witness: lock order reversal: 1st 0xfffffd8066814f20 vmmaplk (&map->lock) 2nd 0xfffffd80667ac810 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd80667ac810,9,0) at witness_checkorder+0x1047 rw_enter(fffffd80667ac800,1) at rw_enter+0x122 rrw_enter(fffffd80667ac800,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd80690c5030,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd80690c5030,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd80690c5030,ffff800011a26200,e2,0,1,95c90ab491896d5b,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd805f1bc488) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff8210a140,2902,8000,ffffffff81005cc0,ffff80002d56fe60) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff80002d56fc50) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd806e089de0,ffff80002d56fe60,0,fffffd807f7d3410) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd805f78c098,ffff80002d56fe60,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff80002a0ea550,4,ffff80002d56fe60,0,ffff80002d56ff20) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff80002a0ea550,ffff80002d56ffd0,ffff80002d56ff20) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff80002d56ffd0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff80002d56ffd0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xef188b14c90, count: -16 ddb{1}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff80002d56f710 rbx 0xfffffd80042c71b8 rdx 0xffff8000012a45c0 rcx 0xffff80002a0ea550 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff80002d56f5f0 r9 0x8080808080808080 r10 0x186f4a27982f821c r11 0xdf5ebc617de0334c r12 0 r13 0xfffffd8003adee00 r14 0x3 r15 0xffffffff rip 0xffffffff81ac00e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002d56f700 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=339710 pid=45522 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=0xffff80002a0ea040,0xffff80002a0eacf8 process=0xffff800037280000 user=0xffff80002d56b000, vmspace=0xfffffd8066814e28 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 99086 168403 57723 0 2 0 syz-executor 99086 234886 57723 0 3 0x4000080 fsleep syz-executor 99086 182189 57723 0 3 0x4000080 fsleep syz-executor 99086 424350 57723 0 3 0x4000080 fsleep syz-executor 81382 474490 63264 0 2 0 syz-executor 81382 387874 63264 0 3 0x4000080 fsleep syz-executor 45522 404408 37399 0 2 0 syz-executor *45522 339710 37399 0 7 0x4000000 syz-executor 63811 99962 63383 0 2 0 syz-executor 63811 231345 63383 0 3 0x4000080 fsleep syz-executor 63811 61175 63383 0 3 0x4000080 fsleep syz-executor 64250 70020 0 0 3 0x14200 acct acct 76740 11795 0 0 3 0x14280 nfsidl nfsio 55695 230344 0 0 3 0x14280 nfsidl nfsio 26219 115479 0 0 3 0x14280 nfsidl nfsio 78693 145638 0 0 3 0x14280 nfsidl nfsio 99924 252393 0 0 3 0x14280 nfsidl nfsio 12193 211765 0 0 3 0x14280 nfsidl nfsio 36129 375216 0 0 3 0x14280 nfsidl nfsio 68931 218381 0 0 3 0x14280 nfsidl nfsio 54473 379972 0 0 3 0x14280 nfsidl nfsio 88252 162754 0 0 3 0x14280 nfsidl nfsio 97608 71972 0 0 3 0x14280 nfsidl nfsio 25185 129218 0 0 3 0x14280 nfsidl nfsio 86063 252809 0 0 3 0x14280 nfsidl nfsio 416 342780 0 0 3 0x14280 nfsidl nfsio 80908 191501 0 0 3 0x14280 nfsidl nfsio 75343 519635 0 0 3 0x14280 nfsidl nfsio 55690 38092 0 0 3 0x14280 nfsidl nfsio 26702 463177 0 0 3 0x14280 nfsidl nfsio 50832 415738 0 0 3 0x14280 nfsidl nfsio 59817 484808 0 0 3 0x14280 nfsidl nfsio 59523 128905 1 0 3 0x100083 ttyin getty 96344 510192 0 0 3 0x14200 bored sosplice 71488 398324 74738 0 3 0x100082 sbwait arp 74738 298724 18111 0 3 0x10008a sigsusp sh 88998 136747 7639 0 3 0x100082 sbwait arp 7639 266742 77341 0 3 0x10008a sigsusp sh 83713 369847 55136 0 3 0x82 nanoslp syz-executor 63264 362017 55136 0 3 0x82 nanoslp syz-executor 63383 251918 55136 0 3 0x82 nanoslp syz-executor 57723 396099 55136 0 3 0x82 nanoslp syz-executor 20364 391229 55136 0 3 0x82 nanoslp syz-executor 37399 324102 55136 0 3 0x82 nanoslp syz-executor 18111 502744 55136 0 3 0x82 wait syz-executor 77341 321363 55136 0 3 0x82 wait syz-executor 55136 198764 99783 0 3 0x82 kqread syz-executor 99783 313732 60747 0 3 0x10008a sigsusp ksh 60747 387143 13247 0 3 0x98 kqread sshd-session 13247 54757 4227 0 3 0x92 kqread sshd-session 4227 463126 1 0 3 0x88 kqread sshd 76261 106870 56292 74 3 0x1100092 bpf pflogd 56292 172740 1 0 3 0x80 sbwait pflogd 5379 118157 19516 73 3 0x1100090 kqread syslogd 19516 264638 1 0 3 0x100082 sbwait syslogd 58052 423848 1 0 3 0x100080 kqread resolvd 63547 356115 95617 77 3 0x100092 kqread dhcpleased 26905 489260 95617 77 3 0x100092 kqread dhcpleased 95617 137599 1 0 3 0x80 kqread dhcpleased 53047 516324 0 0 3 0x14200 bored smr 49163 209710 0 0 2 0x14200 zerothread 71735 469707 0 0 3 0x14200 aiodoned aiodoned 92730 410868 0 0 3 0x14200 syncer update 62724 92744 0 0 3 0x14200 cleaner cleaner 34450 13936 0 0 7 0x14200 reaper 9156 361204 0 0 3 0x14200 pgdaemon pagedaemon 10330 33226 0 0 3 0x14200 bored viomb 96378 124942 0 0 3 0x40014200 acpi0 acpi0 48476 199446 0 0 3 0x40014200 idle1 76710 316458 0 0 3 0x14200 bored softnet3 16593 441368 0 0 3 0x14200 bored softnet2 26995 321780 0 0 3 0x14200 bored softnet1 55662 337682 0 0 3 0x14200 bored softnet0 58848 307166 0 0 3 0x14200 bored systqmp 26613 97459 0 0 3 0x14200 bored systq 60035 98382 0 0 3 0x14200 tmoslp softclockmp 93892 340984 0 0 3 0x40014200 tmoslp softclock 83524 331652 0 0 3 0x40014200 idle0 1 126464 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 45522 (syz-executor) thread 0xffff80002a0ea550 (339710) shared rwlock vmmaplk r = 0 (0xfffffd8066814f20) #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 (0xffffffff835a0b68) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10219 11125K 11445K 166960K 12439 0 pcb 17 16K 18K 166960K 184 0 rtable 149 4K 7K 166960K 396 0 pf 33 17K 18K 166960K 61 0 ifaddr 30 4K 6K 166960K 52 0 ifgroup 47 2K 2K 166960K 65 0 sysctl 4 1K 1K 166960K 7 0 counters 60 35K 36K 166960K 74 0 ioctlops 0 0K 4K 166960K 1569 0 iov 0 0K 16K 166960K 121 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1418 89K 90K 166960K 2080 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 19 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 31 0 dirhash 12 2K 2K 166960K 48 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 19 69K 89K 166960K 1011 0 sigio 0 0K 0K 166960K 18 0 proc 72 91K 128K 166960K 599 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 113 0 in_multi 57 4K 6K 166960K 118 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 533 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 242 73K 87K 166960K 11283 0 UVM aobj 35 6K 6K 166960K 40 0 pinsyscall 46 92K 102K 166960K 2130 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 0K 166960K 40 0 NDP 10 0K 1K 166960K 33 0 temp 67 6824K 6949K 166960K 37184 0 kqueue 15 24K 30K 166960K 199 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 92 1 0 1 1 0 8 0 rtentry 112 119 0 53 3 0 3 3 0 8 0 unpcb 144 519 0 501 2 1 1 2 0 8 0 syncache 336 10 0 10 5 4 1 1 0 8 1 tcpqe 32 2 0 2 2 1 1 1 0 8 1 tcpcb 808 304 0 296 7 5 2 4 0 8 1 arp 120 21 0 8 1 0 1 1 0 8 0 inpcb 336 1271 0 1257 19 9 10 13 0 8 8 nd6 136 25 0 9 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 5 0 5 2 2 0 1 0 8 0 pffrag 232 25 0 19 1 0 1 1 0 482 0 pffrnode 88 25 0 19 1 0 1 1 0 8 0 pffrent 40 121 0 115 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 75 0 26 1 0 1 1 0 8 0 pfstkey 128 81 0 32 2 0 2 2 0 8 0 pfstate 376 76 0 29 6 0 6 6 0 8 0 pfrule 1344 24 0 17 2 0 2 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 523 0 211 26 3 23 26 0 8 1 art_table 32 525 0 211 4 0 4 4 0 8 0 art_node 16 117 0 59 1 0 1 1 0 8 0 sysvmsgpl 40 77 0 75 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 28 0 18 1 0 1 1 0 8 0 shmpl 112 37 0 5 1 0 1 1 0 8 0 dirhash 1024 41 0 24 3 0 3 3 0 8 0 dino2pl 256 3195 0 1702 95 0 95 95 0 8 0 ffsino 272 3195 0 1702 101 0 101 101 0 8 0 nchpl 144 4642 0 2959 63 0 63 63 0 8 0 uvmvnodes 80 3750 0 0 77 0 77 77 0 8 0 vnodes 216 3750 0 0 209 0 209 209 0 8 0 namei 1024 15917 0 15917 2 1 1 2 0 8 1 percpumem 16 51 0 7 1 0 1 1 0 8 0 kstatmem 264 34 0 14 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 13665 0 13665 12 11 1 8 1 8 1 plimitpl 152 275 0 258 1 0 1 1 0 8 0 sigapl 424 1349 0 1275 10 1 9 9 0 8 0 futexpl 64 13012 0 13006 1 0 1 1 0 8 0 knotepl 120 553 0 0 17 0 17 17 0 8 0 kqueuepl 216 383 0 371 5 4 1 5 0 8 0 pipepl 320 264 0 237 9 1 8 8 0 8 5 fdescpl 496 1308 0 1275 5 0 5 5 0 8 0 filepl 152 7816 0 7563 23 6 17 17 0 8 6 lockfpl 104 336 0 333 1 0 1 1 0 8 0 lockfspl 48 136 0 133 1 0 1 1 0 8 0 sessionpl 144 30 0 21 1 0 1 1 0 8 0 pgrppl 48 48 0 31 1 0 1 1 0 8 0 ucredpl 104 1185 0 1171 1 0 1 1 0 8 0 zombiepl 144 1277 0 1275 1 0 1 1 0 8 0 processpl 1160 1349 0 1275 6 0 6 6 0 8 0 procpl 648 2801 0 2720 9 1 8 8 0 8 0 srpgc 96 4 0 4 1 1 0 1 0 8 0 sosppl 168 7 0 7 3 2 1 1 0 8 1 sockpl 664 1904 0 1868 21 10 11 15 0 8 8 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 8 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 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 132 0 0 17 0 17 17 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 34 0 0 5 0 5 5 0 8 0 mtagpl 96 79 0 0 2 0 2 2 0 8 0 mbufpl 256 289 0 0 18 0 18 18 0 8 0 bufpl 280 3969 0 110 276 0 276 276 0 8 0 anonpl 24 263627 0 259919 52 10 42 48 0 185 14 amapchunkpl 152 38275 0 37783 37 10 27 31 0 158 5 amappl16 200 7258 0 7231 27 21 6 14 0 8 3 amappl15 192 9 0 9 2 2 0 1 0 8 0 amappl14 184 135 0 121 1 0 1 1 0 8 0 amappl13 176 10 0 10 2 2 0 1 0 8 0 amappl12 168 1964 0 1929 3 1 2 2 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 16 0 16 1 1 0 1 0 8 0 amappl9 144 130 0 130 1 1 0 1 0 8 0 amappl8 136 44 0 41 1 0 1 1 0 8 0 amappl7 128 130 0 116 1 0 1 1 0 8 0 amappl6 120 164 0 161 1 0 1 1 0 8 0 amappl5 112 159 0 147 1 0 1 1 0 8 0 amappl4 104 340 0 319 1 0 1 1 0 8 0 amappl3 96 6878 0 6779 3 0 3 3 0 8 0 amappl2 88 1649 0 1559 3 0 3 3 0 8 0 amappl1 80 11721 0 11101 15 0 15 15 0 8 0 amappl 88 10801 0 10628 5 0 5 5 0 92 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 8 0 8 2 2 0 1 0 8 0 dma128 128 253 0 253 1 1 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 39 0 5 1 0 1 1 0 8 0 uaddrrnd 24 1308 0 1275 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1308 0 1275 1 0 1 1 0 8 0 vmmpekpl 168 11846 0 11805 3 0 3 3 0 8 0 vmmpepl 168 89924 0 87997 104 11 93 101 0 357 3 vmsppl 448 1307 0 1275 6 1 5 5 0 8 0 rwobjpl 56 32185 0 27378 69 0 69 69 0 8 0 pdppl 4096 2623 0 2550 107 30 77 83 0 8 4 pvpl 32 16058 0 0 131 1 130 130 0 265 0 pmappl 248 1307 0 1275 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 422 0 58 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff834f2ff0) 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(ffffffff835a0960) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835a0960) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff800029fe4e00,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff835a0960) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835a0960) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff800029fe4f60,ffff800000079e00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge25_untramp() at Xintr_ioapic_edge25_untramp+0x18f __mp_lock(ffffffff835a0960) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835a0960) at __mp_lock+0x192 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff835a0960) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835a0960) at __mp_lock+0x192 sys/kern/kern_lock.c:144 reaper(ffff800029fd8f38) at reaper+0x24b sys/kern/kern_exit.c:478 end trace frame: 0x0, count: -14 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd80667ac810,9,0) at witness_checkorder+0x1047 rw_enter(fffffd80667ac800,1) at rw_enter+0x122 rrw_enter(fffffd80667ac800,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd80690c5030,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd80690c5030,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd80690c5030,ffff800011a26200,e2,0,1,95c90ab491896d5b,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd805f1bc488) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff8210a140,2902,8000,ffffffff81005cc0,ffff80002d56fe60) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff80002d56fc50) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd806e089de0,ffff80002d56fe60,0,fffffd807f7d3410) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd805f78c098,ffff80002d56fe60,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff80002a0ea550,4,ffff80002d56fe60,0,ffff80002d56ff20) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff80002a0ea550,ffff80002d56ffd0,ffff80002d56ff20) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff80002d56ffd0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff80002d56ffd0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xef188b14c90, count: -16