witness: lock order reversal: 1st 0xfffffd806bfe5820 vmmaplk (&map->lock) 2nd 0xfffffd8076292b48 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{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(fffffd8076292b48,9,0) at witness_checkorder+0x1047 rw_enter(fffffd8076292b38,1) at rw_enter+0x122 rrw_enter(fffffd8076292b38,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd805fc26498,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805fc26498,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd805fc26498,ffff800011a26480,c,0,1,b776bd0625aa60d4,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd8063aa6268) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff820851c0,2902,8000,ffffffff8131b440,ffff80002ef7fff0) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff80002ef7fde0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd8076250de0,ffff80002ef7fff0,0,fffffd807f7d3680) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd8064309990,ffff80002ef7fff0,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000371ff700,4,ffff80002ef7fff0,0,ffff80002ef800b0) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff8000371ff700,ffff80002ef80160,ffff80002ef800b0) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff80002ef80160) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff80002ef80160) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3ad8ae82ee0, count: -16 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002ef7f8a0 rbx 0xfffffd80042c7938 rdx 0 rcx 0xffff8000371ff700 rax 0xffffffff8348eff0 cpu_info_full_primary+0x1ff0 r8 0xffff80002ef7f780 r9 0x8080808080808080 r10 0x2b5f56be77911e44 r11 0x12af831294b127ca r12 0 r13 0xfffffd8003adfe00 r14 0x3 r15 0xffffffff rip 0xffffffff812ecd15 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002ef7f890 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=80038 pid=22522 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=0xffff8000371fe2c0,0xffff8000371fef78 process=0xffff800037275228 user=0xffff80002ef7b000, vmspace=0xfffffd806bfe5728 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=1 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 60168 287548 99045 0 3 0x90 nanoslp syz-executor 60168 108570 99045 0 3 0x4000090 fsleep syz-executor 22522 468531 82207 0 3 0 vmmaplk syz-executor *22522 80038 82207 0 7 0x4000000 syz-executor 78535 434908 48144 0 2 0 syz-executor 78535 211099 48144 0 3 0x4000080 fsleep syz-executor 90716 85173 19831 0 2 0 syz-executor 90716 79537 19831 0 3 0x4000080 fsleep syz-executor 90716 166995 19831 0 3 0x4000080 fsleep syz-executor 91004 378757 44820 0 2 0 syz-executor 91004 18551 44820 0 3 0x4000080 ttyout syz-executor 90264 280866 46353 0 2 0x4000480 syz-executor 90264 263926 46353 0 3 0x4000080 msgwait syz-executor 90264 227 46353 0 3 0x4000080 fsleep syz-executor 90264 122706 46353 0 3 0x4000080 fsleep syz-executor 10853 406340 75353 0 2 0x480 syz-executor 10853 506445 75353 0 3 0x4000080 netcon syz-executor 10853 91165 75353 0 3 0x4000080 fsleep syz-executor 10548 499702 25247 0 2 0x480 syz-executor 10548 14077 25247 0 3 0x4000080 fsleep syz-executor 10548 367723 25247 0 3 0x4000080 wsevent_read syz-executor 10548 176412 25247 0 3 0x4000080 fsleep syz-executor 9062 122276 0 0 3 0x14200 acct acct 71227 449475 1 0 3 0x100083 ttyin getty 49814 215043 0 0 3 0x14280 nfsidl nfsio 71708 111854 0 0 3 0x14280 nfsidl nfsio 65722 302109 0 0 3 0x14280 nfsidl nfsio 12712 332424 0 0 3 0x14280 nfsidl nfsio 65626 418040 0 0 3 0x14280 nfsidl nfsio 71477 83208 0 0 3 0x14280 nfsidl nfsio 39439 360705 0 0 3 0x14280 nfsidl nfsio 23104 180481 0 0 3 0x14280 nfsidl nfsio 30351 268338 0 0 3 0x14280 nfsidl nfsio 78461 365975 0 0 3 0x14280 nfsidl nfsio 94373 241349 0 0 3 0x14280 nfsidl nfsio 26142 385689 0 0 3 0x14280 nfsidl nfsio 89325 243821 0 0 3 0x14280 nfsidl nfsio 11368 233440 0 0 3 0x14280 nfsidl nfsio 89582 82415 0 0 3 0x14280 nfsidl nfsio 28703 381441 0 0 3 0x14280 nfsidl nfsio 56306 486091 0 0 3 0x14280 nfsidl nfsio 31705 481560 0 0 3 0x14280 nfsidl nfsio 60849 438601 0 0 3 0x14280 nfsidl nfsio 43275 137811 0 0 3 0x14280 nfsidl nfsio 83155 350563 0 0 3 0x14200 bored sosplice 48144 475634 64924 0 3 0x82 nanoslp syz-executor 46353 239251 64924 0 2 0x2 syz-executor 19831 96489 64924 0 2 0x482 syz-executor 44820 215086 64924 0 7 0x2 syz-executor 25247 239438 64924 0 3 0x82 nanoslp syz-executor 75353 377112 64924 0 2 0x2 syz-executor 99045 385309 64924 0 2 0x482 syz-executor 82207 207153 64924 0 3 0x82 nanoslp syz-executor 64924 75325 62914 0 3 0x82 kqread syz-executor 62914 85744 55199 0 3 0x10008a sigsusp ksh 55199 218621 82752 0 3 0x98 kqread sshd-session 82752 103676 46734 0 3 0x92 kqread sshd-session 46734 139042 1 0 3 0x88 kqread sshd 93031 357692 63991 74 3 0x1100092 bpf pflogd 63991 253191 1 0 3 0x80 sbwait pflogd 51326 119055 49742 73 3 0x1100090 kqread syslogd 49742 209717 1 0 3 0x100082 sbwait syslogd 19274 108130 1 0 3 0x100080 kqread resolvd 91660 281052 94033 77 3 0x100092 kqread dhcpleased 66524 96232 94033 77 3 0x100092 kqread dhcpleased 94033 120160 1 0 3 0x80 kqread dhcpleased 36603 192948 0 0 3 0x14200 bored smr 21868 102456 0 0 3 0x14200 pgzero zerothread 45578 156710 0 0 3 0x14200 aiodoned aiodoned 52325 447096 0 0 3 0x14200 syncer update 98333 3165 0 0 3 0x14200 cleaner cleaner 80956 258251 0 0 3 0x14200 reaper reaper 53287 211883 0 0 3 0x14200 pgdaemon pagedaemon 29976 171345 0 0 3 0x14200 bored viomb 12140 372358 0 0 3 0x40014200 acpi0 acpi0 72072 472856 0 0 3 0x40014200 idle1 34169 9667 0 0 3 0x14200 bored softnet3 80534 253950 0 0 3 0x14200 bored softnet2 12144 302362 0 0 3 0x14200 bored softnet1 43876 86065 0 0 3 0x14200 bored softnet0 45585 436969 0 0 3 0x14200 bored systqmp 56310 299619 0 0 3 0x14200 bored systq 79207 188046 0 0 3 0x14200 tmoslp softclockmp 71176 518207 0 0 2 0x40014200 softclock 3708 212275 0 0 3 0x40014200 idle0 1 377094 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 22522 (syz-executor) thread 0xffff8000371ff700 (80038) shared rwlock vmmaplk r = 0 (0xfffffd806bfe5820) #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 (0xffffffff836258d8) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10193 11131K 14525K 166960K 13608 0 pcb 17 12K 12K 166960K 157 0 rtable 208 7K 7K 166960K 423 0 pf 36 18K 22K 166960K 75 0 ifaddr 41 7K 7K 166960K 61 0 ifgroup 54 2K 2K 166960K 84 0 sysctl 3 0K 0K 166960K 5 0 counters 62 36K 36K 166960K 82 0 ioctlops 0 0K 4K 166960K 1607 0 iov 0 0K 20K 166960K 37 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1702 107K 107K 166960K 2522 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 17 0 VM map 2 1K 1K 166960K 2 0 sem 28 6K 6K 166960K 36 0 dirhash 12 2K 2K 166960K 42 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 89K 166960K 1007 0 sigio 0 0K 0K 166960K 52 0 proc 72 91K 128K 166960K 668 0 subproc 104 6K 6K 166960K 106 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 262 0 in_multi 92 6K 7K 166960K 134 0 ether_multi 1 0K 0K 166960K 6 0 mrt 0 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 464 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 258 74K 87K 166960K 10992 0 UVM aobj 34 6K 6K 166960K 35 0 pinsyscall 43 86K 104K 166960K 2104 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 54 0 NDP 11 0K 2K 166960K 40 0 temp 59 6823K 6903K 166960K 39634 0 kqueue 13 20K 28K 166960K 199 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 82 0 79 1 0 1 1 0 8 0 rtentry 112 127 0 32 4 0 4 4 0 8 0 unpcb 144 650 0 625 5 4 1 4 0 8 0 syncache 336 7 0 7 2 1 1 1 0 8 1 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 808 323 0 313 9 2 7 8 0 8 6 arp 120 20 0 3 1 0 1 1 0 8 0 inpcb 336 1073 0 1058 12 6 6 7 0 8 4 nd6 136 28 0 3 1 0 1 1 0 8 0 pkpcb 40 9 0 9 3 2 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 6 0 2 1 0 1 1 0 482 0 pffrnode 88 6 0 2 1 0 1 1 0 8 0 pffrent 40 55 0 51 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 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 85 0 19 1 0 1 1 0 8 0 pfstkey 128 85 0 19 3 0 3 3 0 8 0 pfstate 376 85 0 19 7 0 7 7 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 256 542 0 111 29 1 28 29 0 8 0 art_table 32 544 0 111 4 0 4 4 0 8 0 art_node 16 122 0 38 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 6 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 30 0 4 1 0 1 1 0 8 0 shmpl 112 32 0 1 1 0 1 1 0 8 0 dirhash 1024 37 0 20 3 0 3 3 0 8 0 dino2pl 256 3177 0 1674 95 0 95 95 0 8 0 ffsino 272 3177 0 1674 101 0 101 101 0 8 0 nchpl 144 4610 0 2918 63 0 63 63 0 8 0 uvmvnodes 80 4111 0 0 84 0 84 84 0 8 0 vnodes 216 4111 0 0 229 0 229 229 0 8 0 namei 1024 15784 0 15784 2 1 1 2 0 8 1 percpumem 16 55 0 10 1 0 1 1 0 8 0 kstatmem 264 42 0 20 2 0 2 2 0 8 0 scsiplug 72 9 0 9 3 2 1 1 0 8 1 scxspl 216 13681 0 13681 10 5 5 8 1 8 5 plimitpl 152 154 0 137 1 0 1 1 0 8 0 sigapl 424 1333 0 1261 11 2 9 9 0 8 0 futexpl 64 14372 0 14363 1 0 1 1 0 8 0 knotepl 120 549 0 0 17 0 17 17 0 8 0 kqueuepl 216 342 0 333 2 0 2 2 0 8 1 pipepl 320 264 0 234 9 3 6 6 0 8 3 fdescpl 496 1293 0 1261 5 0 5 5 0 8 0 filepl 152 8239 0 7969 19 5 14 18 0 8 2 lockfpl 104 661 0 658 2 1 1 2 0 8 0 lockfspl 48 255 0 252 1 0 1 1 0 8 0 sessionpl 144 28 0 19 1 0 1 1 0 8 0 pgrppl 48 42 0 25 1 0 1 1 0 8 0 ucredpl 104 1232 0 1216 1 0 1 1 0 8 0 zombiepl 144 1261 0 1261 1 0 1 1 0 8 1 processpl 1160 1333 0 1261 7 1 6 6 0 8 0 procpl 648 2746 0 2660 8 0 8 8 0 8 0 srpgc 96 3 0 3 1 1 0 1 0 8 0 sosppl 168 7 0 7 3 2 1 1 0 8 1 sockpl 664 1825 0 1782 12 3 9 10 0 8 5 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 138 0 0 18 0 18 18 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 21 0 0 3 0 3 3 0 8 0 mtagpl 96 20 0 0 1 0 1 1 0 8 0 mbufpl 256 1178 0 0 73 0 73 73 0 8 0 bufpl 280 3885 0 105 270 0 270 270 0 8 0 anonpl 24 211564 0 203751 62 11 51 59 0 185 3 amapchunkpl 152 35697 0 35036 31 2 29 31 0 158 1 amappl16 200 4980 0 4796 21 11 10 16 0 8 0 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 123 0 111 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 1946 0 1913 4 2 2 3 0 8 0 amappl11 160 55 0 41 1 0 1 1 0 8 0 amappl10 152 7 0 7 2 2 0 1 0 8 0 amappl9 144 162 0 162 2 1 1 1 0 8 1 amappl8 136 24 0 21 1 0 1 1 0 8 0 amappl7 128 110 0 98 1 0 1 1 0 8 0 amappl6 120 164 0 163 1 0 1 1 0 8 0 amappl5 112 143 0 131 1 0 1 1 0 8 0 amappl4 104 332 0 313 1 0 1 1 0 8 0 amappl3 96 6621 0 6520 3 0 3 3 0 8 0 amappl2 88 1604 0 1517 3 0 3 3 0 8 0 amappl1 80 11114 0 10544 14 0 14 14 0 8 1 amappl 88 10528 0 10334 5 0 5 5 0 92 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 128 255 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 34 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1293 0 1261 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1293 0 1261 1 0 1 1 0 8 0 vmmpekpl 168 11855 0 11808 3 0 3 3 0 8 0 vmmpepl 168 85616 0 83519 100 6 94 96 0 357 2 vmsppl 448 1292 0 1261 6 2 4 5 0 8 0 rwobjpl 56 29338 0 24086 74 0 74 74 0 8 0 pdppl 4096 2593 0 2522 117 44 73 83 0 8 2 pvpl 32 15650 0 0 129 2 127 127 0 265 0 pmappl 248 1292 0 1261 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 479 0 59 13 0 13 13 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(fffffd8076292b48,9,0) at witness_checkorder+0x1047 rw_enter(fffffd8076292b38,1) at rw_enter+0x122 rrw_enter(fffffd8076292b38,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd805fc26498,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805fc26498,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd805fc26498,ffff800011a26480,c,0,1,b776bd0625aa60d4,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd8063aa6268) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff820851c0,2902,8000,ffffffff8131b440,ffff80002ef7fff0) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff80002ef7fde0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd8076250de0,ffff80002ef7fff0,0,fffffd807f7d3680) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd8064309990,ffff80002ef7fff0,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000371ff700,4,ffff80002ef7fff0,0,ffff80002ef800b0) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff8000371ff700,ffff80002ef80160,ffff80002ef800b0) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff80002ef80160) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff80002ef80160) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3ad8ae82ee0, 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x38 sys/dev/kcov.c:159 __mp_lock(ffffffff836256d0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff836256d0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 syscall(ffff80002a114f20) at syscall+0x2cc mi_syscall sys/sys/syscall_mi.h:155 [inline] syscall(ffff80002a114f20) at syscall+0x2cc sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cb42c0d0110, count: -7