witness: lock order reversal: 1st 0xfffffd806bfd74a8 vmmaplk (&map->lock) 2nd 0xfffffd806fd60758 inode (&ip->i_lock) lock order [1] vmmaplk (&map->lock) -> [2] inode (&ip->i_lock) #0 rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 #1 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #2 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #3 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #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+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 lock order [2] inode (&ip->i_lock) -> [1] vmmaplk (&map->lock) #0 rw_do_enter_read+0x9d sys/kern/kern_rwlock.c:352 #1 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1864 #2 uvm_fault_check+0x4b sys/uvm/uvm_fault.c:732 #3 uvm_fault+0x106 sys/uvm/uvm_fault.c:668 #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+0xbd4 sys/kern/kern_exec.c:468 #14 start_init+0x3c6 sys/kern/init_main.c:716 #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(fffffd806fd60758,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806fd60740,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806fd60740,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd8078b9bda8,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8078b9bda8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_rdwr(0,fffffd8078b9bda8,ffff800011a26240,ff,0,1,ac1faf83aa47e928,0,ffff800000b2a000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd805d3016a0) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff814caab0,2902,8000,ffffffff813cd180,ffff800033576bf8) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff800033576a60) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd806fbddeb8,ffff800033576bf8,0,fffffd807f7d34e0) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd80635bd698,ffff800033576bf8,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000ffff8cc8,3,ffff800033576bf8,0,ffff800033576cb0) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_read(ffff8000ffff8cc8,ffff800033576d60,ffff800033576cb0) at sys_read+0xa2 sys/kern/sys_generic.c:172 syscall(ffff800033576d60) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800033576d60) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2e1718e1b0, count: -16 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800033576540 rbx 0xfffffd800433ba48 rdx 0 rcx 0xffff8000ffff8cc8 rax 0xffffffff834e3ff0 cpu_info_full_primary+0x1ff0 r8 0xffff800033576420 r9 0x8080808080808080 r10 0xafa35689a0500590 r11 0xdf3982be6c6668ed r12 0 r13 0xfffffd8003b53f00 r14 0x3 r15 0xffffffff rip 0xffffffff8239cdf5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800033576530 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=421953 pid=87346 tcnt=3 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=0xffff8000ffffaa30,0xffff8000ffff96f8 process=0xffff80003c5b1930 user=0xffff800033571000, vmspace=0xfffffd806bfd73a8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 6658 23804 51733 0 2 0 syz-executor 6658 192605 51733 0 2 0x4000080 syz-executor 87346 430135 77194 0 2 0 syz-executor *87346 421953 77194 0 7 0x4000000 syz-executor 87346 244506 77194 0 3 0x4000080 fsleep syz-executor 77166 134179 27152 0 2 0 syz-executor 77166 234003 27152 0 2 0x4000080 syz-executor 23234 214365 54575 -1 2 0x10 syz-executor 23234 351604 54575 -1 2 0x4000090 syz-executor 65089 157780 59608 0 3 0x80 nanoslp syz-executor 65089 64950 59608 0 3 0x4000080 ttyin syz-executor 65089 494926 59608 0 3 0x4000080 fsleep syz-executor 43953 298309 1 0 3 0x100083 ttyin getty 27152 328573 53549 0 3 0x82 nanoslp syz-executor 96828 268361 0 0 3 0x14200 bored sosplice 81788 189329 0 0 3 0x14200 acct acct 63560 340497 68597 0 3 0x100082 sbwait arp 68597 515762 23775 0 3 0x10008a sigsusp sh 59608 177505 53549 0 3 0x82 nanoslp syz-executor 23775 75660 53549 0 3 0x82 wait syz-executor 54575 7603 53549 0 3 0x82 nanoslp syz-executor 51733 331206 53549 0 2 0x2 syz-executor 91977 487728 53549 0 2 0x2 syz-executor 77194 478368 53549 0 2 0x2 syz-executor 35842 400909 53549 0 2 0x2 syz-executor 53549 155175 8871 0 3 0x82 kqread syz-executor 8871 458609 95388 0 3 0x10008a sigsusp ksh 95388 453057 99368 0 3 0x98 kqread sshd-session 99368 312951 48074 0 3 0x92 kqread sshd-session 48074 417643 1 0 3 0x88 kqread sshd 64043 376345 50731 74 3 0x1100092 bpf pflogd 50731 58015 1 0 3 0x80 sbwait pflogd 55723 414066 57466 73 3 0x1100090 kqread syslogd 57466 112033 1 0 3 0x100082 sbwait syslogd 94897 268213 1 0 3 0x100080 kqread resolvd 29908 377842 59317 77 3 0x100092 kqread dhcpleased 16179 86753 59317 77 3 0x100092 kqread dhcpleased 59317 122373 1 0 3 0x80 kqread dhcpleased 74242 377532 0 0 3 0x14200 bored smr 75773 284961 0 0 3 0x14200 pgzero zerothread 23732 265120 0 0 3 0x14200 aiodoned aiodoned 7279 416689 0 0 3 0x14200 syncer update 16171 521817 0 0 3 0x14200 cleaner cleaner 95475 239551 0 0 3 0x14200 reaper reaper 59881 124566 0 0 3 0x14200 pgdaemon pagedaemon 15790 394245 0 0 3 0x14200 bored viomb 89741 390837 0 0 3 0x40014200 acpi0 acpi0 72119 146553 0 0 7 0x40014200 idle1 54209 112692 0 0 3 0x14200 bored softnet3 40532 121711 0 0 3 0x14200 bored softnet2 26276 16064 0 0 3 0x14200 bored softnet1 65370 432148 0 0 3 0x14200 bored softnet0 12350 451479 0 0 3 0x14200 bored systqmp 99054 480700 0 0 3 0x14200 bored systq 4723 243245 0 0 3 0x14200 tmoslp softclockmp 36578 517305 0 0 3 0x40014200 tmoslp softclock 31577 518875 0 0 3 0x40014200 idle0 1 280733 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 87346 (syz-executor) thread 0xffff8000ffff8cc8 (421953) shared rwlock vmmaplk r = 0 (0xfffffd806bfd74a8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_read+0x3af sys/kern/kern_rwlock.c:405 #2 uvm_vslock_device+0x149 sys/uvm/uvm_glue.c:172 #3 physio+0x277 sys/kern/kern_physio.c:139 #4 spec_read+0x155 sys/kern/spec_vnops.c:215 #5 VOP_READ+0x102 sys/kern/vfs_vops.c:227 #6 vn_read+0x17b sys/kern/vfs_vnops.c:369 #7 dofilereadv+0x230 sys/kern/sys_generic.c:252 #8 sys_read+0xa2 sys/kern/sys_generic.c:172 #9 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #10 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff836710f8) #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+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #5 Xsyscall+0x128 Process 35842 (syz-executor) thread 0xffff80002a4171d0 (400909) exclusive rrwlock inode r = 0 (0xfffffd806dde8cc0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #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:3102 #10 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806d402878) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #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:3087 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10236 11101K 11360K 166960K 12579 0 pcb 17 15K 16K 166960K 293 0 rtable 189 6K 7K 166960K 471 0 pf 36 18K 21K 166960K 106 0 ifaddr 38 6K 7K 166960K 72 0 ifgroup 56 2K 2K 166960K 103 0 sysctl 4 1K 1K 166960K 6 0 counters 64 36K 36K 166960K 96 0 ioctlops 0 0K 4K 166960K 1634 0 iov 0 0K 20K 166960K 59 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1456 92K 92K 166960K 2160 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 13 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 45 0 dirhash 12 2K 2K 166960K 39 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 17 61K 93K 166960K 1071 0 sigio 0 0K 0K 166960K 20 0 proc 72 91K 128K 166960K 667 0 subproc 72 4K 4K 166960K 83 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 194 0 in_multi 71 5K 6K 166960K 145 0 ether_multi 1 0K 0K 166960K 7 0 mrt 1 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 247 1102K 1102K 166960K 247 0 exec 0 0K 1K 166960K 578 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 231 74K 87K 166960K 11634 0 UVM aobj 90 5K 5K 166960K 92 0 pinsyscall 43 86K 106K 166960K 2204 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 129 0 NDP 12 0K 1K 166960K 48 0 temp 80 6900K 7021K 166960K 67328 0 kqueue 13 20K 30K 166960K 184 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 120 108 0 104 1 0 1 1 0 8 0 rtentry 112 139 0 55 3 0 3 3 0 8 0 unpcb 144 660 0 643 5 4 1 4 0 8 0 syncache 336 10 0 10 3 2 1 1 0 8 1 tcpcb 808 382 0 377 12 4 8 8 0 8 7 arp 120 24 0 5 1 0 1 1 0 8 0 inpcb 376 1379 0 1365 21 11 10 15 0 8 8 nd6 136 28 0 9 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 1 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1168 10 0 10 3 2 1 1 0 8 1 pffrag 232 9 0 3 3 2 1 1 0 482 0 pffrnode 88 8 0 3 3 2 1 1 0 8 0 pffrent 40 56 0 50 3 2 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 2 0 2 2 2 0 1 0 8 0 pftag 88 2 0 2 2 2 0 1 0 8 0 pfstitem 24 70 0 20 1 0 1 1 0 8 0 pfstkey 128 70 0 20 2 0 2 2 0 8 0 pfstate 376 69 0 20 5 0 5 5 0 8 0 pfrule 1344 25 0 20 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 604 0 269 29 4 25 27 0 8 1 art_table 32 607 0 269 4 0 4 4 0 8 0 art_node 16 134 0 60 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 8 1 0 1 1 0 8 0 semapl 112 40 0 30 1 0 1 1 0 8 0 shmpl 112 89 0 2 3 0 3 3 0 8 0 dirhash 1024 35 0 18 3 0 3 3 0 8 0 dino2pl 256 3352 0 1849 95 0 95 95 0 8 0 ffsino 280 3352 0 1849 109 0 109 109 0 8 0 nchpl 144 4850 0 3158 63 0 63 63 0 8 0 uvmvnodes 80 3880 0 0 80 0 80 80 0 8 0 vnodes 216 3880 0 0 216 0 216 216 0 8 0 namei 1024 17069 0 17068 2 1 1 1 0 8 0 percpumem 16 62 0 16 1 0 1 1 0 8 0 kstatmem 264 56 0 32 2 0 2 2 0 8 0 scsiplug 72 8 0 8 3 2 1 1 0 8 1 scxspl 216 14731 0 14731 10 9 1 8 1 8 1 plimitpl 152 343 0 325 1 0 1 1 0 8 0 sigapl 424 1377 0 1326 7 0 7 7 0 8 0 futexpl 64 15193 0 15191 1 0 1 1 0 8 0 knotepl 120 587 0 0 18 0 18 18 0 8 0 kqueuepl 216 407 0 398 5 3 2 5 0 8 1 pipepl 328 262 0 235 8 0 8 8 0 8 5 fdescpl 504 1357 0 1326 5 0 5 5 0 8 0 filepl 152 8959 0 8739 21 5 16 17 0 8 5 lockfpl 104 443 0 441 1 0 1 1 0 8 0 lockfspl 48 156 0 154 1 0 1 1 0 8 0 sessionpl 144 31 0 22 1 0 1 1 0 8 0 pgrppl 48 54 0 37 1 0 1 1 0 8 0 ucredpl 104 1660 0 1645 1 0 1 1 0 8 0 zombiepl 144 1326 0 1326 2 1 1 1 0 8 1 processpl 1168 1377 0 1326 5 0 5 5 0 8 0 procpl 648 2874 0 2816 6 0 6 6 0 8 0 srpgc 96 8 0 8 2 1 1 1 0 8 1 sosppl 168 1 0 1 1 0 1 1 0 8 1 sockpl 688 2167 0 2136 19 7 12 15 0 8 8 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 8 0 0 1 0 1 1 0 8 0 mcl4k 4096 110 0 0 14 0 14 14 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 34 0 0 5 0 5 5 0 8 0 mtagpl 96 9 0 0 1 0 1 1 0 8 0 mbufpl 256 272 0 0 17 0 17 17 0 8 0 bufpl 280 4578 0 133 318 0 318 318 0 8 0 anonpl 24 242237 0 231058 109 26 83 83 0 185 0 amapchunkpl 152 39491 0 38786 39 9 30 30 0 158 0 amappl16 200 4552 0 4270 53 24 29 29 0 8 1 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 123 0 110 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 2009 0 1976 4 2 2 3 0 8 0 amappl11 160 52 0 38 1 0 1 1 0 8 0 amappl10 152 5 0 5 2 2 0 1 0 8 0 amappl9 144 250 0 250 2 2 0 1 0 8 0 amappl8 136 54 0 51 1 0 1 1 0 8 0 amappl7 128 147 0 134 1 0 1 1 0 8 0 amappl6 120 193 0 188 1 0 1 1 0 8 0 amappl5 112 140 0 130 1 0 1 1 0 8 0 amappl4 104 345 0 325 1 0 1 1 0 8 0 amappl3 96 7626 0 7513 5 1 4 4 0 8 0 amappl2 88 712 0 645 2 0 2 2 0 8 0 amappl1 80 12139 0 11543 16 1 15 15 0 8 0 amappl 88 11147 0 10975 5 0 5 5 0 92 0 dma65536 65536 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 dma2048 2048 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 7 0 7 2 2 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 91 0 2 2 0 2 2 0 8 0 uaddrrnd 24 1357 0 1326 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1357 0 1326 1 0 1 1 0 8 0 vmmpekpl 168 12654 0 12610 3 0 3 3 0 8 0 vmmpepl 168 89333 0 87219 117 9 108 108 0 357 1 vmsppl 456 1356 0 1326 5 0 5 5 0 8 0 rwobjpl 64 30096 0 24890 88 2 86 86 0 8 0 pdppl 4096 2721 0 2652 106 33 73 85 0 8 4 pvpl 32 21166 0 0 172 1 171 171 0 265 0 pmappl 248 1356 0 1326 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 313 0 53 8 0 8 8 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(fffffd806fd60758,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806fd60740,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806fd60740,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd8078b9bda8,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8078b9bda8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_rdwr(0,fffffd8078b9bda8,ffff800011a26240,ff,0,1,ac1faf83aa47e928,0,ffff800000b2a000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd805d3016a0) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff814caab0,2902,8000,ffffffff813cd180,ffff800033576bf8) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff800033576a60) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd806fbddeb8,ffff800033576bf8,0,fffffd807f7d34e0) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd80635bd698,ffff800033576bf8,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000ffff8cc8,3,ffff800033576bf8,0,ffff800033576cb0) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_read(ffff8000ffff8cc8,ffff800033576d60,ffff800033576cb0) at sys_read+0xa2 sys/kern/sys_generic.c:172 syscall(ffff800033576d60) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800033576d60) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2e1718e1b0, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029b5bff0) 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(ffff800029b5bff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -5