witness: lock order reversal: 1st 0xfffffd806c1eb2e0 vmmaplk (&map->lock) 2nd 0xfffffd8069e40a38 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(fffffd8069e40a38,9,0) at witness_checkorder+0x1047 rw_enter(fffffd8069e40a28,1) at rw_enter+0x122 rrw_enter(fffffd8069e40a28,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd806a04a210,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806a04a210,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd806a04a210,ffff800011a26080,1f,0,1,6c957af9052f7d7d,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd80639a2040) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff82ad13c0,2902,8000,ffffffff82b37ee0,ffff800034d92250) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff800034d92040) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd80734d3eb8,ffff800034d92250,0,fffffd807f7d3618) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806c02b690,ffff800034d92250,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff80002a0dbc08,3,ffff800034d92250,0,ffff800034d92310) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff80002a0dbc08,ffff800034d923c0,ffff800034d92310) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff800034d923c0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800034d923c0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf41faa6cf0, count: -16 ddb{1}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff800034d91b00 rbx 0xfffffd80042cc818 rdx 0xffff800001284b80 rcx 0xffff80002a0dbc08 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff800034d919e0 r9 0x8080808080808080 r10 0xf039a484d88fd706 r11 0x7ceefa89ab6f1b7a r12 0 r13 0xfffffd8003ae3e00 r14 0x3 r15 0xffffffff rip 0xffffffff829b4485 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800034d91af0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=443482 pid=59980 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=0xffff8000ffffccb8,0xffff800029fd8cc0 process=0xffff8000ffff7b00 user=0xffff800034d8d000, vmspace=0xfffffd806c1eb1e8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 12690 442525 75562 0 2 0x10 syz-executor 12690 31480 75562 0 3 0x4000090 fsleep syz-executor 59980 30969 24242 0 2 0 syz-executor *59980 443482 24242 0 7 0x4000000 syz-executor 59980 14494 24242 0 3 0x4000080 fsleep syz-executor 95263 135263 31977 0 3 0x80 nanoslp syz-executor 95263 249523 31977 0 3 0x4000080 kqsel syz-executor 95263 206147 31977 0 3 0x4000080 fsleep syz-executor 32945 68194 24144 0 3 0x82 nanoslp syz-executor 13191 35083 0 0 3 0x14200 bored sosplice 17051 268885 24144 0 3 0x2 biowait syz-executor 71489 327984 24144 0 3 0x82 nanoslp syz-executor 48487 161059 24144 0 2 0x2 syz-executor 31977 253765 24144 0 3 0x82 nanoslp syz-executor 24242 188581 24144 0 3 0x82 nanoslp syz-executor 75562 292662 24144 0 3 0x82 nanoslp syz-executor 34636 256506 24144 0 3 0x82 nanoslp syz-executor 24144 76241 48901 0 3 0x82 kqread syz-executor 48901 172631 78306 0 3 0x10008a sigsusp ksh 78306 266574 38146 0 3 0x98 kqread sshd-session 38146 511277 29595 0 3 0x92 kqread sshd-session 69066 482417 1 0 3 0x100083 ttyin getty 29595 297258 1 0 3 0x88 kqread sshd 96014 328986 87798 74 3 0x1100092 bpf pflogd 87798 455515 1 0 3 0x80 sbwait pflogd 22488 293042 48253 73 3 0x1100090 kqread syslogd 48253 242034 1 0 3 0x100082 sbwait syslogd 59830 452522 1 0 3 0x100080 kqread resolvd 60728 26689 71910 77 3 0x100092 kqread dhcpleased 95317 317309 71910 77 3 0x100092 kqread dhcpleased 71910 353950 1 0 3 0x80 kqread dhcpleased 57423 462530 0 0 3 0x14200 bored smr 74573 110660 0 0 2 0x14200 zerothread 91543 433439 0 0 3 0x14200 aiodoned aiodoned 95085 490801 0 0 3 0x14200 syncer update 28434 475355 0 0 3 0x14200 cleaner cleaner 47007 402441 0 0 7 0x14200 reaper 17575 90102 0 0 3 0x14200 pgdaemon pagedaemon 28482 139722 0 0 3 0x14200 bored viomb 24743 102841 0 0 3 0x40014200 acpi0 acpi0 59676 480733 0 0 3 0x40014200 idle1 48924 75499 0 0 3 0x14200 bored softnet3 86163 452601 0 0 3 0x14200 bored softnet2 57972 457353 0 0 3 0x14200 bored softnet1 49898 262878 0 0 3 0x14200 bored softnet0 37098 196627 0 0 2 0x14200 systqmp 65530 223083 0 0 3 0x14200 bored systq 20559 409069 0 0 3 0x14200 tmoslp softclockmp 48686 250519 0 0 3 0x40014200 tmoslp softclock 78499 147735 0 0 3 0x40014200 idle0 1 18604 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 59980 (syz-executor) thread 0xffff80002a0dbc08 (443482) shared rwlock vmmaplk r = 0 (0xfffffd806c1eb2e0) #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 (0xffffffff835c11c0) #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 Process 17051 (syz-executor) thread 0xffff800029fd8290 (268885) exclusive rrwlock inode r = 0 (0xfffffd806d28c2c0) #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 (0xfffffd806fb624d8) #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 Process 37098 (systqmp) thread 0xffff8000ffffe000 (196627) shared rwlock systqmp r = 0 (0xffffffff83489c20) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 taskq_thread+0x12a sys/kern/kern_task.c:444 #2 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10209 11193K 11392K 166960K 11823 0 pcb 17 13K 13K 166960K 95 0 rtable 224 7K 8K 166960K 636 0 pf 38 18K 18K 166960K 57 0 ifaddr 46 7K 7K 166960K 59 0 ifgroup 60 2K 2K 166960K 73 0 sysctl 3 0K 0K 166960K 3 0 counters 66 36K 36K 166960K 72 0 ioctlops 0 0K 4K 166960K 1553 0 iov 0 0K 24K 166960K 30 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1431 90K 90K 166960K 1859 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 85 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 16 57K 93K 166960K 595 0 sigio 0 0K 0K 166960K 9 0 proc 72 91K 128K 166960K 626 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 1 0K 0K 166960K 74 0 in_multi 99 7K 7K 166960K 141 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 444 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 4 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 241 73K 73K 166960K 6970 0 UVM aobj 17 4K 4K 166960K 19 0 pinsyscall 41 82K 104K 166960K 1726 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 31 0 NDP 13 0K 2K 166960K 36 0 temp 55 6822K 6902K 166960K 19068 0 kqueue 14 22K 30K 166960K 107 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 66 0 62 1 0 1 1 0 8 0 rtentry 112 203 0 101 4 0 4 4 0 8 0 unpcb 144 711 0 694 11 5 6 6 0 8 5 syncache 336 5 0 5 3 2 1 1 0 8 1 tcpcb 808 215 0 208 7 6 1 7 0 8 0 arp 120 22 0 4 1 0 1 1 0 8 0 inpcb 336 641 0 630 9 5 4 7 0 8 2 nd6 136 33 0 6 1 0 1 1 0 8 0 pkpcb 40 5 0 5 2 1 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1168 1 0 0 1 0 1 1 0 8 0 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 3 0 1 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 pfrktable 1344 1 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 45 0 2 1 0 1 1 0 8 0 pfstkey 128 45 0 2 2 0 2 2 0 8 0 pfstate 376 45 0 2 5 0 5 5 0 8 0 pfrule 1344 22 0 15 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 577 0 160 29 2 27 29 0 8 0 art_table 32 578 0 160 4 0 4 4 0 8 0 art_node 16 136 0 44 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 5 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 83 0 73 1 0 1 1 0 8 0 shmpl 112 16 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2444 0 937 95 0 95 95 0 8 0 ffsino 272 2444 0 937 102 0 102 102 0 8 0 nchpl 144 3282 0 1593 63 0 63 63 0 8 0 uvmvnodes 80 2794 0 0 58 0 58 58 0 8 0 vnodes 216 2794 0 0 156 0 156 156 0 8 0 namei 1024 12553 0 12552 3 2 1 2 0 8 0 percpumem 16 50 0 3 1 0 1 1 0 8 0 kstatmem 264 32 0 6 2 0 2 2 0 8 0 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 9287 0 9286 10 2 8 8 1 8 7 plimitpl 152 135 0 118 1 0 1 1 0 8 0 sigapl 424 912 0 862 8 2 6 8 0 8 0 futexpl 64 6770 0 6767 1 0 1 1 0 8 0 knotepl 120 581 0 0 18 0 18 18 0 8 0 kqueuepl 216 192 0 181 3 2 1 3 0 8 0 pipepl 320 212 0 184 8 0 8 8 0 8 5 fdescpl 496 873 0 843 5 0 5 5 0 8 0 filepl 152 5853 0 5591 21 4 17 17 0 8 5 lockfpl 104 147 0 144 1 0 1 1 0 8 0 lockfspl 48 71 0 68 1 0 1 1 0 8 0 sessionpl 144 26 0 17 1 0 1 1 0 8 0 pgrppl 48 38 0 21 1 0 1 1 0 8 0 ucredpl 104 1127 0 1111 1 0 1 1 0 8 0 zombiepl 144 866 0 862 1 0 1 1 0 8 0 processpl 1160 912 0 862 5 1 4 5 0 8 0 procpl 648 1658 0 1603 7 1 6 7 0 8 0 srpgc 96 4 0 4 1 1 0 1 0 8 0 sosppl 168 3 0 3 1 1 0 1 0 8 0 sockpl 664 1430 0 1398 24 13 11 14 0 8 7 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 140 0 0 18 0 18 18 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 15 0 0 1 0 1 1 0 8 0 mbufpl 256 284 0 0 18 0 18 18 0 8 0 bufpl 280 3118 0 98 216 0 216 216 0 8 0 anonpl 24 188286 0 184472 52 3 49 49 0 185 22 amapchunkpl 152 22273 0 21751 25 2 23 23 0 158 0 amappl16 200 4945 0 4914 22 11 11 15 0 8 8 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 139 0 127 1 0 1 1 0 8 0 amappl13 176 9 0 9 1 1 0 1 0 8 0 amappl12 168 1552 0 1522 4 1 3 3 0 8 0 amappl11 160 75 0 61 1 0 1 1 0 8 0 amappl10 152 13 0 13 1 1 0 1 0 8 0 amappl9 144 142 0 142 1 1 0 1 0 8 0 amappl8 136 46 0 42 1 0 1 1 0 8 0 amappl7 128 110 0 98 1 0 1 1 0 8 0 amappl6 120 192 0 191 1 0 1 1 0 8 0 amappl5 112 145 0 133 1 0 1 1 0 8 0 amappl4 104 316 0 298 1 0 1 1 0 8 0 amappl3 96 4213 0 4115 3 0 3 3 0 8 0 amappl2 88 1172 0 1088 3 0 3 3 0 8 0 amappl1 80 9400 0 8839 14 0 14 14 0 8 1 amappl 88 6534 0 6356 5 0 5 5 0 92 0 dma65536 65536 2 0 2 1 1 0 1 0 8 0 dma32768 32768 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 128 254 0 254 2 1 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 18 0 2 1 0 1 1 0 8 0 uaddrrnd 24 873 0 843 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 873 0 843 1 0 1 1 0 8 0 vmmpekpl 168 8842 0 8796 3 0 3 3 0 8 0 vmmpepl 168 61473 0 59633 96 1 95 95 0 357 6 vmsppl 448 872 0 843 6 1 5 5 0 8 1 rwobjpl 56 23402 0 19651 56 1 55 55 0 8 1 pdppl 4096 1753 0 1686 111 38 73 85 0 8 6 pvpl 32 14634 0 0 120 1 119 119 0 265 0 pmappl 248 872 0 843 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 417 0 60 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(ffffffff834d7ff0) 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(ffffffff835c0fb8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835c0fb8) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff800029fe4c90,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:590 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:158 __mp_lock(ffffffff835c0fb8) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835c0fb8) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 intr_handler(ffff800029fe4e00,ffff800000079e00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge25_untramp() at Xintr_ioapic_edge25_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:158 __mp_lock(ffffffff835c0fb8) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835c0fb8) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 intr_handler(ffff800029fe4f70,ffff800000079f80) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff835c0fb8) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835c0fb8) at __mp_lock+0x199 sys/kern/kern_lock.c:144 reaper(ffff800029fd96d0) at reaper+0x24b sys/kern/kern_exit.c:478 end trace frame: 0x0, count: -16 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(fffffd8069e40a38,9,0) at witness_checkorder+0x1047 rw_enter(fffffd8069e40a28,1) at rw_enter+0x122 rrw_enter(fffffd8069e40a28,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd806a04a210,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806a04a210,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd806a04a210,ffff800011a26080,1f,0,1,6c957af9052f7d7d,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd80639a2040) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff82ad13c0,2902,8000,ffffffff82b37ee0,ffff800034d92250) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff800034d92040) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd80734d3eb8,ffff800034d92250,0,fffffd807f7d3618) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806c02b690,ffff800034d92250,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff80002a0dbc08,3,ffff800034d92250,0,ffff800034d92310) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff80002a0dbc08,ffff800034d923c0,ffff800034d92310) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff800034d923c0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800034d923c0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf41faa6cf0, count: -16