login: witness: lock order reversal: 1st 0xfffffd8069ffcd20 vmmaplk (&map->lock) 2nd 0xfffffd8066fee250 fdlock (&newfdp->fd_fd.fd_lock) lock order "&newfdp->fd_fd.fd_lock"(rwlock) -> "&map->lock"(rwlock) first seen at: #0 rw_enter+0xd1 sys/kern/kern_rwlock.c:250 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #4 kpageflttrap+0x209 #5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x53 #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 lock order "&map->lock"(rwlock) -> "&newfdp->fd_fd.fd_lock"(rwlock) first seen at: #0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 #1 fill_file+0xad2 sys/kern/kern_sysctl.c:1304 #2 sysctl_file+0xe77 sys/kern/kern_sysctl.c:1428 #3 kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 #4 sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 #5 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #6 Xsyscall+0x128 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(fffffd8066fee250,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8066fee250,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd8066fee240) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff800000c1dc00,fffffd80685e6e40,fffffd8066fee1f8,0,0,ffff800029312160,7e7c062535dd9ec2,ff09,ffff8000270bcd30) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff80002e3cd228,4,20000080,ffff80002e3cd258,ffff8000270bcd30) at sysctl_file+0xe77 sys/kern/kern_sysctl.c:1428 kern_sysctl(ffff80002e3cd224,5,20000080,ffff80002e3cd258,0,0,2d0862db81831e0b) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff8000270bcd30,ffff80002e3cd2c8,ffff80002e3cd320) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff80002e3cd390) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e3cd390) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa483b919df0, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff80002e3ccb90 rbx 0x3 rdx 0xffff800000bdc800 rcx 0 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffff80002e3ccb00 r9 0x8080808080808080 r10 0xe5279f53221bed9d r11 0x238c8a716a2c032c r12 0xffffffff82aacde0 w_lodata+0x4f470 r13 0 r14 0xffffffff82aa8190 w_lodata+0x4a820 r15 0xfffffd8002f62c80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e3ccb80 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.7) pid=497547 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff8000278d5ce0,0xffffffff82b3d400 process=0xffff800029313628 user=0xffff80002e3c8000, vmspace=0xfffffd8069ffcd08 estcpu=30, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 41134 353465 14974 32767 2 0x10 syz-executor.6 41134 411282 14974 32767 3 0x4000090 netio syz-executor.6 41134 42094 14974 32767 3 0x4000090 fsleep syz-executor.6 74501 323045 83377 32767 3 0x90 nanoslp syz-executor.0 74501 84627 83377 32767 3 0x4000090 fsleep syz-executor.0 74501 153442 83377 32767 3 0x4000090 kqsel syz-executor.0 96574 504323 35133 32767 2 0x10 syz-executor.2 49778 448442 81197 32767 2 0x10 syz-executor.4 49778 373136 81197 32767 3 0x4000090 fsleep syz-executor.4 49778 194293 81197 32767 3 0x4000090 fsleep syz-executor.4 49778 62736 81197 32767 3 0x4000090 fsleep syz-executor.4 88374 367134 87336 32767 3 0x90 nanoslp syz-executor.1 88374 177424 87336 32767 3 0x4000090 netio syz-executor.1 88374 9165 87336 32767 3 0x4000090 fsleep syz-executor.1 88374 83269 87336 32767 3 0x4000090 fsleep syz-executor.1 76051 516485 72263 32767 2 0x10 syz-executor.7 *76051 497547 72263 32767 7 0x4000010 syz-executor.7 38329 301724 0 0 3 0x14200 bored sosplice 72263 117729 93134 32767 3 0x90 nanoslp syz-executor.7 14974 252420 30492 32767 3 0x90 nanoslp syz-executor.6 93134 239971 42388 0 3 0x82 wait syz-executor.7 30045 507593 97984 32767 3 0x10 biowait syz-executor.3 81197 168461 32093 32767 3 0x90 nanoslp syz-executor.4 32093 134098 42388 0 3 0x82 wait syz-executor.4 81969 271209 29300 32767 3 0x90 nanoslp syz-executor.5 35133 422316 28487 32767 2 0x10 syz-executor.2 30492 264569 42388 0 3 0x82 wait syz-executor.6 29300 520850 42388 0 3 0x82 wait syz-executor.5 28487 485868 42388 0 3 0x82 wait syz-executor.2 97984 408051 42388 0 3 0x82 wait syz-executor.3 83377 190399 11678 32767 3 0x90 nanoslp syz-executor.0 87336 200168 10942 32767 3 0x90 nanoslp syz-executor.1 10942 416801 42388 0 3 0x82 wait syz-executor.1 11678 112822 42388 0 3 0x82 wait syz-executor.0 42388 359198 83645 0 3 0x82 thrsleep syz-fuzzer 42388 462958 83645 0 3 0x4000082 nanoslp syz-fuzzer 42388 284815 83645 0 3 0x4000082 thrsleep syz-fuzzer 42388 264783 83645 0 3 0x4000082 thrsleep syz-fuzzer 42388 456231 83645 0 3 0x4000082 nanoslp syz-fuzzer 42388 48677 83645 0 3 0x4000082 thrsleep syz-fuzzer 42388 40160 83645 0 3 0x4000082 thrsleep syz-fuzzer 42388 126289 83645 0 3 0x4000082 thrsleep syz-fuzzer 42388 464245 83645 0 3 0x4000082 kqread syz-fuzzer 83645 49855 22461 0 3 0x10008a sigsusp ksh 22461 521590 14778 0 3 0x9a kqread sshd 73167 331353 1 0 3 0x100083 ttyin getty 14778 33053 1 0 3 0x88 kqread sshd 40715 357866 61424 73 3 0x1100090 kqread syslogd 61424 100645 1 0 3 0x100082 netio syslogd 28948 145925 1 0 3 0x100080 kqread resolvd 5285 403642 71963 77 3 0x100092 kqread dhcpleased 82535 464387 71963 77 3 0x100092 kqread dhcpleased 71963 445831 1 0 3 0x80 kqread dhcpleased 1360 512570 0 0 3 0x14200 bored smr 82132 264996 0 0 2 0x14200 zerothread 62770 219915 0 0 3 0x14200 aiodoned aiodoned 74013 173589 0 0 3 0x14200 syncer update 25798 184377 0 0 3 0x14200 cleaner cleaner 2870 311135 0 0 7 0x14200 reaper 54783 146998 0 0 3 0x14200 pgdaemon pagedaemon 17690 294120 0 0 3 0x14200 bored viomb 20513 274417 0 0 3 0x40014200 acpi0 acpi0 61896 389481 0 0 3 0x40014200 idle1 39542 376599 0 0 3 0x14200 bored softnet 68232 375579 0 0 3 0x14200 bored systqmp 1806 445721 0 0 3 0x14200 bored systq 17728 163176 0 0 3 0x40014200 bored softclock 52671 409836 0 0 3 0x40014200 idle0 1 190583 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 76051 (syz-executor.7) thread 0xffff8000270bcd30 (497547) shared rwlock vmmaplk r = 0 (0xfffffd8069ffcd20) #0 witness_lock+0x44d #1 uvm_vslock+0xc8 sys/uvm/uvm_glue.c:129 #2 sys_sysctl+0x2d8 sys/kern/kern_sysctl.c:240 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 exclusive rwlock sysctllk r = 0 (0xffffffff82941f10) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 sys_sysctl+0x1b3 sys/kern/kern_sysctl.c:233 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829de988) #0 witness_lock+0x44d #1 syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 #2 Xsyscall+0x128 Process 30045 (syz-executor.3) thread 0xffff800023c47268 (507593) exclusive rrwlock inode r = 0 (0xfffffd806e717810) #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:3101 #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 (0xfffffd8068f936f8) #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:3086 #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 2870 (reaper) thread 0xffff8000210f9260 (311135) exclusive rwlock amaplk r = 0 (0xfffffd807822a080) #0 witness_lock+0x44d #1 amap_unref+0x2b sys/uvm/uvm_amap.c:1365 #2 uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1599 #3 uvm_map_teardown+0x262 sys/uvm/uvm_map.c:2789 #4 uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685 #5 reaper+0x18b sys/kern/kern_exit.c:457 #6 proc_trampoline+0x1c ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10173 6407K 6419K 78643K 11263 0 pcb 13 12K 14K 78643K 17 0 rtable 242 7K 7K 78643K 363 0 ifaddr 81 16K 16K 78643K 82 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 2K 78643K 38 0 iov 0 0K 12K 78643K 139 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1270 79K 79K 78643K 1318 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 10 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 120 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 24 89K 125K 78643K 879 0 sigio 0 0K 0K 78643K 5 0 proc 56 74K 111K 78643K 514 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 137 0 in_multi 99 6K 6K 78643K 99 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 2K 78643K 672 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 331 81K 82K 78643K 12443 0 UVM aobj 7 6K 6K 78643K 7 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 15 0 NDP 11 0K 2K 78643K 27 0 temp 108 4699K 4762K 78643K 5732 0 kqueue 13 20K 24K 78643K 62 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 39 0 36 1 0 1 1 0 8 0 rtentry 112 114 0 2 4 0 4 4 0 8 0 unpcb 136 400 0 387 5 4 1 5 0 8 0 syncache 296 12 0 12 2 2 0 1 0 8 0 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 736 414 0 407 25 23 2 25 0 8 0 arp 120 18 0 0 1 0 1 1 0 8 0 inpcb 304 1337 0 1320 19 10 9 12 0 8 7 nd6 48 27 0 1 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 458 0 2 29 0 29 29 0 8 0 art_table 32 459 0 2 4 0 4 4 0 8 0 art_node 16 113 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 26 0 25 1 0 1 1 0 8 0 semapl 112 118 0 108 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2387 0 954 90 0 90 90 0 8 0 ffsino 272 2387 0 954 96 0 96 96 0 8 0 nchpl 144 3583 0 1921 62 0 62 62 0 8 0 uvmvnodes 80 2500 0 0 52 0 52 52 0 8 0 vnodes 224 2500 0 0 148 0 148 148 0 8 0 namei 1024 11612 0 11611 2 1 1 2 0 8 0 percpumem 16 40 0 0 1 0 1 1 0 8 0 scxspl 216 10988 0 10987 10 9 1 8 0 8 0 plimitpl 152 104 0 82 1 0 1 1 0 8 0 sigapl 424 1163 0 1112 7 0 7 7 0 8 0 futexpl 64 5587 0 5580 1 0 1 1 0 8 0 knotepl 120 156 0 0 5 0 5 5 0 8 0 kqueuepl 216 245 0 234 7 4 3 5 0 8 2 pipepl 336 202 0 174 3 0 3 3 0 8 0 fdescpl 496 1148 0 1113 7 2 5 6 0 8 0 filepl 152 5803 0 5556 19 5 14 15 0 8 4 lockfpl 104 152 0 149 1 0 1 1 0 8 0 lockfspl 48 57 0 54 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 29 0 13 1 0 1 1 0 8 0 ucredpl 96 496 0 478 1 0 1 1 0 8 0 zombiepl 144 1113 0 1112 1 0 1 1 0 8 0 processpl 1064 1163 0 1112 5 1 4 4 0 8 0 procpl 672 2518 0 2448 8 1 7 8 0 8 0 sosppl 168 7 0 6 2 1 1 1 0 8 0 sockpl 480 1792 0 1759 37 24 13 21 0 8 8 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 12 0 0 2 0 2 2 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 10 0 0 2 0 2 2 0 8 0 mcl4k 4096 9 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 154 0 0 19 0 19 19 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 465 0 0 29 0 29 29 0 8 0 bufpl 288 4796 0 142 333 0 333 333 0 8 0 anonpl 24 294876 0 280678 131 19 112 113 0 186 20 amapchunkpl 152 28955 0 28160 35 2 33 33 0 158 1 amappl16 200 3973 0 3575 50 19 31 34 0 8 8 amappl15 192 202 0 193 1 0 1 1 0 8 0 amappl14 184 1 0 1 1 1 0 1 0 8 0 amappl13 176 173 0 170 1 0 1 1 0 8 0 amappl12 168 14 0 12 1 0 1 1 0 8 0 amappl11 160 46 0 35 1 0 1 1 0 8 0 amappl10 152 331 0 323 1 0 1 1 0 8 0 amappl9 144 767 0 758 1 0 1 1 0 8 0 amappl8 136 582 0 531 2 0 2 2 0 8 0 amappl7 128 121 0 108 1 0 1 1 0 8 0 amappl6 120 485 0 456 2 1 1 2 0 8 0 amappl5 112 1244 0 1214 1 0 1 1 0 8 0 amappl4 104 799 0 777 2 1 1 2 0 8 0 amappl3 96 220 0 209 1 0 1 1 0 8 0 amappl2 88 649 0 605 3 1 2 3 0 8 0 amappl1 80 23234 0 22585 19 5 14 18 0 8 0 amappl 88 11996 0 11733 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 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1148 0 1113 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1148 0 1113 1 0 1 1 0 8 0 vmmpekpl 168 12486 0 12434 3 0 3 3 0 8 0 vmmpepl 168 107839 0 105148 142 12 130 130 0 357 10 vmsppl 368 1147 0 1112 4 0 4 4 0 8 0 rwobjpl 56 30218 0 26361 59 1 58 58 0 8 0 pdppl 4096 2303 0 2224 137 56 81 95 0 8 2 pvpl 32 599902 0 580650 244 39 205 244 0 265 43 pmappl 248 1147 0 1112 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 780 0 82 20 0 20 20 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff829baff0) 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(ffffffff829de780) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff8000211356e0,ffff800000077500) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff829de780) at __mp_lock+0x120 __mp_lock_spin sys/kern/kern_lock.c:117 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x120 sys/kern/kern_lock.c:147 intr_handler(ffff800021135830,ffff80000004ad00) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge21_untramp() at Xintr_ioapic_edge21_untramp+0x18f Xspllower() at Xspllower+0x19 amap_wipeout(fffffd806a7dd698) at amap_wipeout+0x1ff sys/uvm/uvm_amap.c:523 uvm_unmap_detach(ffff800021135a30,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1599 uvm_map_teardown(fffffd8069ffcb98) at uvm_map_teardown+0x262 sys/uvm/uvm_map.c:2789 uvmspace_free(fffffd8069ffcb98) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685 reaper(ffff8000210f9260) at reaper+0x18b sys/kern/kern_exit.c:457 end trace frame: 0x0, count: -15 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(fffffd8066fee250,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8066fee250,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd8066fee240) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff800000c1dc00,fffffd80685e6e40,fffffd8066fee1f8,0,0,ffff800029312160,7e7c062535dd9ec2,ff09,ffff8000270bcd30) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff80002e3cd228,4,20000080,ffff80002e3cd258,ffff8000270bcd30) at sysctl_file+0xe77 sys/kern/kern_sysctl.c:1428 kern_sysctl(ffff80002e3cd224,5,20000080,ffff80002e3cd258,0,0,2d0862db81831e0b) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff8000270bcd30,ffff80002e3cd2c8,ffff80002e3cd320) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff80002e3cd390) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e3cd390) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa483b919df0, count: -9