witness: lock order reversal: 1st 0xfffffd806bcdf820 vmmaplk (&map->lock) 2nd 0xfffffd806dde73c8 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(fffffd806dde73c8,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806dde73b8,1) at rw_enter+0x122 rrw_enter(fffffd806dde73b8,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8068c6b200,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8068c6b200,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd8068c6b200,ffff800011a26140,2d,0,1,a50eff2262fe1ae2,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd80785c0138) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff811845e0,2902,8000,ffffffff81612050,ffff80003728a868) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff80003728a6d0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd8072c18eb8,ffff80003728a868,0,fffffd807f7d3548) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806bd4a7c8,ffff80003728a868,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff80002a0aa550,3,ffff80003728a868,0,ffff80003728a920) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_read(ffff80002a0aa550,ffff80003728a9d0,ffff80003728a920) at sys_read+0xa2 sys/kern/sys_generic.c:172 syscall(ffff80003728a9d0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff80003728a9d0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdc2ba803ef0, count: -16 ddb{0}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff80003728a190 rbx 0xfffffd80042c1690 rdx 0xffff8000012b0580 rcx 0xffff80002a0aa550 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff80003728a070 r9 0x8080808080808080 r10 0xf756c40bbaaa3e09 r11 0xe0838d1948ffde80 r12 0 r13 0xfffffd8003ad9e00 r14 0x3 r15 0xffffffff rip 0xffffffff8292af95 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003728a180 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=359883 pid=18196 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=0xffff80002a0ab990,0xffffffff835620b0 process=0xffff8000fffed228 user=0xffff800037285000, vmspace=0xfffffd806bcdf728 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 18196 38802 91697 0 2 0 syz-executor *18196 359883 91697 0 7 0x4000000 syz-executor 19969 127189 13000 0 2 0 syz-executor 19969 283943 13000 0 3 0x4000080 fsleep syz-executor 61361 187988 62317 0 2 0 syz-executor 61361 513143 62317 0 3 0x4000080 fsleep syz-executor 87716 401808 48423 0 2 0 syz-executor 87716 179233 48423 0 2 0x4000000 syz-executor 90286 289486 35405 0 2 0 syz-executor 90286 450871 35405 0 2 0x4000000 syz-executor 41747 263826 56439 0 2 0 syz-executor 41747 277149 56439 0 3 0x4000080 fsleep syz-executor 41747 307107 56439 0 3 0x4000080 fsleep syz-executor 10669 416250 48365 0 3 0x80 nanoslp syz-executor 10669 448579 48365 0 3 0x4000080 pppxread syz-executor 10669 316701 48365 0 3 0x4000080 fsleep syz-executor 80003 109178 24728 0 3 0x80 nanoslp syz-executor 80003 21237 24728 0 3 0x4000080 ttyout syz-executor 80003 293670 24728 0 3 0x4000080 fsleep syz-executor 14100 36957 0 0 3 0x14280 nfsidl nfsio 11985 433196 0 0 3 0x14280 nfsidl nfsio 23692 421755 0 0 3 0x14280 nfsidl nfsio 69610 268700 0 0 3 0x14280 nfsidl nfsio 24996 26694 0 0 3 0x14280 nfsidl nfsio 93966 519871 0 0 3 0x14280 nfsidl nfsio 41070 83277 0 0 3 0x14280 nfsidl nfsio 16699 511730 0 0 3 0x14280 nfsidl nfsio 55998 224821 0 0 3 0x14280 nfsidl nfsio 82234 80854 0 0 3 0x14280 nfsidl nfsio 28991 80551 0 0 3 0x14280 nfsidl nfsio 43843 265005 0 0 3 0x14280 nfsidl nfsio 50219 354534 0 0 3 0x14280 nfsidl nfsio 66311 109451 0 0 3 0x14280 nfsidl nfsio 74929 74597 0 0 3 0x14280 nfsidl nfsio 20585 22877 0 0 3 0x14280 nfsidl nfsio 68393 522313 0 0 3 0x14280 nfsidl nfsio 67480 223038 0 0 3 0x14280 nfsidl nfsio 26794 144728 0 0 3 0x14280 nfsidl nfsio 72667 513982 0 0 3 0x14280 nfsidl nfsio 27163 125994 1 0 3 0x100083 ttyin getty 48365 196163 49277 0 2 0x2 syz-executor 35405 415849 49277 0 2 0x482 syz-executor 82101 275732 0 0 3 0x14200 bored sosplice 24728 30324 49277 0 3 0x82 nanoslp syz-executor 91697 283520 49277 0 2 0x2 syz-executor 62317 478648 49277 0 3 0x82 nanoslp syz-executor 56439 74905 49277 0 7 0x2 syz-executor 48423 144536 49277 0 3 0x82 nanoslp syz-executor 13000 253933 49277 0 3 0x82 nanoslp syz-executor 49277 185068 55582 0 3 0x82 kqread syz-executor 55582 342368 45522 0 3 0x10008a sigsusp ksh 45522 202576 897 0 3 0x98 kqread sshd-session 897 219196 44366 0 3 0x92 kqread sshd-session 44366 132167 1 0 3 0x88 kqread sshd 23535 36528 92540 74 3 0x1100092 bpf pflogd 92540 151117 1 0 3 0x80 sbwait pflogd 49800 272582 94737 73 3 0x1100090 kqread syslogd 94737 2390 1 0 3 0x100082 sbwait syslogd 10088 109319 1 0 3 0x100080 kqread resolvd 84071 199784 69315 77 3 0x100092 kqread dhcpleased 28537 152837 69315 77 3 0x100092 kqread dhcpleased 69315 388556 1 0 3 0x80 kqread dhcpleased 67678 322070 0 0 3 0x14200 bored smr 35339 428806 0 0 2 0x14200 zerothread 86283 218179 0 0 3 0x14200 aiodoned aiodoned 63715 518254 0 0 3 0x14200 syncer update 49866 211304 0 0 3 0x14200 cleaner cleaner 61300 18512 0 0 3 0x14200 reaper reaper 9939 146596 0 0 3 0x14200 pgdaemon pagedaemon 63261 34183 0 0 3 0x14200 bored viomb 94776 157553 0 0 3 0x40014200 acpi0 acpi0 24533 104986 0 0 3 0x40014200 idle1 50401 343846 0 0 3 0x14200 bored softnet3 64881 365131 0 0 3 0x14200 bored softnet2 87945 520346 0 0 3 0x14200 bored softnet1 15573 145428 0 0 3 0x14200 bored softnet0 74455 57958 0 0 3 0x14200 bored systqmp 3944 4605 0 0 3 0x14200 bored systq 68231 370400 0 0 3 0x14200 tmoslp softclockmp 9696 165146 0 0 2 0x40014200 softclock 13723 387257 0 0 3 0x40014200 idle0 1 114924 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 18196 (syz-executor) thread 0xffff80002a0aa550 (359883) shared rwlock vmmaplk r = 0 (0xfffffd806bcdf820) #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 (0xffffffff83561540) #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10231 11140K 12057K 166960K 13798 0 pcb 17 19K 21K 166960K 530 0 rtable 162 5K 8K 166960K 630 0 pf 38 18K 19K 166960K 126 0 ifaddr 36 6K 8K 166960K 89 0 ifgroup 60 2K 2K 166960K 145 0 sysctl 4 1K 3K 166960K 6 0 counters 66 36K 36K 166960K 118 0 ioctlops 0 0K 4K 166960K 1604 0 iov 0 0K 28K 166960K 93 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1517 95K 96K 166960K 2899 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 36 0 VM map 2 1K 1K 166960K 2 0 sem 22 17K 17K 166960K 258 0 dirhash 12 2K 2K 166960K 45 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 93K 166960K 1771 0 sigio 0 0K 0K 166960K 37 0 proc 72 91K 140K 166960K 746 0 subproc 104 6K 6K 166960K 130 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 204 0 in_multi 66 5K 7K 166960K 196 0 ether_multi 1 0K 0K 166960K 10 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 580 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 247 73K 91K 166960K 18477 0 UVM aobj 77 5K 5K 166960K 84 0 pinsyscall 43 86K 106K 166960K 2931 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 163 0 NDP 13 0K 2K 166960K 62 0 temp 76 6828K 6952K 166960K 80534 0 kqueue 13 20K 28K 166960K 287 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 120 281 0 278 4 2 2 3 0 8 1 rtentry 112 205 0 136 4 0 4 4 0 8 0 unpcb 144 1482 0 1461 17 15 2 6 0 8 1 syncache 336 10 0 10 3 3 0 1 0 8 0 tcpqe 32 5 0 5 2 2 0 1 0 8 0 tcpcb 808 608 0 599 17 15 2 14 0 8 0 arp 120 32 0 18 1 0 1 1 0 8 0 inpcb 336 2348 0 2335 26 23 3 13 0 8 0 nd6 136 40 0 21 2 0 2 2 0 8 0 pkpcb 40 4 0 4 4 4 0 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1168 13 0 13 3 3 0 1 0 8 0 pfstscr 40 4 0 3 1 0 1 1 0 8 0 pffrag 232 11 0 2 1 0 1 1 0 482 0 pffrnode 88 11 0 2 1 0 1 1 0 8 0 pffrent 40 17 0 8 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 24 134 0 38 1 0 1 1 0 8 0 pfstkey 128 137 0 41 4 0 4 4 0 8 0 pfstate 376 135 0 40 10 0 10 10 0 8 0 pfrule 1344 23 0 17 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 594 0 286 30 5 25 30 0 8 0 art_table 32 595 0 286 4 0 4 4 0 8 0 art_node 16 167 0 108 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semapl 112 252 0 232 1 0 1 1 0 8 0 shmpl 112 81 0 7 3 0 3 3 0 8 0 dirhash 1024 40 0 23 3 0 3 3 0 8 0 dino2pl 256 4537 0 3032 95 0 95 95 0 8 0 ffsino 272 4537 0 3032 101 0 101 101 0 8 0 nchpl 144 7092 0 6492 64 39 25 64 0 8 0 uvmvnodes 80 5621 0 0 115 0 115 115 0 8 0 vnodes 216 5621 0 0 313 0 313 313 0 8 0 namei 1024 24816 0 24816 7 6 1 2 0 8 1 percpumem 16 73 0 26 1 0 1 1 0 8 0 kstatmem 264 78 0 52 2 0 2 2 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 6 0 6 2 2 0 1 0 8 0 scxspl 216 30887 0 30887 15 14 1 8 1 8 1 plimitpl 152 506 0 489 1 0 1 1 0 8 0 sigapl 424 2095 0 2024 10 1 9 9 0 8 0 futexpl 64 25127 0 25121 1 0 1 1 0 8 0 knotepl 120 560 0 0 17 0 17 17 0 8 0 kqueuepl 216 484 0 475 3 2 1 3 0 8 0 pipepl 320 505 0 478 3 0 3 3 0 8 0 fdescpl 496 2055 0 2023 6 1 5 5 0 8 0 filepl 152 14557 0 14305 28 15 13 18 0 8 1 lockfpl 104 668 0 666 2 1 1 2 0 8 0 lockfspl 48 278 0 276 1 0 1 1 0 8 0 sessionpl 144 32 0 23 1 0 1 1 0 8 0 pgrppl 48 200 0 183 1 0 1 1 0 8 0 ucredpl 104 2302 0 2288 1 0 1 1 0 8 0 zombiepl 144 2110 0 2110 4 3 1 1 0 8 1 processpl 1160 2095 0 2024 7 1 6 6 0 8 0 procpl 648 4878 0 4796 9 1 8 8 0 8 0 srpgc 96 8 0 8 3 3 0 1 0 8 0 sosppl 168 12 0 12 3 3 0 1 0 8 0 sockpl 664 4143 0 4106 34 25 9 15 0 8 4 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 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 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 153 0 0 20 0 20 20 0 8 0 mcl2k 2048 30 0 0 3 0 3 3 0 8 0 mtagpl 96 157 0 0 4 0 4 4 0 8 0 mbufpl 256 375 0 0 24 0 24 24 0 8 0 bufpl 280 7929 0 1754 442 0 442 442 0 8 0 anonpl 24 314635 0 309475 168 87 81 85 0 185 35 amapchunkpl 152 60961 0 60377 52 24 28 34 0 158 2 amappl16 200 7300 0 7239 80 64 16 29 0 8 11 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 132 0 120 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 2734 0 2702 3 1 2 2 0 8 0 amappl11 160 56 0 42 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 1 0 1 0 8 0 amappl9 144 130 0 130 1 1 0 1 0 8 0 amappl8 136 23 0 19 1 0 1 1 0 8 0 amappl7 128 119 0 106 1 0 1 1 0 8 0 amappl6 120 192 0 190 1 0 1 1 0 8 0 amappl5 112 168 0 155 1 0 1 1 0 8 0 amappl4 104 342 0 322 1 0 1 1 0 8 0 amappl3 96 11310 0 11211 3 0 3 3 0 8 0 amappl2 88 2408 0 2321 3 0 3 3 0 8 0 amappl1 80 14287 0 13723 15 1 14 14 0 8 0 amappl 88 17843 0 17659 6 1 5 5 0 92 0 dma65536 65536 1 0 1 1 1 0 1 0 8 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 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 257 0 257 3 3 0 1 0 8 0 dma64 64 8 0 8 2 2 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 83 0 7 2 0 2 2 0 8 0 uaddrrnd 24 2055 0 2023 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2055 0 2023 1 0 1 1 0 8 0 vmmpekpl 168 17864 0 17814 3 0 3 3 0 8 0 vmmpepl 168 132223 0 130269 135 31 104 108 0 357 13 vmsppl 448 2054 0 2023 6 2 4 5 0 8 0 rwobjpl 56 42367 0 35697 104 5 99 99 0 8 2 pdppl 4096 4117 0 4046 117 46 71 85 0 8 0 pvpl 32 32916 0 0 267 1 266 266 0 265 0 pmappl 248 2054 0 2023 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 465 0 108 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(fffffd806dde73c8,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806dde73b8,1) at rw_enter+0x122 rrw_enter(fffffd806dde73b8,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8068c6b200,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8068c6b200,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd8068c6b200,ffff800011a26140,2d,0,1,a50eff2262fe1ae2,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd80785c0138) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff811845e0,2902,8000,ffffffff81612050,ffff80003728a868) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff80003728a6d0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd8072c18eb8,ffff80003728a868,0,fffffd807f7d3548) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806bd4a7c8,ffff80003728a868,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff80002a0aa550,3,ffff80003728a868,0,ffff80003728a920) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_read(ffff80002a0aa550,ffff80003728a9d0,ffff80003728a920) at sys_read+0xa2 sys/kern/sys_generic.c:172 syscall(ffff80003728a9d0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff80003728a9d0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdc2ba803ef0, 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(ffffffff83561338) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83561338) at __mp_lock+0x192 sys/kern/kern_lock.c:144 syscall(ffff80002a0f6930) at syscall+0xa11 mi_syscall_return sys/sys/syscall_mi.h:206 [inline] syscall(ffff80002a0f6930) at syscall+0xa11 sys/arch/amd64/amd64/trap.c:598 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d1e241972b0, count: -6