witness: lock order reversal: 1st 0xfffffd806bf689d8 vmmaplk (&map->lock) 2nd 0xfffffd80675b43d0 inode (&ip->i_lock) lock order [1] vmmaplk (&map->lock) -> [2] inode (&ip->i_lock) #0 rw_enter+0x122 #1 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #2 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #3 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #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+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #12 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 lock order [2] inode (&ip->i_lock) -> [1] vmmaplk (&map->lock) #0 rw_enter_read+0xab sys/kern/kern_rwlock.c:112 #1 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1819 #2 uvm_fault_check+0x49 sys/uvm/uvm_fault.c:672 #3 uvm_fault+0xf5 sys/uvm/uvm_fault.c:600 #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+0xbe4 sys/kern/kern_exec.c:468 #14 start_init+0x3c6 sys/kern/init_main.c:714 #15 proc_trampoline+0x10 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd80675b43d0,9,0) at witness_checkorder+0x1047 rw_enter(fffffd80675b43c0,1) at rw_enter+0x122 rrw_enter(fffffd80675b43c0,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8063f5f988,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8063f5f988,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd8063f5f988,ffff800011a26040,1f,0,1,9d2f5e6eafa3453c,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd805d13e238) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff82c92c20,2902,8000,ffffffff82891340,ffff8000372a1ba0) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff8000372a1990) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd806e0d9eb8,ffff8000372a1ba0,0,fffffd807f7d3340) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806bd61018,ffff8000372a1ba0,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000ffff6020,3,ffff8000372a1ba0,0,ffff8000372a1c60) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff8000ffff6020,ffff8000372a1d10,ffff8000372a1c60) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff8000372a1d10) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000372a1d10) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf6d12230450, count: -16 ddb{0}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff8000372a1450 rbx 0xfffffd80042c74e8 rdx 0xffff8000012b1940 rcx 0xffff8000ffff6020 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff8000372a1330 r9 0x8080808080808080 r10 0xb1f48273a1383f5d r11 0xf096dcc3276372c8 r12 0 r13 0xfffffd8003adee00 r14 0x3 r15 0xffffffff rip 0xffffffff823851f5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000372a1440 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=253976 pid=30844 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff76e8,0xffffffff835f0b50 process=0xffff8000372c8010 user=0xffff80003729c000, vmspace=0xfffffd806bf688e0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 30844 377192 70641 0 3 0x80 fsleep syz-executor *30844 253976 70641 0 7 0x4000000 syz-executor 39992 503333 22977 0 3 0x4000080 nanoslp syz-executor 39992 261149 22977 0 3 0x4000080 kqpoll syz-executor 39992 210639 22977 0 3 0x4000080 fsleep syz-executor 39992 291351 22977 0 3 0x4000080 fsleep syz-executor 4809 38274 95602 0 3 0x80 fsleep syz-executor 4809 176473 95602 0 3 0x4000080 pipewr syz-executor 62764 25567 87047 0 3 0x80 fsleep syz-executor 62764 280367 87047 0 3 0x4000080 pipewr syz-executor 52135 456107 33459 0 3 0x80 fsleep syz-executor 52135 52846 33459 0 3 0x4000080 wsevent_read syz-executor 61386 355457 45658 0 3 0x80 fsleep syz-executor 61386 395916 45658 0 3 0x4000080 kqsel syz-executor 23134 256126 55697 0 3 0x80 fsleep syz-executor 23134 234157 55697 0 3 0x4000080 sbwait syz-executor 77127 426888 29617 0 3 0x80 fsleep syz-executor 77127 374293 29617 0 3 0x4000080 lockf syz-executor 24763 300108 0 0 3 0x14280 nfsidl nfsio 36590 443518 0 0 3 0x14280 nfsidl nfsio 97873 139736 0 0 3 0x14280 nfsidl nfsio 65635 318500 0 0 3 0x14280 nfsidl nfsio 69124 504507 0 0 3 0x14280 nfsidl nfsio 96134 308006 0 0 3 0x14280 nfsidl nfsio 3172 276811 0 0 3 0x14280 nfsidl nfsio 64075 328976 0 0 3 0x14280 nfsidl nfsio 91768 427559 0 0 3 0x14280 nfsidl nfsio 38303 281429 0 0 3 0x14280 nfsidl nfsio 25795 473991 0 0 3 0x14280 nfsidl nfsio 7053 433941 0 0 3 0x14280 nfsidl nfsio 38062 29328 0 0 3 0x14280 nfsidl nfsio 30108 387666 0 0 3 0x14280 nfsidl nfsio 44109 75587 0 0 3 0x14280 nfsidl nfsio 49805 189804 0 0 3 0x14280 nfsidl nfsio 53344 246297 0 0 3 0x14280 nfsidl nfsio 96922 361869 0 0 3 0x14280 nfsidl nfsio 9048 310949 0 0 3 0x14280 nfsidl nfsio 26967 20810 0 0 3 0x14280 nfsidl nfsio 80342 52653 0 0 3 0x14200 acct acct 29617 185835 6640 0 3 0x82 nanoslp syz-executor 88881 267768 1 0 3 0x100083 ttyin getty 33459 328415 6640 0 3 0x82 nanoslp syz-executor 85206 148600 0 0 3 0x14200 bored sosplice 70641 427719 6640 0 3 0x82 nanoslp syz-executor 87047 448788 6640 0 3 0x82 nanoslp syz-executor 22977 384837 6640 0 3 0x82 nanoslp syz-executor 45658 224463 6640 0 3 0x82 nanoslp syz-executor 95602 230052 6640 0 3 0x82 nanoslp syz-executor 55697 491011 6640 0 3 0x82 nanoslp syz-executor 6640 499487 88746 0 3 0x82 kqread syz-executor 88746 316283 35899 0 3 0x10008a sigsusp ksh 35899 166784 53565 0 3 0x98 kqread sshd-session 53565 128562 44143 0 3 0x92 kqread sshd-session 44143 38981 1 0 3 0x88 kqread sshd 88805 63314 28794 74 3 0x1100092 bpf pflogd 28794 27946 1 0 3 0x80 sbwait pflogd 20034 194837 25137 73 3 0x1100090 kqread syslogd 25137 89521 1 0 3 0x100082 sbwait syslogd 49883 386556 1 0 3 0x100080 kqread resolvd 70246 488291 10020 77 3 0x100092 kqread dhcpleased 43151 457627 10020 77 3 0x100092 kqread dhcpleased 10020 455450 1 0 3 0x80 kqread dhcpleased 52952 41725 0 0 3 0x14200 bored smr 70747 391 0 0 3 0x14200 pgzero zerothread 50773 256795 0 0 3 0x14200 aiodoned aiodoned 43214 345161 0 0 3 0x14200 syncer update 67114 166333 0 0 3 0x14200 cleaner cleaner 47533 360382 0 0 3 0x14200 reaper reaper 88863 371438 0 0 3 0x14200 pgdaemon pagedaemon 99370 336878 0 0 3 0x14200 bored viomb 97613 395306 0 0 3 0x40014200 acpi0 acpi0 62997 310383 0 0 7 0x40014200 idle1 9681 239242 0 0 3 0x14200 bored softnet3 21263 60974 0 0 3 0x14200 bored softnet2 5451 157898 0 0 3 0x14200 bored softnet1 75271 115705 0 0 3 0x14200 bored softnet0 6018 240033 0 0 3 0x14200 bored systqmp 75582 511789 0 0 3 0x14200 bored systq 10942 475956 0 0 3 0x14200 tmoslp softclockmp 65434 353458 0 0 2 0x40014200 softclock 77682 475112 0 0 3 0x40014200 idle0 1 216337 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 30844 (syz-executor) thread 0xffff8000ffff6020 (253976) shared rwlock vmmaplk r = 0 (0xfffffd806bf689d8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 uvm_vslock_device+0x149 sys/uvm/uvm_glue.c:172 #2 physio+0x277 sys/kern/kern_physio.c:139 #3 spec_read+0x155 sys/kern/spec_vnops.c:215 #4 VOP_READ+0x102 sys/kern/vfs_vops.c:227 #5 vn_read+0x17b sys/kern/vfs_vnops.c:369 #6 dofilereadv+0x230 sys/kern/sys_generic.c:252 #7 sys_readv+0xd8 sys/kern/sys_generic.c:199 #8 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #8 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8358f6c8) #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+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #4 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #5 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10215 11133K 11885K 166960K 13691 0 pcb 19 15K 17K 166960K 256 0 rtable 194 7K 7K 166960K 516 0 pf 38 18K 20K 166960K 96 0 ifaddr 41 7K 8K 166960K 80 0 ifgroup 59 2K 2K 166960K 114 0 sysctl 4 1K 2K 166960K 9 0 counters 66 36K 37K 166960K 98 0 ioctlops 0 0K 5K 166960K 1586 0 iov 1 2K 20K 166960K 126 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1483 93K 94K 166960K 2868 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 28 0 VM map 2 1K 1K 166960K 2 0 sem 26 5K 5K 166960K 58 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 93K 166960K 1415 0 sigio 0 0K 0K 166960K 23 0 proc 73 103K 140K 166960K 689 0 subproc 104 6K 6K 166960K 130 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 183 0 in_multi 84 6K 7K 166960K 186 0 ether_multi 1 0K 0K 166960K 19 0 mrt 1 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 667 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 258 74K 86K 166960K 14757 0 UVM aobj 131 8K 8K 166960K 133 0 pinsyscall 43 86K 110K 166960K 2550 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 49 0 NDP 13 0K 1K 166960K 52 0 temp 81 6828K 6896K 166960K 77011 0 kqueue 15 24K 30K 166960K 212 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 120 143 0 140 2 1 1 2 0 8 0 rtentry 112 156 0 71 4 0 4 4 0 8 0 unpcb 144 1225 0 1205 12 10 2 6 0 8 1 syncache 336 5 0 5 2 2 0 1 0 8 0 tcpcb 808 445 0 440 13 10 3 8 0 8 2 arp 120 25 0 10 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 3 0 3 1 1 0 1 0 8 0 inpcb 336 1649 0 1634 24 15 9 11 0 8 7 nd6 136 34 0 13 1 0 1 1 0 8 0 pkpcb 40 6 0 6 4 4 0 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1168 8 0 8 6 5 1 1 0 8 1 pfstscr 40 3 0 2 1 0 1 1 0 8 0 pffrag 232 13 0 7 1 0 1 1 0 482 0 pffrnode 88 12 0 7 1 0 1 1 0 8 0 pffrent 40 68 0 62 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 24 119 0 53 1 0 1 1 0 8 0 pfstkey 128 121 0 55 3 0 3 3 0 8 0 pfstate 376 119 0 54 8 0 8 8 0 8 0 pfrule 1344 22 0 16 2 0 2 2 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 664 0 272 34 7 27 30 0 8 1 art_table 32 668 0 272 4 0 4 4 0 8 0 art_node 16 150 0 75 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 8 1 0 1 1 0 8 0 semupl 112 3 0 3 2 2 0 1 0 8 0 semapl 112 51 0 27 1 0 1 1 0 8 0 shmpl 112 130 0 2 4 0 4 4 0 8 0 dirhash 1024 25 0 8 3 0 3 3 0 8 0 dino2pl 256 4051 0 2546 95 0 95 95 0 8 0 ffsino 272 4051 0 2546 101 0 101 101 0 8 0 nchpl 144 6038 0 4346 65 1 64 64 0 8 0 uvmvnodes 80 5020 0 0 103 0 103 103 0 8 0 vnodes 216 5020 0 0 279 0 279 279 0 8 0 namei 1024 21141 0 21141 4 3 1 2 0 8 1 percpumem 16 63 0 16 1 0 1 1 0 8 0 kstatmem 264 58 0 32 3 1 2 3 0 8 0 scsiplug 72 4 0 4 4 4 0 1 0 8 0 scxspl 216 18387 0 18387 11 10 1 8 1 8 1 plimitpl 152 286 0 268 1 0 1 1 0 8 0 sigapl 424 1756 0 1684 12 3 9 9 0 8 0 futexpl 64 26349 0 26340 1 0 1 1 0 8 0 knotepl 120 662 0 0 19 0 19 19 0 8 0 kqueuepl 216 394 0 381 5 4 1 5 0 8 0 pipepl 320 360 0 331 13 5 8 8 0 8 5 fdescpl 496 1694 0 1662 5 0 5 5 0 8 0 filepl 152 11616 0 11355 31 13 18 18 0 8 6 lockfpl 104 801 0 795 5 1 4 4 0 8 3 lockfspl 48 249 0 244 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 51 0 34 1 0 1 1 0 8 0 ucredpl 104 2211 0 2197 1 0 1 1 0 8 0 zombiepl 144 1684 0 1684 1 0 1 1 0 8 1 processpl 1160 1756 0 1684 8 2 6 6 0 8 0 procpl 648 3801 0 3719 10 2 8 8 0 8 1 srpgc 96 10 0 10 4 3 1 1 0 8 1 sosppl 168 4 0 4 2 1 1 1 0 8 1 sockpl 664 3042 0 3004 31 19 12 15 0 8 8 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 135 0 0 17 0 17 17 0 8 0 mcl2k 2048 39 0 0 4 0 4 4 0 8 0 mtagpl 96 66 0 0 2 0 2 2 0 8 0 mbufpl 256 933 0 0 59 0 59 59 0 8 0 bufpl 280 5417 0 103 380 0 380 380 0 8 0 anonpl 24 285409 0 272054 112 6 106 107 0 185 0 amapchunkpl 152 48746 0 48087 45 9 36 36 0 158 9 amappl16 200 7242 0 6723 47 7 40 40 0 8 0 amappl15 192 9 0 9 1 1 0 1 0 8 0 amappl14 184 121 0 109 1 0 1 1 0 8 0 amappl13 176 13 0 13 1 1 0 1 0 8 0 amappl12 168 2391 0 2359 4 2 2 3 0 8 0 amappl11 160 66 0 52 1 0 1 1 0 8 0 amappl10 152 24 0 24 1 1 0 1 0 8 0 amappl9 144 143 0 143 1 1 0 1 0 8 0 amappl8 136 35 0 32 1 0 1 1 0 8 0 amappl7 128 111 0 97 1 0 1 1 0 8 0 amappl6 120 182 0 180 1 0 1 1 0 8 0 amappl5 112 145 0 133 1 0 1 1 0 8 0 amappl4 104 319 0 300 1 0 1 1 0 8 0 amappl3 96 9004 0 8898 3 0 3 3 0 8 0 amappl2 88 2003 0 1915 3 0 3 3 0 8 0 amappl1 80 11988 0 11421 15 2 13 15 0 8 0 amappl 88 14232 0 14038 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 dma2048 2048 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 7 0 7 2 2 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 72 132 0 2 3 0 3 3 0 8 0 uaddrrnd 24 1694 0 1662 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1694 0 1662 1 0 1 1 0 8 0 vmmpekpl 168 14291 0 14245 3 0 3 3 0 8 0 vmmpepl 168 109406 0 106979 133 16 117 126 0 357 1 vmsppl 448 1693 0 1662 6 2 4 5 0 8 0 rwobjpl 56 36544 0 29945 93 0 93 93 0 8 0 pdppl 4096 3395 0 3324 105 34 71 85 0 8 0 pvpl 32 24891 0 0 201 0 201 201 0 265 0 pmappl 248 1693 0 1662 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 485 0 82 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd80675b43d0,9,0) at witness_checkorder+0x1047 rw_enter(fffffd80675b43c0,1) at rw_enter+0x122 rrw_enter(fffffd80675b43c0,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8063f5f988,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8063f5f988,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd8063f5f988,ffff800011a26040,1f,0,1,9d2f5e6eafa3453c,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd805d13e238) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff82c92c20,2902,8000,ffffffff82891340,ffff8000372a1ba0) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff8000372a1990) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd806e0d9eb8,ffff8000372a1ba0,0,fffffd807f7d3340) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806bd61018,ffff8000372a1ba0,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000ffff6020,3,ffff8000372a1ba0,0,ffff8000372a1c60) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff8000ffff6020,ffff8000372a1d10,ffff8000372a1c60) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff8000372a1d10) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000372a1d10) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf6d12230450, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029b7bff0) 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 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1218 sched_idle(ffff800029b7bff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -5