witness: lock order reversal: 1st 0xfffffd807effb018 vmmaplk (&map->lock) 2nd 0xfffffd8066c481a8 inode (&ip->i_lock) lock order "&ip->i_lock"(rrwlock) -> "&map->lock"(rwlock) first seen at: #0 witness_checkorder+0x65e witness_lock_order_add sys/kern/subr_witness.c:2463 [inline] #0 witness_checkorder+0x65e sys/kern/subr_witness.c:880 #1 rw_enter_read+0x66 sys/kern/kern_rwlock.c:111 #2 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1495 #3 uvm_fault_check+0x3d sys/uvm/uvm_fault.c:513 #4 uvm_fault+0xdb sys/uvm/uvm_fault.c:694 #5 kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 #6 kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 #7 alltraps_kern_meltdown+0x7b #8 copyout+0x53 #9 ffs_read+0x3e2 sys/ufs/ffs/ffs_vnops.c:258 #10 VOP_READ+0xbf sys/kern/vfs_vops.c:253 #11 vn_rdwr+0x10b #12 vmcmd_map_readvn+0xda sys/kern/exec_subr.c:246 #13 exec_process_vmcmds+0xb2 sys/kern/exec_subr.c:143 #14 sys_execve+0x9ff sys/kern/kern_exec.c:461 #15 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #15 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 #16 Xsyscall+0x128 lock order "&map->lock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at: #0 witness_checkorder+0x65e witness_lock_order_add sys/kern/subr_witness.c:2463 [inline] #0 witness_checkorder+0x65e sys/kern/subr_witness.c:880 #1 rw_enter+0xd4 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 #4 vn_lock+0x6c sys/kern/vfs_vnops.c:575 #5 uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1201 #6 uvn_get+0x236 sys/uvm/uvm_vnode.c:1061 #7 uvm_fault+0xa41 sys/uvm/uvm_fault.c:1073 #8 uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1342 #9 uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 #10 sys_mlock+0x180 sys/uvm/uvm_mmap.c:772 #11 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #11 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 #12 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:398 witness_checkorder(fffffd8066c481a8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd8066c481a8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd8066c48198,81) at rw_enter+0xd4 rrw_enter(fffffd8066c48198,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd8069dc7358,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd8069dc7358,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd8069e588b8,ffff8000212be428,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1201 uvn_get(fffffd8069e588b8,0,ffff8000212be688,ffff8000212be624,0,1) at uvn_get+0x236 sys/uvm/uvm_vnode.c:1061 uvm_fault(fffffd807effb000,20002000,2,1) at uvm_fault+0xa41 sys/uvm/uvm_fault.c:1073 uvm_fault_wire(fffffd807effb000,20002000,20003000,1) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1342 uvm_map_pageable_wire(fffffd807effb000,fffffd806a5389f8,fffffd806a10faf0,116,0,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlock(ffff8000ffff4018,ffff8000212be868,ffff8000212be8b0) at sys_mlock+0x180 sys/uvm/uvm_mmap.c:772 syscall(ffff8000212be930) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212be930) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5068760d9d0, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff8000212be080 rbx 0x3 rdx 0xffff800000aee240 rcx 0x3 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffffffff81e329a3 witness_checkorder+0xf33 r9 0x5 r10 0x4c68441440a39b67 r11 0x1e4e43480c22782a r12 0xffffffff82876960 w_lodata+0x542d0 r13 0 r14 0xffffffff82868050 w_lodata+0x459c0 r15 0xfffffd8002c9a500 rip 0xffffffff817c4578 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000212be070 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=355169 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff59b8,0xffff8000ffff4cf8 process=0xffff8000ffff2118 user=0xffff8000212b9000, vmspace=0xfffffd807effb000 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 27735 434329 53637 32767 7 0x10 syz-executor.0 *27735 355169 53637 32767 7 0x4000010 syz-executor.0 27735 163079 53637 32767 3 0x4000090 fsleep syz-executor.0 53637 98102 18820 32767 3 0x90 nanosleep syz-executor.0 18820 50478 2777 0 3 0x82 wait syz-executor.0 6540 363285 0 0 3 0x14200 bored sosplice 90863 251209 7249 32767 3 0x10 biowait syz-executor.1 7249 267171 2777 0 3 0x82 wait syz-executor.1 2777 440646 15820 0 3 0x82 thrsleep syz-fuzzer 2777 37113 15820 0 3 0x4000082 nanosleep syz-fuzzer 2777 249593 15820 0 3 0x4000082 kqread syz-fuzzer 2777 134379 15820 0 3 0x4000082 thrsleep syz-fuzzer 2777 19173 15820 0 3 0x4000082 thrsleep syz-fuzzer 2777 490601 15820 0 3 0x4000082 thrsleep syz-fuzzer 2777 338757 15820 0 3 0x4000082 thrsleep syz-fuzzer 2777 196100 15820 0 3 0x4000082 thrsleep syz-fuzzer 15820 476811 67215 0 3 0x10008a pause ksh 67215 385076 39241 0 3 0x92 select sshd 23576 359830 1 0 3 0x100083 ttyin getty 39241 232818 1 0 3 0x80 select sshd 82433 168931 67671 73 3 0x100090 kqread syslogd 67671 278218 1 0 3 0x100082 netio syslogd 59519 242277 1 77 3 0x100090 poll dhclient 2840 72755 1 0 3 0x80 poll dhclient 67768 8692 0 0 3 0x14200 bored smr 80614 462261 0 0 2 0x14200 zerothread 55785 356906 0 0 3 0x14200 aiodoned aiodoned 35676 322637 0 0 3 0x14200 syncer update 21475 517734 0 0 3 0x14200 cleaner cleaner 83117 38285 0 0 3 0x14200 reaper reaper 34972 144646 0 0 3 0x14200 pgdaemon pagedaemon 74954 314704 0 0 3 0x14200 bored crynlk 98886 253606 0 0 3 0x14200 bored crypto 91760 403617 0 0 3 0x14200 bored viomb 28228 202236 0 0 3 0x40014200 acpi0 acpi0 5420 412952 0 0 3 0x40014200 idle1 75073 245173 0 0 3 0x14200 bored softnet 61841 109365 0 0 3 0x14200 bored systqmp 70412 154126 0 0 3 0x14200 bored systq 76213 408021 0 0 3 0x40014200 bored softclock 52913 66446 0 0 3 0x40014200 idle0 1 319808 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 27735 (syz-executor.0) thread 0xffff8000ffff4018 (355169) shared rwlock vmmaplk r = 0 (0xfffffd807effb018) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164 #1 rw_enter+0x446 sys/kern/kern_rwlock.c:311 #2 vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5463 #3 uvm_map_pageable+0x120 sys/uvm/uvm_map.c:2463 #4 sys_mlock+0x180 sys/uvm/uvm_mmap.c:772 #5 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828f0048) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164 #1 syscall+0x3fd mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x3fd sys/arch/amd64/amd64/trap.c:590 #2 Xsyscall+0x128 Process 90863 (syz-executor.1) thread 0xffff8000ffff5498 (251209) exclusive rrwlock inode r = 0 (0xfffffd8066c48808) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164 #1 rw_enter+0x446 sys/kern/kern_rwlock.c:311 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 #4 vn_lock+0x6c sys/kern/vfs_vnops.c:575 #5 vget+0x1c6 sys/kern/vfs_subr.c:671 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x6b sys/ufs/ffs/ffs_vfsops.c:1321 #8 ufs_lookup+0x151d sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90 #10 vfs_lookup+0x708 sys/kern/vfs_lookup.c:568 #11 namei+0x5f7 sys/kern/vfs_lookup.c:249 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1848 #13 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8066c48b38) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164 #1 rw_enter+0x446 sys/kern/kern_rwlock.c:311 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 #4 vn_lock+0x6c sys/kern/vfs_vnops.c:575 #5 vget+0x1c6 sys/kern/vfs_subr.c:671 #6 cache_lookup+0x2b4 sys/kern/vfs_cache.c:224 #7 ufs_lookup+0x1c0 sys/ufs/ufs/ufs_lookup.c:162 #8 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90 #9 vfs_lookup+0x708 sys/kern/vfs_lookup.c:568 #10 namei+0x5f7 sys/kern/vfs_lookup.c:249 #11 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1848 #12 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #12 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 #13 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9480 6349K 6349K 78643K 10577 0 pcb 13 8K 8K 78643K 13 0 rtable 109 3K 3K 78643K 305 0 ifaddr 39 10K 10K 78643K 53 0 sysctl 3 1K 1K 78643K 3 0 counters 43 33K 33K 78643K 47 0 ioctlops 0 0K 2K 78643K 40 0 iov 0 0K 24K 78643K 124 0 mount 1 1K 1K 78643K 1 0 vnodes 1216 76K 77K 78643K 1360 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 9 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 891 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1825 197K 290K 78643K 13109 0 file desc 7 21K 33K 78643K 3097 0 sigio 0 0K 0K 78643K 11 0 proc 48 50K 74K 78643K 553 0 subproc 34 2K 2K 78643K 68 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 274 0 in_multi 33 2K 2K 78643K 101 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 463 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 162 38K 57K 78643K 8272 0 UVM aobj 18 2K 2K 78643K 31 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 86 0 NDP 5 0K 0K 78643K 15 0 temp 101 3961K 4029K 78643K 8347 0 kqueue 3 4K 16K 78643K 187 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 arp 64 10 0 4 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 120 60 0 58 1 0 1 1 0 8 0 rtentry 112 70 0 24 2 0 2 2 0 8 0 unpcb 120 1039 0 1031 1 0 1 1 0 8 0 syncache 296 20 0 20 4 4 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 774 0 763 19 16 3 7 0 8 1 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 5 0 5 1 1 0 1 0 8 0 inpcb 296 1712 0 1703 9 7 2 2 0 8 1 ip6q 72 3 0 3 1 1 0 1 0 8 0 ip6af 40 5 0 5 1 1 0 1 0 8 0 nd6 48 15 0 7 1 0 1 1 0 8 0 kcovpl 48 4 0 2 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 309 0 103 14 1 13 14 0 8 0 art_table 32 310 0 103 2 0 2 2 0 8 0 art_node 16 69 0 27 1 0 1 1 0 8 0 sysvmsgpl 40 72 0 34 1 0 1 1 0 8 0 semapl 112 889 0 879 1 0 1 1 0 8 0 shmpl 112 28 0 13 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 5026 0 3628 88 0 88 88 0 8 0 ffsino 272 5026 0 3628 94 0 94 94 0 8 0 nchpl 144 9087 0 7495 60 0 60 60 0 8 0 uvmvnodes 72 5103 0 0 93 0 93 93 0 8 0 vnodes 208 5103 0 0 269 0 269 269 0 8 0 namei 1024 23052 0 23052 1 0 1 1 0 8 1 percpumem 16 34 0 2 1 0 1 1 0 8 0 scxspl 216 26393 0 26392 7 6 1 6 0 8 0 plimitpl 152 264 0 255 1 0 1 1 0 8 0 sigapl 424 3280 0 3247 4 0 4 4 0 8 0 futexpl 56 30506 0 30505 1 0 1 1 0 8 0 knotepl 112 310 0 290 1 0 1 1 0 8 0 kqueuepl 152 2118 0 2116 1 0 1 1 0 8 0 pipepl 304 308 0 297 7 5 2 2 0 8 1 fdescpl 496 3263 0 3247 3 0 3 3 0 8 0 filepl 152 13330 0 13223 8 3 5 7 0 8 0 lockfpl 104 722 0 721 1 0 1 1 0 8 0 lockfspl 48 205 0 204 1 0 1 1 0 8 0 sessionpl 144 19 0 9 1 0 1 1 0 8 0 pgrppl 48 28 0 18 1 0 1 1 0 8 0 ucredpl 96 2406 0 2397 1 0 1 1 0 8 0 zombiepl 144 3247 0 3247 1 0 1 1 0 8 1 processpl 1056 3280 0 3247 4 1 3 3 0 8 0 procpl 656 7260 0 7218 6 2 4 5 0 8 0 sosppl 168 80 0 80 5 5 0 1 0 8 0 sockpl 400 2915 0 2896 9 6 3 4 0 8 0 mcl64k 65536 9 0 0 2 0 2 2 0 8 0 mcl12k 12288 20 0 0 2 0 2 2 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 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 mcl2k 2048 223 0 0 16 0 16 16 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 513 0 0 26 0 26 26 0 8 0 bufpl 280 7218 0 973 447 0 447 447 0 8 0 anonpl 16 353016 0 342454 111 60 51 62 0 124 6 amapchunkpl 152 18086 0 17717 44 24 20 31 0 158 3 amappl16 192 13165 0 12887 74 58 16 34 0 8 1 amappl15 184 3 0 2 1 0 1 1 0 8 0 amappl14 176 26 0 18 1 0 1 1 0 8 0 amappl13 168 1586 0 1583 1 0 1 1 0 8 0 amappl12 160 22 0 17 1 0 1 1 0 8 0 amappl11 152 48 0 39 1 0 1 1 0 8 0 amappl10 144 203 0 198 1 0 1 1 0 8 0 amappl9 136 1682 0 1680 1 0 1 1 0 8 0 amappl8 128 302 0 211 4 1 3 3 0 8 0 amappl7 120 1546 0 1539 1 0 1 1 0 8 0 amappl6 112 269 0 249 1 0 1 1 0 8 0 amappl5 104 3485 0 3468 1 0 1 1 0 8 0 amappl4 96 270 0 238 1 0 1 1 0 8 0 amappl3 88 1756 0 1747 1 0 1 1 0 8 0 amappl2 80 22242 0 22174 2 0 2 2 0 8 0 amappl1 72 111507 0 111013 25 15 10 18 0 8 0 amappl 80 7623 0 7553 2 0 2 2 0 84 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 64 30 0 13 1 0 1 1 0 8 0 uaddrrnd 24 3263 0 3247 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3263 0 3247 1 0 1 1 0 8 0 vmmpekpl 168 22031 0 22002 2 0 2 2 0 8 0 vmmpepl 168 436297 0 434621 133 53 80 96 0 357 1 vmsppl 368 3262 0 3247 2 0 2 2 0 8 0 pdppl 4096 6533 0 6494 6 0 6 6 0 8 0 pvpl 32 1212586 0 1198279 286 149 137 155 0 265 17 pmappl 232 3262 0 3247 2 1 1 2 0 8 0 extentpl 40 57 0 39 1 0 1 1 0 8 0 phpool 112 290 0 25 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff826ddff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x3e kd_curproc sys/dev/kcov.c:571 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x3e sys/dev/kcov.c:143 __mp_lock(ffffffff828efe40) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828efe40) at __mp_lock+0x133 sys/kern/kern_lock.c:147 intr_handler(ffff8000257100b0,ffff80000065a300) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge4_untramp() at Xintr_ioapic_edge4_untramp+0x19f __mp_lock(ffffffff828efe40) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828efe40) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff800025710200,ffff80000006ba00) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge17_untramp() at Xintr_ioapic_edge17_untramp+0x19f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x37 kd_curproc sys/dev/kcov.c:570 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x37 sys/dev/kcov.c:143 userret(ffff8000ffff59b8) at userret+0x30b sys/kern/kern_sig.c:1927 syscall(ffff8000257103e0) at syscall+0x55c mi_syscall_return sys/sys/syscall_mi.h:129 [inline] syscall(ffff8000257103e0) at syscall+0x55c sys/arch/amd64/amd64/trap.c:612 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffdff20, 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:398 witness_checkorder(fffffd8066c481a8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd8066c481a8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd8066c48198,81) at rw_enter+0xd4 rrw_enter(fffffd8066c48198,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd8069dc7358,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd8069dc7358,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd8069e588b8,ffff8000212be428,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1201 uvn_get(fffffd8069e588b8,0,ffff8000212be688,ffff8000212be624,0,1) at uvn_get+0x236 sys/uvm/uvm_vnode.c:1061 uvm_fault(fffffd807effb000,20002000,2,1) at uvm_fault+0xa41 sys/uvm/uvm_fault.c:1073 uvm_fault_wire(fffffd807effb000,20002000,20003000,1) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1342 uvm_map_pageable_wire(fffffd807effb000,fffffd806a5389f8,fffffd806a10faf0,116,0,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlock(ffff8000ffff4018,ffff8000212be868,ffff8000212be8b0) at sys_mlock+0x180 sys/uvm/uvm_mmap.c:772 syscall(ffff8000212be930) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212be930) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5068760d9d0, count: -14