login: witness: lock order reversal: 1st 0xfffffd80695d3d20 vmmaplk (&map->lock) 2nd 0xfffffd8069553638 fdlock (&newfdp->fd_fd.fd_lock) lock order "&newfdp->fd_fd.fd_lock"(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 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 lock order "&map->lock"(rwlock) -> "&newfdp->fd_fd.fd_lock"(rwlock) first seen at: #0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 #1 fill_file+0xad2 sys/kern/kern_sysctl.c:1304 #2 sysctl_file+0x62d sys/kern/kern_sysctl.c:1457 #3 kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 #4 sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 #5 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #6 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(fffffd8069553638,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8069553638,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd8069553628) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff800000c24400,fffffd806c7a8a30,fffffd80695535e0,0,0,ffff800026cef200,cc1324fb6d95b4fc,4a00,0) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff80002e3777f8,4,20000080,ffff80002e377828,ffff80002123cd28) at sysctl_file+0x62d sys/kern/kern_sysctl.c:1457 kern_sysctl(ffff80002e3777f4,5,20000080,ffff80002e377828,0,0,5d27a98736a77272) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff80002123cd28,ffff80002e377898,ffff80002e3778f0) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff80002e377960) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e377960) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fb52bee380, count: -9 ddb{0}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff80002e377160 rbx 0x3 rdx 0xffff800000bc1800 rcx 0 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffff80002e3770d0 r9 0x8080808080808080 r10 0x91d51d4f4247ffe3 r11 0xfe018e43a31a3c37 r12 0xffffffff82aad360 w_lodata+0x4f9f0 r13 0 r14 0xffffffff82aa9dc0 w_lodata+0x4c450 r15 0xfffffd8002f62c80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e377150 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=340009 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=72, nice=20 forw=0xffffffffffffffff, list=0xffff800026f01cf0,0xffff80002123da58 process=0xffff800026cec448 user=0xffff80002e372000, vmspace=0xfffffd80695d3d08 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 19369 82491 52482 32767 2 0x10 syz-executor.2 19369 192656 52482 32767 2 0x4000010 syz-executor.2 72943 116838 44836 32767 2 0x10 syz-executor.4 72943 170874 44836 32767 2 0x4000010 syz-executor.4 98997 303673 69535 32767 2 0x10 syz-executor.0 *98997 340009 69535 32767 7 0x4000010 syz-executor.0 76455 171814 30131 32767 2 0x10 syz-executor.5 76455 356965 30131 32767 2 0x4000010 syz-executor.5 41343 44513 24570 32767 2 0x10 syz-executor.7 41343 7448 24570 32767 3 0x4000090 fsleep syz-executor.7 17953 158681 37175 32767 2 0x10 syz-executor.3 17953 28474 37175 32767 2 0x4000010 syz-executor.3 99934 233873 42352 32767 2 0x10 syz-executor.6 99934 440241 42352 32767 2 0x4000010 syz-executor.6 80251 393223 85986 32767 2 0x10 syz-executor.1 80251 216199 85986 32767 3 0x4000090 fsleep syz-executor.1 80251 302654 85986 32767 3 0x4000090 fsleep syz-executor.1 30131 288192 69501 32767 3 0x90 nanoslp syz-executor.5 69501 31560 44490 0 3 0x82 wait syz-executor.5 16788 118675 0 0 3 0x14200 bored sosplice 24570 156731 10964 32767 3 0x90 nanoslp syz-executor.7 10964 60094 44490 0 3 0x82 wait syz-executor.7 44836 442883 44263 32767 3 0x90 nanoslp syz-executor.4 42352 403672 7934 32767 3 0x90 nanoslp syz-executor.6 37175 359733 49348 32767 3 0x90 nanoslp syz-executor.3 44263 197258 44490 0 3 0x82 wait syz-executor.4 7934 289476 44490 0 3 0x82 wait syz-executor.6 52482 253134 15987 32767 7 0x10 syz-executor.2 49348 21107 44490 0 3 0x82 wait syz-executor.3 69535 217405 37054 32767 3 0x90 nanoslp syz-executor.0 85986 408226 10714 32767 3 0x90 nanoslp syz-executor.1 15987 37089 44490 0 3 0x82 wait syz-executor.2 10714 358651 44490 0 3 0x82 wait syz-executor.1 37054 425409 44490 0 3 0x82 wait syz-executor.0 44490 381667 67127 0 3 0x82 thrsleep syz-fuzzer 44490 386651 67127 0 3 0x4000082 thrsleep syz-fuzzer 44490 391025 67127 0 3 0x4000082 thrsleep syz-fuzzer 44490 64962 67127 0 3 0x4000082 kqread syz-fuzzer 44490 359331 67127 0 3 0x4000082 thrsleep syz-fuzzer 44490 278310 67127 0 3 0x4000082 thrsleep syz-fuzzer 44490 306300 67127 0 3 0x4000082 thrsleep syz-fuzzer 44490 367970 67127 0 3 0x4000082 thrsleep syz-fuzzer 44490 257436 67127 0 3 0x4000082 thrsleep syz-fuzzer 67127 263549 75808 0 3 0x10008a sigsusp ksh 75808 434707 4736 0 3 0x9a kqread sshd 17196 316598 1 0 3 0x100083 ttyin getty 4736 3964 1 0 3 0x88 kqread sshd 23863 460895 10351 73 3 0x1100090 kqread syslogd 10351 346264 1 0 3 0x100082 netio syslogd 7981 9221 1 0 3 0x100080 kqread resolvd 39610 55152 98815 77 3 0x100092 kqread dhcpleased 20877 217434 98815 77 3 0x100092 kqread dhcpleased 98815 324154 1 0 3 0x80 kqread dhcpleased 55762 58526 0 0 3 0x14200 bored smr 8049 6292 0 0 2 0x14200 zerothread 42619 455039 0 0 3 0x14200 aiodoned aiodoned 94176 316306 0 0 3 0x14200 syncer update 41114 497532 0 0 3 0x14200 cleaner cleaner 32353 277531 0 0 3 0x14200 reaper reaper 29908 166688 0 0 3 0x14200 pgdaemon pagedaemon 42137 92652 0 0 3 0x14200 bored viomb 8813 218074 0 0 3 0x40014200 acpi0 acpi0 80096 69315 0 0 3 0x40014200 idle1 59260 74095 0 0 3 0x14200 bored softnet 23074 7082 0 0 3 0x14200 bored systqmp 67370 414798 0 0 3 0x14200 bored systq 4523 252013 0 0 3 0x40014200 bored softclock 24063 3955 0 0 3 0x40014200 idle0 1 489728 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 98997 (syz-executor.0) thread 0xffff80002123cd28 (340009) shared rwlock vmmaplk r = 0 (0xfffffd80695d3d20) #0 witness_lock+0x44d #1 uvm_vslock+0xc8 sys/uvm/uvm_glue.c:129 #2 sys_sysctl+0x2d8 sys/kern/kern_sysctl.c:240 #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 exclusive rwlock sysctllk r = 0 (0xffffffff82941f10) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 sys_sysctl+0x1b3 sys/kern/kern_sysctl.c:233 #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 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829de988) #0 witness_lock+0x44d #1 syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10173 6407K 6419K 78643K 11269 0 pcb 13 8K 8K 78643K 13 0 rtable 238 6K 7K 78643K 426 0 ifaddr 81 16K 16K 78643K 96 0 counters 56 35K 35K 78643K 60 0 ioctlops 0 0K 2K 78643K 35 0 iov 0 0K 12K 78643K 9 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1270 79K 79K 78643K 1320 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 12 0K 0K 78643K 29 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 26 97K 121K 78643K 627 0 sigio 0 0K 0K 78643K 14 0 proc 56 74K 99K 78643K 507 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 57 0 in_multi 99 6K 7K 78643K 155 0 ether_multi 1 0K 0K 78643K 11 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 2K 78643K 660 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 332 80K 80K 78643K 8631 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 27 0 NDP 11 0K 2K 78643K 33 0 temp 125 4704K 4767K 78643K 5275 0 kqueue 12 18K 22K 78643K 42 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 79 0 76 1 0 1 1 0 8 0 rtentry 112 133 0 23 4 0 4 4 0 8 0 unpcb 136 140 0 127 1 0 1 1 0 8 0 syncache 296 41 0 41 2 1 1 1 0 8 1 tcpqe 32 6 0 6 1 0 1 1 0 8 1 tcpcb 736 243 0 239 7 4 3 5 0 8 2 arp 120 22 0 4 1 0 1 1 0 8 0 inpcb 304 410 0 402 3 1 2 2 0 8 1 nd6 48 30 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 256 540 0 88 29 0 29 29 0 8 0 art_table 32 541 0 88 4 0 4 4 0 8 0 art_node 16 132 0 32 1 0 1 1 0 8 0 sysvmsgpl 40 61 0 31 1 0 1 1 0 8 0 semapl 112 27 0 17 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1991 0 561 90 0 90 90 0 8 0 ffsino 272 1991 0 561 96 0 96 96 0 8 0 nchpl 144 2761 0 1134 62 0 62 62 0 8 0 uvmvnodes 80 2130 0 0 44 0 44 44 0 8 0 vnodes 224 2130 0 0 126 0 126 126 0 8 0 namei 1024 8424 0 8424 2 1 1 2 0 8 1 percpumem 16 42 0 2 1 0 1 1 0 8 0 scxspl 216 8714 0 8714 6 5 1 5 0 8 1 plimitpl 152 54 0 32 1 0 1 1 0 8 0 sigapl 424 897 0 845 7 0 7 7 0 8 0 futexpl 64 3614 0 3611 1 0 1 1 0 8 0 knotepl 120 104 0 0 4 0 4 4 0 8 0 kqueuepl 216 82 0 74 1 0 1 1 0 8 0 pipepl 336 135 0 107 3 0 3 3 0 8 0 fdescpl 496 882 0 845 7 2 5 6 0 8 0 filepl 152 2921 0 2683 11 0 11 11 0 8 1 lockfpl 104 123 0 121 1 0 1 1 0 8 0 lockfspl 48 34 0 32 1 0 1 1 0 8 0 sessionpl 144 25 0 9 1 0 1 1 0 8 0 pgrppl 48 25 0 9 1 0 1 1 0 8 0 ucredpl 96 328 0 310 1 0 1 1 0 8 0 zombiepl 144 845 0 845 1 0 1 1 0 8 1 processpl 1064 897 0 845 5 1 4 4 0 8 0 procpl 672 1444 0 1375 8 1 7 7 0 8 1 sosppl 168 16 0 16 2 1 1 1 0 8 1 sockpl 480 629 0 605 7 1 6 6 0 8 2 mcl64k 65536 15 0 0 2 0 2 2 0 8 0 mcl16k 16384 9 0 0 2 0 2 2 0 8 0 mcl12k 12288 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 7 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 174 0 0 21 0 21 21 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 404 0 0 24 0 24 24 0 8 0 bufpl 288 4227 0 154 291 0 291 291 0 8 0 anonpl 24 181432 0 169578 75 3 72 72 0 186 0 amapchunkpl 152 19561 0 18734 37 4 33 33 0 158 1 amappl16 200 1303 0 1067 14 1 13 13 0 8 0 amappl15 192 169 0 162 1 0 1 1 0 8 0 amappl14 184 102 0 97 1 0 1 1 0 8 0 amappl13 176 92 0 91 1 0 1 1 0 8 0 amappl12 168 27 0 23 1 0 1 1 0 8 0 amappl11 160 41 0 31 1 0 1 1 0 8 0 amappl10 152 100 0 95 1 0 1 1 0 8 0 amappl9 144 720 0 706 1 0 1 1 0 8 0 amappl8 136 612 0 565 2 0 2 2 0 8 0 amappl7 128 155 0 140 1 0 1 1 0 8 0 amappl6 120 478 0 447 2 1 1 2 0 8 0 amappl5 112 711 0 682 1 0 1 1 0 8 0 amappl4 104 851 0 826 3 2 1 3 0 8 0 amappl3 96 209 0 198 1 0 1 1 0 8 0 amappl2 88 525 0 483 3 1 2 3 0 8 0 amappl1 80 18258 0 17609 18 4 14 18 0 8 0 amappl 88 8148 0 7874 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 882 0 845 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 882 0 845 1 0 1 1 0 8 0 vmmpekpl 168 10101 0 10050 3 0 3 3 0 8 0 vmmpepl 168 80793 0 78186 119 5 114 114 0 357 0 vmsppl 368 881 0 845 4 0 4 4 0 8 0 rwobjpl 56 21623 0 18309 47 0 47 47 0 8 0 pdppl 4096 1771 0 1690 121 40 81 93 0 8 0 pvpl 32 472210 0 454771 248 32 216 246 0 265 75 pmappl 248 881 0 845 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 701 0 47 19 0 19 19 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(fffffd8069553638,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8069553638,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd8069553628) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff800000c24400,fffffd806c7a8a30,fffffd80695535e0,0,0,ffff800026cef200,cc1324fb6d95b4fc,4a00,0) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff80002e3777f8,4,20000080,ffff80002e377828,ffff80002123cd28) at sysctl_file+0x62d sys/kern/kern_sysctl.c:1457 kern_sysctl(ffff80002e3777f4,5,20000080,ffff80002e377828,0,0,5d27a98736a77272) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff80002123cd28,ffff80002e377898,ffff80002e3778f0) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff80002e377960) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e377960) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fb52bee380, count: -9 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 syscall(ffff800026085b60) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff800026085b60) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbf230, count: -6