witness: lock order reversal: 1st 0xffffffff8290fe50 netlock (netlock) 2nd 0xfffffd800872e018 vmmaplk (&map->lock) lock order "&map->lock"(rwlock) -> "netlock"(rwlock) first seen at: #0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 #1 udp_sysctl+0x8a sys/netinet/udp_usrreq.c:1269 #2 sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 lock order "netlock"(rwlock) -> "&map->lock"(rwlock) first seen at: #0 rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #4 kpageflttrap+0x209 #5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x53 #8 soo_ioctl+0x26c #9 sys_ioctl+0x4a2 #10 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #10 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #11 Xsyscall+0x128 Stopped at db_enter+0x18: 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+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(fffffd800872e018,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd800872e018,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd800872e008) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002e3e5de0,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002e3e5de0,ffff80002e3e5e18,ffff80002e3e5e40) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd800872e000,20ff9000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002e3e5f70,20ff9000) at kpageflttrap+0x209 kerntrap(ffff80002e3e5f70) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 soo_ioctl(fffffd80677f3908,c0286988,ffff80002e3e6190,ffff8000ffff5ce0) at soo_ioctl+0x26c sys_ioctl(ffff8000ffff5ce0,ffff80002e3e62a8,ffff80002e3e6300) at sys_ioctl+0x4a2 syscall(ffff80002e3e6370) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e3e6370) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4818d4558d0, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff80002e3e5ad0 rbx 0x3 rdx 0xffff800000bd9200 rcx 0 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffff80002e3e5a40 r9 0x8080808080808080 r10 0xabc5a143677bd0fa r11 0xa5ff9786ebf86960 r12 0xffffffff82aafeb0 w_lodata+0x52540 r13 0 r14 0xffffffff82aa2c50 w_lodata+0x452e0 r15 0xfffffd8002f62d80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e3e5ac0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.7) pid=269284 stat=onproc flags process=10 proc=4000000 pri=83, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffeafc0,0xffff8000fffeba50 process=0xffff8000fffef1f8 user=0xffff80002e3e1000, vmspace=0xfffffd800872e000 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 15035 352951 56706 32767 2 0x10 syz-executor.4 4733 516148 41109 32767 2 0x10 syz-executor.7 * 4733 269284 41109 32767 7 0x4000010 syz-executor.7 86596 284463 89408 32767 2 0x10 syz-executor.2 86596 177580 89408 32767 3 0x4000090 fsleep syz-executor.2 13018 361935 15651 32767 2 0x10 syz-executor.5 13018 257610 15651 32767 3 0x4000090 netio syz-executor.5 13018 92452 15651 32767 3 0x4000090 fsleep syz-executor.5 13097 486791 40077 32767 3 0x10 getblk syz-executor.1 40077 191913 24902 0 3 0x82 wait syz-executor.1 15651 116832 35280 32767 3 0x90 nanoslp syz-executor.5 35280 171522 24902 0 3 0x82 wait syz-executor.5 13209 263995 89723 32767 3 0x10 biowait syz-executor.0 89723 245605 24902 0 3 0x82 wait syz-executor.0 22704 419492 60937 32767 3 0x90 piperd syz-executor.6 60937 54855 24902 0 3 0x82 wait syz-executor.6 12467 214295 0 0 3 0x14200 bored sosplice 56706 390860 24537 32767 3 0x90 nanoslp syz-executor.4 41109 171287 64745 32767 3 0x90 nanoslp syz-executor.7 30316 132166 53762 32767 3 0x90 nanoslp syz-executor.3 64745 100277 24902 0 3 0x82 wait syz-executor.7 24537 436031 24902 0 3 0x82 wait syz-executor.4 53762 422772 24902 0 3 0x82 wait syz-executor.3 89408 192512 2088 32767 3 0x90 nanoslp syz-executor.2 2088 312423 24902 0 3 0x82 wait syz-executor.2 24902 135895 98993 0 3 0x82 nanoslp syz-fuzzer 24902 362517 98993 0 3 0x4000082 nanoslp syz-fuzzer 24902 166613 98993 0 3 0x4000082 thrsleep syz-fuzzer 24902 3346 98993 0 2 0x4000002 syz-fuzzer 24902 150611 98993 0 3 0x4000082 thrsleep syz-fuzzer 24902 117788 98993 0 3 0x4000082 thrsleep syz-fuzzer 24902 384968 98993 0 3 0x4000082 thrsleep syz-fuzzer 24902 298663 98993 0 3 0x4000082 thrsleep syz-fuzzer 24902 416456 98993 0 3 0x4000082 thrsleep syz-fuzzer 98993 221910 98584 0 3 0x10008a sigsusp ksh 98584 269398 89602 0 3 0x9a kqread sshd 7533 140088 1 0 3 0x100083 ttyin getty 89602 187975 1 0 3 0x88 kqread sshd 37071 495545 78522 73 3 0x1100090 kqread syslogd 78522 327863 1 0 3 0x100082 netio syslogd 53422 189889 1 0 3 0x100080 kqread resolvd 99770 243101 91723 77 3 0x100092 kqread dhcpleased 41535 319139 91723 77 3 0x100092 kqread dhcpleased 91723 380433 1 0 3 0x80 kqread dhcpleased 45359 90661 0 0 3 0x14200 bored smr 92661 302363 0 0 2 0x14200 zerothread 47185 21770 0 0 3 0x14200 aiodoned aiodoned 1384 400664 0 0 3 0x14200 syncer update 21124 136782 0 0 3 0x14200 cleaner cleaner 87516 517555 0 0 3 0x14200 reaper reaper 22848 163464 0 0 3 0x14200 pgdaemon pagedaemon 35937 495314 0 0 3 0x14200 bored viomb 33121 378570 0 0 3 0x40014200 acpi0 acpi0 61567 311793 0 0 3 0x40014200 idle1 96462 394286 0 0 7 0x14200 softnet 1776 415004 0 0 3 0x14200 bored systqmp 55171 49380 0 0 3 0x14200 bored systq 38543 194845 0 0 3 0x40014200 bored softclock 12780 221341 0 0 3 0x40014200 idle0 1 17166 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 4733 (syz-executor.7) thread 0xffff8000ffff5ce0 (269284) shared rwlock netlock r = 0 (0xffffffff8290fe50) #0 witness_lock+0x44d #1 ifioctl_get+0x3f0 sys/net/if.c:2348 #2 soo_ioctl+0x26c #3 sys_ioctl+0x4a2 #4 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #4 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #5 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829de988) #0 witness_lock+0x44d #1 soo_ioctl+0x25a sys/kern/sys_socket.c:136 #2 sys_ioctl+0x4a2 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 Process 13097 (syz-executor.1) thread 0xffff8000ffff4540 (486791) exclusive rrwlock inode r = 0 (0xfffffd806edd7b40) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347 #6 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #8 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 #9 domkdirat+0x121 sys/kern/vfs_syscalls.c:3101 #10 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #10 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806a2c6f78) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3086 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 Process 13209 (syz-executor.0) thread 0xffff8000ffff1510 (263995) exclusive rrwlock inode r = 0 (0xfffffd806edd7d60) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347 #6 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #8 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 #9 domkdirat+0x121 sys/kern/vfs_syscalls.c:3101 #10 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #10 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806965e1b0) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3086 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 Process 96462 (softnet) thread 0xffff8000210f8540 (394286) shared rwlock softnet r = 0 (0xffff80000002c070) #0 witness_lock+0x44d #1 taskq_thread+0xca sys/kern/kern_task.c:445 #2 proc_trampoline+0x1c ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10191 6409K 6419K 78643K 11303 0 pcb 13 12K 14K 78643K 17 0 rtable 252 7K 7K 78643K 855 0 ifaddr 81 17K 17K 78643K 132 0 sysctl 2 0K 0K 78643K 2 0 counters 56 35K 35K 78643K 70 0 ioctlops 0 0K 2K 78643K 135 0 iov 0 0K 32K 78643K 887 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1271 79K 79K 78643K 2425 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 71 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 2067 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 22 81K 121K 78643K 8250 0 sigio 0 0K 0K 78643K 393 0 proc 56 74K 123K 78643K 1066 0 subproc 104 6K 6K 78643K 195 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 479 0 in_multi 99 6K 7K 78643K 254 0 ether_multi 1 0K 0K 78643K 23 0 mrt 1 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 163 731K 731K 78643K 163 0 exec 0 0K 2K 78643K 1882 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 385 91K 106K 78643K 107687 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 408 0 NDP 13 0K 2K 78643K 48 0 temp 125 4707K 4771K 78643K 23065 0 kqueue 12 18K 26K 78643K 1290 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 622 0 619 10 9 1 6 0 8 0 rtentry 112 209 0 92 4 0 4 4 0 8 0 unpcb 136 5897 0 5883 65 59 6 9 0 8 5 syncache 296 67 0 67 14 13 1 1 0 8 1 tcpqe 32 105 0 105 9 9 0 1 0 8 0 tcpcb 736 9333 0 9325 157 149 8 39 0 8 7 arp 120 34 0 16 1 0 1 1 0 8 0 ipq 40 14 0 14 3 3 0 1 0 8 0 ipqe 40 289 0 289 3 3 0 1 0 8 0 inpcb 304 14475 0 14465 79 74 5 13 0 8 4 rttmr 72 8 0 6 1 0 1 1 0 8 0 ip6q 72 6 0 6 3 3 0 1 0 8 0 ip6af 40 13 0 13 3 3 0 1 0 8 0 nd6 48 62 0 33 1 0 1 1 0 8 0 kcovpl 48 15 0 7 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 895 0 381 36 3 33 33 0 8 0 art_table 32 896 0 381 6 1 5 5 0 8 0 art_node 16 208 0 101 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 0 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 2062 0 2052 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 12041 0 10602 91 0 91 91 0 8 0 ffsino 272 12042 0 10602 97 0 97 97 0 8 0 nchpl 144 23363 0 21740 62 0 62 62 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 74094 0 74092 5 4 1 2 0 8 0 percpumem 16 47 0 7 1 0 1 1 0 8 0 scxspl 216 63547 0 63546 18 17 1 8 0 8 0 plimitpl 152 1210 0 1188 4 3 1 2 0 8 0 sigapl 424 8516 0 8467 7 1 6 7 0 8 0 futexpl 64 72982 0 72980 5 4 1 1 0 8 0 knotepl 120 566 0 0 11 0 11 11 0 8 0 kqueuepl 216 5229 0 5219 56 53 3 9 0 8 2 pipepl 336 2958 0 2930 48 40 8 11 0 8 5 fdescpl 496 8501 0 8468 6 1 5 6 0 8 0 filepl 152 64008 0 63769 80 64 16 19 0 8 6 lockfpl 104 743 0 741 1 0 1 1 0 8 0 lockfspl 48 273 0 271 1 0 1 1 0 8 0 sessionpl 144 30 0 14 1 0 1 1 0 8 0 pgrppl 48 102 0 86 1 0 1 1 0 8 0 ucredpl 96 6511 0 6493 1 0 1 1 0 8 0 zombiepl 144 8468 0 8467 1 0 1 1 0 8 0 processpl 1064 8516 0 8467 4 0 4 4 0 8 0 procpl 672 24370 0 24309 11 4 7 8 0 8 0 sosppl 168 656 0 655 11 10 1 1 0 8 0 sockpl 480 21198 0 21171 348 337 11 34 0 8 7 mcl64k 65536 34 0 0 4 1 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 26 0 0 2 0 2 2 0 8 0 mcl9k 9216 23 0 0 2 0 2 2 0 8 0 mcl8k 8192 37 0 0 4 2 2 3 0 8 0 mcl4k 4096 32 0 0 4 1 3 3 0 8 0 mcl2k2 2112 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 234 0 0 19 2 17 19 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 630 0 0 28 0 28 28 0 8 0 bufpl 288 14913 0 8578 453 0 453 453 0 8 0 anonpl 24 2664236 0 2651164 229 118 111 137 0 186 5 amapchunkpl 152 273898 0 273154 95 57 38 48 0 158 4 amappl16 200 39957 0 39604 221 193 28 45 0 8 8 amappl15 192 638 0 633 1 0 1 1 0 8 0 amappl14 184 23 0 20 1 0 1 1 0 8 0 amappl13 176 1132 0 1129 1 0 1 1 0 8 0 amappl12 168 29 0 22 2 1 1 1 0 8 0 amappl11 160 876 0 864 1 0 1 1 0 8 0 amappl10 152 545 0 541 1 0 1 1 0 8 0 amappl9 144 4435 0 4425 1 0 1 1 0 8 0 amappl8 136 2275 0 2141 5 0 5 5 0 8 0 amappl7 128 1386 0 1370 1 0 1 1 0 8 0 amappl6 120 4192 0 4165 3 2 1 2 0 8 0 amappl5 112 8103 0 8081 1 0 1 1 0 8 0 amappl4 104 2043 0 2006 3 1 2 2 0 8 1 amappl3 96 1674 0 1663 1 0 1 1 0 8 0 amappl2 88 2026 0 1980 3 1 2 3 0 8 0 amappl1 80 153844 0 153242 21 7 14 18 0 8 0 amappl 88 106775 0 106520 10 2 8 8 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 128 253 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 8501 0 8468 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 8501 0 8468 1 0 1 1 0 8 0 vmmpekpl 168 72925 0 72867 4 0 4 4 0 8 0 vmmpepl 168 793939 0 791414 205 71 134 146 0 357 8 vmsppl 368 8500 0 8468 4 0 4 4 0 8 0 rwobjpl 56 210463 0 203069 116 6 110 112 0 8 0 pdppl 4096 17009 0 16936 265 184 81 93 0 8 8 pvpl 32 4265214 0 4247062 407 210 197 260 0 265 16 pmappl 248 8500 0 8468 3 0 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1226 0 389 25 0 25 25 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(fffffd800872e018,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd800872e018,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd800872e008) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002e3e5de0,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002e3e5de0,ffff80002e3e5e18,ffff80002e3e5e40) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd800872e000,20ff9000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002e3e5f70,20ff9000) at kpageflttrap+0x209 kerntrap(ffff80002e3e5f70) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 soo_ioctl(fffffd80677f3908,c0286988,ffff80002e3e6190,ffff8000ffff5ce0) at soo_ioctl+0x26c sys_ioctl(ffff8000ffff5ce0,ffff80002e3e62a8,ffff80002e3e6300) at sys_ioctl+0x4a2 syscall(ffff80002e3e6370) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e3e6370) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4818d4558d0, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020ce8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x34 sys/dev/kcov.c:154 __mp_lock(ffffffff829de780) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x133 sys/kern/kern_lock.c:147 if_qstart_compat(ffff80000019f558) at if_qstart_compat+0x1a sys/net/if.c:675 ifq_serialize(ffff80000019f558,ffff80000019f678) at ifq_serialize+0x16e sys/net/ifq.c:113 taskq_thread(ffff80000002c000) at taskq_thread+0xe5 sys/kern/kern_task.c:449 end trace frame: 0x0, count: -8