witness: lock order reversal: 1st 0xfffffd8070fc5d60 vmmaplk (&map->lock) 2nd 0xfffffd80718991b0 inode (&ip->i_lock) lock order [1] vmmaplk (&map->lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff83054785 -> 0xffffffff8306b4aa is missing 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(fffffd80718991b0,9,0) at witness_checkorder+0x1047 rw_enter(fffffd80718991a0,1) at rw_enter+0x122 rrw_enter(fffffd80718991a0,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd805d9e2510,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805d9e2510,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd805d9e2510,ffff800011a26440,3f,0,1,971bfba01e0421cb,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd80627a4b08) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff81c49cb0,2902,8000,ffffffff82774d40,ffff80002f5808f0) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff80002f5806e0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd807189beb8,ffff80002f5808f0,0,fffffd807f7d32d8) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd807141bee0,ffff80002f5808f0,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff80002a0e7470,3,ffff80002f5808f0,0,ffff80002f5809b0) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff80002a0e7470,ffff80002f580a60,ffff80002f5809b0) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff80002f580a60) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff80002f580a60) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3b33e62f6a0, count: -16 ddb{0}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff80002f5801a0 rbx 0xfffffd80042c3570 rdx 0xffff800001290900 rcx 0xffff80002a0e7470 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff80002f580080 r9 0x8080808080808080 r10 0x14ba3241ca11f9df r11 0xf5f16ba2d7717f26 r12 0 r13 0xfffffd8003adae00 r14 0x3 r15 0xffffffff rip 0xffffffff81610e15 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002f580190 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=476769 pid=48310 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a0e7980,0xffffffff835f1e20 process=0xffff8000fffe6d58 user=0xffff80002f57b000, vmspace=0xfffffd8070fc5c68 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 48310 318997 73217 0 3 0x80 fsleep syz-executor *48310 476769 73217 0 7 0x4000000 syz-executor 55414 419253 41675 0 3 0x80 fsleep syz-executor 55414 296565 41675 0 3 0x4000080 pipewr syz-executor 8480 24189 48107 0 3 0x80 fsleep syz-executor 8480 242913 48107 0 3 0x4000080 bell syz-executor 31005 442152 10261 0 3 0x80 fsleep syz-executor 31005 92008 10261 0 3 0x4000080 pipewr syz-executor 33405 374606 12398 0 3 0x80 fsleep syz-executor 33405 206153 12398 0 3 0x4000080 ttyout syz-executor 57050 274680 37891 0 3 0x80 fsleep syz-executor 57050 319426 37891 0 3 0x4000080 lockf syz-executor 37495 480172 19030 0 3 0x80 fsleep syz-executor 37495 450777 19030 0 3 0x4000080 kqsel syz-executor 86335 41176 67408 0 3 0x80 fsleep syz-executor 86335 18633 67408 0 3 0x4000080 sbwait syz-executor 86335 494535 67408 0 3 0x4000080 fsleep syz-executor 5106 491675 0 0 3 0x14280 nfsidl nfsio 25215 304427 0 0 3 0x14280 nfsidl nfsio 43977 68635 0 0 3 0x14280 nfsidl nfsio 7287 356482 0 0 3 0x14280 nfsidl nfsio 68250 176918 0 0 3 0x14280 nfsidl nfsio 10026 390813 0 0 3 0x14280 nfsidl nfsio 32033 206572 0 0 3 0x14280 nfsidl nfsio 69780 106728 0 0 3 0x14280 nfsidl nfsio 18815 258326 0 0 3 0x14280 nfsidl nfsio 10527 469855 0 0 3 0x14280 nfsidl nfsio 90757 324326 0 0 3 0x14280 nfsidl nfsio 61850 498776 0 0 3 0x14280 nfsidl nfsio 12575 345847 0 0 3 0x14280 nfsidl nfsio 7536 210439 0 0 3 0x14280 nfsidl nfsio 30899 515515 0 0 3 0x14280 nfsidl nfsio 42007 187626 0 0 3 0x14280 nfsidl nfsio 19489 314661 0 0 3 0x14280 nfsidl nfsio 51043 26458 0 0 3 0x14280 nfsidl nfsio 2909 341852 0 0 3 0x14280 nfsidl nfsio 57246 258967 0 0 3 0x14280 nfsidl nfsio 12398 243479 44604 0 3 0x82 nanoslp syz-executor 19030 494383 44604 0 2 0x482 syz-executor 59311 166538 1 0 3 0x100083 ttyin getty 41675 268909 44604 0 3 0x82 nanoslp syz-executor 51466 367099 0 0 3 0x14200 bored sosplice 37891 273997 44604 0 7 0x2 syz-executor 10261 96828 44604 0 2 0x482 syz-executor 48107 450724 44604 0 2 0x482 syz-executor 67408 441340 44604 0 3 0x82 nanoslp syz-executor 73217 240522 44604 0 3 0x82 nanoslp syz-executor 44604 276565 46577 0 3 0x82 kqread syz-executor 46577 505653 74995 0 3 0x10008a sigsusp ksh 74995 250136 67739 0 3 0x98 kqread sshd-session 67739 303317 6179 0 3 0x92 kqread sshd-session 6179 469790 1 0 3 0x88 kqread sshd 65940 412316 3439 74 3 0x1100092 bpf pflogd 3439 358415 1 0 3 0x80 sbwait pflogd 3498 23530 6299 73 3 0x1100090 kqread syslogd 6299 125197 1 0 3 0x100082 sbwait syslogd 30617 189124 1 0 3 0x100080 kqread resolvd 42795 144797 78473 77 3 0x100092 kqread dhcpleased 6676 272853 78473 77 3 0x100092 kqread dhcpleased 78473 506360 1 0 3 0x80 kqread dhcpleased 9480 392154 0 0 3 0x14200 bored smr 35792 50421 0 0 3 0x14200 pgzero zerothread 52854 170891 0 0 3 0x14200 aiodoned aiodoned 51107 308349 0 0 3 0x14200 syncer update 61941 373422 0 0 3 0x14200 cleaner cleaner 66320 88259 0 0 3 0x14200 reaper reaper 1951 53840 0 0 3 0x14200 pgdaemon pagedaemon 62145 97152 0 0 3 0x14200 bored viomb 42415 316388 0 0 3 0x40014200 acpi0 acpi0 6896 22368 0 0 3 0x40014200 idle1 98818 478719 0 0 3 0x14200 bored softnet3 39507 24032 0 0 3 0x14200 bored softnet2 71554 462125 0 0 3 0x14200 bored softnet1 70437 51368 0 0 3 0x14200 bored softnet0 28693 305914 0 0 3 0x14200 bored systqmp 50676 188971 0 0 3 0x14200 bored systq 18649 161156 0 0 2 0x14200 softclockmp 70512 219642 0 0 2 0x40014200 softclock 95908 192983 0 0 3 0x40014200 idle0 1 85237 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 48310 (syz-executor) thread 0xffff80002a0e7470 (476769) 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 __mp_acquire_count+0x58 #2 mi_switch+0x4b7 sys/kern/sched_bsd.c:441 #3 yield+0x6a sys/kern/sched_bsd.c:320 #4 pool_get+0x242 sys/kern/subr_pool.c:589 #5 uvm_mapent_alloc+0x35a #6 uvm_map+0x3b7 #7 km_alloc+0x20d sys/uvm/uvm_km.c:748 #8 vmapbuf+0xb3 sys/arch/amd64/amd64/vm_machdep.c:171 #9 physio+0x2e7 #10 spec_read+0x155 sys/kern/spec_vnops.c:215 #11 VOP_READ+0x102 sys/kern/vfs_vops.c:227 #12 vn_read+0x17b sys/kern/vfs_vnops.c:369 #13 dofilereadv+0x230 sys/kern/sys_generic.c:252 #14 sys_readv+0xd8 sys/kern/sys_generic.c:199 #15 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #15 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #16 Xsyscall+0x128 shared rwlock vmmaplk r = 0 (0xfffffd8070fc5d60) #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 Process 86335 (syz-executor) thread 0xffff8000ffff3970 (18633) exclusive rwlock sbufrcv r = 0 (0xffff80000130adc8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 sblock+0xb7 sys/kern/uipc_socket2.c:549 #3 soreceive+0x295 sys/kern/uipc_socket.c:945 #4 recvit+0x40a sys/kern/uipc_syscalls.c:1079 #5 sys_recvmmsg+0x3d3 sys/kern/uipc_syscalls.c:970 #6 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #6 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10231 11204K 11603K 166960K 13500 0 pcb 18 16K 19K 166960K 531 0 rtable 214 8K 8K 166960K 684 0 pf 37 18K 25K 166960K 116 0 ifaddr 40 7K 7K 166960K 88 0 ifgroup 59 2K 2K 166960K 134 0 sysctl 3 0K 0K 166960K 11 0 counters 66 36K 36K 166960K 108 0 ioctlops 0 0K 8K 166960K 1685 0 iov 1 4K 44K 166960K 172 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1588 100K 100K 166960K 3087 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 38 0 VM map 2 1K 1K 166960K 2 0 sem 23 6K 6K 166960K 34 0 dirhash 12 2K 2K 166960K 45 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 97K 166960K 1831 0 sigio 0 0K 0K 166960K 76 0 proc 72 91K 128K 166960K 800 0 subproc 104 6K 6K 166960K 156 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 402 0 in_multi 85 6K 7K 166960K 193 0 ether_multi 1 0K 0K 166960K 14 0 mrt 0 0K 0K 166960K 8 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 187 837K 837K 166960K 187 0 exec 0 0K 1K 166960K 764 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 252 74K 88K 166960K 18569 0 UVM aobj 131 6K 6K 166960K 134 0 pinsyscall 43 86K 106K 166960K 3058 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 84 0 NDP 13 0K 1K 166960K 61 0 temp 78 6828K 6915K 166960K 109410 0 kqueue 14 22K 30K 166960K 270 0 SYN cache 2 10K 18K 166960K 3 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 120 361 0 358 5 4 1 3 0 8 0 rtentry 112 226 0 132 4 0 4 4 0 8 0 unpcb 144 1340 0 1321 14 12 2 6 0 8 0 syncache 336 13 0 13 8 7 1 1 0 8 1 tcpcb 808 660 0 655 20 12 8 8 0 8 7 arp 120 34 0 18 1 0 1 1 0 8 0 inpcb 336 2212 0 2200 36 29 7 12 0 8 5 nd6 136 44 0 18 1 0 1 1 0 8 0 pkpcb 40 10 0 10 6 6 0 1 0 8 0 kcovpl 48 12 0 4 1 0 1 1 0 8 0 ppxss 1168 8 0 8 3 3 0 1 0 8 0 pffrag 232 12 0 6 2 1 1 1 0 482 0 pffrnode 88 11 0 6 2 1 1 1 0 8 0 pffrent 40 39 0 33 2 1 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 24 113 0 54 1 0 1 1 0 8 0 pfstkey 128 179 0 120 3 0 3 3 0 8 0 pfstate 376 145 0 87 7 0 7 7 0 8 0 pfrule 1344 25 0 19 2 0 2 2 0 8 0 art_heap8 4096 5 0 0 5 0 5 5 0 8 0 art_heap4 256 805 0 374 33 6 27 29 0 8 0 art_table 32 810 0 374 4 0 4 4 0 8 0 art_node 16 188 0 106 1 0 1 1 0 8 0 sysvmsgpl 40 176 0 169 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 30 0 9 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 39 0 22 3 0 3 3 0 8 0 dino2pl 256 4672 0 3169 95 0 95 95 0 8 0 ffsino 272 4672 0 3169 101 0 101 101 0 8 0 nchpl 144 7300 0 5603 64 0 64 64 0 8 0 uvmvnodes 80 5870 0 0 120 0 120 120 0 8 0 vnodes 216 5870 0 0 327 0 327 327 0 8 0 namei 1024 26125 0 26125 6 4 2 2 0 8 2 percpumem 16 68 0 21 1 0 1 1 0 8 0 kstatmem 264 68 0 42 2 0 2 2 0 8 0 scsiplug 72 6 0 6 3 3 0 1 0 8 0 scxspl 216 20632 0 20632 13 12 1 8 1 8 1 plimitpl 152 591 0 574 1 0 1 1 0 8 0 sigapl 424 2156 0 2085 9 1 8 8 0 8 0 futexpl 64 37899 0 37890 1 0 1 1 0 8 0 knotepl 120 586 0 0 18 0 18 18 0 8 0 kqueuepl 216 467 0 455 4 3 1 3 0 8 0 pipepl 320 476 0 447 16 13 3 11 0 8 0 fdescpl 496 2115 0 2083 6 1 5 6 0 8 0 filepl 152 15204 0 14943 36 23 13 20 0 8 2 lockfpl 104 538 0 534 1 0 1 1 0 8 0 lockfspl 48 234 0 231 1 0 1 1 0 8 0 sessionpl 144 35 0 26 1 0 1 1 0 8 0 pgrppl 48 67 0 50 1 0 1 1 0 8 0 ucredpl 104 2451 0 2437 1 0 1 1 0 8 0 zombiepl 144 2285 0 2285 2 1 1 1 0 8 1 processpl 1160 2156 0 2085 7 1 6 6 0 8 0 procpl 648 4810 0 4730 7 0 7 7 0 8 0 srpgc 96 11 0 11 4 4 0 1 0 8 0 sosppl 168 7 0 7 5 5 0 1 0 8 0 sockpl 664 3946 0 3913 39 30 9 17 0 8 5 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 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 9 0 0 2 0 2 2 0 8 0 mcl4k 4096 142 0 0 18 0 18 18 0 8 0 mcl2k 2048 26 0 0 4 0 4 4 0 8 0 mtagpl 96 75 0 0 2 0 2 2 0 8 0 mbufpl 256 422 0 0 24 0 24 24 0 8 0 bufpl 280 6460 0 285 442 0 442 442 0 8 0 anonpl 24 319841 0 302825 155 10 145 145 0 185 0 amapchunkpl 152 60045 0 59380 39 12 27 33 0 158 0 amappl16 200 7806 0 7082 67 5 62 62 0 8 0 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 144 0 132 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 2834 0 2802 3 1 2 2 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 9 0 9 2 2 0 1 0 8 0 amappl9 144 114 0 114 1 1 0 1 0 8 0 amappl8 136 27 0 23 1 0 1 1 0 8 0 amappl7 128 123 0 111 1 0 1 1 0 8 0 amappl6 120 205 0 203 1 0 1 1 0 8 0 amappl5 112 160 0 147 1 0 1 1 0 8 0 amappl4 104 360 0 342 1 0 1 1 0 8 0 amappl3 96 11286 0 11183 3 0 3 3 0 8 0 amappl2 88 2483 0 2396 4 1 3 3 0 8 0 amappl1 80 14786 0 14216 15 1 14 14 0 8 0 amappl 88 17993 0 17803 6 1 5 5 0 92 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma32768 32768 3 0 3 2 2 0 1 0 8 0 dma16384 16384 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 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 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 72 133 0 3 3 0 3 3 0 8 0 uaddrrnd 24 2115 0 2083 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2115 0 2083 1 0 1 1 0 8 0 vmmpekpl 168 17528 0 17472 3 0 3 3 0 8 0 vmmpepl 168 136450 0 133827 149 16 133 137 0 357 0 vmsppl 448 2114 0 2083 6 2 4 5 0 8 0 rwobjpl 56 43588 0 35942 108 0 108 108 0 8 0 pdppl 4096 4237 0 4166 125 54 71 87 0 8 0 pvpl 32 30441 0 0 249 3 246 246 0 265 0 pmappl 248 2114 0 2083 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 498 0 123 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(fffffd80718991b0,9,0) at witness_checkorder+0x1047 rw_enter(fffffd80718991a0,1) at rw_enter+0x122 rrw_enter(fffffd80718991a0,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd805d9e2510,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805d9e2510,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd805d9e2510,ffff800011a26440,3f,0,1,971bfba01e0421cb,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd80627a4b08) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff81c49cb0,2902,8000,ffffffff82774d40,ffff80002f5808f0) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff80002f5806e0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd807189beb8,ffff80002f5808f0,0,fffffd807f7d32d8) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd807141bee0,ffff80002f5808f0,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff80002a0e7470,3,ffff80002f5808f0,0,ffff80002f5809b0) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff80002a0e7470,ffff80002f580a60,ffff80002f5809b0) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff80002f580a60) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff80002f580a60) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3b33e62f6a0, 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 syscall(ffff80002a16e8f0) at syscall+0x2cc mi_syscall sys/sys/syscall_mi.h:155 [inline] syscall(ffff80002a16e8f0) at syscall+0x2cc sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ef1afe63da0, count: -6