witness: lock order reversal: 1st 0xffffffff8290fe50 netlock (netlock) 2nd 0xfffffd806a7325f0 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(fffffd806a7325f0,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806a7325f0,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd806a7325e0) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002e4018a0,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002e4018a0,ffff80002e4018d8,ffff80002e401900) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd806a7325d8,20000000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002e401a30,20000300) at kpageflttrap+0x209 kerntrap(ffff80002e401a30) 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,ffff80002e401ce0) at ifioctl_get+0x2dd soo_ioctl(fffffd806a7218f8,c0106924,ffff80002e401ce0,ffff8000295107f0) at soo_ioctl+0x26c sys_ioctl(ffff8000295107f0,ffff80002e401df8,ffff80002e401e50) at sys_ioctl+0x4a2 syscall(ffff80002e401ec0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e401ec0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8f87df4e7e0, count: -15 ddb{1}> show registers rdi 0x3 rsi 0xffffffff8294abb0 __sancov_gen_cov_switch_values.134 rbp 0xffff80002e401590 rbx 0x3 rdx 0 rcx 0 rax 0xffff8000295107f0 r8 0xffff80002e401500 r9 0x8080808080808080 r10 0xd386c33e374e2d70 r11 0x93c6caca2b882ce9 r12 0xffffffff82ab0590 w_lodata+0x52c20 r13 0 r14 0xffffffff82aa15a0 w_lodata+0x43c30 r15 0xfffffd8002f62d80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e401580 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=312266 stat=onproc flags process=10 proc=4000000 pri=82, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff800029510d30,0xffff80002a92a550 process=0xffff8000ffff2580 user=0xffff80002e3fc000, vmspace=0xfffffd806a7325d8 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 77720 431407 46848 32767 2 0x10 syz-executor.2 77720 284527 46848 32767 3 0x4000090 netcon2 syz-executor.2 49604 79802 44691 32767 2 0x10 syz-executor.6 45558 171925 76829 32767 2 0x10 syz-executor.1 21024 361900 27158 32767 2 0x10 syz-executor.7 21024 484379 27158 32767 3 0x4000090 fsleep syz-executor.7 81803 219225 93684 32767 7 0x10 syz-executor.0 81803 138871 93684 32767 3 0x4000090 lockf syz-executor.0 *81803 312266 93684 32767 7 0x4000010 syz-executor.0 81803 420342 93684 32767 3 0x4000090 fsleep syz-executor.0 81803 405208 93684 32767 2 0x4000010 syz-executor.0 18979 239596 50069 32767 2 0x10 syz-executor.4 18979 363085 50069 32767 3 0x4000090 fsleep syz-executor.4 61384 439720 4326 32767 2 0x10 syz-executor.5 61384 144525 4326 32767 3 0x4000090 fsleep syz-executor.5 61384 206797 4326 32767 3 0x4000090 fsleep syz-executor.5 61384 484195 4326 32767 2 0x4000010 syz-executor.5 44691 61977 82288 32767 3 0x90 nanoslp syz-executor.6 82288 515140 14060 0 3 0x82 wait syz-executor.6 46848 439584 48324 32767 3 0x90 nanoslp syz-executor.2 48324 59506 14060 0 3 0x82 wait syz-executor.2 27158 468757 67678 32767 3 0x90 nanoslp syz-executor.7 67678 436704 14060 0 3 0x82 wait syz-executor.7 5014 1445 0 0 3 0x14200 bored sosplice 50069 452384 87322 32767 3 0x90 nanoslp syz-executor.4 4326 302262 22489 32767 3 0x90 nanoslp syz-executor.5 87322 472883 14060 0 3 0x82 wait syz-executor.4 22489 251447 14060 0 3 0x82 wait syz-executor.5 98183 343430 41919 32767 3 0x90 nanoslp syz-executor.3 41919 73382 14060 0 3 0x82 wait syz-executor.3 76829 408483 20220 32767 3 0x90 nanoslp syz-executor.1 93684 524112 31531 32767 3 0x90 nanoslp syz-executor.0 20220 466492 14060 0 3 0x82 wait syz-executor.1 31531 481471 14060 0 3 0x82 wait syz-executor.0 14060 261417 95683 0 3 0x82 thrsleep syz-fuzzer 14060 478654 95683 0 3 0x4000082 thrsleep syz-fuzzer 14060 116100 95683 0 3 0x4000082 thrsleep syz-fuzzer 14060 101297 95683 0 3 0x4000082 thrsleep syz-fuzzer 14060 2698 95683 0 3 0x4000082 thrsleep syz-fuzzer 14060 305094 95683 0 3 0x4000082 thrsleep syz-fuzzer 14060 359872 95683 0 3 0x4000082 thrsleep syz-fuzzer 14060 451117 95683 0 3 0x4000082 kqread syz-fuzzer 14060 68385 95683 0 3 0x4000082 thrsleep syz-fuzzer 95683 420970 81003 0 3 0x10008a sigsusp ksh 81003 278262 29248 0 3 0x9a kqread sshd 31837 118085 1 0 3 0x100083 ttyin getty 29248 11347 1 0 3 0x88 kqread sshd 45552 347439 77168 73 3 0x1100090 kqread syslogd 77168 512164 1 0 3 0x100082 netio syslogd 68947 93815 1 0 3 0x100080 kqread resolvd 76592 248085 19570 77 3 0x100092 kqread dhcpleased 9505 244994 19570 77 3 0x100092 kqread dhcpleased 19570 167195 1 0 3 0x80 kqread dhcpleased 96770 19503 0 0 3 0x14200 bored smr 53080 247157 0 0 2 0x14200 zerothread 79699 478432 0 0 3 0x14200 aiodoned aiodoned 58520 70461 0 0 3 0x14200 syncer update 21275 161323 0 0 3 0x14200 cleaner cleaner 82892 501799 0 0 3 0x14200 reaper reaper 92670 171368 0 0 3 0x14200 pgdaemon pagedaemon 58502 120194 0 0 3 0x14200 bored viomb 82165 113953 0 0 3 0x40014200 acpi0 acpi0 66451 464535 0 0 3 0x40014200 idle1 97777 27683 0 0 3 0x14200 bored softnet 56762 429081 0 0 3 0x14200 bored systqmp 41386 109037 0 0 3 0x14200 bored systq 96921 328579 0 0 3 0x40014200 bored softclock 57627 225638 0 0 3 0x40014200 idle0 1 193613 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 81803 (syz-executor.0) thread 0xffff8000295107f0 (312266) 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 10192 6410K 6419K 78643K 11304 0 pcb 13 12K 14K 78643K 17 0 rtable 270 7K 8K 78643K 1156 0 ifaddr 81 17K 17K 78643K 132 0 sysctl 3 1K 1K 78643K 3 0 counters 56 35K 35K 78643K 70 0 ioctlops 0 0K 2K 78643K 77 0 iov 0 0K 24K 78643K 1257 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1271 79K 79K 78643K 2758 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 13K 78643K 132 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1649 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 25 93K 121K 78643K 13194 0 sigio 1 0K 0K 78643K 187 0 proc 56 74K 111K 78643K 1176 0 subproc 104 6K 6K 78643K 195 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1397 0 in_multi 99 6K 7K 78643K 264 0 ether_multi 1 0K 0K 78643K 26 0 mrt 2 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 169 758K 758K 78643K 169 0 exec 0 0K 2K 78643K 1897 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 425 93K 109K 78643K 168117 0 UVM aobj 131 4K 4K 78643K 133 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 243 0 NDP 11 0K 2K 78643K 48 0 temp 125 4707K 4771K 78643K 33496 0 kqueue 12 18K 26K 78643K 832 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 120 918 0 913 14 13 1 3 0 8 0 rtentry 112 225 0 99 4 0 4 4 0 8 0 unpcb 136 9395 0 9382 71 66 5 6 0 8 4 syncache 296 141 0 141 24 23 1 1 0 8 1 tcpqe 32 48 0 48 12 12 0 1 0 8 0 tcpcb 736 4625 0 4613 156 148 8 21 0 8 6 arp 120 37 0 17 1 0 1 1 0 8 0 ipq 40 65 0 65 7 6 1 1 0 8 1 ipqe 40 2388 0 2388 7 6 1 1 0 8 1 inpcb 304 19536 0 19516 177 170 7 14 0 8 4 rttmr 72 8 0 8 2 2 0 1 0 8 0 ip6q 72 49 0 49 5 4 1 1 0 8 1 ip6af 40 98 0 98 5 4 1 1 0 8 1 nd6 48 75 0 37 1 0 1 1 0 8 0 kcovpl 48 15 0 7 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 940 0 386 37 2 35 35 0 8 0 art_table 32 941 0 386 5 0 5 5 0 8 0 art_node 16 224 0 108 1 0 1 1 0 8 0 sysvmsgpl 40 20 0 14 1 0 1 1 0 8 0 semapl 112 1647 0 1637 1 0 1 1 0 8 0 shmpl 112 130 0 2 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 17279 0 15839 91 0 91 91 0 8 0 ffsino 272 17279 0 15839 97 0 97 97 0 8 0 nchpl 144 33616 0 31990 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 99616 0 99616 4 3 1 2 0 8 1 percpumem 16 47 0 7 1 0 1 1 0 8 0 scxspl 216 100946 0 100946 33 32 1 8 0 8 1 plimitpl 152 1914 0 1892 9 8 1 2 0 8 0 sigapl 424 13456 0 13404 7 1 6 7 0 8 0 futexpl 64 99983 0 99978 4 3 1 1 0 8 0 knotepl 120 577 0 0 11 2 9 11 0 8 0 kqueuepl 216 4261 0 4252 76 75 1 6 0 8 0 pipepl 336 2046 0 2017 60 52 8 13 0 8 5 fdescpl 496 13441 0 13405 7 2 5 6 0 8 0 filepl 152 76969 0 76722 139 122 17 22 0 8 7 lockfpl 104 7066 0 7062 2 1 1 2 0 8 0 lockfspl 48 786 0 783 1 0 1 1 0 8 0 sessionpl 144 30 0 14 1 0 1 1 0 8 0 pgrppl 48 166 0 150 1 0 1 1 0 8 0 ucredpl 96 9811 0 9793 1 0 1 1 0 8 0 zombiepl 144 13405 0 13404 1 0 1 1 0 8 0 processpl 1064 13456 0 13404 5 1 4 4 0 8 0 procpl 672 36997 0 36927 29 22 7 8 0 8 0 sosppl 168 189 0 189 17 16 1 1 0 8 1 sockpl 480 30268 0 30236 502 490 12 33 0 8 8 mcl64k 65536 41 0 0 4 1 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 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 35 0 0 5 2 3 3 0 8 0 mcl4k 4096 33 0 0 3 0 3 3 0 8 0 mcl2k2 2112 10 0 0 1 0 1 1 0 8 0 mcl2k 2048 338 0 0 19 0 19 19 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 857 0 0 36 0 36 36 0 8 0 bufpl 288 21062 0 14730 453 0 453 453 0 8 0 anonpl 24 3749296 0 3734505 282 176 106 127 0 186 0 amapchunkpl 152 408939 0 408129 158 118 40 47 0 158 7 amappl16 200 35921 0 35534 182 161 21 34 0 8 0 amappl15 192 1527 0 1522 1 0 1 1 0 8 0 amappl14 184 146 0 140 1 0 1 1 0 8 0 amappl13 176 1650 0 1643 1 0 1 1 0 8 0 amappl12 168 1888 0 1880 1 0 1 1 0 8 0 amappl11 160 51 0 39 1 0 1 1 0 8 0 amappl10 152 2319 0 2309 1 0 1 1 0 8 0 amappl9 144 2105 0 2099 1 0 1 1 0 8 0 amappl8 136 5296 0 5144 6 0 6 6 0 8 0 amappl7 128 4335 0 4320 1 0 1 1 0 8 0 amappl6 120 1849 0 1817 3 2 1 2 0 8 0 amappl5 112 12779 0 12757 1 0 1 1 0 8 0 amappl4 104 1207 0 1175 2 0 2 2 0 8 0 amappl3 96 4220 0 4199 1 0 1 1 0 8 0 amappl2 88 4276 0 4225 3 1 2 3 0 8 0 amappl1 80 233939 0 233291 33 18 15 18 0 8 1 amappl 88 167102 0 166818 8 0 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 72 132 0 2 3 0 3 3 0 8 0 uaddrrnd 24 13441 0 13405 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 13441 0 13405 1 0 1 1 0 8 0 vmmpekpl 168 94485 0 94436 3 0 3 3 0 8 0 vmmpepl 168 1211003 0 1208145 248 118 130 139 0 357 2 vmsppl 368 13440 0 13405 4 0 4 4 0 8 0 rwobjpl 56 288881 0 281378 118 9 109 110 0 8 0 pdppl 4096 26889 0 26810 313 232 81 93 0 8 2 pvpl 32 6205280 0 6184887 551 373 178 259 0 265 0 pmappl 248 13440 0 13405 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1293 0 443 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 intr_handler(ffff800026091ca0,ffff800000077500) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 kd_curproc sys/dev/kcov.c:577 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 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 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x1f __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 trapsignal(ffff8000ffff42a8,b,6,2,200001c0) at trapsignal+0x58 sys/kern/kern_sig.c:811 upageflttrap(ffff800026092100,200001c0) at upageflttrap+0x154 sys/arch/amd64/amd64/trap.c:205 usertrap(ffff800026092100) at usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffcecd0, count: -15 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(fffffd806a7325f0,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806a7325f0,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd806a7325e0) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002e4018a0,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002e4018a0,ffff80002e4018d8,ffff80002e401900) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd806a7325d8,20000000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002e401a30,20000300) at kpageflttrap+0x209 kerntrap(ffff80002e401a30) 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,ffff80002e401ce0) at ifioctl_get+0x2dd soo_ioctl(fffffd806a7218f8,c0106924,ffff80002e401ce0,ffff8000295107f0) at soo_ioctl+0x26c sys_ioctl(ffff8000295107f0,ffff80002e401df8,ffff80002e401e50) at sys_ioctl+0x4a2 syscall(ffff80002e401ec0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e401ec0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8f87df4e7e0, count: -15