witness: lock order reversal: 1st 0xfffffd806bff3818 vmmaplk (&map->lock) 2nd 0xfffffd807c9ae708 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(fffffd807c9ae708,9,0) at witness_checkorder+0x1047 rw_enter(fffffd807c9ae6f8,1) at rw_enter+0x122 rrw_enter(fffffd807c9ae6f8,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8068b96648,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8068b96648,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd8068b96648,ffff800011a37440,3f,0,1,75e2418532bf0317,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd805dde6d38) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff81c49cb0,2902,8000,ffffffff82774d40,ffff8000372b44b0) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff8000372b42a0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd806e6b9eb8,ffff8000372b44b0,0,fffffd807f7d31a0) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806bf39ef8,ffff8000372b44b0,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff800032f82f58,3,ffff8000372b44b0,0,ffff8000372b4570) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff800032f82f58,ffff8000372b4620,ffff8000372b4570) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff8000372b4620) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000372b4620) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa87a83d0d30, count: -16 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff8000372b3d60 rbx 0xfffffd80042c2580 rdx 0 rcx 0xffff800032f82f58 rax 0xffffffff8349fff0 cpu_info_full_primary+0x1ff0 r8 0xffff8000372b3c40 r9 0x8080808080808080 r10 0xc2c230d21e701643 r11 0x6357ec24498f198d r12 0 r13 0xfffffd8003adae00 r14 0x3 r15 0xffffffff rip 0xffffffff81610e15 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000372b3d50 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=430902 pid=98708 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=0xffff800032f82538,0xffffffff835f1e20 process=0xffff8000fffec910 user=0xffff8000372af000, vmspace=0xfffffd806bff3720 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 98708 210706 91812 0 3 0x80 fsleep syz-executor *98708 430902 91812 0 7 0x4000000 syz-executor 46842 118608 69420 0 3 0x80 fsleep syz-executor 46842 452864 69420 0 3 0x4000080 sbwait syz-executor 46900 43718 70223 0 3 0x80 fsleep syz-executor 46900 50162 70223 0 7 0x4000000 syz-executor 75307 325283 8352 0 3 0x80 nanoslp syz-executor 75307 284698 8352 0 3 0x4000080 kqsel syz-executor 75307 358377 8352 0 3 0x4000080 fsleep syz-executor 75307 199649 8352 0 3 0x4000080 fsleep syz-executor 24841 365994 73477 0 3 0x80 fsleep syz-executor 24841 269538 73477 0 3 0x4000080 ttyout syz-executor 52668 352042 28863 0 3 0x80 fsleep syz-executor 52668 263852 28863 0 3 0x4000080 fifow syz-executor 57527 357827 40698 0 3 0x80 fsleep syz-executor 57527 422402 40698 0 3 0x4000080 sbwait syz-executor 21011 308611 13738 0 3 0x80 fsleep syz-executor 21011 518163 13738 0 3 0x4000080 netcon syz-executor 76280 245386 0 0 3 0x14280 nfsidl nfsio 33288 494073 0 0 3 0x14280 nfsidl nfsio 12331 170296 0 0 3 0x14280 nfsidl nfsio 39278 46421 0 0 3 0x14280 nfsidl nfsio 65766 257222 0 0 3 0x14280 nfsidl nfsio 35713 172492 0 0 3 0x14280 nfsidl nfsio 11192 227057 0 0 3 0x14280 nfsidl nfsio 60908 133778 0 0 3 0x14280 nfsidl nfsio 44561 85055 0 0 3 0x14280 nfsidl nfsio 98471 122163 0 0 3 0x14280 nfsidl nfsio 76267 246565 0 0 3 0x14280 nfsidl nfsio 55184 358006 0 0 3 0x14280 nfsidl nfsio 79602 515897 0 0 3 0x14280 nfsidl nfsio 56252 277870 0 0 3 0x14280 nfsidl nfsio 10937 50827 0 0 3 0x14280 nfsidl nfsio 63246 176814 0 0 3 0x14280 nfsidl nfsio 54759 466703 0 0 3 0x14280 nfsidl nfsio 4775 389876 0 0 3 0x14280 nfsidl nfsio 64979 232665 0 0 3 0x14280 nfsidl nfsio 31823 311577 0 0 3 0x14280 nfsidl nfsio 92277 17670 0 0 3 0x14200 bored sosplice 69420 36208 89392 0 3 0x82 nanoslp syz-executor 70223 311014 89392 0 2 0x482 syz-executor 91812 338632 89392 0 3 0x82 nanoslp syz-executor 8352 419389 89392 0 2 0x482 syz-executor 73477 275888 89392 0 3 0x82 nanoslp syz-executor 40698 383322 89392 0 3 0x82 nanoslp syz-executor 13738 42631 89392 0 3 0x82 nanoslp syz-executor 28863 50321 89392 0 3 0x82 nanoslp syz-executor 89392 497185 9254 0 3 0x82 kqread syz-executor 9254 25260 39353 0 3 0x10008a sigsusp ksh 39353 83093 39849 0 3 0x98 kqread sshd-session 39849 207067 63266 0 3 0x92 kqread sshd-session 98724 5628 1 0 3 0x100083 ttyin getty 63266 110371 1 0 3 0x88 kqread sshd 65049 499619 60976 74 3 0x1100092 bpf pflogd 60976 99386 1 0 3 0x80 sbwait pflogd 60422 483098 24977 73 3 0x1100090 kqread syslogd 24977 171558 1 0 3 0x100082 sbwait syslogd 25858 78801 1 0 3 0x100080 kqread resolvd 88108 463236 22902 77 3 0x100092 kqread dhcpleased 62998 327781 22902 77 3 0x100092 kqread dhcpleased 22902 31474 1 0 3 0x80 kqread dhcpleased 83092 188854 0 0 3 0x14200 bored smr 50787 385270 0 0 3 0x14200 pgzero zerothread 19381 171591 0 0 3 0x14200 aiodoned aiodoned 46217 222878 0 0 3 0x14200 syncer update 77049 287172 0 0 3 0x14200 cleaner cleaner 77127 127546 0 0 3 0x14200 reaper reaper 66586 305161 0 0 3 0x14200 pgdaemon pagedaemon 37148 90281 0 0 3 0x14200 bored viomb 94334 133626 0 0 3 0x40014200 acpi0 acpi0 97899 351317 0 0 3 0x40014200 idle1 61658 333893 0 0 3 0x14200 bored softnet3 60428 380844 0 0 3 0x14200 bored softnet2 76323 237130 0 0 3 0x14200 bored softnet1 43784 341711 0 0 3 0x14200 bored softnet0 86582 114066 0 0 3 0x14200 bored systqmp 10005 182192 0 0 3 0x14200 bored systq 28593 91719 0 0 3 0x14200 tmoslp softclockmp 35704 95988 0 0 2 0x40014200 softclock 3377 92740 0 0 3 0x40014200 idle0 1 208393 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 98708 (syz-executor) thread 0xffff800032f82f58 (430902) shared rwlock vmmaplk r = 0 (0xfffffd806bff3818) #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 (0xffffffff8359d538) #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 Process 46900 (syz-executor) thread 0xffff80002a03fbf8 (50162) shared rwlock vmmaplk r = 0 (0xfffffd806bff32d8) #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_pread+0xae sys/kern/vfs_syscalls.c:3293 #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10197 11195K 11446K 166960K 11867 0 pcb 17 14K 16K 166960K 165 0 rtable 197 6K 7K 166960K 412 0 pf 34 17K 18K 166960K 58 0 ifaddr 39 6K 7K 166960K 54 0 ifgroup 51 2K 2K 166960K 63 0 sysctl 2 0K 0K 166960K 2 0 counters 62 36K 36K 166960K 72 0 ioctlops 0 0K 4K 166960K 1528 0 iov 2 4K 24K 166960K 36 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1401 88K 89K 166960K 1742 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 11 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 79 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 93K 166960K 529 0 sigio 0 0K 0K 166960K 10 0 proc 72 91K 164K 166960K 598 0 subproc 104 6K 6K 166960K 104 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 39 0 in_multi 87 6K 7K 166960K 111 0 ether_multi 1 0K 0K 166960K 5 0 mrt 1 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 470 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 264 74K 90K 166960K 6711 0 UVM aobj 13 6K 6K 166960K 17 0 pinsyscall 43 86K 102K 166960K 1608 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 21 0 NDP 12 0K 2K 166960K 33 0 temp 51 6821K 6886K 166960K 50652 0 kqueue 13 20K 28K 166960K 84 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 97 0 93 2 0 2 2 0 8 1 rtentry 112 127 0 37 4 0 4 4 0 8 0 unpcb 144 332 0 309 1 0 1 1 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 808 163 0 157 8 7 1 8 0 8 0 arp 120 24 0 8 1 0 1 1 0 8 0 inpcb 336 535 0 525 12 5 7 7 0 8 5 ip6q 72 1 0 1 1 0 1 1 0 8 1 ip6af 40 2 0 2 1 0 1 1 0 8 1 nd6 136 25 0 5 1 0 1 1 0 8 0 pkpcb 40 3 0 3 2 1 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 4 0 4 1 0 1 1 0 8 1 pfstscr 40 5 0 5 1 0 1 1 0 8 1 pffrag 232 6 0 0 1 0 1 1 0 482 0 pffrnode 88 6 0 0 1 0 1 1 0 8 0 pffrent 40 9 0 3 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 47 0 4 1 0 1 1 0 8 0 pfstkey 128 52 0 9 2 0 2 2 0 8 0 pfstate 376 50 0 7 5 0 5 5 0 8 0 pfrule 1344 31 0 25 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 458 0 76 29 0 29 29 0 8 1 art_table 32 459 0 76 4 0 4 4 0 8 0 art_node 16 123 0 45 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 4 1 0 1 1 0 8 0 semapl 112 77 0 67 1 0 1 1 0 8 0 shmpl 112 14 0 4 1 0 1 1 0 8 0 dirhash 1024 30 0 13 3 0 3 3 0 8 0 dino2pl 256 2347 0 841 95 0 95 95 0 8 0 ffsino 272 2347 0 841 102 1 101 102 0 8 0 nchpl 144 3083 0 1396 63 0 63 63 0 8 0 uvmvnodes 80 2647 0 0 55 0 55 55 0 8 0 vnodes 216 2647 0 0 148 0 148 148 0 8 0 namei 1024 9954 0 9954 2 1 1 2 0 8 1 percpumem 16 50 0 5 1 0 1 1 0 8 0 kstatmem 264 32 0 10 2 0 2 2 0 8 0 scxspl 216 9460 0 9460 10 2 8 8 1 8 8 plimitpl 152 108 0 91 1 0 1 1 0 8 0 sigapl 424 851 0 780 8 0 8 8 0 8 0 futexpl 64 7004 0 6995 1 0 1 1 0 8 0 knotepl 120 568 0 0 18 0 18 18 0 8 0 kqueuepl 216 183 0 172 3 2 1 3 0 8 0 pipepl 320 146 0 119 3 0 3 3 0 8 0 fdescpl 496 812 0 780 5 0 5 5 0 8 0 filepl 152 4350 0 4096 17 4 13 15 0 8 2 lockfpl 104 143 0 141 1 0 1 1 0 8 0 lockfspl 48 61 0 59 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 33 0 16 1 0 1 1 0 8 0 ucredpl 104 627 0 612 1 0 1 1 0 8 0 zombiepl 144 780 0 780 1 0 1 1 0 8 1 processpl 1160 851 0 780 6 0 6 6 0 8 0 procpl 648 1506 0 1425 9 1 8 8 0 8 1 srpgc 96 4 0 4 1 0 1 1 0 8 1 sosppl 168 3 0 3 1 1 0 1 0 8 0 sockpl 664 973 0 936 13 4 9 9 0 8 5 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 132 0 0 17 0 17 17 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 8 0 0 1 0 1 1 0 8 0 mbufpl 256 250 0 0 16 0 16 16 0 8 0 bufpl 280 3168 0 100 220 0 220 220 0 8 0 anonpl 24 250063 0 230792 159 1 158 158 0 185 0 amapchunkpl 152 22873 0 22118 36 4 32 32 0 158 0 amappl16 200 7898 0 7106 67 7 60 60 0 8 0 amappl15 192 23 0 23 1 1 0 1 0 8 0 amappl14 184 116 0 104 1 0 1 1 0 8 0 amappl13 176 18 0 18 1 1 0 1 0 8 0 amappl12 168 1465 0 1433 4 2 2 3 0 8 0 amappl11 160 59 0 45 1 0 1 1 0 8 0 amappl10 152 15 0 15 2 2 0 1 0 8 0 amappl9 144 149 0 149 1 1 0 1 0 8 0 amappl8 136 44 0 41 1 0 1 1 0 8 0 amappl7 128 106 0 94 1 0 1 1 0 8 0 amappl6 120 191 0 189 1 0 1 1 0 8 0 amappl5 112 136 0 124 1 0 1 1 0 8 0 amappl4 104 309 0 288 1 0 1 1 0 8 0 amappl3 96 3970 0 3868 3 0 3 3 0 8 0 amappl2 88 1081 0 995 3 0 3 3 0 8 0 amappl1 80 8705 0 8136 14 1 13 14 0 8 1 amappl 88 6314 0 6113 5 0 5 5 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 7 0 7 2 2 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 16 0 4 1 0 1 1 0 8 0 uaddrrnd 24 812 0 780 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 812 0 780 1 0 1 1 0 8 0 vmmpekpl 168 7560 0 7521 3 0 3 3 0 8 0 vmmpepl 168 60892 0 58189 132 0 132 132 0 357 0 vmsppl 448 811 0 780 6 2 4 5 0 8 0 rwobjpl 56 25193 0 20811 66 0 66 66 0 8 0 pdppl 4096 1631 0 1560 105 34 71 85 0 8 0 pvpl 32 33251 0 0 269 0 269 269 0 265 0 pmappl 248 811 0 780 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 407 0 53 11 0 11 11 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(fffffd807c9ae708,9,0) at witness_checkorder+0x1047 rw_enter(fffffd807c9ae6f8,1) at rw_enter+0x122 rrw_enter(fffffd807c9ae6f8,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8068b96648,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8068b96648,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd8068b96648,ffff800011a37440,3f,0,1,75e2418532bf0317,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd805dde6d38) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff81c49cb0,2902,8000,ffffffff82774d40,ffff8000372b44b0) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff8000372b42a0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd806e6b9eb8,ffff8000372b44b0,0,fffffd807f7d31a0) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806bf39ef8,ffff8000372b44b0,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff800032f82f58,3,ffff8000372b44b0,0,ffff8000372b4570) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff800032f82f58,ffff8000372b4620,ffff8000372b4570) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff8000372b4620) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000372b4620) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa87a83d0d30, 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 __mp_lock(ffffffff8359d330) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8359d330) at __mp_lock+0x192 sys/kern/kern_lock.c:144 __mp_acquire_count(ffffffff8359d330,1) at __mp_acquire_count+0x58 mi_switch() at mi_switch+0x4b7 sys/kern/sched_bsd.c:441 sleep_finish(0,1) at sleep_finish+0x2f2 sys/kern/kern_synch.c:425 physio(ffffffff82ddb9a0,d02,8000,ffffffff82ddc200,ffff8000371cbda8) at physio+0x361 sys/kern/kern_physio.c:165 spec_read(ffff8000371cbc10) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd805c96b888,ffff8000371cbda8,0,fffffd807f7d31a0) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806bf39d30,ffff8000371cbda8,1) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff80002a03fbf8,3,ffff8000371cbda8,1,ffff8000371cbe60) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_pread(ffff80002a03fbf8,ffff8000371cbf10,ffff8000371cbe60) at sys_pread+0xae sys/kern/vfs_syscalls.c:3293 syscall(ffff8000371cbf10) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000371cbf10) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa891e116e90, count: -15