witness: lock order reversal: 1st 0xfffffd805e9cdbe8 vmmaplk (&map->lock) 2nd 0xfffffd806e150dd0 inode (&ip->i_lock) lock order [1] vmmaplk (&map->lock) -> [2] inode (&ip->i_lock) #0 rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 #1 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #2 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #3 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #4 vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 #5 vndstrategy+0x4ff sys/dev/vnd.c:342 #6 physio+0x2f6 sys/kern/kern_physio.c:162 #7 spec_read+0x155 sys/kern/spec_vnops.c:215 #8 VOP_READ+0x102 sys/kern/vfs_vops.c:227 #9 vn_read+0x17b sys/kern/vfs_vnops.c:369 #10 dofilereadv+0x230 sys/kern/sys_generic.c:252 #11 sys_readv+0xd8 sys/kern/sys_generic.c:199 #12 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 lock order [2] inode (&ip->i_lock) -> [1] vmmaplk (&map->lock) #0 rw_do_enter_read+0x9d sys/kern/kern_rwlock.c:352 #1 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1864 #2 uvm_fault_check+0x4b sys/uvm/uvm_fault.c:732 #3 uvm_fault+0x106 sys/uvm/uvm_fault.c:668 #4 kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:279 #5 kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x57 #8 ffs_read+0x422 sys/ufs/ffs/ffs_vnops.c:254 #9 VOP_READ+0x102 sys/kern/vfs_vops.c:227 #10 vn_rdwr+0x15b #11 vmcmd_map_readvn+0x142 sys/kern/exec_subr.c:249 #12 exec_process_vmcmds+0xfb sys/kern/exec_subr.c:139 #13 sys_execve+0xbd4 sys/kern/kern_exec.c:468 #14 start_init+0x3c6 sys/kern/init_main.c:716 #15 proc_trampoline+0x10 Stopped at db_enter+0x25: 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+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd806e150dd0,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806e150db8,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806e150db8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd8065b04368,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8065b04368,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_rdwr(0,fffffd8065b04368,ffff800011a26280,b6,0,1,980e4c726606cefa,0,ffff800000b2a000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd806502d148) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff828a4370,2902,8000,ffffffff8165bd70,ffff80003c5cf750) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff80003c5cf540) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd806def1b58,ffff80003c5cf750,0,fffffd807f7d37b8) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806fbf3d10,ffff80003c5cf750,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000ffffaa30,3,ffff80003c5cf750,0,ffff80003c5cf810) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff8000ffffaa30,ffff80003c5cf8c0,ffff80003c5cf810) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff80003c5cf8c0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5cf8c0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf477bab71d0, count: -16 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c5cf020 rbx 0xfffffd8004340580 rdx 0xffff8000012fc000 rcx 0xffff8000ffffaa30 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c5cef00 r9 0x8080808080808080 r10 0xc650d8a6a0a8919f r11 0x4a9afcf2c4c36582 r12 0 r13 0xfffffd8003b58f00 r14 0x3 r15 0xffffffff rip 0xffffffff8176dda5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c5cf010 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=61144 pid=21435 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c5a16f8,0xffffffff835dd0c0 process=0xffff80002a501da8 user=0xffff80003c5ca000, vmspace=0xfffffd805e9cdae8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 21435 233947 36203 0 7 0 syz-executor *21435 61144 36203 0 7 0x4000000 syz-executor 82581 185187 82940 0 2 0 syz-executor 82581 428512 82940 0 3 0x4000080 fsleep syz-executor 55040 309631 98655 0 2 0 syz-executor 55040 275163 98655 0 3 0x4000080 bell syz-executor 55040 327048 98655 0 2 0x4000000 syz-executor 128 123884 14207 -1 3 0x90 nanoslp syz-executor 128 503602 14207 -1 3 0x4000090 kqsel syz-executor 128 300290 14207 -1 3 0x4000090 fsleep syz-executor 94394 394571 25815 0 3 0x80 nanoslp syz-executor 94394 264133 25815 0 3 0x4000080 kqsel syz-executor 94394 406218 25815 0 3 0x4000080 kqsel syz-executor 94394 130948 25815 0 3 0x4000080 fsleep syz-executor 15533 128838 60627 0 3 0x80 nanoslp syz-executor 15533 353945 60627 0 3 0x4000080 netcon syz-executor 15533 325724 60627 0 3 0x4000080 fsleep syz-executor 15533 515355 60627 0 3 0x4000080 fsleep syz-executor 51363 411662 46668 0 3 0x80 nanoslp syz-executor 51363 63320 46668 0 3 0x4000080 ttyin syz-executor 51363 54631 46668 0 3 0x4000080 fsleep syz-executor 30024 32726 1 0 3 0x100083 ttyin getty 98655 288828 88673 0 3 0x82 nanoslp syz-executor 36203 292983 88673 0 3 0x82 nanoslp syz-executor 20447 422180 0 0 3 0x14200 acct acct 60627 93432 88673 0 3 0x82 nanoslp syz-executor 70773 179503 0 0 3 0x14280 nfsidl nfsio 11140 516997 0 0 3 0x14280 nfsidl nfsio 7783 167576 0 0 3 0x14280 nfsidl nfsio 70679 81803 0 0 3 0x14280 nfsidl nfsio 66148 187057 0 0 3 0x14280 nfsidl nfsio 43278 59180 0 0 3 0x14280 nfsidl nfsio 10237 386197 0 0 3 0x14280 nfsidl nfsio 81281 105436 0 0 3 0x14280 nfsidl nfsio 32473 443380 0 0 3 0x14280 nfsidl nfsio 82768 402170 0 0 3 0x14280 nfsidl nfsio 93406 22533 0 0 3 0x14280 nfsidl nfsio 63093 92226 0 0 3 0x14280 nfsidl nfsio 2275 464491 0 0 3 0x14280 nfsidl nfsio 33390 153385 0 0 3 0x14280 nfsidl nfsio 57672 23857 0 0 3 0x14280 nfsidl nfsio 92539 139618 0 0 3 0x14280 nfsidl nfsio 58897 81768 0 0 3 0x14280 nfsidl nfsio 28952 521675 0 0 3 0x14280 nfsidl nfsio 66992 77412 0 0 3 0x14280 nfsidl nfsio 88578 431068 0 0 3 0x14280 nfsidl nfsio 10589 462849 0 0 3 0x14200 bored sosplice 14207 273352 88673 0 3 0x82 nanoslp syz-executor 46668 299732 88673 0 3 0x82 nanoslp syz-executor 82940 306019 88673 0 3 0x82 nanoslp syz-executor 35715 481440 88673 0 3 0x82 nanoslp syz-executor 25815 487892 88673 0 3 0x82 nanoslp syz-executor 88673 498671 37572 0 3 0x82 kqread syz-executor 37572 337286 31171 0 3 0x10008a sigsusp ksh 31171 250308 36242 0 3 0x98 kqread sshd-session 36242 469514 72589 0 3 0x92 kqread sshd-session 72589 453677 1 0 3 0x88 kqread sshd 21433 306519 21551 74 3 0x1100092 bpf pflogd 21551 502920 1 0 3 0x80 sbwait pflogd 46955 242915 6855 73 3 0x1100090 kqread syslogd 6855 164792 1 0 3 0x100082 sbwait syslogd 60430 227222 1 0 3 0x100080 kqread resolvd 37815 308213 65995 77 3 0x100092 kqread dhcpleased 95758 489967 65995 77 3 0x100092 kqread dhcpleased 65995 230865 1 0 3 0x80 kqread dhcpleased 29619 318387 0 0 3 0x14200 bored smr 75350 239275 0 0 2 0x14200 zerothread 51107 170815 0 0 3 0x14200 aiodoned aiodoned 65480 519624 0 0 3 0x14200 syncer update 91961 477665 0 0 3 0x14200 cleaner cleaner 74395 484483 0 0 3 0x14200 reaper reaper 55962 450477 0 0 3 0x14200 pgdaemon pagedaemon 29274 375395 0 0 3 0x14200 bored viomb 95494 354438 0 0 3 0x40014200 acpi0 acpi0 44751 351121 0 0 3 0x40014200 idle1 8212 350548 0 0 3 0x14200 bored softnet3 16151 11318 0 0 3 0x14200 bored softnet2 53350 76815 0 0 3 0x14200 bored softnet1 48789 7260 0 0 2 0x14200 softnet0 54076 167379 0 0 3 0x14200 bored systqmp 75685 385812 0 0 3 0x14200 bored systq 57139 118814 0 0 3 0x14200 tmoslp softclockmp 98155 5603 0 0 3 0x40014200 tmoslp softclock 33468 94025 0 0 3 0x40014200 idle0 1 323847 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 21435 (syz-executor) thread 0xffff8000ffffaa30 (61144) shared rwlock vmmaplk r = 0 (0xfffffd805e9cdbe8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_read+0x3af sys/kern/kern_rwlock.c:405 #2 uvm_vslock_device+0x149 sys/uvm/uvm_glue.c:172 #3 physio+0x277 sys/kern/kern_physio.c:139 #4 spec_read+0x155 sys/kern/spec_vnops.c:215 #5 VOP_READ+0x102 sys/kern/vfs_vops.c:227 #6 vn_read+0x17b sys/kern/vfs_vnops.c:369 #7 dofilereadv+0x230 sys/kern/sys_generic.c:252 #8 sys_readv+0xd8 sys/kern/sys_generic.c:199 #9 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #10 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8356f038) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 vn_read+0x56 sys/kern/vfs_vnops.c:351 #2 dofilereadv+0x230 sys/kern/sys_generic.c:252 #3 sys_readv+0xd8 sys/kern/sys_generic.c:199 #4 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #5 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10241 11162K 11517K 166960K 14296 0 pcb 17 16K 17K 166960K 395 0 rtable 176 5K 7K 166960K 638 0 pf 33 17K 26K 166960K 128 0 ifaddr 37 6K 7K 166960K 100 0 ifgroup 51 2K 2K 166960K 150 0 sysctl 4 1K 1K 166960K 12 0 counters 62 36K 36K 166960K 120 0 ioctlops 0 0K 4K 166960K 1794 0 iov 0 0K 16K 166960K 125 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1419 89K 90K 166960K 3358 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 29 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 124 0 dirhash 12 2K 2K 166960K 45 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 93K 166960K 1953 0 sigio 0 0K 0K 166960K 34 0 proc 73 91K 140K 166960K 800 0 subproc 72 4K 4K 166960K 109 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 243 0 in_multi 81 6K 7K 166960K 248 0 ether_multi 1 0K 0K 166960K 25 0 mrt 1 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 735 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 253 74K 91K 166960K 19916 0 UVM aobj 131 8K 8K 166960K 135 0 pinsyscall 43 86K 108K 166960K 3144 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 139 0 NDP 11 0K 1K 166960K 72 0 temp 82 6900K 7024K 166960K 69211 0 kqueue 14 22K 32K 166960K 323 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 24 0 0 1 0 1 1 0 8 0 rtpcb 120 149 0 146 1 0 1 1 0 8 0 rtentry 112 198 0 120 4 0 4 4 0 8 0 unpcb 144 1542 0 1523 8 6 2 6 0 8 1 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 808 525 0 519 11 10 1 7 0 8 0 arp 120 37 0 20 1 0 1 1 0 8 0 inpcb 376 2039 0 2025 21 18 3 9 0 8 1 nd6 136 41 0 21 1 0 1 1 0 8 0 pkpcb 40 5 0 5 3 3 0 1 0 8 0 kcovpl 48 12 0 4 1 0 1 1 0 8 0 ppxss 1168 12 0 12 5 4 1 1 0 8 1 pffrag 232 10 0 6 1 0 1 1 0 482 0 pffrnode 88 10 0 6 1 0 1 1 0 8 0 pffrent 40 64 0 60 1 0 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 pfstitem 24 165 0 64 1 0 1 1 0 8 0 pfstkey 128 165 0 64 4 0 4 4 0 8 0 pfstate 376 165 0 64 11 0 11 11 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 785 0 440 33 8 25 29 0 8 1 art_table 32 787 0 440 4 0 4 4 0 8 0 art_node 16 189 0 120 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 12 1 0 1 1 0 8 0 semapl 112 119 0 109 1 0 1 1 0 8 0 shmpl 112 132 0 4 4 0 4 4 0 8 0 dirhash 1024 39 0 22 3 0 3 3 0 8 0 dino2pl 256 5134 0 3626 95 0 95 95 0 8 0 ffsino 280 5134 0 3626 109 0 109 109 0 8 0 nchpl 144 7893 0 7334 64 40 24 64 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 28495 0 28495 2 1 1 2 0 8 1 percpumem 16 74 0 29 1 0 1 1 0 8 0 kstatmem 264 80 0 58 2 0 2 2 0 8 0 scsiplug 72 9 0 9 5 4 1 1 0 8 1 scxspl 216 22759 0 22759 15 12 3 8 1 8 3 plimitpl 152 395 0 377 1 0 1 1 0 8 0 sigapl 424 2271 0 2199 11 2 9 9 0 8 0 futexpl 64 27599 0 27593 1 0 1 1 0 8 0 knotepl 120 583 0 0 17 0 17 17 0 8 0 kqueuepl 216 550 0 537 3 2 1 3 0 8 0 pipepl 328 340 0 313 6 3 3 6 0 8 0 fdescpl 504 2227 0 2195 5 0 5 5 0 8 0 filepl 152 15826 0 15597 26 11 15 17 0 8 3 lockfpl 104 951 0 947 2 1 1 2 0 8 0 lockfspl 48 313 0 309 1 0 1 1 0 8 0 sessionpl 144 28 0 19 1 0 1 1 0 8 0 pgrppl 48 52 0 35 1 0 1 1 0 8 0 ucredpl 104 3247 0 3232 1 0 1 1 0 8 0 zombiepl 144 2200 0 2199 1 0 1 1 0 8 0 processpl 1168 2271 0 2199 7 1 6 6 0 8 0 procpl 648 5288 0 5202 9 1 8 8 0 8 0 srpgc 96 14 0 14 5 5 0 1 0 8 0 sosppl 168 11 0 11 5 4 1 1 0 8 1 sockpl 688 3834 0 3800 31 26 5 15 0 8 1 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 126 0 0 16 0 16 16 0 8 0 mcl2k 2048 61 0 0 7 0 7 7 0 8 0 mtagpl 96 246 0 0 6 0 6 6 0 8 0 mbufpl 256 498 0 0 29 0 29 29 0 8 0 bufpl 280 6405 0 238 441 0 441 441 0 8 0 anonpl 24 284388 0 276813 99 28 71 71 0 185 5 amapchunkpl 152 64913 0 64238 45 11 34 34 0 158 6 amappl16 200 5640 0 5463 46 24 22 22 0 8 7 amappl15 192 8 0 7 1 0 1 1 0 8 0 amappl14 184 122 0 110 1 0 1 1 0 8 0 amappl13 176 10 0 10 2 2 0 1 0 8 0 amappl12 168 2961 0 2929 4 2 2 3 0 8 0 amappl11 160 70 0 56 1 0 1 1 0 8 0 amappl10 152 22 0 22 1 1 0 1 0 8 0 amappl9 144 244 0 244 1 1 0 1 0 8 0 amappl8 136 23 0 19 1 0 1 1 0 8 0 amappl7 128 117 0 104 1 0 1 1 0 8 0 amappl6 120 279 0 275 1 0 1 1 0 8 0 amappl5 112 142 0 132 1 0 1 1 0 8 0 amappl4 104 330 0 311 1 0 1 1 0 8 0 amappl3 96 13505 0 13378 4 0 4 4 0 8 0 amappl2 88 713 0 650 2 0 2 2 0 8 0 amappl1 80 13675 0 13091 15 1 14 15 0 8 0 amappl 88 19366 0 19169 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 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 128 255 0 255 3 3 0 1 0 8 0 dma64 64 8 0 8 3 3 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 134 0 4 3 0 3 3 0 8 0 uaddrrnd 24 2227 0 2195 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2227 0 2195 1 0 1 1 0 8 0 vmmpekpl 168 18223 0 18178 4 1 3 3 0 8 0 vmmpepl 168 138490 0 136376 120 18 102 102 0 357 1 vmsppl 456 2226 0 2195 8 3 5 5 0 8 0 rwobjpl 64 41661 0 34485 120 0 120 120 0 8 3 pdppl 4096 4461 0 4390 129 58 71 85 0 8 0 pvpl 32 20267 0 0 163 0 163 163 0 265 0 pmappl 248 2226 0 2195 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 353 0 87 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff834d0ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff8356ee30) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8356ee30) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80003c5c9300,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff8356ee30) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8356ee30) at __mp_lock+0x192 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x71d646610640, count: -9 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd806e150dd0,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806e150db8,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806e150db8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd8065b04368,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8065b04368,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_rdwr(0,fffffd8065b04368,ffff800011a26280,b6,0,1,980e4c726606cefa,0,ffff800000b2a000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd806502d148) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff828a4370,2902,8000,ffffffff8165bd70,ffff80003c5cf750) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff80003c5cf540) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd806def1b58,ffff80003c5cf750,0,fffffd807f7d37b8) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806fbf3d10,ffff80003c5cf750,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000ffffaa30,3,ffff80003c5cf750,0,ffff80003c5cf810) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff8000ffffaa30,ffff80003c5cf8c0,ffff80003c5cf810) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff80003c5cf8c0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5cf8c0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf477bab71d0, count: -16