witness: lock order reversal: 1st 0xffffffff8290fe50 netlock (netlock) 2nd 0xfffffd807e6c58c8 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(fffffd807e6c58c8,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd807e6c58c8,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd807e6c58b8) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff800022c508a0,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff800022c508a0,ffff800022c508d8,ffff800022c50900) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd807e6c58b0,20000000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff800022c50a30,20000300) at kpageflttrap+0x209 kerntrap(ffff800022c50a30) 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,ffff800022c50ce0) at ifioctl_get+0x2dd soo_ioctl(fffffd8077c047d8,c0106924,ffff800022c50ce0,ffff80002e3bc2b0) at soo_ioctl+0x26c sys_ioctl(ffff80002e3bc2b0,ffff800022c50df8,ffff800022c50e50) at sys_ioctl+0x4a2 syscall(ffff800022c50ec0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800022c50ec0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x767c37f7450, count: -15 ddb{1}> show registers rdi 0x3 rsi 0xffffffff8294abb0 __sancov_gen_cov_switch_values.134 rbp 0xffff800022c50590 rbx 0x3 rdx 0 rcx 0 rax 0xffff80002e3bc2b0 r8 0xffff800022c50500 r9 0x8080808080808080 r10 0x3569328e9415868b r11 0xc656101f3d96a45c r12 0xffffffff82ab06f0 w_lodata+0x52d80 r13 0 r14 0xffffffff82aa0520 w_lodata+0x42bb0 r15 0xfffffd8002f62d80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022c50580 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.2) pid=469348 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002e3bda50,0xffff80002e3bc560 process=0xffff8000ffff14e0 user=0xffff800022c4b000, vmspace=0xfffffd807e6c58b0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 50271 64655 42071 32767 2 0x10 syz-executor.6 68656 238452 84659 32767 3 0x90 nanoslp syz-executor.5 68656 227501 84659 32767 3 0x4000090 fsleep syz-executor.5 68656 401870 84659 32767 3 0x4000090 fsleep syz-executor.5 68656 50948 84659 32767 3 0x4000090 fsleep syz-executor.5 33931 381718 20470 32767 2 0x10 syz-executor.0 33931 236489 20470 32767 3 0x4000090 fsleep syz-executor.0 33931 173440 20470 32767 3 0x4000090 fsleep syz-executor.0 78862 55512 54325 32767 2 0x10 syz-executor.4 78862 354276 54325 32767 3 0x4000090 fsleep syz-executor.4 9175 49284 70319 32767 2 0x10 syz-executor.2 * 9175 469348 70319 32767 7 0x4000010 syz-executor.2 95894 209033 94429 32767 7 0x10 syz-executor.3 95894 360384 94429 32767 3 0x4000090 kqread syz-executor.3 34380 373871 34161 32767 3 0x90 nanoslp syz-executor.7 34380 436760 34161 32767 3 0x4000090 ttyout syz-executor.7 34380 267779 34161 32767 3 0x4000090 fsleep syz-executor.7 34380 18476 34161 32767 3 0x4000090 fsleep syz-executor.7 59319 475647 21182 32767 3 0x90 nanoslp syz-executor.1 59319 319685 21182 32767 3 0x4000090 fsleep syz-executor.1 59319 232077 21182 32767 3 0x4000090 kqpoll syz-executor.1 54325 218037 78884 32767 3 0x90 nanoslp syz-executor.4 78884 370265 47067 0 3 0x82 wait syz-executor.4 94429 228320 72640 32767 3 0x90 nanoslp syz-executor.3 72640 148619 47067 0 3 0x82 wait syz-executor.3 34161 227542 72097 32767 3 0x90 nanoslp syz-executor.7 72097 192518 47067 0 3 0x82 wait syz-executor.7 70319 516547 94845 32767 3 0x90 nanoslp syz-executor.2 94845 301008 47067 0 3 0x82 wait syz-executor.2 84659 479331 7360 32767 3 0x90 nanoslp syz-executor.5 7360 461950 47067 0 3 0x82 wait syz-executor.5 40727 257728 0 0 3 0x14200 bored sosplice 42071 433446 95826 32767 3 0x90 nanoslp syz-executor.6 95826 197198 47067 0 3 0x82 wait syz-executor.6 21182 250968 96765 32767 3 0x90 nanoslp syz-executor.1 96765 102146 47067 0 3 0x82 wait syz-executor.1 20470 249730 79924 32767 3 0x90 nanoslp syz-executor.0 79924 244697 47067 0 3 0x82 wait syz-executor.0 47067 433515 72568 0 3 0x82 kqread syz-fuzzer 47067 148673 72568 0 3 0x4000082 nanoslp syz-fuzzer 47067 55434 72568 0 3 0x4000082 thrsleep syz-fuzzer 47067 453810 72568 0 3 0x4000082 thrsleep syz-fuzzer 47067 144416 72568 0 3 0x4000082 thrsleep syz-fuzzer 47067 459497 72568 0 3 0x4000082 thrsleep syz-fuzzer 47067 151683 72568 0 3 0x4000082 thrsleep syz-fuzzer 47067 510883 72568 0 3 0x4000082 thrsleep syz-fuzzer 47067 158625 72568 0 3 0x4000082 thrsleep syz-fuzzer 72568 136284 79962 0 3 0x10008a sigsusp ksh 79962 71891 4825 0 3 0x9a kqread sshd 67862 110134 1 0 3 0x100083 ttyin getty 4825 333816 1 0 3 0x88 kqread sshd 78651 308496 14129 73 3 0x1100090 kqread syslogd 14129 228971 1 0 3 0x100082 netio syslogd 6005 109122 1 0 3 0x100080 kqread resolvd 63262 42240 5494 77 3 0x100092 kqread dhcpleased 76663 496282 5494 77 3 0x100092 kqread dhcpleased 5494 29104 1 0 3 0x80 kqread dhcpleased 68797 441953 0 0 3 0x14200 bored smr 22124 73772 0 0 2 0x14200 zerothread 52960 425009 0 0 3 0x14200 aiodoned aiodoned 98629 42726 0 0 3 0x14200 syncer update 74458 115986 0 0 3 0x14200 cleaner cleaner 18162 356313 0 0 3 0x14200 reaper reaper 76902 29942 0 0 3 0x14200 pgdaemon pagedaemon 78254 343023 0 0 3 0x14200 bored viomb 36204 66268 0 0 3 0x40014200 acpi0 acpi0 30835 138980 0 0 3 0x40014200 idle1 68431 234933 0 0 3 0x14200 bored softnet 21633 235603 0 0 3 0x14200 bored systqmp 48792 289608 0 0 3 0x14200 bored systq 45563 227732 0 0 3 0x40014200 bored softclock 25250 234449 0 0 3 0x40014200 idle0 1 443462 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 9175 (syz-executor.2) thread 0xffff80002e3bc2b0 (469348) 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 11331 0 pcb 13 16K 20K 78643K 19 0 rtable 256 7K 8K 78643K 1640 0 ifaddr 81 17K 17K 78643K 195 0 sysctl 2 0K 0K 78643K 2 0 counters 56 35K 35K 78643K 88 0 ioctlops 0 0K 2K 78643K 165 0 iov 0 0K 24K 78643K 1643 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1271 79K 79K 78643K 3228 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 96 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 1975 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 26 97K 119K 78643K 11725 0 sigio 0 0K 0K 78643K 322 0 proc 56 74K 111K 78643K 1559 0 subproc 104 6K 6K 78643K 312 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1752 0 in_multi 99 6K 7K 78643K 434 0 ether_multi 1 0K 0K 78643K 47 0 mrt 3 0K 0K 78643K 4 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 2279 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 473 97K 112K 78643K 153130 0 UVM aobj 131 8K 8K 78643K 145 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 510 0 NDP 11 0K 2K 78643K 75 0 temp 125 4707K 4771K 78643K 31595 0 kqueue 15 22K 28K 78643K 1008 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 120 854 0 851 12 11 1 3 0 8 0 rtentry 112 319 0 200 4 0 4 4 0 8 0 unpcb 136 9691 0 9676 83 77 6 9 0 8 5 syncache 296 105 0 105 20 19 1 1 0 8 1 tcpqe 32 29 0 29 9 8 1 1 0 8 1 tcpcb 736 14479 0 14455 272 263 9 26 0 8 4 arp 120 51 0 33 1 0 1 1 0 8 0 ipq 40 11 0 11 7 7 0 1 0 8 0 ipqe 40 34 0 34 7 7 0 1 0 8 0 inpcb 304 19547 0 19522 167 163 4 17 0 8 1 rttmr 72 14 0 14 1 1 0 1 0 8 0 ip6q 72 84 0 84 5 5 0 1 0 8 0 ip6af 40 161 0 161 5 5 0 1 0 8 0 nd6 48 100 0 67 1 0 1 1 0 8 0 kcovpl 48 24 0 16 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1422 0 918 40 5 35 38 0 8 0 art_table 32 1423 0 918 5 0 5 5 0 8 0 art_node 16 318 0 209 1 0 1 1 0 8 0 sysvmsgpl 40 27 0 9 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 1970 0 1960 1 0 1 1 0 8 0 shmpl 112 142 0 14 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 16494 0 15039 92 0 92 92 0 8 0 ffsino 272 16494 0 15039 98 0 98 98 0 8 0 nchpl 144 32427 0 30801 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 108879 0 108879 5 4 1 2 0 8 1 percpumem 16 56 0 16 1 0 1 1 0 8 0 scxspl 216 101336 0 101336 38 35 3 8 0 8 3 plimitpl 152 1907 0 1884 5 4 1 2 0 8 0 sigapl 424 11969 0 11917 7 1 6 7 0 8 0 futexpl 64 109795 0 109786 8 7 1 1 0 8 0 knotepl 120 768 0 0 18 1 17 17 0 8 0 kqueuepl 216 4654 0 4640 76 73 3 8 0 8 2 pipepl 336 2831 0 2802 86 81 5 13 0 8 2 fdescpl 496 11954 0 11917 7 2 5 6 0 8 0 filepl 152 86791 0 86541 171 156 15 22 0 8 5 lockfpl 104 1259 0 1257 1 0 1 1 0 8 0 lockfspl 48 462 0 460 1 0 1 1 0 8 0 sessionpl 144 39 0 23 1 0 1 1 0 8 0 pgrppl 48 143 0 127 1 0 1 1 0 8 0 ucredpl 96 11248 0 11230 1 0 1 1 0 8 0 zombiepl 144 11917 0 11917 1 0 1 1 0 8 1 processpl 1064 11969 0 11917 5 1 4 4 0 8 0 procpl 672 35759 0 35686 30 23 7 8 0 8 0 sosppl 168 195 0 195 26 25 1 1 0 8 1 sockpl 480 30402 0 30357 553 540 13 33 0 8 7 mcl64k 65536 31 0 0 4 0 4 4 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 24 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 33 0 0 4 1 3 3 0 8 0 mcl4k 4096 17 0 0 3 1 2 3 0 8 0 mcl2k2 2112 11 0 0 1 0 1 1 0 8 0 mcl2k 2048 300 0 0 20 1 19 19 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1399 0 0 60 0 60 60 0 8 0 bufpl 288 22415 0 16080 453 0 453 453 0 8 0 anonpl 24 3574400 0 3559336 274 164 110 140 0 186 0 amapchunkpl 152 390099 0 389219 169 133 36 48 0 158 0 amappl16 200 39499 0 39114 234 204 30 45 0 8 8 amappl15 192 6647 0 6638 1 0 1 1 0 8 0 amappl14 184 3497 0 3488 1 0 1 1 0 8 0 amappl13 176 1820 0 1815 1 0 1 1 0 8 0 amappl12 168 1493 0 1487 1 0 1 1 0 8 0 amappl11 160 51 0 40 1 0 1 1 0 8 0 amappl10 152 1694 0 1689 1 0 1 1 0 8 0 amappl9 144 478 0 473 1 0 1 1 0 8 0 amappl8 136 1450 0 1291 6 0 6 6 0 8 0 amappl7 128 235 0 223 1 0 1 1 0 8 0 amappl6 120 270 0 245 2 1 1 2 0 8 0 amappl5 112 10307 0 10287 1 0 1 1 0 8 0 amappl4 104 5021 0 4984 3 1 2 2 0 8 0 amappl3 96 2599 0 2583 1 0 1 1 0 8 0 amappl2 88 3060 0 3009 3 1 2 3 0 8 0 amappl1 80 219894 0 219220 18 3 15 18 0 8 0 amappl 88 151943 0 151638 14 6 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 72 144 0 14 3 0 3 3 0 8 0 uaddrrnd 24 11954 0 11917 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 11954 0 11917 1 0 1 1 0 8 0 vmmpekpl 168 97986 0 97940 3 0 3 3 0 8 0 vmmpepl 168 1105807 0 1102890 288 152 136 146 0 357 7 vmsppl 368 11953 0 11917 4 0 4 4 0 8 0 rwobjpl 56 282027 0 274488 122 12 110 113 0 8 0 pdppl 4096 23915 0 23834 374 293 81 91 0 8 0 pvpl 32 5864811 0 5844073 538 347 191 259 0 265 2 pmappl 248 11953 0 11917 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1525 0 651 26 0 26 26 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 __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 intr_handler(ffff8000248acc40,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+0x40 sys/dev/kcov.c:154 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x1f end of kernel end trace frame: 0x7f7fffff15f0, count: -9 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(fffffd807e6c58c8,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd807e6c58c8,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd807e6c58b8) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff800022c508a0,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff800022c508a0,ffff800022c508d8,ffff800022c50900) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd807e6c58b0,20000000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff800022c50a30,20000300) at kpageflttrap+0x209 kerntrap(ffff800022c50a30) 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,ffff800022c50ce0) at ifioctl_get+0x2dd soo_ioctl(fffffd8077c047d8,c0106924,ffff800022c50ce0,ffff80002e3bc2b0) at soo_ioctl+0x26c sys_ioctl(ffff80002e3bc2b0,ffff800022c50df8,ffff800022c50e50) at sys_ioctl+0x4a2 syscall(ffff800022c50ec0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800022c50ec0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x767c37f7450, count: -15