witness: lock order reversal: 1st 0xffffffff8290fe50 netlock (netlock) 2nd 0xfffffd8069376a40 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{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+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(fffffd8069376a40,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8069376a40,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd8069376a30) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff800029740be0,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff800029740be0,ffff800029740c18,ffff800029740c40) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd8069376a28,20ff9000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff800029740d70,20ff9000) at kpageflttrap+0x209 kerntrap(ffff800029740d70) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 soo_ioctl(fffffd8062976740,c028698d,ffff800029740f90,ffff800022c55ce8) at soo_ioctl+0x26c sys_ioctl(ffff800022c55ce8,ffff8000297410a8,ffff800029741100) at sys_ioctl+0x4a2 syscall(ffff800029741170) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800029741170) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2cb9b2bb7f0, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff8000297408d0 rbx 0x3 rdx 0xffff800000be6900 rcx 0 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffff800029740840 r9 0x8080808080808080 r10 0x83ebf4b3f545d012 r11 0x836830223d734847 r12 0xffffffff82ab07a0 w_lodata+0x52e30 r13 0 r14 0xffffffff82aaa290 w_lodata+0x4c920 r15 0xfffffd8002f62d80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000297408c0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.4) pid=113731 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=66, nice=20 forw=0xffffffffffffffff, list=0xffff800022c547e8,0xffffffff82b3d400 process=0xffff8000294e14e8 user=0xffff80002973c000, vmspace=0xfffffd8069376a28 estcpu=16, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 91778 248547 40481 32767 2 0x10 syz-executor.1 76645 408511 72499 32767 2 0x10 syz-executor.2 76645 6626 72499 32767 3 0x4000090 kqpoll syz-executor.2 19595 198073 74385 32767 2 0x10 syz-executor.7 19595 95152 74385 32767 3 0x4000090 fsleep syz-executor.7 25993 174999 26451 32767 2 0x10 syz-executor.0 25993 232334 26451 32767 3 0x4000090 fsleep syz-executor.0 60933 110763 95275 32767 7 0x10 syz-executor.4 *60933 113731 95275 32767 7 0x4000010 syz-executor.4 48179 409011 99313 32767 2 0x10 syz-executor.6 48179 84162 99313 32767 3 0x4000090 fsleep syz-executor.6 87704 326805 0 0 3 0x14200 bored sosplice 95275 18121 17144 32767 3 0x90 nanoslp syz-executor.4 74385 436842 24400 32767 3 0x90 nanoslp syz-executor.7 99313 101701 72355 32767 3 0x90 nanoslp syz-executor.6 17144 441125 99886 0 3 0x82 wait syz-executor.4 24400 40289 99886 0 3 0x82 wait syz-executor.7 72355 43521 99886 0 3 0x82 wait syz-executor.6 26490 124820 58575 32767 3 0x90 nanoslp syz-executor.5 58575 393092 99886 0 3 0x82 wait syz-executor.5 8269 302410 94469 32767 3 0x90 nanoslp syz-executor.3 72499 36653 2399 32767 3 0x90 nanoslp syz-executor.2 94469 222920 99886 0 3 0x82 wait syz-executor.3 40481 18639 67926 32767 3 0x90 nanoslp syz-executor.1 2399 170985 99886 0 3 0x82 wait syz-executor.2 26451 182455 56984 32767 3 0x90 nanoslp syz-executor.0 67926 480372 99886 0 3 0x82 wait syz-executor.1 56984 399159 99886 0 3 0x82 wait syz-executor.0 99886 163748 89188 0 3 0x82 thrsleep syz-fuzzer 99886 431373 89188 0 3 0x4000082 nanoslp syz-fuzzer 99886 149322 89188 0 3 0x4000082 thrsleep syz-fuzzer 99886 284821 89188 0 3 0x4000082 kqread syz-fuzzer 99886 36034 89188 0 3 0x4000082 thrsleep syz-fuzzer 99886 349024 89188 0 3 0x4000082 thrsleep syz-fuzzer 99886 409894 89188 0 3 0x4000082 thrsleep syz-fuzzer 99886 37756 89188 0 3 0x4000082 thrsleep syz-fuzzer 99886 292621 89188 0 3 0x4000082 thrsleep syz-fuzzer 89188 23401 36623 0 3 0x10008a sigsusp ksh 36623 65181 43371 0 3 0x9a kqread sshd 34293 408089 1 0 3 0x100083 ttyin getty 43371 259054 1 0 3 0x88 kqread sshd 81879 120855 73705 73 3 0x1100090 kqread syslogd 73705 229262 1 0 3 0x100082 netio syslogd 61957 495096 1 0 3 0x100080 kqread resolvd 29906 12754 12706 77 3 0x100092 kqread dhcpleased 2843 135423 12706 77 3 0x100092 kqread dhcpleased 12706 360518 1 0 3 0x80 kqread dhcpleased 83583 286886 0 0 3 0x14200 bored smr 73496 195704 0 0 2 0x14200 zerothread 48808 29684 0 0 3 0x14200 aiodoned aiodoned 64070 441793 0 0 3 0x14200 syncer update 75809 53664 0 0 3 0x14200 cleaner cleaner 28721 335174 0 0 3 0x14200 reaper reaper 25920 19816 0 0 3 0x14200 pgdaemon pagedaemon 60158 302445 0 0 3 0x14200 bored viomb 22772 436722 0 0 3 0x40014200 acpi0 acpi0 17994 181340 0 0 3 0x40014200 idle1 48138 518507 0 0 3 0x14200 bored softnet 7699 307063 0 0 3 0x14200 bored systqmp 40712 370329 0 0 3 0x14200 bored systq 1661 143380 0 0 3 0x40014200 bored softclock 55705 47212 0 0 3 0x40014200 idle0 1 348380 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 60933 (syz-executor.4) thread 0xffff800022c55ce8 (113731) shared rwlock netlock r = 0 (0xffffffff8290fe50) #0 witness_lock+0x44d #1 ifioctl_get+0x81 if_getgrouplist sys/net/if.c:2911 [inline] #1 ifioctl_get+0x81 sys/net/if.c:2337 #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10173 6407K 6419K 78643K 11263 0 pcb 13 8K 8K 78643K 13 0 rtable 240 6K 7K 78643K 361 0 ifaddr 81 16K 16K 78643K 82 0 sysctl 1 1K 1K 78643K 2 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 2K 78643K 35 0 iov 0 0K 12K 78643K 14 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1271 79K 79K 78643K 1290 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 3 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 39 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 24 89K 109K 78643K 549 0 sigio 0 0K 0K 78643K 4 0 proc 56 74K 111K 78643K 475 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 22 0 in_multi 99 6K 6K 78643K 107 0 ether_multi 1 0K 0K 78643K 4 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 2K 78643K 615 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 320 84K 84K 78643K 7876 0 UVM aobj 7 2K 2K 78643K 8 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 11 0 NDP 11 0K 2K 78643K 27 0 temp 106 4702K 4766K 78643K 5108 0 kqueue 12 18K 22K 78643K 42 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> 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 49 0 46 1 0 1 1 0 8 0 rtentry 112 112 0 1 4 0 4 4 0 8 0 unpcb 136 123 0 107 1 0 1 1 0 8 0 syncache 296 10 0 10 3 2 1 1 0 8 1 tcpqe 32 117 0 117 3 2 1 1 0 8 1 tcpcb 736 112 0 102 3 0 3 3 0 8 1 arp 120 18 0 0 1 0 1 1 0 8 0 inpcb 304 239 0 228 2 0 2 2 0 8 0 nd6 48 25 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 465 0 0 30 0 30 30 0 8 0 art_table 32 466 0 0 4 0 4 4 0 8 0 art_node 16 111 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 24 0 12 1 0 1 1 0 8 0 semapl 112 33 0 23 1 0 1 1 0 8 0 shmpl 112 5 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1951 0 520 90 0 90 90 0 8 0 ffsino 272 1951 0 520 96 0 96 96 0 8 0 nchpl 144 2698 0 1034 62 0 62 62 0 8 0 uvmvnodes 80 2064 0 0 43 0 43 43 0 8 0 vnodes 224 2064 0 0 122 0 122 122 0 8 0 namei 1024 8187 0 8187 2 1 1 2 0 8 1 percpumem 16 40 0 0 1 0 1 1 0 8 0 scxspl 216 8326 0 8326 10 7 3 8 0 8 3 plimitpl 152 74 0 51 1 0 1 1 0 8 0 sigapl 424 824 0 772 7 1 6 7 0 8 0 futexpl 64 2328 0 2325 1 0 1 1 0 8 0 knotepl 120 326 0 0 10 0 10 10 0 8 0 kqueuepl 216 84 0 74 1 0 1 1 0 8 0 pipepl 336 139 0 111 3 0 3 3 0 8 0 fdescpl 496 809 0 774 7 2 5 6 0 8 0 filepl 152 2727 0 2490 11 0 11 11 0 8 1 lockfpl 104 53 0 51 1 0 1 1 0 8 0 lockfspl 48 22 0 20 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 23 0 7 1 0 1 1 0 8 0 ucredpl 96 361 0 343 1 0 1 1 0 8 0 zombiepl 144 774 0 772 1 0 1 1 0 8 0 processpl 1064 824 0 772 5 1 4 4 0 8 0 procpl 672 1332 0 1267 6 0 6 6 0 8 0 sosppl 168 20 0 19 1 0 1 1 0 8 0 sockpl 480 411 0 381 7 1 6 6 0 8 1 mcl64k 65536 6 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 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 10 0 0 2 0 2 2 0 8 0 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 150 0 0 18 0 18 18 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 674 0 0 42 0 42 42 0 8 0 bufpl 288 4050 0 139 280 0 280 280 0 8 0 anonpl 24 184134 0 171223 102 15 87 100 0 186 5 amapchunkpl 152 17999 0 17226 34 1 33 33 0 158 2 amappl16 200 2278 0 1956 31 13 18 28 0 8 0 amappl15 192 148 0 139 1 0 1 1 0 8 0 amappl14 184 10 0 6 1 0 1 1 0 8 0 amappl13 176 135 0 133 1 0 1 1 0 8 0 amappl12 168 67 0 63 1 0 1 1 0 8 0 amappl11 160 174 0 158 1 0 1 1 0 8 0 amappl10 152 45 0 43 1 0 1 1 0 8 0 amappl9 144 585 0 577 1 0 1 1 0 8 0 amappl8 136 602 0 554 2 0 2 2 0 8 0 amappl7 128 165 0 150 1 0 1 1 0 8 0 amappl6 120 318 0 292 2 1 1 2 0 8 0 amappl5 112 501 0 482 1 0 1 1 0 8 0 amappl4 104 979 0 945 2 0 2 2 0 8 0 amappl3 96 231 0 217 1 0 1 1 0 8 0 amappl2 88 563 0 522 3 1 2 3 0 8 0 amappl1 80 16908 0 16279 18 4 14 18 0 8 0 amappl 88 7455 0 7201 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 7 0 1 1 0 1 1 0 8 0 uaddrrnd 24 809 0 774 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 809 0 774 1 0 1 1 0 8 0 vmmpekpl 168 9831 0 9787 3 0 3 3 0 8 0 vmmpepl 168 75730 0 73211 126 8 118 126 0 357 3 vmsppl 368 808 0 774 4 0 4 4 0 8 0 rwobjpl 56 21044 0 17732 47 0 47 47 0 8 0 pdppl 4096 1625 0 1548 113 32 81 87 0 8 4 pvpl 32 452072 0 434036 245 24 221 245 0 265 72 pmappl 248 808 0 774 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 693 0 35 19 0 19 19 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff829baff0) 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 intr_handler(ffff8000294e8fc0,ffff800000077500) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __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 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x1f end of kernel end trace frame: 0x7f7fffff5580, count: -9 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(fffffd8069376a40,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8069376a40,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd8069376a30) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff800029740be0,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff800029740be0,ffff800029740c18,ffff800029740c40) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd8069376a28,20ff9000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff800029740d70,20ff9000) at kpageflttrap+0x209 kerntrap(ffff800029740d70) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 soo_ioctl(fffffd8062976740,c028698d,ffff800029740f90,ffff800022c55ce8) at soo_ioctl+0x26c sys_ioctl(ffff800022c55ce8,ffff8000297410a8,ffff800029741100) at sys_ioctl+0x4a2 syscall(ffff800029741170) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800029741170) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2cb9b2bb7f0, count: -14