login: witness: lock order reversal: 1st 0xffffffff8290fe50 netlock (netlock) 2nd 0xfffffd80771b6480 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 ifioctl_get+0x2dd #9 soo_ioctl+0x26c #10 sys_ioctl+0x4a2 #11 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #11 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #12 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(fffffd80771b6480,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80771b6480,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd80771b6470) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002e38f670,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002e38f670,ffff80002e38f6a8,ffff80002e38f6d0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd80771b6468,20000000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002e38f800,20000300) at kpageflttrap+0x209 kerntrap(ffff80002e38f800) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 ifioctl_get(c0106924,ffff80002e38fab0) at ifioctl_get+0x2dd soo_ioctl(fffffd8077890398,c0106924,ffff80002e38fab0,ffff800022c42a90) at soo_ioctl+0x26c sys_ioctl(ffff800022c42a90,ffff80002e38fbc8,ffff80002e38fc20) at sys_ioctl+0x4a2 syscall(ffff80002e38fc90) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e38fc90) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x63913dc6cf0, count: -15 ddb{0}> show registers rdi 0x3 rsi 0xffffffff8294abb0 __sancov_gen_cov_switch_values.134 rbp 0xffff80002e38f360 rbx 0x3 rdx 0 rcx 0 rax 0xffff800022c42a90 r8 0xffff80002e38f2d0 r9 0x8080808080808080 r10 0xc167a6ef72d3bdf9 r11 0xbce0b945915bbe73 r12 0xffffffff82ab0640 w_lodata+0x52cd0 r13 0 r14 0xffffffff82aa5900 w_lodata+0x47f90 r15 0xfffffd8002f62d80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e38f350 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.5) pid=236269 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=56, nice=20 forw=0xffffffffffffffff, list=0xffff800022c422b0,0xffff800021208a90 process=0xffff8000ffffa148 user=0xffff80002e38a000, vmspace=0xfffffd80771b6468 estcpu=24, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 65395 87218 24558 32767 2 0x10 syz-executor.3 40707 337428 56876 32767 2 0x10 syz-executor.5 *40707 236269 56876 32767 7 0x4000010 syz-executor.5 70952 294148 45951 32767 2 0x10 syz-executor.7 70952 215209 45951 32767 3 0x4000090 fsleep syz-executor.7 70952 273406 45951 32767 2 0x4000010 syz-executor.7 70952 47449 45951 32767 3 0x4000090 fsleep syz-executor.7 36124 253012 64193 32767 2 0x10 syz-executor.4 36124 241223 64193 32767 2 0x4000010 syz-executor.4 83280 508720 84887 32767 2 0x10 syz-executor.6 10409 105503 31348 32767 2 0x10 syz-executor.2 10409 20909 31348 32767 3 0x4000090 fsleep syz-executor.2 64193 407402 37692 32767 3 0x90 nanoslp syz-executor.4 37692 402303 82955 0 3 0x82 wait syz-executor.4 49451 54016 16032 32767 3 0x90 nanoslp syz-executor.0 16032 115918 82955 0 3 0x82 wait syz-executor.0 56313 61402 0 0 3 0x14200 bored sosplice 84887 392069 98145 32767 3 0x90 nanoslp syz-executor.6 56876 523132 89603 32767 3 0x90 nanoslp syz-executor.5 98145 512890 82955 0 3 0x82 wait syz-executor.6 45951 22719 62787 32767 3 0x90 nanoslp syz-executor.7 62787 372532 82955 0 3 0x82 wait syz-executor.7 89603 222488 82955 0 3 0x82 wait syz-executor.5 31348 450804 79719 32767 2 0x10 syz-executor.2 24558 339333 75244 32767 3 0x90 nanoslp syz-executor.3 79719 402584 82955 0 3 0x82 wait syz-executor.2 75244 176016 82955 0 3 0x82 wait syz-executor.3 10171 430297 19251 32767 3 0x90 nanoslp syz-executor.1 19251 45501 82955 0 3 0x82 wait syz-executor.1 82955 433255 50767 0 3 0x82 thrsleep syz-fuzzer 82955 446005 50767 0 3 0x4000082 thrsleep syz-fuzzer 82955 60103 50767 0 3 0x4000082 thrsleep syz-fuzzer 82955 185787 50767 0 3 0x4000082 thrsleep syz-fuzzer 82955 261308 50767 0 3 0x4000082 thrsleep syz-fuzzer 82955 356956 50767 0 3 0x4000082 thrsleep syz-fuzzer 82955 214823 50767 0 3 0x4000082 kqread syz-fuzzer 82955 109693 50767 0 3 0x4000082 thrsleep syz-fuzzer 82955 444492 50767 0 3 0x4000082 thrsleep syz-fuzzer 50767 20780 28029 0 3 0x10008a sigsusp ksh 28029 57937 36449 0 3 0x9a kqread sshd 6154 254483 1 0 3 0x100083 ttyin getty 36449 189524 1 0 3 0x88 kqread sshd 89372 354168 76871 73 3 0x1100090 kqread syslogd 76871 269665 1 0 3 0x100082 netio syslogd 12613 265224 1 0 3 0x100080 kqread resolvd 40646 56465 11318 77 3 0x100092 kqread dhcpleased 5530 360563 11318 77 3 0x100092 kqread dhcpleased 11318 253881 1 0 3 0x80 kqread dhcpleased 28898 91279 0 0 3 0x14200 bored smr 48145 277384 0 0 2 0x14200 zerothread 32502 495037 0 0 3 0x14200 aiodoned aiodoned 37705 411646 0 0 3 0x14200 syncer update 15070 329105 0 0 3 0x14200 cleaner cleaner 98475 21072 0 0 7 0x14200 reaper 65729 98258 0 0 3 0x14200 pgdaemon pagedaemon 16488 370045 0 0 3 0x14200 bored viomb 77342 374811 0 0 3 0x40014200 acpi0 acpi0 50015 209416 0 0 3 0x40014200 idle1 98874 441943 0 0 3 0x14200 bored softnet 25560 390575 0 0 3 0x14200 bored systqmp 46689 86126 0 0 3 0x14200 bored systq 74962 466398 0 0 3 0x40014200 bored softclock 21103 166184 0 0 3 0x40014200 idle0 1 268334 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 40707 (syz-executor.5) thread 0xffff800022c42a90 (236269) shared rwlock netlock r = 0 (0xffffffff8290fe50) #0 witness_lock+0x44d #1 ifioctl_get+0x2d5 sys/net/if.c:2319 #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10178 6408K 6419K 78643K 11280 0 pcb 13 8K 8K 78643K 13 0 rtable 242 7K 7K 78643K 729 0 ifaddr 81 16K 16K 78643K 110 0 counters 56 35K 35K 78643K 64 0 ioctlops 0 0K 2K 78643K 40 0 iov 0 0K 16K 78643K 289 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1270 79K 79K 78643K 1535 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 16 0 VM map 2 1K 1K 78643K 2 0 sem 11 1K 1K 78643K 18 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 24 89K 121K 78643K 2170 0 sigio 0 0K 0K 78643K 4 0 proc 56 74K 111K 78643K 715 0 subproc 104 6K 6K 78643K 156 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 298 0 in_multi 99 6K 6K 78643K 165 0 ether_multi 1 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 85 387K 387K 78643K 85 0 exec 0 0K 2K 78643K 998 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 338 86K 90K 78643K 28678 0 UVM aobj 37 6K 6K 78643K 42 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 37 0 NDP 11 0K 2K 78643K 39 0 temp 125 4707K 4771K 78643K 9065 0 kqueue 12 18K 24K 78643K 184 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 120 233 0 229 4 2 2 3 0 8 1 rtentry 112 161 0 49 4 0 4 4 0 8 0 unpcb 136 2006 0 1991 15 14 1 6 0 8 0 syncache 296 23 0 23 5 5 0 1 0 8 0 tcpqe 32 142 0 142 3 3 0 1 0 8 0 tcpcb 736 1625 0 1609 19 17 2 10 0 8 0 arp 120 26 0 8 1 0 1 1 0 8 0 ipq 40 4 0 3 1 0 1 1 0 8 0 ipqe 40 55 0 54 1 0 1 1 0 8 0 inpcb 304 2986 0 2972 15 13 2 8 0 8 0 ip6q 72 4 0 3 2 1 1 1 0 8 0 ip6af 40 7 0 7 2 2 0 1 0 8 0 nd6 48 42 0 16 1 0 1 1 0 8 0 kcovpl 48 12 0 4 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 667 0 184 31 0 31 31 0 8 0 art_table 32 668 0 184 4 0 4 4 0 8 0 art_node 16 160 0 58 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 9 0 0 1 0 1 1 0 8 0 shmpl 112 39 0 5 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3932 0 2503 90 0 90 90 0 8 0 ffsino 272 3932 0 2503 96 0 96 96 0 8 0 nchpl 144 6744 0 5120 62 0 62 62 0 8 0 uvmvnodes 80 4097 0 0 84 0 84 84 0 8 0 vnodes 224 4097 0 0 241 0 241 241 0 8 0 namei 1024 22723 0 22723 2 1 1 2 0 8 1 percpumem 16 44 0 4 1 0 1 1 0 8 0 scxspl 216 19165 0 19165 16 15 1 8 0 8 1 plimitpl 152 347 0 325 3 2 1 2 0 8 0 sigapl 424 2438 0 2386 7 1 6 7 0 8 0 futexpl 64 20106 0 20103 1 0 1 1 0 8 0 knotepl 120 499 0 0 15 0 15 15 0 8 0 kqueuepl 216 2509 0 2500 22 21 1 8 0 8 0 pipepl 336 458 0 430 13 10 3 9 0 8 0 fdescpl 496 2423 0 2388 7 2 5 6 0 8 0 filepl 152 16498 0 16256 30 19 11 17 0 8 1 lockfpl 104 423 0 421 1 0 1 1 0 8 0 lockfspl 48 83 0 81 1 0 1 1 0 8 0 sessionpl 144 27 0 11 1 0 1 1 0 8 0 pgrppl 48 35 0 19 1 0 1 1 0 8 0 ucredpl 96 1663 0 1645 1 0 1 1 0 8 0 zombiepl 144 2388 0 2386 1 0 1 1 0 8 0 processpl 1064 2438 0 2386 5 1 4 4 0 8 0 procpl 672 6127 0 6061 9 3 6 7 0 8 0 sosppl 168 8 0 8 2 2 0 1 0 8 0 sockpl 480 5279 0 5246 79 70 9 21 0 8 4 mcl64k 65536 15 0 0 2 0 2 2 0 8 0 mcl16k 16384 12 0 0 2 0 2 2 0 8 0 mcl12k 12288 15 0 0 2 0 2 2 0 8 0 mcl9k 9216 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 18 0 0 3 1 2 3 0 8 0 mcl4k 4096 18 0 0 3 0 3 3 0 8 0 mcl2k2 2112 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 195 0 0 22 0 22 22 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 3728 0 0 228 1 227 227 0 8 0 bufpl 288 6069 0 140 424 0 424 424 0 8 0 anonpl 24 626466 0 612707 128 37 91 113 0 186 0 amapchunkpl 152 67783 0 67008 45 12 33 36 0 158 1 amappl16 200 5634 0 5258 41 21 20 33 0 8 0 amappl15 192 348 0 338 1 0 1 1 0 8 0 amappl14 184 29 0 25 1 0 1 1 0 8 0 amappl13 176 113 0 112 1 0 1 1 0 8 0 amappl12 168 515 0 507 1 0 1 1 0 8 0 amappl11 160 805 0 789 1 0 1 1 0 8 0 amappl10 152 291 0 283 1 0 1 1 0 8 0 amappl9 144 717 0 711 1 0 1 1 0 8 0 amappl8 136 698 0 629 3 0 3 3 0 8 0 amappl7 128 151 0 140 1 0 1 1 0 8 0 amappl6 120 463 0 439 2 1 1 2 0 8 0 amappl5 112 1512 0 1494 1 0 1 1 0 8 0 amappl4 104 2399 0 2363 2 0 2 2 0 8 1 amappl3 96 824 0 808 1 0 1 1 0 8 0 amappl2 88 883 0 840 3 1 2 3 0 8 0 amappl1 80 46712 0 46079 21 7 14 18 0 8 0 amappl 88 28117 0 27864 7 0 7 7 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 41 0 5 1 0 1 1 0 8 0 uaddrrnd 24 2423 0 2388 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2423 0 2388 1 0 1 1 0 8 0 vmmpekpl 168 22423 0 22371 3 0 3 3 0 8 0 vmmpepl 168 222531 0 219904 145 24 121 131 0 357 1 vmsppl 368 2422 0 2387 4 0 4 4 0 8 0 rwobjpl 56 57727 0 52265 79 1 78 78 0 8 0 pdppl 4096 4853 0 4774 157 76 81 93 0 8 2 pvpl 32 1145773 0 1126822 254 91 163 245 0 265 0 pmappl 248 2422 0 2387 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1103 0 108 29 0 29 29 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(fffffd80771b6480,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80771b6480,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd80771b6470) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002e38f670,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002e38f670,ffff80002e38f6a8,ffff80002e38f6d0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd80771b6468,20000000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002e38f800,20000300) at kpageflttrap+0x209 kerntrap(ffff80002e38f800) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 ifioctl_get(c0106924,ffff80002e38fab0) at ifioctl_get+0x2dd soo_ioctl(fffffd8077890398,c0106924,ffff80002e38fab0,ffff800022c42a90) at soo_ioctl+0x26c sys_ioctl(ffff800022c42a90,ffff80002e38fbc8,ffff80002e38fc20) at sys_ioctl+0x4a2 syscall(ffff80002e38fc90) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e38fc90) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x63913dc6cf0, count: -15 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 __mp_lock(ffffffff829de780) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x122 sys/kern/kern_lock.c:147 uvm_unmap_detach(ffff800021134f60,1) at uvm_unmap_detach+0x113 sys/uvm/uvm_map.c:1615 uvm_map_teardown(fffffd806eedfe68) at uvm_map_teardown+0x262 sys/uvm/uvm_map.c:2789 uvmspace_free(fffffd806eedfe68) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685 reaper(ffff8000210f9260) at reaper+0x18b sys/kern/kern_exit.c:457 end trace frame: 0x0, count: -8