witness: lock order reversal: 1st 0xffffffff8290fe50 netlock (netlock) 2nd 0xfffffd806c7e35f0 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{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(fffffd806c7e35f0,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806c7e35f0,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd806c7e35e0) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002e3cb100,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002e3cb100,ffff80002e3cb138,ffff80002e3cb160) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd806c7e35d8,20000000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002e3cb290,20000300) at kpageflttrap+0x209 kerntrap(ffff80002e3cb290) 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,ffff80002e3cb540) at ifioctl_get+0x2dd soo_ioctl(fffffd80764a55f0,c0106924,ffff80002e3cb540,ffff80002e3627f0) at soo_ioctl+0x26c sys_ioctl(ffff80002e3627f0,ffff80002e3cb658,ffff80002e3cb6b0) at sys_ioctl+0x4a2 syscall(ffff80002e3cb720) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e3cb720) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x67651b5c560, count: -15 ddb{1}> show registers rdi 0x3 rsi 0xffffffff8294abb0 __sancov_gen_cov_switch_values.134 rbp 0xffff80002e3cadf0 rbx 0x3 rdx 0 rcx 0 rax 0xffff80002e3627f0 r8 0xffff80002e3cad60 r9 0x8080808080808080 r10 0xe527fe10e054d994 r11 0x84b9788645339a2d r12 0xffffffff82ab0590 w_lodata+0x52c20 r13 0 r14 0xffffffff82aa4880 w_lodata+0x46f10 r15 0xfffffd8002f62d80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e3cade0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.5) pid=227707 stat=onproc flags process=10 proc=4000000 pri=81, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff80002e362010,0xffff80002e362aa0 process=0xffff8000ffff2dd0 user=0xffff80002e3c6000, vmspace=0xfffffd806c7e35d8 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 26372 501613 9164 32767 2 0x10 syz-executor.0 26372 328313 9164 32767 2 0x4000010 syz-executor.0 40415 274195 30386 32767 2 0x10 syz-executor.2 40415 122363 30386 32767 3 0x4000090 fsleep syz-executor.2 73296 212520 49986 32767 2 0x10 syz-executor.7 73296 134315 49986 32767 3 0x4000090 fsleep syz-executor.7 55555 250063 22427 32767 3 0x90 nanoslp syz-executor.5 55555 27332 22427 32767 3 0x4000090 fsleep syz-executor.5 55555 277654 22427 32767 2 0x4000010 syz-executor.5 *55555 227707 22427 32767 7 0x4000010 syz-executor.5 55555 204525 22427 32767 2 0x4000010 syz-executor.5 55555 377924 22427 32767 2 0x4000010 syz-executor.5 91941 161246 72750 32767 2 0x10 syz-executor.6 72162 501868 56655 32767 2 0x10 syz-executor.4 72162 30381 56655 32767 3 0x4000090 fsleep syz-executor.4 15443 10254 29706 32767 7 0x10 syz-executor.3 15443 13708 29706 32767 3 0x4000090 fsleep syz-executor.3 15443 87714 29706 32767 2 0x4000010 syz-executor.3 40335 503182 79534 32767 2 0x10 syz-executor.1 40335 341223 79534 32767 3 0x4000090 kqread syz-executor.1 30386 323636 90916 32767 3 0x90 nanoslp syz-executor.2 90916 281464 66037 0 3 0x82 wait syz-executor.2 67120 349157 0 0 3 0x14200 bored sosplice 49986 259624 25741 32767 3 0x90 nanoslp syz-executor.7 72750 257926 30000 32767 3 0x90 nanoslp syz-executor.6 22427 334527 51509 32767 3 0x90 nanoslp syz-executor.5 30000 313859 66037 0 3 0x82 wait syz-executor.6 29706 127937 85677 32767 3 0x90 nanoslp syz-executor.3 25741 227248 66037 0 3 0x82 wait syz-executor.7 51509 311270 66037 0 3 0x82 wait syz-executor.5 56655 115212 66703 32767 3 0x90 nanoslp syz-executor.4 79534 432709 43217 32767 2 0x10 syz-executor.1 66703 304948 66037 0 3 0x82 wait syz-executor.4 85677 483844 66037 0 3 0x82 wait syz-executor.3 43217 125570 66037 0 3 0x82 wait syz-executor.1 9164 390718 25680 32767 3 0x90 nanoslp syz-executor.0 25680 124445 66037 0 3 0x82 wait syz-executor.0 66037 259391 48535 0 3 0x82 thrsleep syz-fuzzer 66037 144007 48535 0 3 0x4000082 thrsleep syz-fuzzer 66037 355501 48535 0 3 0x4000082 thrsleep syz-fuzzer 66037 359096 48535 0 3 0x4000082 thrsleep syz-fuzzer 66037 383030 48535 0 3 0x4000082 thrsleep syz-fuzzer 66037 254924 48535 0 3 0x4000082 thrsleep syz-fuzzer 66037 8672 48535 0 3 0x4000082 thrsleep syz-fuzzer 66037 384698 48535 0 3 0x4000082 thrsleep syz-fuzzer 66037 422105 48535 0 3 0x4000082 kqread syz-fuzzer 48535 158151 29531 0 3 0x10008a sigsusp ksh 29531 195927 60264 0 3 0x9a kqread sshd 80893 288400 1 0 3 0x100083 ttyin getty 60264 443390 1 0 3 0x88 kqread sshd 28560 191000 5156 73 3 0x1100090 kqread syslogd 5156 84735 1 0 3 0x100082 netio syslogd 19991 261659 1 0 3 0x100080 kqread resolvd 54677 231811 43828 77 3 0x100092 kqread dhcpleased 26770 249659 43828 77 3 0x100092 kqread dhcpleased 43828 324466 1 0 3 0x80 kqread dhcpleased 16764 352393 0 0 3 0x14200 bored smr 35300 18562 0 0 2 0x14200 zerothread 1902 286863 0 0 3 0x14200 aiodoned aiodoned 74062 306583 0 0 3 0x14200 syncer update 96656 491762 0 0 3 0x14200 cleaner cleaner 41277 94690 0 0 3 0x14200 reaper reaper 20472 403454 0 0 3 0x14200 pgdaemon pagedaemon 86571 109934 0 0 3 0x14200 bored viomb 11794 423707 0 0 3 0x40014200 acpi0 acpi0 87323 361894 0 0 3 0x40014200 idle1 3246 157241 0 0 3 0x14200 bored softnet 52927 72187 0 0 3 0x14200 bored systqmp 43846 233812 0 0 3 0x14200 bored systq 63543 279704 0 0 3 0x40014200 bored softclock 52743 285029 0 0 3 0x40014200 idle0 1 44093 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 55555 (syz-executor.5) thread 0xffff80002e3627f0 (227707) 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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10202 6411K 6419K 78643K 11300 0 pcb 13 12K 14K 78643K 17 0 rtable 252 7K 7K 78643K 659 0 ifaddr 81 16K 16K 78643K 96 0 sysctl 1 1K 3K 78643K 36 0 counters 56 35K 35K 78643K 60 0 ioctlops 0 0K 2K 78643K 52 0 iov 0 0K 16K 78643K 345 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1270 79K 79K 78643K 1724 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 41 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 854 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 26 97K 125K 78643K 3561 0 sigio 0 0K 0K 78643K 84 0 proc 56 74K 123K 78643K 631 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 1032 0 in_multi 99 6K 7K 78643K 179 0 ether_multi 1 0K 0K 78643K 24 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 229 1023K 1023K 78643K 229 0 exec 0 0K 2K 78643K 1002 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 386 88K 102K 78643K 46999 0 UVM aobj 54 6K 6K 78643K 60 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 80 0 NDP 11 0K 2K 78643K 33 0 temp 125 4707K 4771K 78643K 11700 0 kqueue 12 18K 26K 78643K 237 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 120 342 0 338 5 4 1 3 0 8 0 rtentry 112 144 0 27 4 0 4 4 0 8 0 unpcb 136 1680 0 1667 12 10 2 5 0 8 1 syncache 296 35 0 35 8 7 1 1 0 8 1 tcpqe 32 52 0 52 5 4 1 1 0 8 1 tcpcb 736 1174 0 1162 39 32 7 14 0 8 4 arp 120 22 0 4 1 0 1 1 0 8 0 ipq 40 2 0 1 1 0 1 1 0 8 0 ipqe 40 7 0 6 1 0 1 1 0 8 0 inpcb 304 5594 0 5579 68 59 9 12 0 8 6 ip6q 72 4 0 3 2 1 1 1 0 8 0 ip6af 40 7 0 6 2 1 1 1 0 8 0 nd6 48 41 0 10 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 256 600 0 95 32 0 32 32 0 8 0 art_table 32 601 0 95 5 0 5 5 0 8 0 art_node 16 143 0 36 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 12 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 852 0 842 1 0 1 1 0 8 0 shmpl 112 57 0 6 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 5897 0 4465 90 0 90 90 0 8 0 ffsino 272 5897 0 4465 96 0 96 96 0 8 0 nchpl 144 10881 0 9257 62 0 62 62 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 32819 0 32819 7 6 1 2 0 8 1 percpumem 16 42 0 2 1 0 1 1 0 8 0 scxspl 216 43117 0 43117 13 11 2 8 0 8 2 plimitpl 152 516 0 493 2 1 1 2 0 8 0 sigapl 424 3833 0 3781 7 1 6 7 0 8 0 futexpl 64 25957 0 25952 6 5 1 1 0 8 0 knotepl 120 156 0 0 4 0 4 4 0 8 0 kqueuepl 216 923 0 914 19 18 1 5 0 8 0 pipepl 336 571 0 542 14 8 6 6 0 8 3 fdescpl 496 3818 0 3781 7 2 5 6 0 8 0 filepl 152 22537 0 22298 53 40 13 17 0 8 3 lockfpl 104 285 0 283 1 0 1 1 0 8 0 lockfspl 48 110 0 108 1 0 1 1 0 8 0 sessionpl 144 25 0 9 1 0 1 1 0 8 0 pgrppl 48 570 0 554 1 0 1 1 0 8 0 ucredpl 96 2758 0 2740 1 0 1 1 0 8 0 zombiepl 144 3781 0 3781 1 0 1 1 0 8 1 processpl 1064 3833 0 3781 5 1 4 4 0 8 0 procpl 672 10016 0 9944 12 5 7 8 0 8 1 sosppl 168 17 0 17 4 3 1 1 0 8 1 sockpl 480 7712 0 7681 138 126 12 21 0 8 7 mcl64k 65536 26 0 0 4 1 3 3 0 8 0 mcl16k 16384 16 0 0 2 0 2 2 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 9 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 23 0 0 3 1 2 3 0 8 0 mcl2k2 2112 8 0 0 1 0 1 1 0 8 0 mcl2k 2048 243 0 0 19 0 19 19 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 690 0 0 38 0 38 38 0 8 0 bufpl 288 9085 0 2750 453 0 453 453 0 8 0 anonpl 24 1076739 0 1061988 195 82 113 141 0 186 12 amapchunkpl 152 117560 0 116683 85 50 35 47 0 158 1 amappl16 200 10398 0 10028 64 36 28 32 0 8 8 amappl15 192 514 0 506 1 0 1 1 0 8 0 amappl14 184 9 0 5 2 1 1 1 0 8 0 amappl13 176 563 0 558 1 0 1 1 0 8 0 amappl12 168 842 0 832 1 0 1 1 0 8 0 amappl11 160 202 0 192 1 0 1 1 0 8 0 amappl10 152 42 0 39 1 0 1 1 0 8 0 amappl9 144 1626 0 1615 1 0 1 1 0 8 0 amappl8 136 1138 0 1052 3 0 3 3 0 8 0 amappl7 128 557 0 543 1 0 1 1 0 8 0 amappl6 120 1358 0 1325 3 1 2 2 0 8 0 amappl5 112 3220 0 3198 1 0 1 1 0 8 0 amappl4 104 1202 0 1175 2 0 2 2 0 8 0 amappl3 96 1148 0 1131 1 0 1 1 0 8 0 amappl2 88 1511 0 1464 3 1 2 3 0 8 0 amappl1 80 69312 0 68666 19 4 15 18 0 8 0 amappl 88 46405 0 46111 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 59 0 6 1 0 1 1 0 8 0 uaddrrnd 24 3818 0 3781 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3818 0 3781 1 0 1 1 0 8 0 vmmpekpl 168 32654 0 32604 3 0 3 3 0 8 0 vmmpepl 168 347403 0 344577 170 38 132 132 0 357 9 vmsppl 368 3817 0 3781 4 0 4 4 0 8 0 rwobjpl 56 89460 0 82114 108 2 106 106 0 8 0 pdppl 4096 7643 0 7562 182 101 81 95 0 8 0 pvpl 32 1972902 0 1952570 343 149 194 259 0 265 21 pmappl 248 3817 0 3781 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 993 0 151 25 0 25 25 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f kd_curproc sys/dev/kcov.c:578 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f sys/dev/kcov.c:148 __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 intr_handler(ffff800022c329d0,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+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x129 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: 0x7f7ffffd5770, count: -10 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(fffffd806c7e35f0,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806c7e35f0,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd806c7e35e0) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002e3cb100,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002e3cb100,ffff80002e3cb138,ffff80002e3cb160) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd806c7e35d8,20000000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002e3cb290,20000300) at kpageflttrap+0x209 kerntrap(ffff80002e3cb290) 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,ffff80002e3cb540) at ifioctl_get+0x2dd soo_ioctl(fffffd80764a55f0,c0106924,ffff80002e3cb540,ffff80002e3627f0) at soo_ioctl+0x26c sys_ioctl(ffff80002e3627f0,ffff80002e3cb658,ffff80002e3cb6b0) at sys_ioctl+0x4a2 syscall(ffff80002e3cb720) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e3cb720) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x67651b5c560, count: -15