witness: lock order reversal: 1st 0xffffffff829ac890 pf_lock (pf_lock) 2nd 0xffffffff8295ec00 netlock (netlock) lock order "netlock"(rwlock) -> "pf_lock"(rwlock) first seen at: #0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 #1 pfioctl+0x3fba sys/net/pf_ioctl.c:2966 #2 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #3 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 #4 sys_ioctl+0x4a2 #5 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #6 Xsyscall+0x128 lock order "pf_lock"(rwlock) -> "netlock"(rwlock) first seen at: #0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 #1 uvn_io+0x418 sys/uvm/uvm_vnode.c:1243 #2 uvn_get+0x1df sys/uvm/uvm_vnode.c:1076 #3 uvm_fault_lower+0x36c sys/uvm/uvm_fault.c:1275 #4 uvm_fault+0x248 #5 kpageflttrap+0x209 #6 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #7 alltraps_kern_meltdown+0x7b #8 copyin+0x53 #9 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #10 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 #11 sys_ioctl+0x4a2 #12 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #12 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #13 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(ffffffff8295ec00,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(ffffffff8295ec00,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(ffffffff8295ebf0) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 uvn_io(fffffd8062b30320,ffff80002af1c3d8,1,202,0) at uvn_io+0x418 sys/uvm/uvm_vnode.c:1243 uvn_get(fffffd8062b30320,0,ffff80002af1c498,ffff80002af1c468,0,1,8a3344096c685a60,0) at uvn_get+0x1df sys/uvm/uvm_vnode.c:1076 uvm_fault_lower(ffff80002af1c600,ffff80002af1c638,ffff80002af1c580,0) at uvm_fault_lower+0x36c sys/uvm/uvm_fault.c:1275 uvm_fault(fffffd8063b8d5c0,20004000,0,1) at uvm_fault+0x248 kpageflttrap(ffff80002af1c790,20004000) at kpageflttrap+0x209 kerntrap(ffff80002af1c790) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x53 VOP_IOCTL(fffffd8070e51b88,c0104453,ffff80002af1cb70,b,fffffd807f7d85a0,ffff800025483ce8) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8062790dc8,c0104453,ffff80002af1cb70,ffff800025483ce8) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 sys_ioctl(ffff800025483ce8,ffff80002af1cc88,ffff80002af1cce0) at sys_ioctl+0x4a2 syscall(ffff80002af1cd50) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002af1cd50) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x56f33520ac0, count: -16 ddb{0}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff80002af1c1a0 rbx 0x3 rdx 0xffff800000c46740 rcx 0 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffff80002af1c110 r9 0x8080808080808080 r10 0x9ce5c7aa43e900e9 r11 0x9eb3fe7de4075c2f r12 0xffffffff82b799a0 w_lodata+0x52b70 r13 0 r14 0xffffffff82b68c20 w_lodata+0x41df0 r15 0xfffffd8002f64780 rip 0xffffffff822911e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002af1c190 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.3) pid=356866 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff800025482a88,0xffff800025482558 process=0xffff800027acd0b8 user=0xffff80002af17000, vmspace=0xfffffd8063b8d5c0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 43883 64174 96303 0 2 0 syz-executor.2 43883 400767 96303 0 3 0x4000080 fsleep syz-executor.2 38096 361638 1628 0 2 0 syz-executor.4 95619 317457 21305 0 2 0 syz-executor.3 *95619 356866 21305 0 7 0x4000000 syz-executor.3 48050 425310 99683 0 3 0x80 nanoslp syz-executor.5 48050 409291 99683 0 3 0x4000080 kqread syz-executor.5 48050 329337 99683 0 3 0x4000080 fsleep syz-executor.5 60666 389162 50175 0 2 0 syz-executor.6 60666 420334 50175 0 3 0x4000080 fsleep syz-executor.6 74001 96482 19544 0 2 0x81000 syz-executor.7 74001 72269 19544 0 3 0x4003000 suspend syz-executor.7 56573 36714 26990 0 2 0 syz-executor.0 56573 28426 26990 0 3 0x4000080 fsleep syz-executor.0 39246 456964 52270 0 3 0x82 nanoslp syz-executor.1 96303 92689 52270 0 3 0x82 nanoslp syz-executor.2 99683 116453 52270 0 3 0x82 nanoslp syz-executor.5 76436 49781 1 0 3 0x100083 ttyin getty 1628 400837 52270 0 3 0x82 nanoslp syz-executor.4 50175 113987 52270 0 3 0x82 nanoslp syz-executor.6 21305 134210 52270 0 3 0x82 nanoslp syz-executor.3 72024 419803 0 0 3 0x14200 acct acct 32197 429173 0 0 3 0x14200 bored sosplice 19544 319425 52270 0 3 0x82 nanoslp syz-executor.7 26990 177160 52270 0 3 0x82 nanoslp syz-executor.0 52270 517402 86444 0 3 0x82 thrsleep syz-fuzzer 52270 287626 86444 0 3 0x4000082 thrsleep syz-fuzzer 52270 324283 86444 0 3 0x4000082 thrsleep syz-fuzzer 52270 485300 86444 0 3 0x4000082 thrsleep syz-fuzzer 52270 314434 86444 0 3 0x4000082 thrsleep syz-fuzzer 52270 455313 86444 0 3 0x4000082 thrsleep syz-fuzzer 52270 406744 86444 0 3 0x4000082 kqread syz-fuzzer 52270 129828 86444 0 3 0x4000082 thrsleep syz-fuzzer 52270 61811 86444 0 3 0x4000082 thrsleep syz-fuzzer 86444 319253 55861 0 3 0x10008a sigsusp ksh 55861 74766 21999 0 3 0x9a kqread sshd 21999 11104 1 0 3 0x88 kqread sshd 47866 395609 2082 74 3 0x1100092 bpf pflogd 2082 186001 1 0 3 0x80 netio pflogd 33558 169113 85354 73 3 0x1100090 kqread syslogd 85354 15984 1 0 3 0x100082 netio syslogd 10795 45231 1 0 3 0x100080 kqread resolvd 97227 496744 49286 77 3 0x100092 kqread dhcpleased 51812 284263 49286 77 3 0x100092 kqread dhcpleased 49286 284531 1 0 3 0x80 kqread dhcpleased 68706 126592 0 0 3 0x14200 bored smr 91824 227868 0 0 2 0x14200 zerothread 28299 348093 0 0 3 0x14200 aiodoned aiodoned 3781 254324 0 0 3 0x14200 syncer update 45460 21225 0 0 3 0x14200 cleaner cleaner 39490 107375 0 0 3 0x14200 reaper reaper 36370 114450 0 0 3 0x14200 pgdaemon pagedaemon 52468 4748 0 0 3 0x14200 bored viomb 71752 355125 0 0 3 0x40014200 acpi0 acpi0 93017 16186 0 0 7 0x40014200 idle1 45790 79143 0 0 3 0x14200 bored softnet 99563 350848 0 0 3 0x14200 bored systqmp 26286 6021 0 0 3 0x14200 bored systq 14455 354806 0 0 3 0x40014200 bored softclock 58185 113455 0 0 3 0x40014200 idle0 1 101556 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 95619 (syz-executor.3) thread 0xffff800025483ce8 (356866) exclusive rwlock pf_lock r = 0 (0xffffffff829ac890) #0 witness_lock+0x44d #1 pfioctl+0x47e7 #2 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #3 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 #4 sys_ioctl+0x4a2 #5 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829cd168) #0 witness_lock+0x44d #1 vn_ioctl+0x41 sys/kern/vfs_vnops.c:514 #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 10187 6515K 7540K 78643K 23873 0 pcb 13 18K 23K 78643K 7453 0 rtable 259 19K 22K 78643K 3673 0 ifaddr 89 20K 22K 78643K 1752 0 sysctl 2 0K 0K 78643K 2 0 counters 54 35K 36K 78643K 268 0 ioctlops 0 0K 8K 78643K 3298 0 iov 0 0K 20K 78643K 681 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1445 90K 91K 78643K 5559 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 113 0 VM map 2 1K 1K 78643K 2 0 sem 16 2K 2K 78643K 102 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 17 61K 89K 78643K 9050 0 sigio 0 0K 0K 78643K 130 0 proc 70 87K 124K 78643K 1684 0 subproc 104 6K 6K 78643K 434 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 556 0 in_multi 93 6K 7K 78643K 600 0 ether_multi 1 0K 0K 78643K 45 0 mrt 1 0K 0K 78643K 46 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 67 307K 307K 78643K 67 0 exec 0 0K 2K 78643K 2082 0 pfkey data 0 0K 0K 78643K 3 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 535 827K 827K 78643K 115365 0 UVM aobj 131 4K 4K 78643K 140 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 317 0 NDP 12 0K 2K 78643K 199 0 temp 169 4787K 4865K 78643K 91189 0 kqueue 13 20K 28K 78643K 518 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 120 375 0 372 3 2 1 2 0 8 0 rtentry 112 548 0 439 4 0 4 4 0 8 0 unpcb 136 5497 0 5479 80 78 2 9 0 8 1 syncache 296 44 0 44 12 12 0 1 0 8 0 tcpqe 32 4 0 4 2 2 0 1 0 8 0 tcpcb 736 3189 0 3111 108 100 8 19 0 8 0 arp 120 78 0 61 1 0 1 1 0 8 0 inpcb 304 14427 0 14343 130 116 14 16 0 8 7 rttmr 72 13 0 13 4 3 1 1 0 8 1 nd6 48 157 0 120 1 0 1 1 0 8 0 pkpcb 40 47 0 47 6 5 1 1 0 8 1 kcovpl 48 33 0 25 1 0 1 1 0 8 0 ppxss 1248 40 0 40 7 7 0 1 0 8 0 pfstscr 40 31 0 31 5 5 0 1 0 8 0 pffrag 232 34 0 30 2 1 1 1 0 482 0 pffrnode 88 34 0 30 2 1 1 1 0 8 0 pffrent 40 200 0 196 2 1 1 1 0 8 0 pfosfp 40 1432 0 1008 5 0 5 5 0 8 0 pfosfpen 112 1432 0 714 21 0 21 21 0 8 0 pfrktable 1344 853 0 847 4 3 1 2 0 8 0 pftag 88 6 0 0 1 0 1 1 0 8 0 pfqueue 264 6 0 6 2 1 1 1 0 8 1 pfstitem 24 53 0 51 1 0 1 1 0 8 0 pfstkey 112 161 0 159 1 0 1 1 0 8 0 pfstate 320 96 0 94 2 1 1 2 0 8 0 pfrule 1360 829 0 786 6 2 4 4 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2387 0 1835 57 14 43 49 0 8 0 art_table 32 2388 0 1835 7 0 7 7 0 8 0 art_node 16 542 0 446 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 4 1 0 1 1 0 8 0 semupl 112 5 0 5 2 2 0 1 0 8 0 semapl 112 92 0 78 1 0 1 1 0 8 0 shmpl 112 137 0 9 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 13114 0 11648 92 0 92 92 0 8 0 ffsino 272 13114 0 11648 98 0 98 98 0 8 0 nchpl 144 26551 0 24920 63 0 63 63 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 90010 0 90010 4 3 1 2 0 8 1 percpumem 16 146 0 107 1 0 1 1 0 8 0 vcpupl 2048 54 0 0 7 0 7 7 0 8 0 vmpool 560 137 0 83 4 0 4 4 0 8 0 pfiaddrpl 120 203 0 195 4 3 1 1 0 8 0 scsiplug 72 17 0 17 4 4 0 1 0 8 0 scxspl 216 68834 0 68834 19 18 1 8 0 8 1 plimitpl 152 1058 0 1043 1 0 1 1 0 8 0 sigapl 424 9328 0 9281 8 1 7 8 0 8 0 futexpl 64 78609 0 78605 1 0 1 1 0 8 0 knotepl 120 528 0 0 7 0 7 7 0 8 0 kqueuepl 216 1460 0 1451 27 22 5 5 0 8 4 pipepl 336 1417 0 1389 30 24 6 8 0 8 3 fdescpl 496 9292 0 9262 6 2 4 5 0 8 0 filepl 152 62400 0 62081 111 95 16 21 0 8 3 lockfpl 104 1887 0 1884 2 1 1 2 0 8 0 lockfspl 48 651 0 648 1 0 1 1 0 8 0 sessionpl 144 51 0 34 1 0 1 1 0 8 0 pgrppl 48 78 0 61 1 0 1 1 0 8 0 ucredpl 96 5961 0 5946 1 0 1 1 0 8 0 zombiepl 144 9282 0 9281 2 1 1 1 0 8 0 processpl 1064 9328 0 9281 5 0 5 5 0 8 0 procpl 672 25524 0 25462 16 8 8 9 0 8 0 srpgc 96 38 0 38 7 6 1 1 0 8 1 sosppl 168 33 0 33 7 7 0 1 0 8 0 sockpl 480 20447 0 20342 374 349 25 34 0 8 11 mcl64k 65536 25 0 0 4 1 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 3 0 3 3 0 8 0 mcl4k 4096 20 0 0 3 0 3 3 0 8 0 mcl2k2 2112 17 0 0 2 0 2 2 0 8 0 mcl2k 2048 257 0 0 21 1 20 21 0 8 0 mtagpl 96 511 0 0 10 0 10 10 0 8 0 mbufpl 256 924 0 0 50 0 50 50 0 8 0 bufpl 288 16095 0 9759 453 0 453 453 0 8 0 anonpl 24 2753701 0 2733689 345 198 147 173 0 186 15 amapchunkpl 152 293424 0 292522 94 55 39 51 0 158 1 amappl16 200 34356 0 33608 228 180 48 59 0 8 8 amappl15 192 2743 0 2732 1 0 1 1 0 8 0 amappl14 184 313 0 308 1 0 1 1 0 8 0 amappl13 176 1484 0 1482 1 0 1 1 0 8 0 amappl12 168 876 0 872 2 1 1 1 0 8 0 amappl11 160 876 0 859 1 0 1 1 0 8 0 amappl10 152 562 0 558 1 0 1 1 0 8 0 amappl9 144 2389 0 2383 1 0 1 1 0 8 0 amappl8 136 1740 0 1639 4 0 4 4 0 8 0 amappl7 128 699 0 687 1 0 1 1 0 8 0 amappl6 120 2193 0 2167 2 1 1 2 0 8 0 amappl5 112 8781 0 8760 1 0 1 1 0 8 0 amappl4 104 3097 0 3059 3 1 2 2 0 8 0 amappl3 96 1824 0 1810 1 0 1 1 0 8 0 amappl2 88 2584 0 2532 3 1 2 3 0 8 0 amappl1 80 168282 0 167692 25 11 14 19 0 8 1 amappl 88 114169 0 113843 9 1 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 72 139 0 9 3 0 3 3 0 8 0 uaddrrnd 24 9429 0 9345 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 9429 0 9345 1 0 1 1 0 8 0 vmmpekpl 168 67310 0 67239 4 0 4 4 0 8 0 vmmpepl 168 855026 0 852134 297 155 142 154 0 357 9 vmsppl 368 9428 0 9345 8 0 8 8 0 8 0 rwobjpl 56 217197 0 209292 137 21 116 116 0 8 3 pdppl 4096 18865 0 18744 483 360 123 123 0 8 2 pvpl 32 4494452 0 4470164 515 283 232 269 0 265 17 pmappl 248 9428 0 9345 6 0 6 6 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1437 0 507 27 0 27 27 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(ffffffff8295ec00,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(ffffffff8295ec00,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(ffffffff8295ebf0) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 uvn_io(fffffd8062b30320,ffff80002af1c3d8,1,202,0) at uvn_io+0x418 sys/uvm/uvm_vnode.c:1243 uvn_get(fffffd8062b30320,0,ffff80002af1c498,ffff80002af1c468,0,1,8a3344096c685a60,0) at uvn_get+0x1df sys/uvm/uvm_vnode.c:1076 uvm_fault_lower(ffff80002af1c600,ffff80002af1c638,ffff80002af1c580,0) at uvm_fault_lower+0x36c sys/uvm/uvm_fault.c:1275 uvm_fault(fffffd8063b8d5c0,20004000,0,1) at uvm_fault+0x248 kpageflttrap(ffff80002af1c790,20004000) at kpageflttrap+0x209 kerntrap(ffff80002af1c790) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x53 VOP_IOCTL(fffffd8070e51b88,c0104453,ffff80002af1cb70,b,fffffd807f7d85a0,ffff800025483ce8) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8062790dc8,c0104453,ffff80002af1cb70,ffff800025483ce8) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 sys_ioctl(ffff800025483ce8,ffff80002af1cc88,ffff80002af1cce0) at sys_ioctl+0x4a2 syscall(ffff80002af1cd50) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002af1cd50) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x56f33520ac0, count: -16 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 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020ce8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: -5