $0x8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(ffff800000d88028,9,0) at witness_checkorder+0x13c witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff800000d88028,9,0) at witness_checkorder+0x13c sys/kern/subr_witness.c:777 rw_enter_write(ffff800000d88018) at rw_enter_write+0x5c sys/kern/kern_rwlock.c:128 unveil_delete_names(ffff800000d88000) at unveil_delete_names+0x34 unvname_rbt_RBT_MIN sys/kern/kern_unveil.c:92 [inline] unveil_delete_names(ffff800000d88000) at unveil_delete_names+0x34 sys/kern/kern_unveil.c:102 unveil_destroy(ffff80002614ea00) at unveil_destroy+0xad sys/kern/kern_unveil.c:183 exit1(ffff8000212ebba8,0,0,3) at exit1+0x3d5 sys/kern/kern_exit.c:220 single_thread_check_locked(ffff8000212ebba8,0,0) at single_thread_check_locked+0x237 sys/kern/kern_sig.c:2015 userret(ffff8000212ebba8) at userret+0x7c single_thread_check sys/kern/kern_sig.c:2054 [inline] userret(ffff8000212ebba8) at userret+0x7c sys/kern/kern_sig.c:1970 intr_user_exit() at intr_user_exit+0x3c end of kernel end trace frame: 0x7e394585e1f0, count: -9 ddb{1}> show registers rdi 0 rsi 0x4000000000000000 rbp 0xffff800029590e50 rbx 0x3 rdx 0 rcx 0xffff8000212ebba8 rax 0xffff800020d58ff0 r8 0xffff800029590df0 r9 0x8080808080808080 r10 0xffff800029590d40 r11 0x6794a6e06e9e593f r12 0xffff800000d88001 r13 0xffff800000d88028 r14 0 r15 0 rip 0xffffffff8275560c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800029590e40 ss 0 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=5684 stat=onproc flags process=1008 proc=82000 pri=0, usrpri=75, nice=20 forw=0xffffffffffffffff, list=0xffff8000212eb638,0xffff8000212eae20 process=0xffff80002614ea00 user=0xffff80002958c000, vmspace=0xfffffd806d5991e0 estcpu=25, cpticks=9, pctcpu=0.13 user=0, sys=9, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 81866 506442 34610 0 2 0 syz-executor.6 68876 159365 42405 0 7 0 syz-executor.4 68876 399160 42405 0 3 0x4000080 fsleep syz-executor.4 68876 324999 42405 0 2 0x4000000 syz-executor.4 68876 224014 42405 0 3 0x4000080 fsleep syz-executor.4 27685 185755 12309 0 3 0x2 biowait syz-executor.3 15887 310150 0 0 3 0x14200 acct acct 20778 211902 1 0 3 0x100083 ttyin getty 44537 305916 0 0 3 0x14200 bored sosplice 20959 364804 12309 0 2 0x2 syz-executor.7 9414 223466 12309 0 2 0x2 syz-executor.5 34610 95282 12309 0 3 0x82 nanoslp syz-executor.6 42405 53763 12309 0 3 0x82 nanoslp syz-executor.4 49940 267545 12309 0 2 0x2 syz-executor.2 49198 471559 12309 0 3 0x82 nanoslp syz-executor.1 32470 188285 12309 0 3 0x2 biowait syz-executor.0 12309 456879 18862 0 3 0x2000082 wait syz-fuzzer 12309 225685 18862 0 3 0x6000082 nanoslp syz-fuzzer 12309 79131 18862 0 3 0x6000082 wait syz-fuzzer 12309 283102 18862 0 3 0x6000082 thrsleep syz-fuzzer 12309 167212 18862 0 3 0x6000082 thrsleep syz-fuzzer 12309 41789 18862 0 3 0x6000082 thrsleep syz-fuzzer 12309 370220 18862 0 3 0x6000082 wait syz-fuzzer 12309 408148 18862 0 3 0x6000082 wait syz-fuzzer 12309 177048 18862 0 3 0x6000082 wait syz-fuzzer 12309 245920 18862 0 3 0x6000082 wait syz-fuzzer 12309 15262 18862 0 3 0x6000082 thrsleep syz-fuzzer 12309 429879 18862 0 3 0x6000082 thrsleep syz-fuzzer 12309 93380 18862 0 3 0x6000082 wait syz-fuzzer 12309 356034 18862 0 3 0x6000082 kqread syz-fuzzer 12309 334660 18862 0 3 0x6000082 thrsleep syz-fuzzer 12309 232872 18862 0 3 0x6000082 wait syz-fuzzer 18862 13988 41174 0 3 0x10008a sigsusp ksh 41174 271159 40342 0 3 0x9a kqread sshd 40342 254406 1 0 3 0x88 kqread sshd 7821 261098 94960 74 3 0x1100092 bpf pflogd 94960 405762 1 0 3 0x80 netio pflogd 41734 457797 79692 73 3 0x1100090 kqread syslogd 79692 296909 1 0 3 0x100082 netio syslogd 23042 415650 1 0 3 0x100080 kqread resolvd 43784 211304 30086 77 3 0x100092 kqread dhcpleased 65378 113352 30086 77 3 0x100092 kqread dhcpleased 30086 506315 1 0 3 0x80 kqread dhcpleased 79086 64894 0 0 3 0x14200 bored smr 58909 329853 0 0 2 0x14200 zerothread 65131 401599 0 0 3 0x14200 aiodoned aiodoned 34135 100105 0 0 3 0x14200 syncer update 81758 356124 0 0 3 0x14200 cleaner cleaner 51010 379611 0 0 3 0x14200 reaper reaper 74682 298062 0 0 3 0x14200 pgdaemon pagedaemon 57410 174310 0 0 3 0x14200 bored viomb 80930 50425 0 0 3 0x40014200 acpi0 acpi0 15854 383361 0 0 3 0x40014200 idle1 64173 204326 0 0 3 0x14200 bored softnet3 52117 238263 0 0 3 0x14200 bored softnet2 27945 134509 0 0 3 0x14200 bored softnet1 96965 455099 0 0 2 0x14200 softnet0 54807 41685 0 0 3 0x14200 bored systqmp 20413 174990 0 0 3 0x14200 bored systq 86271 174292 0 0 3 0x40014200 bored softclock 32280 152715 0 0 3 0x40014200 idle0 1 170839 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 27685 (syz-executor.3) thread 0xffff8000212eb638 (185755) exclusive rrwlock inode r = 0 (0xfffffd806ef0d6f8) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vget+0x200 sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1314 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6e2 sys/kern/vfs_lookup.c:566 #11 namei+0x55a sys/kern/vfs_lookup.c:250 #12 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847 #13 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #13 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806680be70) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vget+0x200 sys/kern/vfs_subr.c:676 #6 cache_lookup+0x2b4 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1ac sys/ufs/ufs/ufs_lookup.c:162 #8 VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x6e2 sys/kern/vfs_lookup.c:566 #10 namei+0x55a sys/kern/vfs_lookup.c:250 #11 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847 #12 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #12 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #13 Xsyscall+0x128 Process 32470 (syz-executor.0) thread 0xffff800021236af8 (188285) exclusive rrwlock inode r = 0 (0xfffffd806edf35f0) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vget+0x200 sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1314 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6e2 sys/kern/vfs_lookup.c:566 #11 namei+0x55a sys/kern/vfs_lookup.c:250 #12 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847 #13 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #13 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80699030a0) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd5 sys/kern/vfs_lookup.c:418 #6 namei+0x55a sys/kern/vfs_lookup.c:250 #7 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847 #8 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #8 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10200 6550K 6865K 78643K 14347 0 pcb 13 10K 12K 78643K 318 0 rtable 243 7K 7K 78643K 408 0 pf 32 9K 10K 78643K 51 0 ifaddr 45 15K 15K 78643K 56 0 ifgroup 55 2K 2K 78643K 65 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 36K 78643K 68 0 ioctlops 0 0K 4K 78643K 1672 0 iov 0 0K 14K 78643K 307 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1444 90K 91K 78643K 3361 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 16 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 110 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 12 41K 81K 78643K 2122 0 sigio 0 0K 0K 78643K 59 0 proc 75 115K 115K 78643K 693 0 subproc 104 6K 6K 78643K 117 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 22 0 in_multi 99 7K 7K 78643K 127 0 ether_multi 1 0K 0K 78643K 1 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 85 387K 387K 78643K 85 0 exec 0 0K 1K 78643K 686 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 342 87K 89K 78643K 23664 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 18 0 NDP 12 0K 2K 78643K 34 0 temp 73 5916K 5992K 78643K 13098 0 kqueue 13 20K 28K 78643K 127 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 84 0 81 1 0 1 1 0 8 0 rtentry 112 125 0 12 4 0 4 4 0 8 0 unpcb 144 980 0 965 16 15 1 6 0 8 0 syncache 296 21 0 21 9 9 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 460 0 460 8 8 0 2 0 8 0 tcpcb 808 359 0 355 16 15 1 8 0 8 0 arp 120 21 0 2 1 0 1 1 0 8 0 inpcb 368 920 0 908 37 35 2 7 0 8 0 nd6 136 29 0 3 1 0 1 1 0 8 0 pkpcb 40 7 0 7 2 2 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1256 3 0 3 1 1 0 1 0 8 0 pffrag 232 9 0 9 3 3 0 1 0 482 0 pffrnode 88 9 0 9 3 3 0 1 0 8 0 pffrent 40 26 0 26 3 3 0 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 pfstitem 24 87 0 80 1 0 1 1 0 8 0 pfstkey 128 87 0 80 1 0 1 1 0 8 0 pfstate 376 87 0 80 7 5 2 3 0 8 0 pfrule 1344 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 256 504 0 44 29 0 29 29 0 8 0 art_table 32 505 0 44 4 0 4 4 0 8 0 art_node 16 124 0 21 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 3 1 1 0 1 0 8 0 semapl 112 103 0 93 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 4739 0 3284 92 0 92 92 0 8 0 ffsino 272 4739 0 3284 98 0 98 98 0 8 0 nchpl 144 7636 0 5983 63 0 63 63 0 8 0 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 27552 0 27552 5 4 1 2 0 8 1 percpumem 16 47 0 4 1 0 1 1 0 8 0 kstatmem 264 32 0 8 2 0 2 2 0 8 0 scxspl 216 21153 0 21151 17 16 1 8 1 8 0 plimitpl 152 338 0 322 1 0 1 1 0 8 0 sigapl 424 2445 0 2400 7 1 6 6 0 8 0 futexpl 64 15042 0 15040 1 0 1 1 0 8 0 knotepl 120 471 0 0 12 3 9 10 0 8 0 kqueuepl 216 246 0 237 5 4 1 5 0 8 0 pipepl 320 564 0 536 24 17 7 8 0 8 4 fdescpl 496 2425 0 2400 6 2 4 5 0 8 0 filepl 152 15544 0 15300 84 70 14 22 0 8 4 lockfpl 104 519 0 516 3 2 1 2 0 8 0 lockfspl 48 224 0 221 1 0 1 1 0 8 0 sessionpl 144 26 0 9 1 0 1 1 0 8 0 pgrppl 48 70 0 53 1 0 1 1 0 8 0 ucredpl 104 4593 0 4581 1 0 1 1 0 8 0 zombiepl 144 2816 0 2815 1 0 1 1 0 8 0 processpl 1072 2445 0 2400 5 1 4 4 0 8 0 procpl 696 6267 0 6204 23 15 8 9 0 8 1 sosppl 168 23 0 23 3 3 0 1 0 8 0 sockpl 488 2003 0 1978 81 77 4 21 0 8 0 mcl64k 65536 23 0 0 3 1 2 3 0 8 0 mcl16k 16384 11 0 0 2 0 2 2 0 8 0 mcl12k 12288 19 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 277 0 0 34 2 32 34 0 8 0 mtagpl 96 270 0 0 7 0 7 7 0 8 0 mbufpl 256 1441 0 0 85 0 85 85 0 8 0 bufpl 288 7068 0 742 453 0 453 453 0 8 0 anonpl 24 351075 0 338170 93 8 85 87 0 186 0 amapchunkpl 152 74528 0 73704 67 29 38 40 0 158 1 amappl16 200 7832 0 7457 27 6 21 23 0 8 1 amappl15 192 11 0 10 2 1 1 1 0 8 0 amappl14 184 165 0 149 2 1 1 2 0 8 0 amappl13 176 16 0 16 1 1 0 1 0 8 0 amappl12 168 3121 0 3092 4 2 2 2 0 8 0 amappl11 160 82 0 66 1 0 1 1 0 8 0 amappl10 152 37 0 26 1 0 1 1 0 8 0 amappl9 144 194 0 194 11 10 1 1 0 8 1 amappl8 136 299 0 216 3 0 3 3 0 8 0 amappl7 128 82 0 69 2 0 2 2 0 8 0 amappl6 120 305 0 281 2 1 1 2 0 8 0 amappl5 112 259 0 248 1 0 1 1 0 8 0 amappl4 104 646 0 601 3 1 2 3 0 8 0 amappl3 96 15214 0 15140 4 1 3 3 0 8 0 amappl2 88 2793 0 2723 3 1 2 3 0 8 0 amappl1 80 17081 0 16531 23 11 12 23 0 8 0 amappl 88 23067 0 22849 8 1 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 2425 0 2399 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2425 0 2399 1 0 1 1 0 8 0 vmmpekpl 168 24619 0 24565 3 0 3 3 0 8 0 vmmpepl 168 161993 0 159806 180 73 107 135 0 357 0 vmsppl 464 2424 0 2399 6 2 4 5 0 8 0 rwobjpl 56 52216 0 44678 110 3 107 107 0 8 0 pdppl 4096 4858 0 4798 332 264 68 78 0 8 8 pvpl 32 867143 0 848530 387 225 162 366 0 265 0 pmappl 248 2424 0 2399 3 1 2 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1201 0 325 26 0 26 26 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82bd4ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82cf3cd0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cf3cd0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff80002e3f3b10,ffff800000069c00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff82cf3cd0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cf3cd0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff80002e3f3c60,ffff80000067b200) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge25_untramp() at Xintr_ioapic_edge25_untramp+0x18f end of kernel end trace frame: 0x7dbafd834970, count: -9 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x1c: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(ffff800000d88028,9,0) at witness_checkorder+0x13c witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff800000d88028,9,0) at witness_checkorder+0x13c sys/kern/subr_witness.c:777 rw_enter_write(ffff800000d88018) at rw_enter_write+0x5c sys/kern/kern_rwlock.c:128 unveil_delete_names(ffff800000d88000) at unveil_delete_names+0x34 unvname_rbt_RBT_MIN sys/kern/kern_unveil.c:92 [inline] unveil_delete_names(ffff800000d88000) at unveil_delete_names+0x34 sys/kern/kern_unveil.c:102 unveil_destroy(ffff80002614ea00) at unveil_destroy+0xad sys/kern/kern_unveil.c:183 exit1(ffff8000212ebba8,0,0,3) at exit1+0x3d5 sys/kern/kern_exit.c:220 single_thread_check_locked(ffff8000212ebba8,0,0) at single_thread_check_locked+0x237 sys/kern/kern_sig.c:2015 userret(ffff8000212ebba8) at userret+0x7c single_thread_check sys/kern/kern_sig.c:2054 [inline] userret(ffff8000212ebba8) at userret+0x7c sys/kern/kern_sig.c:1970 intr_user_exit() at intr_user_exit+0x3c end of kernel end trace frame: 0x7e394585e1f0, count: -9