login: witness: lock order reversal: 1st 0xfffffd8067e05d20 vmmaplk (&map->lock) 2nd 0xfffffd806726d258 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(fffffd806726d258,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806726d258,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd806726d248) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff800000c0f400,fffffd8068fa03a0,fffffd806726d200,0,0,ffff80002950dd38,7988ea9f9a622f73,fb,0) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff80002cd40e58,4,20000080,ffff80002cd40e88,ffff80002952e010) at sysctl_file+0x62d sys/kern/kern_sysctl.c:1457 kern_sysctl(ffff80002cd40e54,5,20000080,ffff80002cd40e88,0,0,c7aea30a1f51b5ab) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff80002952e010,ffff80002cd40ef8,ffff80002cd40f50) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff80002cd40fc0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002cd40fc0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x56dd5011860, count: -9 ddb{0}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff80002cd407c0 rbx 0x3 rdx 0xffff800000bed480 rcx 0 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffff80002cd40730 r9 0x8080808080808080 r10 0x22ffb92a1c01c289 r11 0x7433d6c4217fcb36 r12 0xffffffff82aacf40 w_lodata+0x4f5d0 r13 0 r14 0xffffffff82aa9420 w_lodata+0x4bab0 r15 0xfffffd8002f62c80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002cd407b0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.5) pid=332533 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=73, nice=20 forw=0xffffffffffffffff, list=0xffff80002952f7b0,0xffffffff82b3d400 process=0xffff80002950d0c0 user=0xffff80002cd3c000, vmspace=0xfffffd8067e05d08 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 60689 434179 69063 32767 2 0x10 syz-executor.5 *60689 332533 69063 32767 7 0x4000010 syz-executor.5 42638 485878 14579 32767 2 0x10 syz-executor.2 1543 198503 42295 32767 2 0x10 syz-executor.0 1543 446270 42295 32767 2 0x4000010 syz-executor.0 31129 472971 74395 32767 7 0x10 syz-executor.7 34939 263879 39809 32767 2 0x10 syz-executor.6 34939 156803 39809 32767 2 0x4000010 syz-executor.6 69484 363281 47976 32767 2 0x10 syz-executor.1 74395 143410 12624 32767 3 0x90 nanoslp syz-executor.7 69063 241118 32925 32767 3 0x90 nanoslp syz-executor.5 39809 4821 88546 32767 3 0x90 nanoslp syz-executor.6 12624 254268 38726 0 3 0x82 wait syz-executor.7 82686 130371 61195 32767 3 0x90 nanoslp syz-executor.4 88546 522870 38726 0 3 0x82 wait syz-executor.6 63537 92941 82233 32767 3 0x10 biowait syz-executor.3 32925 133494 38726 0 3 0x82 wait syz-executor.5 61195 172273 38726 0 3 0x82 wait syz-executor.4 82233 439168 38726 0 3 0x82 wait syz-executor.3 14579 107325 34803 32767 3 0x90 nanoslp syz-executor.2 47976 404906 88328 32767 2 0x10 syz-executor.1 34803 271231 38726 0 3 0x82 wait syz-executor.2 42295 261336 27199 32767 3 0x90 nanoslp syz-executor.0 88328 423776 38726 0 3 0x82 wait syz-executor.1 27199 243433 38726 0 3 0x82 wait syz-executor.0 38726 432018 84077 0 3 0x82 kqread syz-fuzzer 38726 312702 84077 0 3 0x4000082 nanoslp syz-fuzzer 38726 490806 84077 0 3 0x4000082 thrsleep syz-fuzzer 38726 520453 84077 0 3 0x4000082 thrsleep syz-fuzzer 38726 445821 84077 0 3 0x4000082 nanoslp syz-fuzzer 38726 255278 84077 0 3 0x4000082 thrsleep syz-fuzzer 38726 237697 84077 0 3 0x4000082 thrsleep syz-fuzzer 38726 175637 84077 0 3 0x4000082 thrsleep syz-fuzzer 84077 497844 65739 0 3 0x10008a sigsusp ksh 65739 513076 39955 0 3 0x9a kqread sshd 50185 221255 1 0 3 0x100083 ttyin getty 39955 293874 1 0 3 0x88 kqread sshd 30458 339111 10753 73 3 0x1100090 kqread syslogd 10753 473988 1 0 3 0x100082 netio syslogd 47868 80445 1 0 3 0x100080 kqread resolvd 3115 73488 73944 77 3 0x100092 kqread dhcpleased 52133 253999 73944 77 3 0x100092 kqread dhcpleased 73944 379220 1 0 3 0x80 kqread dhcpleased 99439 209092 0 0 3 0x14200 bored smr 20512 157209 0 0 2 0x14200 zerothread 55391 80987 0 0 3 0x14200 aiodoned aiodoned 80427 506161 0 0 3 0x14200 syncer update 72297 388787 0 0 3 0x14200 cleaner cleaner 15441 413096 0 0 3 0x14200 reaper reaper 94220 3653 0 0 3 0x14200 pgdaemon pagedaemon 86828 340260 0 0 3 0x14200 bored viomb 4412 342524 0 0 3 0x40014200 acpi0 acpi0 39201 213457 0 0 3 0x40014200 idle1 32257 363492 0 0 3 0x14200 bored softnet 15974 138684 0 0 3 0x14200 bored systqmp 59974 178965 0 0 3 0x14200 bored systq 23084 431323 0 0 3 0x40014200 bored softclock 43701 505133 0 0 3 0x40014200 idle0 1 250111 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 60689 (syz-executor.5) thread 0xffff80002952e010 (332533) shared rwlock vmmaplk r = 0 (0xfffffd8067e05d20) #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 Process 63537 (syz-executor.3) thread 0xffff8000fffefa48 (92941) exclusive rrwlock inode r = 0 (0xfffffd80750d54e8) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347 #6 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #8 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 #9 domkdirat+0x121 sys/kern/vfs_syscalls.c:3101 #10 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #10 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80690b6f78) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3086 #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10169 6406K 6419K 78643K 11259 0 pcb 13 8K 8K 78643K 13 0 rtable 238 6K 7K 78643K 352 0 ifaddr 81 16K 16K 78643K 82 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 2K 78643K 34 0 iov 0 0K 12K 78643K 7 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1271 79K 79K 78643K 1286 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 9 0 VM map 2 1K 1K 78643K 2 0 sem 3 0K 0K 78643K 3 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 24 89K 121K 78643K 830 0 sigio 0 0K 0K 78643K 36 0 proc 56 74K 111K 78643K 451 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 99 6K 6K 78643K 99 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 37 175K 175K 78643K 37 0 exec 0 0K 2K 78643K 653 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 282 79K 80K 78643K 11082 0 UVM aobj 14 2K 2K 78643K 15 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 11 0K 2K 78643K 27 0 temp 125 4704K 4767K 78643K 5689 0 kqueue 12 18K 20K 78643K 35 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 38 0 35 1 0 1 1 0 8 0 rtentry 112 111 0 1 4 0 4 4 0 8 0 unpcb 136 98 0 85 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpqe 32 43 0 43 1 1 0 1 0 8 0 tcpcb 736 12 0 7 1 0 1 1 0 8 0 arp 120 18 0 0 1 0 1 1 0 8 0 ipq 40 3 0 0 1 0 1 1 0 8 0 ipqe 40 5 0 2 1 0 1 1 0 8 0 inpcb 304 63 0 56 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 256 453 0 0 29 0 29 29 0 8 0 art_table 32 454 0 0 4 0 4 4 0 8 0 art_node 16 110 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 25 0 3 1 0 1 1 0 8 0 semapl 112 1 0 0 1 0 1 1 0 8 0 shmpl 112 12 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2177 0 748 90 0 90 90 0 8 0 ffsino 272 2177 0 748 96 0 96 96 0 8 0 nchpl 144 3143 0 1483 62 0 62 62 0 8 0 uvmvnodes 80 2290 0 0 47 0 47 47 0 8 0 vnodes 224 2290 0 0 135 0 135 135 0 8 0 namei 1024 8926 0 8925 2 1 1 2 0 8 0 percpumem 16 40 0 0 1 0 1 1 0 8 0 scxspl 216 9786 0 9785 10 7 3 8 0 8 2 plimitpl 152 34 0 12 1 0 1 1 0 8 0 sigapl 424 1109 0 1059 7 1 6 7 0 8 0 futexpl 64 1744 0 1744 1 0 1 1 0 8 1 knotepl 120 104 0 0 4 0 4 4 0 8 0 kqueuepl 216 57 0 49 1 0 1 1 0 8 0 pipepl 336 189 0 161 3 0 3 3 0 8 0 fdescpl 496 1095 0 1060 7 2 5 6 0 8 0 filepl 152 2679 0 2446 10 0 10 10 0 8 0 lockfpl 104 14 0 12 1 0 1 1 0 8 0 lockfspl 48 8 0 6 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 25 0 9 1 0 1 1 0 8 0 ucredpl 96 148 0 130 1 0 1 1 0 8 0 zombiepl 144 1060 0 1059 1 0 1 1 0 8 0 processpl 1064 1109 0 1059 5 1 4 4 0 8 0 procpl 672 1857 0 1797 7 0 7 7 0 8 1 sockpl 480 212 0 189 4 0 4 4 0 8 1 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 165 0 0 20 0 20 20 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 345 0 0 21 0 21 21 0 8 0 bufpl 288 4336 0 130 301 0 301 301 0 8 0 anonpl 24 233225 0 221496 79 0 79 79 0 186 2 amapchunkpl 152 25395 0 24703 33 1 32 32 0 158 3 amappl16 200 1691 0 1388 18 1 17 17 0 8 0 amappl15 192 240 0 234 1 0 1 1 0 8 0 amappl14 184 94 0 92 1 0 1 1 0 8 0 amappl13 176 193 0 188 1 0 1 1 0 8 0 amappl12 168 32 0 28 1 0 1 1 0 8 0 amappl11 160 57 0 45 1 0 1 1 0 8 0 amappl10 152 121 0 117 1 0 1 1 0 8 0 amappl9 144 638 0 630 1 0 1 1 0 8 0 amappl8 136 728 0 680 2 0 2 2 0 8 0 amappl7 128 308 0 295 1 0 1 1 0 8 0 amappl6 120 379 0 356 2 1 1 2 0 8 0 amappl5 112 795 0 773 1 0 1 1 0 8 0 amappl4 104 874 0 843 2 0 2 2 0 8 0 amappl3 96 287 0 272 1 0 1 1 0 8 0 amappl2 88 626 0 582 3 1 2 3 0 8 0 amappl1 80 21124 0 20509 18 3 15 18 0 8 0 amappl 88 10672 0 10445 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 14 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1095 0 1060 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1095 0 1060 1 0 1 1 0 8 0 vmmpekpl 168 10707 0 10658 3 0 3 3 0 8 0 vmmpepl 168 98330 0 95892 120 1 119 119 0 357 9 vmsppl 368 1094 0 1060 4 0 4 4 0 8 0 rwobjpl 56 24831 0 21340 50 0 50 50 0 8 0 pdppl 4096 2197 0 2120 117 36 81 93 0 8 4 pvpl 32 519539 0 502844 262 19 243 260 0 265 101 pmappl 248 1094 0 1060 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 694 0 39 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(fffffd806726d258,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806726d258,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd806726d248) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff800000c0f400,fffffd8068fa03a0,fffffd806726d200,0,0,ffff80002950dd38,7988ea9f9a622f73,fb,0) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff80002cd40e58,4,20000080,ffff80002cd40e88,ffff80002952e010) at sysctl_file+0x62d sys/kern/kern_sysctl.c:1457 kern_sysctl(ffff80002cd40e54,5,20000080,ffff80002cd40e88,0,0,c7aea30a1f51b5ab) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff80002952e010,ffff80002cd40ef8,ffff80002cd40f50) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff80002cd40fc0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002cd40fc0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x56dd5011860, 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(ffff80002606a840) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff80002606a840) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe36b0, count: -6