witness: lock_object uninitialized: 0xffff800000d04028 Starting stack trace... witness_checkorder(ffff800000d04028,9,0) at witness_checkorder+0x133 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(ffff800000d04028,9,0) at witness_checkorder+0x133 sys/kern/subr_witness.c:772 rw_enter_write(ffff800000d04018) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 unveil_delete_names(ffff800000d04000) at unveil_delete_names+0x30 unvname_rbt_RBT_MIN sys/kern/kern_unveil.c:90 [inline] unveil_delete_names(ffff800000d04000) at unveil_delete_names+0x30 sys/kern/kern_unveil.c:100 unveil_destroy(ffff8000ffff90a8) at unveil_destroy+0xad sys/kern/kern_unveil.c:191 exit1(ffff800022c937a0,0,0,3) at exit1+0x3d5 sys/kern/kern_exit.c:225 single_thread_check_locked(ffff800022c937a0,0,0) at single_thread_check_locked+0x227 sys/kern/kern_sig.c:1958 userret(ffff800022c937a0) at userret+0x224 single_thread_check sys/kern/kern_sig.c:1999 [inline] userret(ffff800022c937a0) at userret+0x224 sys/kern/kern_sig.c:1946 syscall(ffff800027b235e0) at syscall+0x57e mi_syscall_return sys/sys/syscall_mi.h:129 [inline] syscall(ffff800027b235e0) at syscall+0x57e sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffcd3d0, count: 248 End of stack trace. Stopped at db_enter+0x18: 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+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(ffff800000d04028,9,0) at witness_checkorder+0x138 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(ffff800000d04028,9,0) at witness_checkorder+0x138 sys/kern/subr_witness.c:772 rw_enter_write(ffff800000d04018) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 unveil_delete_names(ffff800000d04000) at unveil_delete_names+0x30 unvname_rbt_RBT_MIN sys/kern/kern_unveil.c:90 [inline] unveil_delete_names(ffff800000d04000) at unveil_delete_names+0x30 sys/kern/kern_unveil.c:100 unveil_destroy(ffff8000ffff90a8) at unveil_destroy+0xad sys/kern/kern_unveil.c:191 exit1(ffff800022c937a0,0,0,3) at exit1+0x3d5 sys/kern/kern_exit.c:225 single_thread_check_locked(ffff800022c937a0,0,0) at single_thread_check_locked+0x227 sys/kern/kern_sig.c:1958 userret(ffff800022c937a0) at userret+0x224 single_thread_check sys/kern/kern_sig.c:1999 [inline] userret(ffff800022c937a0) at userret+0x224 sys/kern/kern_sig.c:1946 syscall(ffff800027b235e0) at syscall+0x57e mi_syscall_return sys/sys/syscall_mi.h:129 [inline] syscall(ffff800027b235e0) at syscall+0x57e sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffcd3d0, count: -10 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800027b23230 rbx 0x3 rdx 0 rcx 0 rax 0xffff800022c937a0 r8 0xffff800027b231d0 r9 0x8080808080808080 r10 0xde9d033eef90b449 r11 0xa15858ccfde42ae9 r12 0xffff800000d04001 r13 0xffff800000d04028 r14 0 r15 0 rip 0xffffffff81410c88 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800027b23220 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.3) pid=440565 stat=onproc flags process=1008 proc=82000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800022c93a40,0xffff800022c92d30 process=0xffff8000ffff90a8 user=0xffff800027b1e000, vmspace=0xfffffd807c59ea20 estcpu=36, cpticks=9, pctcpu=0.0 user=0, sys=8, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 79468 20181 89201 0 2 0 syz-executor.0 79468 61996 89201 0 7 0x4000000 syz-executor.0 89201 263747 83311 0 3 0x82 nanoslp syz-executor.0 10451 158033 83311 0 3 0x82 nanoslp syz-executor.3 14974 337659 83311 0 2 0x2 syz-executor.1 76965 15674 83311 0 2 0x2 syz-executor.2 78243 81272 0 0 3 0x14280 nfsidl nfsio 95126 42728 0 0 3 0x14280 nfsidl nfsio 26783 242913 0 0 3 0x14280 nfsidl nfsio 63895 113645 0 0 3 0x14280 nfsidl nfsio 28184 252615 0 0 3 0x14280 nfsidl nfsio 62254 515591 0 0 3 0x14280 nfsidl nfsio 1892 18687 0 0 3 0x14280 nfsidl nfsio 69881 400715 0 0 3 0x14280 nfsidl nfsio 85102 59425 0 0 3 0x14280 nfsidl nfsio 68470 103620 0 0 3 0x14280 nfsidl nfsio 11070 371405 0 0 3 0x14280 nfsidl nfsio 22002 482093 0 0 3 0x14280 nfsidl nfsio 34164 501769 0 0 3 0x14280 nfsidl nfsio 3510 3591 0 0 3 0x14280 nfsidl nfsio 7260 54771 0 0 3 0x14280 nfsidl nfsio 7379 203692 0 0 3 0x14280 nfsidl nfsio 23420 416312 0 0 3 0x14280 nfsidl nfsio 75856 417417 0 0 3 0x14280 nfsidl nfsio 64193 14092 0 0 3 0x14280 nfsidl nfsio 67134 418900 0 0 3 0x14280 nfsidl nfsio 98782 425398 0 0 3 0x14200 bored sosplice 83311 213000 85211 0 3 0x82 nanoslp syz-fuzzer 83311 38374 85211 0 3 0x4000082 nanoslp syz-fuzzer 83311 225576 85211 0 3 0x4000082 thrsleep syz-fuzzer 83311 28266 85211 0 3 0x4000082 thrsleep syz-fuzzer 83311 171767 85211 0 3 0x4000082 thrsleep syz-fuzzer 83311 185356 85211 0 3 0x4000082 thrsleep syz-fuzzer 83311 389762 85211 0 3 0x4000082 thrsleep syz-fuzzer 83311 356861 85211 0 3 0x4000082 kqread syz-fuzzer 85211 375784 32334 0 3 0x10008a sigsusp ksh 32334 441938 97149 0 3 0x9a poll sshd 31070 334586 1 0 3 0x100083 ttyin getty 97149 112696 1 0 3 0x88 poll sshd 67185 459598 27653 74 3 0x100092 bpf pflogd 27653 463548 1 0 3 0x80 netio pflogd 4613 57693 65623 73 3 0x100090 kqread syslogd 65623 340500 1 0 3 0x100082 netio syslogd 36001 492343 1 0 3 0x100080 kqread resolvd 5409 215173 88458 77 3 0x100092 kqread dhcpleased 48676 113299 88458 77 3 0x100092 kqread dhcpleased 88458 137632 1 0 3 0x80 kqread dhcpleased 10802 20912 0 0 3 0x14200 bored smr 27946 238789 0 0 2 0x14200 zerothread 20578 353236 0 0 3 0x14200 aiodoned aiodoned 72221 15282 0 0 3 0x14200 syncer update 49435 306068 0 0 3 0x14200 cleaner cleaner 16375 188044 0 0 2 0x14200 reaper 26262 217972 0 0 3 0x14200 pgdaemon pagedaemon 2512 277429 0 0 3 0x14200 bored viomb 4857 505069 0 0 3 0x40014200 acpi0 acpi0 36554 360470 0 0 3 0x40014200 idle1 36728 193565 0 0 3 0x14200 bored softnet 63170 177358 0 0 3 0x14200 bored systqmp 78633 262054 0 0 3 0x14200 bored systq 65227 338691 0 0 3 0x40014200 bored softclock 43942 438953 0 0 3 0x40014200 idle0 1 378589 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 79468 (syz-executor.0) thread 0xffff800022c92d20 (61996) exclusive rwlock amaplk r = 0 (0xfffffd8078624478) #0 witness_lock+0x44d #1 uvm_fault_check+0x3ca sys/uvm/uvm_fault.c:776 #2 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #3 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #4 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd807c59e028) #0 witness_lock+0x44d #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1746 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:676 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #5 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #6 recall_trap+0x8 Process 76965 (syz-executor.2) thread 0xffff800022c75a50 (15674) exclusive rrwlock inode r = 0 (0xfffffd807ea50a28) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347 #6 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #8 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 #9 domkdirat+0x121 sys/kern/vfs_syscalls.c:3100 #10 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #10 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806f90fe78) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3085 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 Process 16375 (reaper) thread 0xffff8000211497a0 (188044) exclusive rwlock kmmaplk r = 0 (0xffffffff8298b1a0) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5458 #3 uvm_unmap+0x78 sys/uvm/uvm_map.c:2068 #4 uvm_uarea_free+0x35 sys/uvm/uvm_glue.c:287 #5 reaper+0x158 sys/kern/kern_exit.c:451 #6 proc_trampoline+0x1c ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10205 6503K 7424K 78643K 44716 0 pcb 13 16K 19K 78643K 1225 0 rtable 154 20K 20K 78643K 2928 0 ifaddr 75 18K 20K 78643K 848 0 sysctl 3 1K 1K 78643K 3 0 counters 48 34K 35K 78643K 224 0 ioctlops 0 0K 8K 78643K 3025 0 iov 0 0K 16K 78643K 739 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1587 100K 100K 78643K 11414 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 3 5K 9K 78643K 60 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1923 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 49K 78643K 8019 0 sigio 0 0K 0K 78643K 54 0 proc 76 111K 112K 78643K 1317 0 subproc 52 3K 3K 78643K 403 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 456 0 in_multi 44 2K 3K 78643K 592 0 ether_multi 1 0K 0K 78643K 76 0 mrt 0 0K 0K 78643K 8 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 229 1023K 1023K 78643K 229 0 exec 0 0K 2K 78643K 2177 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 7 26K 26K 78643K 7 0 UVM amap 357 255K 270K 78643K 102837 0 UVM aobj 131 8K 8K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 448 0 NDP 9 0K 1K 78643K 173 0 temp 109 4214K 4298K 78643K 80653 0 kqueue 10 14K 26K 78643K 239 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 120 442 0 439 6 5 1 3 0 8 0 rtentry 112 442 0 394 3 1 2 3 0 8 0 unpcb 136 4909 0 4894 51 50 1 9 0 8 0 syncache 296 34 0 34 9 9 0 1 0 8 0 tcpqe 32 127 0 127 3 3 0 1 0 8 0 tcpcb 736 2124 0 2117 73 71 2 11 0 8 1 arp 120 70 0 62 1 0 1 1 0 8 0 inpcb 304 7313 0 7306 97 96 1 11 0 8 0 rttmr 72 6 0 6 2 2 0 1 0 8 0 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 6 0 6 1 1 0 1 0 8 0 nd6 48 113 0 104 1 0 1 1 0 8 0 pkpcb 40 18 0 18 5 5 0 1 0 8 0 kcovpl 48 31 0 27 1 0 1 1 0 8 0 ppxss 1248 21 0 21 5 4 1 1 0 8 1 pfstscr 40 87 0 87 5 5 0 1 0 8 0 pffrag 232 26 0 24 5 4 1 1 0 482 0 pffrnode 88 26 0 24 5 4 1 1 0 8 0 pffrent 40 516 0 514 5 4 1 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 pfrktable 1344 722 0 707 10 8 2 2 0 8 0 pftag 88 87 0 81 1 0 1 1 0 8 0 pfqueue 264 12 0 11 2 1 1 1 0 8 0 pfstitem 24 68 0 65 1 0 1 1 0 8 0 pfstkey 112 248 0 245 1 0 1 1 0 8 0 pfstate 320 154 0 151 3 2 1 3 0 8 0 pfsrctr 152 32 0 32 2 2 0 1 0 8 0 pfrule 1360 879 0 825 7 2 5 5 0 8 0 art_heap8 4096 2 0 1 2 1 1 2 0 8 0 art_heap4 256 1947 0 1719 21 5 16 19 0 8 0 art_table 32 1949 0 1720 3 0 3 3 0 8 0 art_node 16 441 0 401 1 0 1 1 0 8 0 sysvmsgpl 40 112 0 72 2 1 1 1 0 8 0 semapl 112 1917 0 1907 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 11363 0 9925 91 0 91 91 0 8 0 ffsino 272 11363 0 9925 97 0 97 97 0 8 0 nchpl 144 21540 0 19943 61 0 61 61 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 77633 0 77632 3 2 1 1 0 8 0 percpumem 16 124 0 88 1 0 1 1 0 8 0 vcpupl 2048 16 0 0 2 0 2 2 0 8 0 vmpool 560 64 0 48 2 0 2 2 0 8 0 pfiaddrpl 120 194 0 171 1 0 1 1 0 8 0 scsiplug 72 4 0 4 2 2 0 1 0 8 0 scxspl 216 66806 0 66806 18 17 1 8 0 8 1 plimitpl 152 545 0 534 1 0 1 1 0 8 0 sigapl 424 8197 0 8141 7 0 7 7 0 8 0 futexpl 64 65452 0 65452 4 3 1 1 0 8 1 knotepl 112 145 0 0 3 0 3 3 0 8 0 kqueuepl 216 1147 0 1138 25 22 3 4 0 8 1 pipepl 336 1417 0 1401 39 37 2 7 0 8 0 fdescpl 496 8162 0 8142 4 1 3 4 0 8 0 filepl 152 53103 0 52952 98 87 11 16 0 8 5 lockfpl 104 2243 0 2241 6 5 1 4 0 8 0 lockfspl 48 782 0 780 2 1 1 2 0 8 0 sessionpl 144 47 0 34 1 0 1 1 0 8 0 pgrppl 48 57 0 44 1 0 1 1 0 8 0 ucredpl 96 6050 0 6038 1 0 1 1 0 8 0 zombiepl 144 8996 0 8995 1 0 1 1 0 8 0 processpl 1064 8198 0 8141 4 0 4 4 0 8 0 procpl 672 23570 0 23503 16 9 7 8 0 8 1 srpgc 96 30 0 30 6 6 0 1 0 8 0 sosppl 168 56 0 56 10 10 0 1 0 8 0 sockpl 480 12818 0 12793 229 225 4 34 0 8 0 mcl64k 65536 26 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 1 2 3 0 8 0 mcl12k 12288 25 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 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 12 0 0 1 0 1 1 0 8 0 mcl2k 2048 305 0 0 31 4 27 31 0 8 0 mtagpl 96 1050 0 0 23 0 23 23 0 8 0 mbufpl 256 2236 0 0 131 0 131 131 0 8 0 bufpl 288 17018 0 10674 454 0 454 454 0 8 0 anonpl 24 2353560 0 2335117 249 108 141 141 0 186 19 amapchunkpl 152 254487 0 253735 85 52 33 45 0 158 2 amappl16 200 23161 0 22566 136 91 45 45 0 8 13 amappl15 192 1912 0 1912 5 4 1 1 0 8 1 amappl14 184 778 0 776 3 2 1 1 0 8 0 amappl13 176 1003 0 1002 1 0 1 1 0 8 0 amappl12 168 168 0 164 1 0 1 1 0 8 0 amappl11 160 1082 0 1066 1 0 1 1 0 8 0 amappl10 152 2317 0 2306 1 0 1 1 0 8 0 amappl9 144 655 0 653 1 0 1 1 0 8 0 amappl8 136 1815 0 1741 3 0 3 3 0 8 0 amappl7 128 1047 0 1035 1 0 1 1 0 8 0 amappl6 120 504 0 485 1 0 1 1 0 8 0 amappl5 112 9948 0 9924 1 0 1 1 0 8 0 amappl4 104 2614 0 2589 1 0 1 1 0 8 0 amappl3 96 816 0 796 1 0 1 1 0 8 0 amappl2 88 1695 0 1652 4 3 1 2 0 8 0 amappl1 80 150235 0 149745 14 2 12 13 0 8 0 amappl 88 101896 0 101670 6 0 6 6 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 8226 0 8189 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 8226 0 8189 1 0 1 1 0 8 0 vmmpekpl 168 64798 0 64755 3 0 3 3 0 8 0 vmmpepl 168 755783 0 753655 274 162 112 120 0 357 8 vmsppl 368 8225 0 8189 4 0 4 4 0 8 0 rwobjpl 56 189083 0 181526 128 17 111 111 0 8 3 pdppl 4096 16460 0 16394 114 44 70 72 0 8 4 pvpl 32 3965777 0 3943426 385 164 221 249 0 265 29 pmappl 248 8225 0 8189 3 0 3 3 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 1087 0 169 27 0 27 27 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff827f3ff0) at x86_ipi_db+0x1a 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+0x23 __mp_lock(ffffffff82993700) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82993700) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff800027b3b010,ffff800000077500) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff82993700) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82993700) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x1f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x40 sys/dev/kcov.c:149 uvm_fault(fffffd807c59e010,41b8f6ca000,0,2) at uvm_fault+0x233 sys/uvm/uvm_fault.c:639 upageflttrap(ffff800027b3b4f0,41b8f6ca000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800027b3b4f0) at usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x41c06d34550, count: -14 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(ffff800000d04028,9,0) at witness_checkorder+0x138 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(ffff800000d04028,9,0) at witness_checkorder+0x138 sys/kern/subr_witness.c:772 rw_enter_write(ffff800000d04018) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 unveil_delete_names(ffff800000d04000) at unveil_delete_names+0x30 unvname_rbt_RBT_MIN sys/kern/kern_unveil.c:90 [inline] unveil_delete_names(ffff800000d04000) at unveil_delete_names+0x30 sys/kern/kern_unveil.c:100 unveil_destroy(ffff8000ffff90a8) at unveil_destroy+0xad sys/kern/kern_unveil.c:191 exit1(ffff800022c937a0,0,0,3) at exit1+0x3d5 sys/kern/kern_exit.c:225 single_thread_check_locked(ffff800022c937a0,0,0) at single_thread_check_locked+0x227 sys/kern/kern_sig.c:1958 userret(ffff800022c937a0) at userret+0x224 single_thread_check sys/kern/kern_sig.c:1999 [inline] userret(ffff800022c937a0) at userret+0x224 sys/kern/kern_sig.c:1946 syscall(ffff800027b235e0) at syscall+0x57e mi_syscall_return sys/sys/syscall_mi.h:129 [inline] syscall(ffff800027b235e0) at syscall+0x57e sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffcd3d0, count: -10