login: witness: lock order reversal: 1st 0xfffffd80698c84a0 vmmaplk (&map->lock) 2nd 0xfffffd8064fd95f0 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(fffffd8064fd95f0,9,0) at witness_checkorder+0x1047 rw_enter(fffffd8064fd95e0,1) at rw_enter+0x122 rrw_enter(fffffd8064fd95e0,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8060591210,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8060591210,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd8060591210,ffff800011a26100,1000,0,1,83282a383b27730a,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd805e3458c0) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff82bab230,2902,8000,ffffffff823a6610,ffff80002d57a400) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff80002d57a1f0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd806e67ca80,ffff80002d57a400,0,fffffd807f7d3410) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806c020ab0,ffff80002d57a400,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000ffff1468,4,ffff80002d57a400,0,ffff80002d57a4c0) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff8000ffff1468,ffff80002d57a570,ffff80002d57a4c0) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff80002d57a570) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff80002d57a570) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x808413dc460, count: -16 ddb{0}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff80002d579cb0 rbx 0xfffffd80042c7f98 rdx 0xffff800000045b80 rcx 0xffff8000ffff1468 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff80002d579b90 r9 0x8080808080808080 r10 0xddf1d21a9c6ea503 r11 0xb234bfe476202be8 r12 0 r13 0xfffffd8003adfe00 r14 0x3 r15 0xffffffff rip 0xffffffff8189edc5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002d579ca0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=332438 pid=87866 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=0xffff8000ffff16f0,0xffff8000ffff0ce0 process=0xffff8000fffef680 user=0xffff80002d575000, vmspace=0xfffffd80698c83a8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 18851 398641 13799 0 2 0x10 syz-executor 18851 346723 13799 0 2 0x4000010 syz-executor 87866 281692 54991 0 2 0 syz-executor *87866 332438 54991 0 7 0x4000000 syz-executor 43685 83839 59283 0 3 0x80 nanoslp syz-executor 43685 123259 59283 0 3 0x4000080 sbwait syz-executor 43685 481120 59283 0 3 0x4000080 fsleep syz-executor 64026 59987 99375 0 3 0x80 nanoslp syz-executor 64026 474831 99375 0 3 0x4000080 msgwait syz-executor 64026 130013 99375 0 3 0x4000080 fsleep syz-executor 64026 229199 99375 0 3 0x4000080 fsleep syz-executor 53189 312216 85306 0 3 0x80 nanoslp syz-executor 53189 31360 85306 0 3 0x4000080 sbwait syz-executor 53189 215886 85306 0 3 0x4000080 fsleep syz-executor 53189 97848 85306 0 3 0x4000080 fsleep syz-executor 85306 285214 89439 0 3 0x82 nanoslp syz-executor 696 221975 1 0 3 0x80 nanoslp init 43130 334347 0 0 3 0x14200 bored sosplice 140 87746 89439 0 3 0x82 wait syz-executor 99375 162795 89439 0 3 0x82 nanoslp syz-executor 54939 500225 89439 0 2 0x2 syz-executor 13799 270163 89439 0 3 0x82 nanoslp syz-executor 27943 435742 89439 0 3 0x82 nanoslp syz-executor 59283 265389 89439 0 3 0x82 nanoslp syz-executor 54991 270229 89439 0 3 0x82 nanoslp syz-executor 89439 464850 28946 0 3 0x82 kqread syz-executor 28946 372254 60405 0 3 0x10008a sigsusp ksh 60405 72738 70868 0 3 0x98 kqread sshd-session 70868 283473 65120 0 3 0x92 kqread sshd-session 65120 148920 1 0 3 0x88 kqread sshd 67220 77581 8592 74 3 0x1100092 bpf pflogd 8592 81504 1 0 3 0x80 sbwait pflogd 39432 120116 28253 73 3 0x1100090 kqread syslogd 28253 363181 1 0 3 0x100082 sbwait syslogd 63056 119659 1 0 3 0x100080 kqread resolvd 48653 451604 92192 77 3 0x100092 kqread dhcpleased 38173 336789 92192 77 3 0x100092 kqread dhcpleased 92192 320116 1 0 3 0x80 kqread dhcpleased 55862 218224 0 0 3 0x14200 bored smr 94282 410023 0 0 2 0x14200 zerothread 21205 46287 0 0 3 0x14200 aiodoned aiodoned 6024 443260 0 0 3 0x14200 syncer update 51763 364109 0 0 3 0x14200 cleaner cleaner 94527 353580 0 0 7 0x14200 reaper 91982 39538 0 0 3 0x14200 pgdaemon pagedaemon 64790 244580 0 0 3 0x14200 bored viomb 38855 151001 0 0 3 0x40014200 acpi0 acpi0 57743 337108 0 0 3 0x40014200 idle1 58682 484807 0 0 3 0x14200 bored softnet3 74761 450339 0 0 3 0x14200 bored softnet2 60829 16009 0 0 3 0x14200 bored softnet1 73678 294963 0 0 3 0x14200 bored softnet0 58940 312920 0 0 3 0x14200 bored systqmp 23100 42586 0 0 3 0x14200 bored systq 15200 490547 0 0 3 0x14200 tmoslp softclockmp 5847 320982 0 0 3 0x40014200 tmoslp softclock 18840 12309 0 0 3 0x40014200 idle0 1 360146 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 87866 (syz-executor) thread 0xffff8000ffff1468 (332438) shared rwlock vmmaplk r = 0 (0xfffffd80698c84a0) #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 (0xffffffff835fcde8) #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 54939 (syz-executor) thread 0xffff800029fd91c0 (500225) exclusive rrwlock inode r = 0 (0xfffffd806f1ef4e0) #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 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:169 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0x113 sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x102 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3099 #10 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] #10 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806cdd1098) #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 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3084 #8 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] #8 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10242 11272K 11620K 166960K 12322 0 pcb 17 15K 16K 166960K 221 0 rtable 224 7K 8K 166960K 505 0 pf 43 19K 19K 166960K 88 0 ifaddr 43 7K 7K 166960K 71 0 ifgroup 64 2K 2K 166960K 102 0 sysctl 2 0K 0K 166960K 6 0 counters 68 36K 36K 166960K 90 0 ioctlops 0 0K 4K 166960K 1708 0 iov 1 2K 16K 166960K 57 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1486 93K 94K 166960K 2337 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 37 0 VM map 2 1K 1K 166960K 2 0 sem 25 3K 3K 166960K 45 0 dirhash 12 2K 2K 166960K 39 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 16 57K 97K 166960K 1142 0 sigio 1 0K 0K 166960K 25 0 proc 63 79K 152K 166960K 705 0 subproc 104 6K 6K 166960K 118 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 127 0 in_multi 91 6K 7K 166960K 172 0 ether_multi 1 0K 0K 166960K 5 0 mrt 2 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 253 1129K 1129K 166960K 253 0 exec 0 0K 1K 166960K 504 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 244 74K 88K 166960K 12346 0 UVM aobj 55 7K 7K 166960K 59 0 pinsyscall 40 80K 106K 166960K 2262 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 57 0 NDP 15 0K 2K 166960K 47 0 temp 66 6825K 7071K 166960K 49047 0 kqueue 17 28K 30K 166960K 189 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 120 136 0 133 2 1 1 2 0 8 0 rtentry 112 155 0 55 4 0 4 4 0 8 0 unpcb 144 808 0 783 8 6 2 6 0 8 1 syncache 336 5 0 5 3 3 0 1 0 8 0 tcpcb 808 334 0 330 11 3 8 8 0 8 7 arp 120 28 0 7 1 0 1 1 0 8 0 inpcb 336 1052 0 1043 12 5 7 7 0 8 5 nd6 136 32 0 13 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1168 5 0 5 2 1 1 1 0 8 1 pfstscr 40 3 0 2 1 0 1 1 0 8 0 pffrag 232 18 0 3 1 0 1 1 0 482 0 pffrnode 88 17 0 3 1 0 1 1 0 8 0 pffrent 40 31 0 16 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 pfrktable 1344 1 0 1 1 1 0 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 80 0 19 1 0 1 1 0 8 0 pfstkey 128 84 0 23 3 0 3 3 0 8 0 pfstate 376 81 0 21 7 0 7 7 0 8 0 pfrule 1344 28 0 21 2 0 2 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 673 0 230 30 2 28 29 0 8 0 art_table 32 675 0 230 4 0 4 4 0 8 0 art_node 16 152 0 62 1 0 1 1 0 8 0 sysvmsgpl 40 21 0 10 1 0 1 1 0 8 0 semupl 112 2 0 2 2 1 1 1 0 8 1 semapl 112 39 0 16 1 0 1 1 0 8 0 shmpl 112 56 0 4 2 0 2 2 0 8 0 dirhash 1024 35 0 18 3 0 3 3 0 8 0 dino2pl 256 3561 0 2064 95 0 95 95 0 8 0 ffsino 272 3561 0 2064 102 0 102 102 0 8 0 nchpl 144 5182 0 3491 63 0 63 63 0 8 0 uvmvnodes 80 4174 0 0 86 0 86 86 0 8 0 vnodes 216 4174 0 0 232 0 232 232 0 8 0 namei 1024 17275 0 17274 3 2 1 2 0 8 0 percpumem 16 59 0 11 1 0 1 1 0 8 0 kstatmem 264 50 0 22 2 0 2 2 0 8 0 scsiplug 72 5 0 5 1 0 1 1 0 8 1 scxspl 216 16073 0 16073 11 8 3 8 1 8 3 plimitpl 152 399 0 382 1 0 1 1 0 8 0 sigapl 424 1449 0 1399 7 1 6 7 0 8 0 futexpl 64 14924 0 14919 1 0 1 1 0 8 0 knotepl 120 330 0 0 10 0 10 10 0 8 0 kqueuepl 216 417 0 404 9 4 5 5 0 8 4 pipepl 320 333 0 306 8 4 4 8 0 8 1 fdescpl 496 1427 0 1397 6 1 5 6 0 8 0 filepl 152 9008 0 8745 19 5 14 15 0 8 3 lockfpl 104 330 0 328 1 0 1 1 0 8 0 lockfspl 48 140 0 138 1 0 1 1 0 8 0 sessionpl 144 26 0 18 1 0 1 1 0 8 0 pgrppl 48 41 0 25 1 0 1 1 0 8 0 ucredpl 104 1978 0 1962 1 0 1 1 0 8 0 zombiepl 144 1401 0 1399 1 0 1 1 0 8 0 processpl 1160 1449 0 1399 5 1 4 5 0 8 0 procpl 648 3065 0 3005 6 0 6 6 0 8 0 srpgc 96 4 0 4 2 2 0 1 0 8 0 sosppl 168 4 0 4 2 1 1 1 0 8 1 sockpl 664 2017 0 1981 18 9 9 14 0 8 5 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 7 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 19 0 0 3 0 3 3 0 8 0 mcl4k 4096 148 0 0 19 0 19 19 0 8 0 mcl2k 2048 30 0 0 4 0 4 4 0 8 0 mtagpl 96 22 0 0 1 0 1 1 0 8 0 mbufpl 256 339 0 0 21 0 21 21 0 8 0 bufpl 280 5402 0 98 379 0 379 379 0 8 0 anonpl 24 317408 0 309602 74 1 73 73 0 185 18 amapchunkpl 152 42067 0 41416 38 2 36 36 0 158 8 amappl16 200 8772 0 8610 37 20 17 22 0 8 8 amappl15 192 21 0 21 1 1 0 1 0 8 0 amappl14 184 133 0 122 1 0 1 1 0 8 0 amappl13 176 17 0 17 2 1 1 1 0 8 1 amappl12 168 2091 0 2062 4 1 3 3 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 17 0 17 1 1 0 1 0 8 0 amappl9 144 134 0 134 1 1 0 1 0 8 0 amappl8 136 37 0 34 1 0 1 1 0 8 0 amappl7 128 119 0 107 1 0 1 1 0 8 0 amappl6 120 183 0 181 1 0 1 1 0 8 0 amappl5 112 166 0 153 1 0 1 1 0 8 0 amappl4 104 325 0 307 1 0 1 1 0 8 0 amappl3 96 7451 0 7360 3 0 3 3 0 8 0 amappl2 88 1737 0 1654 3 0 3 3 0 8 0 amappl1 80 11116 0 10570 15 2 13 14 0 8 0 amappl 88 11866 0 11681 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma16384 16384 1 0 1 1 1 0 1 0 8 0 dma8192 8192 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 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 255 0 255 3 2 1 1 0 8 1 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 58 0 4 1 0 1 1 0 8 0 uaddrrnd 24 1427 0 1397 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1427 0 1397 1 0 1 1 0 8 0 vmmpekpl 168 12545 0 12499 3 0 3 3 0 8 0 vmmpepl 168 96225 0 94282 100 1 99 99 0 357 8 vmsppl 448 1426 0 1397 6 2 4 5 0 8 0 rwobjpl 56 34492 0 29213 76 0 76 76 0 8 1 pdppl 4096 2861 0 2794 107 36 71 87 0 8 4 pvpl 32 18590 0 0 152 2 150 150 0 265 0 pmappl 248 1426 0 1397 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 432 0 60 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(fffffd8064fd95f0,9,0) at witness_checkorder+0x1047 rw_enter(fffffd8064fd95e0,1) at rw_enter+0x122 rrw_enter(fffffd8064fd95e0,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8060591210,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8060591210,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd8060591210,ffff800011a26100,1000,0,1,83282a383b27730a,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd805e3458c0) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff82bab230,2902,8000,ffffffff823a6610,ffff80002d57a400) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff80002d57a1f0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd806e67ca80,ffff80002d57a400,0,fffffd807f7d3410) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806c020ab0,ffff80002d57a400,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000ffff1468,4,ffff80002d57a400,0,ffff80002d57a4c0) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff8000ffff1468,ffff80002d57a570,ffff80002d57a4c0) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff80002d57a570) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff80002d57a570) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x808413dc460, 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(ffffffff835fcbe0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835fcbe0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 reaper(ffff800029fd8008) at reaper+0x24b sys/kern/kern_exit.c:478 end trace frame: 0x0, count: -5