witness: lock order reversal: 1st 0xfffffd80686b69d8 vmmaplk (&map->lock) 2nd 0xfffffd806bf544e0 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(fffffd806bf544e0,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806bf544d0,1) at rw_enter+0x122 rrw_enter(fffffd806bf544d0,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8062bd7710,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8062bd7710,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd8062bd7710,ffff800011a26140,df,0,1,7f586fc53e081d6a,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd8062d72d38) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff8131d350,2902,8000,ffffffff818b3880,ffff800030985ee8) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff800030985d50) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd806e70fde0,ffff800030985ee8,0,fffffd807f7d3138) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806bf984e0,ffff800030985ee8,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000371e7c00,3,ffff800030985ee8,0,ffff800030985fa0) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_read(ffff8000371e7c00,ffff800030986050,ffff800030985fa0) at sys_read+0xa2 sys/kern/sys_generic.c:172 syscall(ffff800030986050) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800030986050) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x64fbdf50b80, count: -16 ddb{0}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff800030985810 rbx 0xfffffd80042c7d78 rdx 0xffff8000012a4540 rcx 0xffff8000371e7c00 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff8000309856f0 r9 0x8080808080808080 r10 0x80f5c5e4d5842c54 r11 0x31cb5432dd80df8f r12 0 r13 0xfffffd8003adfe00 r14 0x3 r15 0xffffffff rip 0xffffffff817a0ea5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800030985800 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=88859 pid=47995 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000371e6028,0xffff8000371e71f0 process=0xffff8000ffff5fd0 user=0xffff800030981000, vmspace=0xfffffd80686b68e0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 77231 237274 33596 0 7 0 syz-executor 47995 372370 39659 0 2 0 syz-executor *47995 88859 39659 0 7 0x4000000 syz-executor 64561 74032 11619 0 2 0x480 syz-executor 64561 441394 11619 0 3 0x4000080 kqsel syz-executor 64561 283986 11619 0 3 0x4000080 fsleep syz-executor 71557 503590 0 0 3 0x14200 bored sosplice 99216 498711 39652 0 3 0x100082 sbwait arp 39652 55999 60024 0 3 0x10008a sigsusp sh 11619 355651 64904 0 3 0x82 nanoslp syz-executor 11983 217982 64904 0 3 0x82 wait syz-executor 42768 297041 64904 0 2 0x482 syz-executor 66581 442940 64904 0 2 0x2 syz-executor 79504 365208 64904 0 3 0x82 wait syz-executor 39659 446847 64904 0 2 0x482 syz-executor 33596 129803 64904 0 3 0x82 nanoslp syz-executor 60024 47646 64904 0 3 0x82 wait syz-executor 64904 79542 30718 0 3 0x82 kqread syz-executor 30718 510073 21850 0 3 0x10008a sigsusp ksh 21850 166825 80597 0 3 0x98 kqread sshd-session 80597 90358 32443 0 3 0x92 kqread sshd-session 42760 222650 1 0 3 0x100083 ttyin getty 32443 66127 1 0 3 0x88 kqread sshd 56782 150827 96132 74 3 0x1100092 bpf pflogd 96132 517500 1 0 3 0x80 sbwait pflogd 55676 323115 1754 73 3 0x1100090 kqread syslogd 1754 239050 1 0 3 0x100082 sbwait syslogd 99118 205350 1 0 3 0x100080 kqread resolvd 87219 391201 403 77 3 0x100092 kqread dhcpleased 70983 288418 403 77 3 0x100092 kqread dhcpleased 403 420230 1 0 3 0x80 kqread dhcpleased 6003 449853 0 0 3 0x14200 bored smr 18180 450717 0 0 3 0x14200 pgzero zerothread 23762 53748 0 0 3 0x14200 aiodoned aiodoned 12150 339898 0 0 3 0x14200 syncer update 65652 470344 0 0 3 0x14200 cleaner cleaner 59481 328368 0 0 3 0x14200 reaper reaper 13181 407743 0 0 3 0x14200 pgdaemon pagedaemon 16658 64385 0 0 3 0x14200 bored viomb 1296 507057 0 0 3 0x40014200 acpi0 acpi0 32391 214939 0 0 3 0x40014200 idle1 96720 443143 0 0 3 0x14200 bored softnet3 41251 272566 0 0 3 0x14200 bored softnet2 96232 330108 0 0 3 0x14200 bored softnet1 5380 70672 0 0 3 0x14200 bored softnet0 31783 187043 0 0 3 0x14200 bored systqmp 13060 373662 0 0 3 0x14200 bored systq 69903 451244 0 0 3 0x14200 tmoslp softclockmp 16571 508883 0 0 2 0x40014200 softclock 39556 520912 0 0 3 0x40014200 idle0 1 135075 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 47995 (syz-executor) thread 0xffff8000371e7c00 (88859) shared rwlock vmmaplk r = 0 (0xfffffd80686b69d8) #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 (0xffffffff8363b0f8) #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 66581 (syz-executor) thread 0xffff80002a051968 (442940) exclusive rrwlock inode r = 0 (0xfffffd806de4a708) #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 (0xfffffd806c4fb2b8) #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 10194 11113K 11437K 166960K 11878 0 pcb 17 12K 12K 166960K 69 0 rtable 227 6K 7K 166960K 359 0 pf 34 17K 20K 166960K 64 0 ifaddr 42 7K 7K 166960K 53 0 ifgroup 55 2K 2K 166960K 74 0 sysctl 3 0K 0K 166960K 5 0 counters 64 36K 36K 166960K 78 0 ioctlops 0 0K 4K 166960K 1507 0 iov 0 0K 13K 166960K 19 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1370 86K 86K 166960K 1596 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 11 0K 0K 166960K 19 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 93K 166960K 412 0 sigio 0 0K 0K 166960K 2 0 proc 72 91K 127K 166960K 553 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 35 0 in_multi 93 6K 6K 166960K 96 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 422 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 240 73K 77K 166960K 5449 0 UVM aobj 10 2K 2K 166960K 12 0 pinsyscall 44 88K 106K 166960K 1475 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 21 0 NDP 12 0K 1K 166960K 34 0 temp 43 6819K 6947K 166960K 19770 0 kqueue 13 20K 28K 166960K 83 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 120 122 0 118 3 0 3 3 0 8 2 rtentry 112 110 0 5 3 0 3 3 0 8 0 unpcb 144 166 0 149 1 0 1 1 0 8 0 syncache 336 3 0 3 2 2 0 1 0 8 0 tcpcb 808 84 0 80 2 0 2 2 0 8 1 arp 120 18 0 1 1 0 1 1 0 8 0 inpcb 336 307 0 300 2 0 2 2 0 8 1 nd6 136 23 0 1 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 6 0 6 1 0 1 1 0 8 1 pffrag 232 3 0 1 1 0 1 1 0 482 0 pffrnode 88 3 0 1 1 0 1 1 0 8 0 pffrent 40 5 0 3 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 47 0 1 1 0 1 1 0 8 0 pfstkey 128 47 0 1 2 0 2 2 0 8 0 pfstate 376 47 0 1 5 0 5 5 0 8 0 pfrule 1344 21 0 15 2 0 2 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 422 0 10 27 0 27 27 0 8 0 art_table 32 425 0 10 4 0 4 4 0 8 0 art_node 16 109 0 15 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 16 0 7 1 0 1 1 0 8 0 shmpl 112 9 0 2 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2097 0 592 95 0 95 95 0 8 0 ffsino 272 2097 0 592 101 0 101 101 0 8 0 nchpl 144 2677 0 995 63 0 63 63 0 8 0 uvmvnodes 80 2325 0 0 48 0 48 48 0 8 0 vnodes 216 2325 0 0 130 0 130 130 0 8 0 namei 1024 8433 0 8432 2 1 1 2 0 8 0 percpumem 16 53 0 7 1 0 1 1 0 8 0 kstatmem 264 38 0 14 2 0 2 2 0 8 0 scsiplug 72 3 0 3 1 0 1 1 0 8 1 scxspl 216 7871 0 7871 4 3 1 2 1 8 1 plimitpl 152 129 0 110 1 0 1 1 0 8 0 sigapl 424 713 0 662 7 0 7 7 0 8 0 futexpl 64 4532 0 4531 1 0 1 1 0 8 0 knotepl 120 315 0 0 10 0 10 10 0 8 0 kqueuepl 216 153 0 143 3 0 3 3 0 8 2 pipepl 320 123 0 96 3 0 3 3 0 8 0 fdescpl 496 693 0 661 5 0 5 5 0 8 0 filepl 152 3162 0 2911 13 0 13 13 0 8 2 lockfpl 104 105 0 103 1 0 1 1 0 8 0 lockfspl 48 45 0 43 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 38 0 21 1 0 1 1 0 8 0 ucredpl 104 370 0 355 1 0 1 1 0 8 0 zombiepl 144 665 0 662 1 0 1 1 0 8 0 processpl 1160 713 0 662 5 0 5 5 0 8 0 procpl 648 1186 0 1132 6 0 6 6 0 8 0 sosppl 168 1 0 1 1 0 1 1 0 8 1 sockpl 664 600 0 572 9 0 9 9 0 8 6 mcl64k 65536 1 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 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 139 0 0 18 0 18 18 0 8 0 mcl2k 2048 32 0 0 4 0 4 4 0 8 0 mtagpl 96 70 0 0 2 0 2 2 0 8 0 mbufpl 256 1228 0 0 77 0 77 77 0 8 0 bufpl 280 2800 0 98 193 0 193 193 0 8 0 anonpl 24 197438 0 193546 48 2 46 46 0 185 20 amapchunkpl 152 18298 0 17783 26 0 26 26 0 158 3 amappl16 200 5369 0 5346 15 5 10 14 0 8 8 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 145 0 131 1 0 1 1 0 8 0 amappl13 176 14 0 13 1 0 1 1 0 8 0 amappl12 168 1334 0 1301 4 2 2 3 0 8 0 amappl11 160 71 0 57 1 0 1 1 0 8 0 amappl10 152 38 0 38 1 1 0 1 0 8 0 amappl9 144 217 0 217 1 1 0 1 0 8 0 amappl8 136 22 0 19 1 0 1 1 0 8 0 amappl7 128 127 0 113 1 0 1 1 0 8 0 amappl6 120 166 0 164 1 0 1 1 0 8 0 amappl5 112 136 0 125 1 0 1 1 0 8 0 amappl4 104 307 0 286 1 0 1 1 0 8 0 amappl3 96 3278 0 3180 3 0 3 3 0 8 0 amappl2 88 958 0 871 3 0 3 3 0 8 0 amappl1 80 8268 0 7680 14 0 14 14 0 8 0 amappl 88 5060 0 4886 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 0 1 1 0 8 1 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 6 0 6 1 1 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 11 0 2 1 0 1 1 0 8 0 uaddrrnd 24 694 0 662 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 694 0 662 1 0 1 1 0 8 0 vmmpekpl 168 7036 0 7001 2 0 2 2 0 8 0 vmmpepl 168 51449 0 49567 94 0 94 94 0 357 9 vmsppl 448 693 0 662 6 1 5 5 0 8 0 rwobjpl 56 21092 0 17790 47 0 47 47 0 8 0 pdppl 4096 1395 0 1324 107 34 73 85 0 8 2 pvpl 32 14125 0 0 114 0 114 114 0 265 0 pmappl 248 693 0 662 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 457 0 40 12 0 12 12 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(fffffd806bf544e0,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806bf544d0,1) at rw_enter+0x122 rrw_enter(fffffd806bf544d0,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8062bd7710,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8062bd7710,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd8062bd7710,ffff800011a26140,df,0,1,7f586fc53e081d6a,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd8062d72d38) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff8131d350,2902,8000,ffffffff818b3880,ffff800030985ee8) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff800030985d50) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd806e70fde0,ffff800030985ee8,0,fffffd807f7d3138) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806bf984e0,ffff800030985ee8,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000371e7c00,3,ffff800030985ee8,0,ffff800030985fa0) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_read(ffff8000371e7c00,ffff800030986050,ffff800030985fa0) at sys_read+0xa2 sys/kern/sys_generic.c:172 syscall(ffff800030986050) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800030986050) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x64fbdf50b80, 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(ffffffff8363aef0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8363aef0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 syscall(ffff80003378cc70) at syscall+0xad6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff80003378cc70) at syscall+0xad6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7590a3d04590, count: -6