witness: lock order reversal: 1st 0xfffffd806bee82e0 vmmaplk (&map->lock) 2nd 0xfffffd806de665e8 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_read+0xa2 sys/kern/sys_generic.c:172 #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(fffffd806de665e8,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806de665d8,1) at rw_enter+0x122 rrw_enter(fffffd806de665d8,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8063d55bf0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8063d55bf0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd8063d55bf0,ffff800011a26140,df,0,1,7e5fe516c02c9ae0,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd805e29f148) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff82a27880,2902,8000,ffffffff81d8fc90,ffff8000371f2248) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff8000371f20b0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd80746d8eb8,ffff8000371f2248,0,fffffd807f7d3138) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806c038850,ffff8000371f2248,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000ffff1470,3,ffff8000371f2248,0,ffff8000371f2300) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_read(ffff8000ffff1470,ffff8000371f23b0,ffff8000371f2300) at sys_read+0xa2 sys/kern/sys_generic.c:172 syscall(ffff8000371f23b0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000371f23b0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6dea77673f0, count: -16 ddb{0}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff8000371f1b70 rbx 0xfffffd80042c7350 rdx 0xffff8000012b70c0 rcx 0xffff8000ffff1470 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff8000371f1a50 r9 0x8080808080808080 r10 0xe7619802fed5dc0c r11 0xdee14c75f92f6bd0 r12 0 r13 0xfffffd8003adee00 r14 0x3 r15 0xffffffff rip 0xffffffff81325f45 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000371f1b60 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=12413 pid=26530 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff07c8,0xffffffff8361ed48 process=0xffff8000fffea8c8 user=0xffff8000371ed000, vmspace=0xfffffd806bee81e8 estcpu=34, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 26530 258953 39653 0 2 0 syz-executor *26530 12413 39653 0 7 0x4000000 syz-executor 83971 464400 83861 0 2 0 syz-executor 83971 502320 83861 0 3 0x4000080 fsleep syz-executor 50303 521453 88459 0 2 0 syz-executor 50303 451301 88459 0 3 0x4000080 rest syz-executor 50303 520903 88459 0 2 0x4000000 syz-executor 22697 83632 75076 0 2 0x480 syz-executor 22697 176140 75076 0 3 0x4000080 kqread syz-executor 22697 347924 75076 0 3 0x4000080 fsleep syz-executor 66432 196569 57710 0 2 0 syz-executor 66432 101214 57710 0 3 0x4000080 fsleep syz-executor 66432 23301 57710 0 3 0x4000080 fsleep syz-executor 66432 323433 57710 0 3 0x4000080 fsleep syz-executor 24566 233341 1 0 3 0x80 nanoslp init 39653 417804 17182 0 3 0x82 nanoslp syz-executor 75076 337241 17182 0 2 0x482 syz-executor 57710 96565 17182 0 2 0x482 syz-executor 88459 430238 17182 0 3 0x82 nanoslp syz-executor 19395 347212 17182 0 2 0x482 syz-executor 1059 138812 32142 0 3 0x82 netio sshd-session 38026 227986 32142 0 3 0x82 netio sshd-session 94031 317880 17182 0 2 0x2 syz-executor 62667 475991 0 0 3 0x14200 bored sosplice 77711 518931 17709 0 3 0x100082 sbwait ndp 17709 470875 1 0 3 0x10008a sigsusp sh 83861 513032 17182 0 3 0x82 nanoslp syz-executor 2885 257088 17182 0 3 0x82 nanoslp syz-executor 17182 481481 77757 0 3 0x82 kqread syz-executor 77757 117878 61061 0 3 0x10008a sigsusp ksh 61061 405981 66458 0 3 0x98 kqread sshd-session 66458 450589 32142 0 3 0x92 kqread sshd-session 32142 314899 1 0 3 0x88 kqread sshd 87081 196224 6009 74 3 0x1100092 bpf pflogd 6009 457668 1 0 3 0x80 sbwait pflogd 61776 100202 73618 73 3 0x1100090 kqread syslogd 73618 132440 1 0 3 0x100082 sbwait syslogd 12038 521895 1 0 3 0x100080 kqread resolvd 14744 441862 39078 77 3 0x100092 kqread dhcpleased 39799 166999 39078 77 3 0x100092 kqread dhcpleased 39078 170295 1 0 3 0x80 kqread dhcpleased 860 131848 0 0 3 0x14200 bored smr 77640 474965 0 0 2 0x14200 zerothread 3948 63319 0 0 3 0x14200 aiodoned aiodoned 74294 484477 0 0 3 0x14200 syncer update 23190 111301 0 0 3 0x14200 cleaner cleaner 12064 339241 0 0 3 0x14200 reaper reaper 96532 495525 0 0 3 0x14200 pgdaemon pagedaemon 63617 31945 0 0 3 0x14200 bored viomb 41431 431627 0 0 3 0x40014200 acpi0 acpi0 47572 446842 0 0 7 0x40014200 idle1 85634 328098 0 0 3 0x14200 bored softnet3 7697 181431 0 0 3 0x14200 bored softnet2 99303 209403 0 0 3 0x14200 bored softnet1 90267 475216 0 0 3 0x14200 bored softnet0 55521 197278 0 0 2 0x14200 systqmp 65149 210655 0 0 3 0x14200 bored systq 41757 32993 0 0 3 0x14200 tmoslp softclockmp 74785 260707 0 0 2 0x40014200 softclock 94881 419963 0 0 3 0x40014200 idle0 1 59961 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 26530 (syz-executor) thread 0xffff8000ffff1470 (12413) shared rwlock vmmaplk r = 0 (0xfffffd806bee82e0) #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_read+0xa2 sys/kern/sys_generic.c:172 #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 (0xffffffff83623fc8) #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_read+0xa2 sys/kern/sys_generic.c:172 #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 94031 (syz-executor) thread 0xffff80002a03e2a8 (317880) exclusive rrwlock inode r = 0 (0xfffffd806650a818) #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 (0xfffffd806d1d91b0) #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 10241 11217K 12666K 166960K 17519 0 pcb 17 17K 22K 166960K 1256 0 rtable 186 7K 8K 166960K 988 0 pf 48 20K 276K 166960K 242 0 ifaddr 40 6K 7K 166960K 127 0 ifgroup 68 2K 3K 166960K 176 0 sysctl 3 0K 0K 166960K 9 0 counters 70 37K 37K 166960K 138 0 ioctlops 0 0K 4K 166960K 2149 0 iov 0 0K 20K 166960K 412 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1625 102K 102K 166960K 5283 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 72 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 138 0 dirhash 12 2K 2K 166960K 84 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 19 69K 85K 166960K 3760 0 sigio 0 0K 0K 166960K 55 0 proc 63 79K 140K 166960K 1122 0 subproc 117 7K 7K 166960K 184 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 1232 0 in_multi 73 5K 7K 166960K 334 0 ether_multi 1 0K 0K 166960K 27 0 mrt 1 0K 0K 166960K 13 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 1522 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 273 75K 93K 166960K 36057 0 UVM aobj 41 8K 9K 166960K 46 0 pinsyscall 48 96K 104K 166960K 5144 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 331 0 NDP 15 0K 2K 166960K 90 0 temp 84 6828K 7084K 166960K 176745 0 kqueue 16 26K 32K 166960K 673 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 120 432 0 428 4 3 1 3 0 8 0 rtentry 112 267 0 187 4 0 4 4 0 8 0 unpcb 144 3341 0 3318 30 28 2 10 0 8 0 syncache 336 23 0 23 3 3 0 1 0 8 0 tcpqe 32 11 0 11 4 4 0 1 0 8 0 tcpcb 808 1397 0 1389 29 27 2 9 0 8 0 arp 120 46 0 31 1 0 1 1 0 8 0 inpcb 336 5690 0 5635 56 43 13 13 0 8 7 nd6 136 55 0 35 1 0 1 1 0 8 0 pkpcb 40 21 0 21 9 9 0 1 0 8 0 kcovpl 48 14 0 5 1 0 1 1 0 8 0 ppxss 1168 17 0 17 8 8 0 1 0 8 0 pfstscr 40 31 0 29 2 1 1 1 0 8 0 pffrag 232 19 0 10 1 0 1 1 0 482 0 pffrnode 88 15 0 8 1 0 1 1 0 8 0 pffrent 40 31 0 22 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 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 97 0 77 1 0 1 1 0 8 0 pfstkey 128 133 0 107 2 0 2 2 0 8 0 pfstate 376 111 0 94 6 1 5 6 0 8 0 pfrule 1344 34 0 27 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 1205 0 859 37 12 25 30 0 8 0 art_table 32 1208 0 859 4 0 4 4 0 8 0 art_node 16 256 0 190 1 0 1 1 0 8 0 sysvmsgpl 40 22 0 15 1 0 1 1 0 8 0 semapl 112 133 0 123 1 0 1 1 0 8 0 shmpl 112 43 0 5 2 0 2 2 0 8 0 dirhash 1024 67 0 50 3 0 3 3 0 8 0 dino2pl 256 8495 0 6981 96 0 96 96 0 8 0 ffsino 272 8495 0 6981 102 0 102 102 0 8 0 nchpl 144 13878 0 13269 64 40 24 63 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 51447 0 51446 6 5 1 1 0 8 0 percpumem 16 83 0 34 1 0 1 1 0 8 0 kstatmem 264 98 0 68 8 5 3 3 0 8 0 scsiplug 72 17 0 17 7 7 0 1 0 8 0 scxspl 216 40532 0 40532 23 21 2 8 1 8 2 plimitpl 152 893 0 876 1 0 1 1 0 8 0 sigapl 424 4112 0 4058 9 0 9 9 0 8 1 futexpl 64 58490 0 58485 1 0 1 1 0 8 0 knotepl 120 859 0 0 24 0 24 24 0 8 0 kqueuepl 216 1308 0 1296 13 12 1 5 0 8 0 pipepl 320 596 0 564 6 2 4 6 0 8 0 fdescpl 496 4066 0 4031 5 0 5 5 0 8 0 filepl 152 31718 0 31434 56 40 16 22 0 8 2 lockfpl 104 1671 0 1669 4 3 1 2 0 8 0 lockfspl 48 500 0 498 1 0 1 1 0 8 0 sessionpl 144 52 0 42 1 0 1 1 0 8 0 pgrppl 48 93 0 74 1 0 1 1 0 8 0 ucredpl 104 6042 0 6028 1 0 1 1 0 8 0 zombiepl 144 4060 0 4058 2 1 1 1 0 8 0 processpl 1160 4112 0 4058 6 0 6 6 0 8 1 procpl 648 9516 0 9453 8 0 8 8 0 8 0 srpgc 96 21 0 21 7 7 0 1 0 8 0 sosppl 168 35 0 35 12 11 1 1 0 8 1 sockpl 664 9589 0 9508 78 62 16 25 0 8 7 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 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 131 0 0 17 1 16 17 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 47 0 0 5 0 5 5 0 8 0 mtagpl 96 177 0 0 4 0 4 4 0 8 0 mbufpl 256 4529 0 0 283 0 283 283 0 8 0 bufpl 280 14176 0 8001 442 0 442 442 0 8 0 anonpl 24 534502 0 519169 180 64 116 116 0 185 0 amapchunkpl 152 118421 0 117772 65 37 28 36 0 158 0 amappl16 200 12925 0 12292 112 66 46 46 0 8 0 amappl15 192 27 0 27 2 2 0 1 0 8 0 amappl14 184 175 0 161 1 0 1 1 0 8 0 amappl13 176 11 0 11 4 4 0 1 0 8 0 amappl12 168 4846 0 4811 3 1 2 2 0 8 0 amappl11 160 78 0 64 1 0 1 1 0 8 0 amappl10 152 10 0 10 2 1 1 1 0 8 1 amappl9 144 141 0 141 1 1 0 1 0 8 0 amappl8 136 20 0 17 1 0 1 1 0 8 0 amappl7 128 145 0 130 1 0 1 1 0 8 0 amappl6 120 236 0 233 1 0 1 1 0 8 0 amappl5 112 183 0 168 1 0 1 1 0 8 0 amappl4 104 423 0 403 1 0 1 1 0 8 0 amappl3 96 22009 0 21903 4 0 4 4 0 8 0 amappl2 88 4597 0 4495 3 0 3 3 0 8 0 amappl1 80 24139 0 23395 20 3 17 18 0 8 0 amappl 88 35178 0 34978 6 0 6 6 0 92 0 dma65536 65536 4 0 4 2 2 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 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 128 260 0 260 7 7 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 45 0 5 1 0 1 1 0 8 0 uaddrrnd 24 4067 0 4032 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4067 0 4032 1 0 1 1 0 8 0 vmmpekpl 168 30637 0 30573 4 0 4 4 0 8 0 vmmpepl 168 254131 0 251316 172 38 134 134 0 357 0 vmsppl 448 4066 0 4032 6 1 5 5 0 8 0 rwobjpl 56 70411 0 62670 119 6 113 113 0 8 0 pdppl 4096 8141 0 8064 163 84 79 81 0 8 2 pvpl 32 27867 0 0 224 0 224 224 0 265 0 pmappl 248 4066 0 4032 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 826 0 189 19 0 19 19 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(fffffd806de665e8,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806de665d8,1) at rw_enter+0x122 rrw_enter(fffffd806de665d8,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8063d55bf0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8063d55bf0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd8063d55bf0,ffff800011a26140,df,0,1,7e5fe516c02c9ae0,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd805e29f148) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff82a27880,2902,8000,ffffffff81d8fc90,ffff8000371f2248) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff8000371f20b0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd80746d8eb8,ffff8000371f2248,0,fffffd807f7d3138) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806c038850,ffff8000371f2248,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000ffff1470,3,ffff8000371f2248,0,ffff8000371f2300) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_read(ffff8000ffff1470,ffff8000371f23b0,ffff8000371f2300) at sys_read+0xa2 sys/kern/sys_generic.c:172 syscall(ffff8000371f23b0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000371f23b0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6dea77673f0, 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