login: witness: lock order reversal: 1st 0xffffffff8290fe50 netlock (netlock) 2nd 0xfffffd807b73a5f0 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{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(fffffd807b73a5f0,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd807b73a5f0,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd807b73a5e0) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002e36c370,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002e36c370,ffff80002e36c3a8,ffff80002e36c3d0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd807b73a5d8,2000c000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002e36c500,2000cf00) at kpageflttrap+0x209 kerntrap(ffff80002e36c500) 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,ffff80002e36ca50) at ifioctl_get+0x2dd soo_ioctl(ffff80002e36c7b0,c0106924,ffff80002e36ca50,ffff8000fffecd30) at soo_ioctl+0x26c fifo_ioctl(ffff80002e36c898) at fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307 VOP_IOCTL(fffffd807b7a3af0,c0106924,ffff80002e36ca50,3,fffffd807f7d83c0,ffff8000fffecd30) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd80689d4ef8,c0106924,ffff80002e36ca50,ffff8000fffecd30) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000fffecd30,ffff80002e36cb68,ffff80002e36cbc0) at sys_ioctl+0x4a2 syscall(ffff80002e36cc30) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e36cc30) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdf4969fd0b0, count: -18 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff80002e36c060 rbx 0x3 rdx 0xffff800000bc1440 rcx 0 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffff80002e36bfd0 r9 0x8080808080808080 r10 0xe1f5680b4a4a24f9 r11 0x1f25cb81603ea7bd r12 0xffffffff82ab07a0 w_lodata+0x52e30 r13 0 r14 0xffffffff82aaa8c0 w_lodata+0x4cf50 r15 0xfffffd8002f62d80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e36c050 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=163229 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffed7b0,0xffff8000fffed520 process=0xffff8000fffe9d38 user=0xffff80002e367000, vmspace=0xfffffd807b73a5d8 estcpu=1, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 43292 379894 30581 32767 2 0x10 syz-executor.7 15239 480008 13337 32767 2 0x10 syz-executor.6 75027 68055 27974 32767 7 0x10 syz-executor.1 *75027 163229 27974 32767 7 0x4000010 syz-executor.1 18954 486163 64759 32767 3 0x90 nanoslp syz-executor.4 18954 392796 64759 32767 3 0x4000090 kqpoll syz-executor.4 18954 485261 64759 32767 3 0x4000090 fsleep syz-executor.4 53316 488543 0 0 3 0x14200 bored sosplice 30581 83217 33429 32767 3 0x90 nanoslp syz-executor.7 88327 324257 3311 32767 2 0x10 syz-executor.5 64759 423268 81883 32767 3 0x90 nanoslp syz-executor.4 33429 18922 82470 0 3 0x82 wait syz-executor.7 13337 407165 35859 32767 3 0x90 nanoslp syz-executor.6 35859 251097 82470 0 3 0x82 wait syz-executor.6 3311 331590 82470 0 3 0x82 wait syz-executor.5 81883 154401 82470 0 3 0x82 wait syz-executor.4 12265 227331 39502 32767 3 0x90 nanoslp syz-executor.3 68625 520139 87033 32767 2 0x10 syz-executor.2 27974 396304 48566 32767 3 0x90 nanoslp syz-executor.1 39502 153932 82470 0 3 0x82 wait syz-executor.3 36263 79603 20116 32767 2 0x10 syz-executor.0 87033 506335 82470 0 3 0x82 wait syz-executor.2 48566 1897 82470 0 3 0x82 wait syz-executor.1 20116 33310 82470 0 3 0x82 wait syz-executor.0 82470 205560 28116 0 2 0x2 syz-fuzzer 82470 502312 28116 0 3 0x4000082 nanoslp syz-fuzzer 82470 183504 28116 0 3 0x4000082 thrsleep syz-fuzzer 82470 267217 28116 0 3 0x4000082 thrsleep syz-fuzzer 82470 198952 28116 0 3 0x4000082 nanoslp syz-fuzzer 82470 501246 28116 0 3 0x4000082 thrsleep syz-fuzzer 82470 80619 28116 0 3 0x4000082 thrsleep syz-fuzzer 82470 421214 28116 0 3 0x4000082 thrsleep syz-fuzzer 28116 243689 73952 0 3 0x10008a sigsusp ksh 73952 167552 19946 0 3 0x9a kqread sshd 31987 196957 1 0 3 0x100083 ttyin getty 19946 398294 1 0 3 0x88 kqread sshd 86475 428032 36937 73 3 0x1100090 kqread syslogd 36937 387372 1 0 3 0x100082 netio syslogd 4376 523786 1 0 3 0x100080 kqread resolvd 90775 166108 18314 77 3 0x100092 kqread dhcpleased 34638 237990 18314 77 3 0x100092 kqread dhcpleased 18314 328845 1 0 3 0x80 kqread dhcpleased 72367 186334 0 0 3 0x14200 bored smr 46973 199127 0 0 2 0x14200 zerothread 17772 34273 0 0 3 0x14200 aiodoned aiodoned 30066 337634 0 0 3 0x14200 syncer update 67109 341388 0 0 3 0x14200 cleaner cleaner 61000 444856 0 0 3 0x14200 reaper reaper 98875 359770 0 0 3 0x14200 pgdaemon pagedaemon 72538 347875 0 0 3 0x14200 bored viomb 5509 217900 0 0 3 0x40014200 acpi0 acpi0 44190 457066 0 0 3 0x40014200 idle1 24645 20459 0 0 3 0x14200 bored softnet 54609 181740 0 0 3 0x14200 bored systqmp 22091 20114 0 0 3 0x14200 bored systq 86506 88550 0 0 3 0x40014200 bored softclock 21881 446494 0 0 3 0x40014200 idle0 1 480697 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 75027 (syz-executor.1) thread 0xffff8000fffecd30 (163229) 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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10175 6407K 6419K 78643K 11265 0 pcb 13 8K 8K 78643K 13 0 rtable 238 6K 7K 78643K 348 0 ifaddr 81 16K 16K 78643K 82 0 sysctl 2 0K 0K 78643K 2 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 2K 78643K 33 0 iov 0 0K 8K 78643K 1 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1271 79K 79K 78643K 1288 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 10 0K 0K 78643K 10 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 22 81K 113K 78643K 344 0 proc 56 74K 99K 78643K 455 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 10 0 in_multi 99 6K 6K 78643K 105 0 ether_multi 1 0K 0K 78643K 2 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 624 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 285 81K 85K 78643K 5427 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 13 0 NDP 11 0K 2K 78643K 27 0 temp 88 4697K 4761K 78643K 4593 0 kqueue 12 18K 20K 78643K 40 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 35 0 32 1 0 1 1 0 8 0 rtentry 112 111 0 1 4 0 4 4 0 8 0 unpcb 136 103 0 88 1 0 1 1 0 8 0 syncache 296 6 0 6 3 2 1 1 0 8 1 tcpqe 32 338 0 338 1 1 0 1 0 8 0 tcpcb 736 62 0 58 2 0 2 2 0 8 1 arp 120 18 0 0 1 0 1 1 0 8 0 inpcb 304 137 0 130 1 0 1 1 0 8 0 nd6 48 24 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 256 452 0 0 29 0 29 29 0 8 0 art_table 32 453 0 0 4 0 4 4 0 8 0 art_node 16 110 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 3 1 0 1 1 0 8 1 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1703 0 273 90 0 90 90 0 8 0 ffsino 272 1703 0 273 96 0 96 96 0 8 0 nchpl 144 2177 0 513 62 0 62 62 0 8 0 uvmvnodes 80 1816 0 0 38 0 38 38 0 8 0 vnodes 224 1816 0 0 107 0 107 107 0 8 0 namei 1024 6814 0 6814 2 1 1 2 0 8 1 percpumem 16 40 0 0 1 0 1 1 0 8 0 scxspl 216 6824 0 6824 9 1 8 8 0 8 8 plimitpl 152 43 0 20 1 0 1 1 0 8 0 sigapl 424 621 0 571 7 0 7 7 0 8 0 futexpl 64 999 0 998 1 0 1 1 0 8 0 knotepl 120 102 0 0 4 0 4 4 0 8 0 kqueuepl 216 40 0 31 1 0 1 1 0 8 0 pipepl 336 148 0 120 3 0 3 3 0 8 0 fdescpl 496 606 0 573 7 2 5 6 0 8 0 filepl 152 2037 0 1800 11 0 11 11 0 8 1 lockfpl 104 20 0 18 1 0 1 1 0 8 0 lockfspl 48 11 0 9 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 96 178 0 160 1 0 1 1 0 8 0 zombiepl 144 573 0 571 1 0 1 1 0 8 0 processpl 1064 621 0 571 5 1 4 4 0 8 0 procpl 672 866 0 806 6 0 6 6 0 8 0 sosppl 168 2 0 2 2 1 1 1 0 8 1 sockpl 480 275 0 250 5 0 5 5 0 8 1 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 165 0 0 20 0 20 20 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 390 0 0 25 1 24 24 0 8 0 bufpl 288 3807 0 141 262 0 262 262 0 8 0 anonpl 24 114309 0 102418 80 3 77 77 0 186 1 amapchunkpl 152 12029 0 11340 32 2 30 31 0 158 0 amappl16 200 927 0 624 19 1 18 18 0 8 0 amappl15 192 115 0 108 1 0 1 1 0 8 0 amappl14 184 9 0 8 1 0 1 1 0 8 0 amappl13 176 114 0 108 1 0 1 1 0 8 0 amappl12 168 17 0 15 2 1 1 1 0 8 0 amappl11 160 51 0 39 1 0 1 1 0 8 0 amappl10 152 63 0 59 1 0 1 1 0 8 0 amappl9 144 566 0 555 1 0 1 1 0 8 0 amappl8 136 591 0 546 2 0 2 2 0 8 0 amappl7 128 153 0 142 1 0 1 1 0 8 0 amappl6 120 335 0 304 2 0 2 2 0 8 0 amappl5 112 470 0 449 1 0 1 1 0 8 0 amappl4 104 781 0 757 2 1 1 2 0 8 0 amappl3 96 201 0 187 1 0 1 1 0 8 0 amappl2 88 521 0 472 3 1 2 3 0 8 0 amappl1 80 13479 0 12883 18 4 14 18 0 8 0 amappl 88 5014 0 4788 6 0 6 6 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 606 0 573 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 606 0 573 1 0 1 1 0 8 0 vmmpekpl 168 8949 0 8906 3 0 3 3 0 8 0 vmmpepl 168 57396 0 55043 122 5 117 122 0 357 8 vmsppl 368 605 0 573 4 0 4 4 0 8 0 rwobjpl 56 16033 0 13025 43 0 43 43 0 8 0 pdppl 4096 1219 0 1146 105 24 81 89 0 8 8 pvpl 32 332145 0 315205 260 12 248 260 0 265 105 pmappl 248 605 0 573 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 649 0 28 18 0 18 18 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+0x12e __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x12e sys/kern/kern_lock.c:147 intr_handler(ffff80002e371e00,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 __sanitizer_cov_trace_const_cmp4(0,0) at __sanitizer_cov_trace_const_cmp4+0x10 sys/dev/kcov.c:224 witness_warn(2,0,ffffffff826062f3) at witness_warn+0x56a sys/kern/subr_witness.c:1469 userret(ffff8000fffed7b0) at userret+0x269 sys/kern/kern_sig.c:1988 syscall(ffff80002e372240) at syscall+0x57e mi_syscall_return sys/sys/syscall_mi.h:129 [inline] syscall(ffff80002e372240) at syscall+0x57e sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd56b0, count: -14 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(fffffd807b73a5f0,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd807b73a5f0,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd807b73a5e0) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002e36c370,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002e36c370,ffff80002e36c3a8,ffff80002e36c3d0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd807b73a5d8,2000c000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002e36c500,2000cf00) at kpageflttrap+0x209 kerntrap(ffff80002e36c500) 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,ffff80002e36ca50) at ifioctl_get+0x2dd soo_ioctl(ffff80002e36c7b0,c0106924,ffff80002e36ca50,ffff8000fffecd30) at soo_ioctl+0x26c fifo_ioctl(ffff80002e36c898) at fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307 VOP_IOCTL(fffffd807b7a3af0,c0106924,ffff80002e36ca50,3,fffffd807f7d83c0,ffff8000fffecd30) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd80689d4ef8,c0106924,ffff80002e36ca50,ffff8000fffecd30) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000fffecd30,ffff80002e36cb68,ffff80002e36cbc0) at sys_ioctl+0x4a2 syscall(ffff80002e36cc30) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e36cc30) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdf4969fd0b0, count: -18