login: witness: lock order reversal: 1st 0xffffffff8290fe50 netlock (netlock) 2nd 0xfffffd8068858480 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 fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307 #11 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #12 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 #13 sys_ioctl+0x4a2 #14 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #14 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #15 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(fffffd8068858480,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8068858480,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd8068858470) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002af2e030,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002af2e030,ffff80002af2e068,ffff80002af2e090) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd8068858468,20004000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002af2e1c0,200041ee) at kpageflttrap+0x209 kerntrap(ffff80002af2e1c0) 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,ffff80002af2e710) at ifioctl_get+0x2dd soo_ioctl(ffff80002af2e470,c0106924,ffff80002af2e710,ffff8000ffff7510) at soo_ioctl+0x26c fifo_ioctl(ffff80002af2e558) at fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307 VOP_IOCTL(fffffd8064964a28,c0106924,ffff80002af2e710,3,fffffd807f7d85a0,ffff8000ffff7510) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd807db809a0,c0106924,ffff80002af2e710,ffff8000ffff7510) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000ffff7510,ffff80002af2e828,ffff80002af2e880) at sys_ioctl+0x4a2 syscall(ffff80002af2e8f0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002af2e8f0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2f01f8a3c80, count: -18 ddb{0}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff80002af2dd20 rbx 0x3 rdx 0xffff800000bc2100 rcx 0 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffff80002af2dc90 r9 0x8080808080808080 r10 0x2d67b0cb5fc6b53b r11 0xd2c339467c9fa139 r12 0xffffffff82ab0010 w_lodata+0x526a0 r13 0 r14 0xffffffff82aaab80 w_lodata+0x4d210 r15 0xfffffd8002f62d80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002af2dd10 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=466769 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=74, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffefce8,0xffff8000ffff77c0 process=0xffff8000fffeba50 user=0xffff80002af29000, vmspace=0xfffffd8068858468 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 97792 247576 37441 32767 2 0x10 syz-executor.0 *97792 466769 37441 32767 7 0x4000010 syz-executor.0 42633 163709 81270 32767 2 0x10 syz-executor.6 42633 484819 81270 32767 3 0x4000090 fsleep syz-executor.6 36228 510819 32953 32767 2 0x10 syz-executor.4 74963 431920 24432 32767 2 0x10 syz-executor.2 74963 219722 24432 32767 3 0x4000090 fsleep syz-executor.2 48585 490007 50167 32767 2 0x10 syz-executor.3 79416 479367 51279 32767 2 0x10 syz-executor.1 31047 287500 27659 32767 2 0x10 syz-executor.7 50167 473627 76364 32767 3 0x90 nanoslp syz-executor.3 27659 28407 79884 0 3 0x82 wait syz-executor.7 81270 59431 62997 32767 3 0x90 nanoslp syz-executor.6 62997 266124 79884 0 3 0x82 wait syz-executor.6 32953 177050 59294 32767 3 0x90 nanoslp syz-executor.4 45206 389112 61416 32767 3 0x90 nanoslp syz-executor.5 59294 7023 79884 0 3 0x82 wait syz-executor.4 24432 496036 66633 32767 3 0x90 nanoslp syz-executor.2 61416 513028 79884 0 3 0x82 wait syz-executor.5 76364 140105 79884 0 3 0x82 wait syz-executor.3 66633 505827 79884 0 3 0x82 wait syz-executor.2 51279 152659 49695 32767 3 0x90 nanoslp syz-executor.1 37441 442606 21796 32767 3 0x90 nanoslp syz-executor.0 49695 135697 79884 0 3 0x82 wait syz-executor.1 21796 105096 79884 0 3 0x82 wait syz-executor.0 79884 433221 36957 0 3 0x82 thrsleep syz-fuzzer 79884 82352 36957 0 3 0x4000082 thrsleep syz-fuzzer 79884 68747 36957 0 3 0x4000082 thrsleep syz-fuzzer 79884 364534 36957 0 3 0x4000082 thrsleep syz-fuzzer 79884 32736 36957 0 3 0x4000082 thrsleep syz-fuzzer 79884 522803 36957 0 3 0x4000082 thrsleep syz-fuzzer 79884 327731 36957 0 3 0x4000082 kqread syz-fuzzer 79884 154215 36957 0 3 0x4000082 thrsleep syz-fuzzer 79884 46125 36957 0 3 0x4000082 thrsleep syz-fuzzer 36957 215955 99809 0 3 0x10008a sigsusp ksh 99809 139903 29991 0 3 0x9a kqread sshd 33236 25112 1 0 3 0x100083 ttyin getty 29991 504088 1 0 3 0x88 kqread sshd 57843 94931 54733 73 3 0x1100090 kqread syslogd 54733 216068 1 0 3 0x100082 netio syslogd 37779 177416 1 0 3 0x100080 kqread resolvd 84099 12262 46428 77 3 0x100092 kqread dhcpleased 71316 336844 46428 77 3 0x100092 kqread dhcpleased 46428 470691 1 0 3 0x80 kqread dhcpleased 25406 469511 0 0 3 0x14200 bored smr 21647 193183 0 0 2 0x14200 zerothread 10240 157880 0 0 3 0x14200 aiodoned aiodoned 75262 323168 0 0 3 0x14200 syncer update 25836 199451 0 0 3 0x14200 cleaner cleaner 45486 420212 0 0 7 0x14200 reaper 82820 491496 0 0 3 0x14200 pgdaemon pagedaemon 53906 310102 0 0 3 0x14200 bored viomb 39927 370341 0 0 3 0x40014200 acpi0 acpi0 2150 131545 0 0 3 0x40014200 idle1 30700 470790 0 0 3 0x14200 bored softnet 45606 30887 0 0 3 0x14200 bored systqmp 34843 252102 0 0 3 0x14200 bored systq 53194 4385 0 0 3 0x40014200 bored softclock 99934 212458 0 0 3 0x40014200 idle0 1 255478 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 97792 (syz-executor.0) thread 0xffff8000ffff7510 (466769) shared rwlock netlock r = 0 (0xffffffff8290fe50) #0 witness_lock+0x44d #1 ifioctl_get+0x2d5 sys/net/if.c:2319 #2 soo_ioctl+0x26c #3 fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307 #4 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #5 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 #6 sys_ioctl+0x4a2 #7 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #7 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #8 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff829de988) #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 10168 6406K 6419K 78643K 11258 0 pcb 13 8K 8K 78643K 13 0 rtable 240 6K 7K 78643K 360 0 ifaddr 81 16K 16K 78643K 82 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 2K 78643K 34 0 iov 0 0K 12K 78643K 3 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1271 79K 79K 78643K 1284 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 5 0 VM map 2 1K 1K 78643K 2 0 sem 3 0K 0K 78643K 3 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 24 89K 113K 78643K 395 0 sigio 0 0K 0K 78643K 1 0 proc 56 74K 99K 78643K 454 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 3 0 in_multi 99 6K 6K 78643K 102 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 31 148K 148K 78643K 31 0 exec 0 0K 2K 78643K 619 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 293 79K 80K 78643K 6018 0 UVM aobj 9 2K 2K 78643K 9 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 11 0K 2K 78643K 27 0 temp 93 4695K 4759K 78643K 4761 0 kqueue 12 18K 20K 78643K 23 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 41 0 38 1 0 1 1 0 8 0 rtentry 112 112 0 1 4 0 4 4 0 8 0 unpcb 136 85 0 70 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpcb 736 12 0 8 1 0 1 1 0 8 0 arp 120 18 0 0 1 0 1 1 0 8 0 inpcb 304 67 0 60 1 0 1 1 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 256 454 0 0 29 0 29 29 0 8 0 art_table 32 455 0 0 4 0 4 4 0 8 0 art_node 16 111 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 1 1 0 1 1 0 8 0 semapl 112 1 0 0 1 0 1 1 0 8 0 shmpl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1743 0 313 90 0 90 90 0 8 0 ffsino 272 1743 0 313 96 0 96 96 0 8 0 nchpl 144 2270 0 607 62 0 62 62 0 8 0 uvmvnodes 80 1856 0 0 38 0 38 38 0 8 0 vnodes 224 1856 0 0 110 0 110 110 0 8 0 namei 1024 6917 0 6917 2 1 1 2 0 8 1 percpumem 16 40 0 0 1 0 1 1 0 8 0 scxspl 216 7003 0 7003 2 1 1 2 0 8 1 plimitpl 152 30 0 8 1 0 1 1 0 8 0 sigapl 424 678 0 628 7 0 7 7 0 8 1 futexpl 64 626 0 624 1 0 1 1 0 8 0 knotepl 120 104 0 0 4 0 4 4 0 8 0 kqueuepl 216 23 0 15 1 0 1 1 0 8 0 pipepl 336 131 0 103 3 0 3 3 0 8 0 fdescpl 496 664 0 629 7 1 6 6 0 8 1 filepl 152 1876 0 1642 10 0 10 10 0 8 0 lockfpl 104 14 0 12 1 0 1 1 0 8 0 lockfspl 48 8 0 6 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 85 0 67 1 0 1 1 0 8 0 zombiepl 144 629 0 628 1 0 1 1 0 8 0 processpl 1064 678 0 628 5 1 4 4 0 8 0 procpl 672 943 0 881 6 0 6 6 0 8 0 sockpl 480 199 0 174 4 0 4 4 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 167 0 0 20 0 20 20 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 295 0 0 18 0 18 18 0 8 0 bufpl 288 3906 0 141 269 0 269 269 0 8 0 anonpl 24 126546 0 114540 81 2 79 80 0 186 0 amapchunkpl 152 13423 0 12726 33 1 32 32 0 158 4 amappl16 200 974 0 656 18 0 18 18 0 8 0 amappl15 192 118 0 111 1 0 1 1 0 8 0 amappl14 184 104 0 98 1 0 1 1 0 8 0 amappl13 176 80 0 78 1 0 1 1 0 8 0 amappl12 168 86 0 78 1 0 1 1 0 8 0 amappl11 160 127 0 115 1 0 1 1 0 8 0 amappl10 152 31 0 26 1 0 1 1 0 8 0 amappl9 144 469 0 463 1 0 1 1 0 8 0 amappl8 136 591 0 544 2 0 2 2 0 8 0 amappl7 128 152 0 137 1 0 1 1 0 8 0 amappl6 120 199 0 180 2 0 2 2 0 8 1 amappl5 112 368 0 351 1 0 1 1 0 8 0 amappl4 104 976 0 938 2 0 2 2 0 8 0 amappl3 96 247 0 232 1 0 1 1 0 8 0 amappl2 88 507 0 467 3 1 2 3 0 8 0 amappl1 80 14563 0 13952 18 2 16 18 0 8 1 amappl 88 5595 0 5364 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 8 0 0 1 0 1 1 0 8 0 uaddrrnd 24 664 0 629 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 664 0 629 1 0 1 1 0 8 0 vmmpekpl 168 9006 0 8971 2 0 2 2 0 8 0 vmmpepl 168 62048 0 59562 119 0 119 119 0 357 8 vmsppl 368 663 0 628 4 0 4 4 0 8 0 rwobjpl 56 16977 0 13905 45 1 44 44 0 8 0 pdppl 4096 1335 0 1256 115 34 81 89 0 8 2 pvpl 32 347309 0 330393 243 1 242 243 0 265 98 pmappl 248 663 0 628 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 657 0 37 18 0 18 18 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(fffffd8068858480,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8068858480,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd8068858470) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002af2e030,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002af2e030,ffff80002af2e068,ffff80002af2e090) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd8068858468,20004000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002af2e1c0,200041ee) at kpageflttrap+0x209 kerntrap(ffff80002af2e1c0) 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,ffff80002af2e710) at ifioctl_get+0x2dd soo_ioctl(ffff80002af2e470,c0106924,ffff80002af2e710,ffff8000ffff7510) at soo_ioctl+0x26c fifo_ioctl(ffff80002af2e558) at fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307 VOP_IOCTL(fffffd8064964a28,c0106924,ffff80002af2e710,3,fffffd807f7d85a0,ffff8000ffff7510) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd807db809a0,c0106924,ffff80002af2e710,ffff8000ffff7510) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000ffff7510,ffff80002af2e828,ffff80002af2e880) at sys_ioctl+0x4a2 syscall(ffff80002af2e8f0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002af2e8f0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2f01f8a3c80, count: -18 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(ffff800021135920,1) at uvm_unmap_detach+0x113 sys/uvm/uvm_map.c:1615 uvm_map_teardown(fffffd8068858018) at uvm_map_teardown+0x262 sys/uvm/uvm_map.c:2789 uvmspace_free(fffffd8068858018) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685 reaper(ffff8000210f9500) at reaper+0x18b sys/kern/kern_exit.c:457 end trace frame: 0x0, count: -8