witness: lock order reversal: 1st 0xffffffff8290fe50 netlock (netlock) 2nd 0xfffffd80690821a0 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(fffffd80690821a0,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80690821a0,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd8069082190) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002e355880,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002e355880,ffff80002e3558b8,ffff80002e3558e0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd8069082188,3fffff000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002e355a10,3ffffffff) at kpageflttrap+0x209 kerntrap(ffff80002e355a10) 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,ffff80002e355cc0) at ifioctl_get+0x2dd soo_ioctl(fffffd8073ae5e60,c0106924,ffff80002e355cc0,ffff80002e3577b0) at soo_ioctl+0x26c sys_ioctl(ffff80002e3577b0,ffff80002e355dd8,ffff80002e355e30) at sys_ioctl+0x4a2 syscall(ffff80002e355ea0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e355ea0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x56563e23a40, count: -15 ddb{0}> show registers rdi 0x3 rsi 0xffffffff8294abb0 __sancov_gen_cov_switch_values.134 rbp 0xffff80002e355570 rbx 0x3 rdx 0 rcx 0 rax 0xffff80002e3577b0 r8 0xffff80002e3554e0 r9 0x8080808080808080 r10 0xfa62a3ed513fa2ee r11 0x2ba23b3cfa1933a2 r12 0xffffffff82ab06f0 w_lodata+0x52d80 r13 0 r14 0xffffffff82aa4e00 w_lodata+0x47490 r15 0xfffffd8002f62d80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e355560 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.5) pid=220114 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff80002e3562b0,0xffffffff82b3d400 process=0xffff80002a940448 user=0xffff80002e350000, vmspace=0xfffffd8069082188 estcpu=31, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 55864 492634 66828 32767 2 0x10 syz-executor.5 *55864 220114 66828 32767 7 0x4000010 syz-executor.5 91695 163429 80723 32767 3 0x90 nanoslp syz-executor.3 91695 517621 80723 32767 3 0x4000090 netio syz-executor.3 91695 451912 80723 32767 3 0x4000090 fsleep syz-executor.3 66828 406531 29114 32767 3 0x90 nanoslp syz-executor.5 29114 173536 6017 0 3 0x82 wait syz-executor.5 37279 232747 0 0 3 0x14200 bored sosplice 86759 225471 51533 32767 3 0x10 biowait syz-executor.6 7137 186971 56521 32767 3 0x90 piperd syz-executor.7 56521 513175 6017 0 3 0x82 wait syz-executor.7 51533 189638 6017 0 3 0x82 wait syz-executor.6 52488 354545 17203 32767 3 0x90 piperd syz-executor.4 80723 319661 42003 32767 3 0x90 nanoslp syz-executor.3 61537 169444 31074 32767 3 0x90 nanoslp syz-executor.2 17203 246926 6017 0 3 0x82 wait syz-executor.4 78600 39618 21561 32767 3 0x90 piperd syz-executor.1 42003 451323 6017 0 3 0x82 wait syz-executor.3 30182 287385 3133 32767 3 0x90 piperd syz-executor.0 31074 225871 6017 0 3 0x82 wait syz-executor.2 21561 63772 6017 0 3 0x82 wait syz-executor.1 3133 265742 6017 0 3 0x82 wait syz-executor.0 6017 185984 66535 0 3 0x82 kqread syz-fuzzer 6017 9311 66535 0 3 0x4000082 nanoslp syz-fuzzer 6017 196645 66535 0 3 0x4000082 thrsleep syz-fuzzer 6017 41343 66535 0 3 0x4000082 thrsleep syz-fuzzer 6017 455442 66535 0 3 0x4000082 thrsleep syz-fuzzer 6017 126710 66535 0 3 0x4000082 thrsleep syz-fuzzer 6017 66711 66535 0 3 0x4000082 thrsleep syz-fuzzer 6017 75132 66535 0 3 0x4000082 thrsleep syz-fuzzer 6017 214020 66535 0 3 0x4000082 thrsleep syz-fuzzer 6017 232124 66535 0 3 0x4000082 thrsleep syz-fuzzer 66535 392383 4496 0 3 0x10008a sigsusp ksh 4496 450669 96513 0 3 0x9a kqread sshd 38609 290964 1 0 3 0x100083 ttyin getty 96513 410429 1 0 3 0x88 kqread sshd 10727 48673 42318 73 3 0x1100090 kqread syslogd 42318 454243 1 0 3 0x100082 netio syslogd 72325 519722 1 0 3 0x100080 kqread resolvd 47164 338615 11584 77 3 0x100092 kqread dhcpleased 36289 430010 11584 77 3 0x100092 kqread dhcpleased 11584 449235 1 0 3 0x80 kqread dhcpleased 47959 38982 0 0 3 0x14200 bored smr 1943 195114 0 0 2 0x14200 zerothread 5526 203632 0 0 3 0x14200 aiodoned aiodoned 45212 468333 0 0 3 0x14200 syncer update 27665 274827 0 0 3 0x14200 cleaner cleaner 40757 42943 0 0 7 0x14200 reaper 29609 29959 0 0 3 0x14200 pgdaemon pagedaemon 19608 251984 0 0 3 0x14200 bored viomb 99612 486388 0 0 3 0x40014200 acpi0 acpi0 40455 479332 0 0 3 0x40014200 idle1 87376 254888 0 0 3 0x14200 bored softnet 1669 396077 0 0 3 0x14200 bored systqmp 85142 26623 0 0 3 0x14200 bored systq 72759 304319 0 0 3 0x40014200 bored softclock 86742 201874 0 0 3 0x40014200 idle0 1 293050 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 55864 (syz-executor.5) thread 0xffff80002e3577b0 (220114) 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 Process 86759 (syz-executor.6) thread 0xffff8000fffef7a8 (225471) exclusive rrwlock inode r = 0 (0xfffffd806e3fa0a0) #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 (0xfffffd8067fd63d0) #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10175 6407K 6419K 78643K 11271 0 pcb 13 10K 12K 78643K 15 0 rtable 256 7K 7K 78643K 489 0 ifaddr 81 16K 16K 78643K 96 0 counters 56 35K 35K 78643K 60 0 ioctlops 0 0K 2K 78643K 39 0 iov 0 0K 16K 78643K 347 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1270 79K 79K 78643K 1784 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 12 0K 0K 78643K 413 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 20 73K 121K 78643K 2742 0 sigio 0 0K 0K 78643K 255 0 proc 56 74K 111K 78643K 624 0 subproc 104 6K 6K 78643K 130 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 126 0 in_multi 99 6K 7K 78643K 167 0 ether_multi 1 0K 0K 78643K 10 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 67 307K 307K 78643K 67 0 exec 0 0K 2K 78643K 968 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 312 85K 96K 78643K 36325 0 UVM aobj 131 4K 4K 78643K 141 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 257 0 NDP 11 0K 2K 78643K 33 0 temp 125 4707K 4771K 78643K 10256 0 kqueue 13 20K 24K 78643K 196 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 120 183 0 180 3 2 1 3 0 8 0 rtentry 112 142 0 23 4 0 4 4 0 8 0 unpcb 136 2628 0 2612 17 14 3 6 0 8 2 syncache 296 24 0 24 7 6 1 1 0 8 1 tcpqe 32 147 0 147 2 2 0 1 0 8 0 tcpcb 736 1539 0 1529 27 26 1 14 0 8 0 arp 120 22 0 4 1 0 1 1 0 8 0 ipq 40 3 0 3 1 1 0 1 0 8 0 ipqe 40 7 0 7 1 1 0 1 0 8 0 inpcb 304 3233 0 3224 25 16 9 9 0 8 8 ip6q 72 4 0 4 1 1 0 1 0 8 0 ip6af 40 10 0 10 1 1 0 1 0 8 0 nd6 48 39 0 6 1 0 1 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 613 0 88 33 0 33 33 0 8 0 art_table 32 614 0 88 5 0 5 5 0 8 0 art_node 16 141 0 32 1 0 1 1 0 8 0 sysvmsgpl 40 78 0 72 1 0 1 1 0 8 0 semapl 112 411 0 401 1 0 1 1 0 8 0 shmpl 112 138 0 10 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 4821 0 3392 90 0 90 90 0 8 0 ffsino 272 4821 0 3392 96 0 96 96 0 8 0 nchpl 144 8404 0 6784 62 0 62 62 0 8 0 uvmvnodes 80 4960 0 0 102 0 102 102 0 8 0 vnodes 224 4960 0 0 292 0 292 292 0 8 0 namei 1024 27111 0 27110 2 1 1 2 0 8 0 percpumem 16 42 0 2 1 0 1 1 0 8 0 scxspl 216 22444 0 22443 9 8 1 8 0 8 0 plimitpl 152 443 0 421 2 1 1 2 0 8 0 sigapl 424 3024 0 2977 7 0 7 7 0 8 0 futexpl 64 19937 0 19936 1 0 1 1 0 8 0 knotepl 120 190 0 0 7 1 6 6 0 8 0 kqueuepl 216 624 0 615 12 11 1 6 0 8 0 pipepl 336 424 0 396 13 10 3 8 0 8 0 fdescpl 496 3009 0 2978 7 2 5 6 0 8 0 filepl 152 17764 0 17524 40 24 16 20 0 8 5 lockfpl 104 1268 0 1265 1 0 1 1 0 8 0 lockfspl 48 309 0 306 1 0 1 1 0 8 0 sessionpl 144 25 0 9 1 0 1 1 0 8 0 pgrppl 48 37 0 21 1 0 1 1 0 8 0 ucredpl 96 2470 0 2452 1 0 1 1 0 8 0 zombiepl 144 2978 0 2977 1 0 1 1 0 8 0 processpl 1064 3024 0 2977 5 1 4 4 0 8 0 procpl 672 7855 0 7796 12 5 7 8 0 8 1 sosppl 168 38 0 38 3 3 0 1 0 8 0 sockpl 480 6087 0 6059 93 81 12 29 0 8 7 mcl64k 65536 19 0 0 3 0 3 3 0 8 0 mcl16k 16384 18 0 0 3 0 3 3 0 8 1 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 11 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 160 0 0 18 0 18 18 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 573 0 0 33 0 33 33 0 8 0 bufpl 288 6418 0 140 449 0 449 449 0 8 0 anonpl 24 813246 0 800270 163 59 104 128 0 186 12 amapchunkpl 152 94727 0 94022 57 23 34 47 0 158 1 amappl16 200 8703 0 8351 78 55 23 41 0 8 3 amappl15 192 215 0 206 1 0 1 1 0 8 0 amappl14 184 2 0 1 1 0 1 1 0 8 0 amappl13 176 95 0 93 1 0 1 1 0 8 0 amappl12 168 358 0 354 1 0 1 1 0 8 0 amappl11 160 697 0 683 1 0 1 1 0 8 0 amappl10 152 1017 0 1007 1 0 1 1 0 8 0 amappl9 144 702 0 698 1 0 1 1 0 8 0 amappl8 136 1025 0 949 3 0 3 3 0 8 0 amappl7 128 453 0 440 1 0 1 1 0 8 0 amappl6 120 427 0 404 2 1 1 2 0 8 0 amappl5 112 3573 0 3550 1 0 1 1 0 8 0 amappl4 104 1880 0 1844 2 0 2 2 0 8 0 amappl3 96 633 0 621 1 0 1 1 0 8 0 amappl2 88 680 0 638 3 1 2 3 0 8 0 amappl1 80 55385 0 54809 19 4 15 18 0 8 0 amappl 88 35702 0 35475 8 1 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 72 140 0 10 3 0 3 3 0 8 0 uaddrrnd 24 3009 0 2978 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3009 0 2978 1 0 1 1 0 8 0 vmmpekpl 168 23996 0 23936 4 0 4 4 0 8 0 vmmpepl 168 274683 0 272363 157 33 124 138 0 357 6 vmsppl 368 3008 0 2977 4 0 4 4 0 8 0 rwobjpl 56 71569 0 65213 94 4 90 91 0 8 0 pdppl 4096 6025 0 5954 155 74 81 93 0 8 10 pvpl 32 1430935 0 1413151 278 93 185 261 0 265 24 pmappl 248 3008 0 2977 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 940 0 114 24 0 24 24 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(fffffd80690821a0,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80690821a0,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd8069082190) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002e355880,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002e355880,ffff80002e3558b8,ffff80002e3558e0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd8069082188,3fffff000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002e355a10,3ffffffff) at kpageflttrap+0x209 kerntrap(ffff80002e355a10) 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,ffff80002e355cc0) at ifioctl_get+0x2dd soo_ioctl(fffffd8073ae5e60,c0106924,ffff80002e355cc0,ffff80002e3577b0) at soo_ioctl+0x26c sys_ioctl(ffff80002e3577b0,ffff80002e355dd8,ffff80002e355e30) at sys_ioctl+0x4a2 syscall(ffff80002e355ea0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e355ea0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x56563e23a40, 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(ffff800021135d80,1) at uvm_unmap_detach+0x113 sys/uvm/uvm_map.c:1615 uvm_map_teardown(fffffd8069082e78) at uvm_map_teardown+0x262 sys/uvm/uvm_map.c:2789 uvmspace_free(fffffd8069082e78) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685 reaper(ffff8000210f8a80) at reaper+0x18b sys/kern/kern_exit.c:457 end trace frame: 0x0, count: -8