witness: lock order reversal: 1st 0xfffffd807effea28 vmmaplk (&map->lock) 2nd 0xfffffd806da530a8 inode (&ip->i_lock) lock order "&ip->i_lock"(rrwlock) -> "&map->lock"(rwlock) first seen at: #0 witness_checkorder+0x65e witness_lock_order_add sys/kern/subr_witness.c:2463 [inline] #0 witness_checkorder+0x65e sys/kern/subr_witness.c:880 #1 rw_enter_read+0x66 sys/kern/kern_rwlock.c:111 #2 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1438 #3 uvm_fault+0x7e sys/uvm/uvm_fault.c:526 #4 pageflttrap+0x254 sys/arch/amd64/amd64/trap.c:219 #5 kerntrap+0xf1 sys/arch/amd64/amd64/trap.c:301 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x53 #8 ffs_read+0x3e2 sys/ufs/ffs/ffs_vnops.c:258 #9 VOP_READ+0xbf sys/kern/vfs_vops.c:247 #10 vn_rdwr+0x10b #11 vmcmd_map_readvn+0xda sys/kern/exec_subr.c:246 #12 exec_process_vmcmds+0xb2 sys/kern/exec_subr.c:143 #13 sys_execve+0x9ff sys/kern/kern_exec.c:461 #14 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #14 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 #15 Xsyscall+0x128 lock order "&map->lock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at: #0 witness_checkorder+0x65e witness_lock_order_add sys/kern/subr_witness.c:2463 [inline] #0 witness_checkorder+0x65e sys/kern/subr_witness.c:880 #1 rw_enter+0xd4 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 #4 vn_lock+0x6c sys/kern/vfs_vnops.c:575 #5 uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 #6 uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 #7 uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 #8 uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 #9 uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 #10 sys_mlockall+0x6a sys/uvm/uvm_mmap.c:828 #11 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #11 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 #12 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:398 witness_checkorder(fffffd806da530a8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd806da530a8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd806da53098,81) at rw_enter+0xd4 rrw_enter(fffffd806da53098,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd806da4dec0,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 vn_lock(fffffd806da4dec0,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd806dd27b48,ffff8000226d3938,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd806dd27b48,b000,ffff8000226d3b90,ffff8000226d3b2c,0,3) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807effea10,1b2e42b000,2,3) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807effea10,1b2e420000,1b2f420000,3) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807effea10,fffffd806c81d2b0,0,373,ffffffff8228a410,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlockall(ffff8000226fea00,ffff8000226d3d68,ffff8000226d3db0) at sys_mlockall+0x6a sys/uvm/uvm_mmap.c:828 syscall(ffff8000226d3e30) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000226d3e30) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x12c4958b280, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff8000226d3590 rbx 0x3 rdx 0xffff800000abd340 rcx 0x3 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffffffff8129a523 witness_checkorder+0xf33 r9 0x5 r10 0x2836351025b0916d r11 0xcf6273470bf631a3 r12 0xffffffff8281da90 w_lodata+0x54590 r13 0 r14 0xffffffff828089b0 w_lodata+0x3f4b0 r15 0xfffffd8002c8f480 rip 0xffffffff819aafe8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000226d3580 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=268725 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000226fec78,0xffffffff8287f558 process=0xffff8000226f0400 user=0xffff8000226ce000, vmspace=0xfffffd807effea10 estcpu=36, cpticks=6, pctcpu=0.0 user=0, sys=6, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 38171 143881 90920 0 2 0 syz-executor.0 *38171 268725 90920 0 7 0x4000000 syz-executor.0 90920 239117 68454 0 2 0x482 syz-executor.0 75096 8767 68454 0 2 0x2 syz-executor.1 6668 75921 1 0 3 0x100083 ttyin getty 620 351871 0 0 3 0x14200 bored sosplice 68454 130196 55218 0 7 0x482 syz-fuzzer 68454 261191 55218 0 2 0x4000482 syz-fuzzer 68454 461894 55218 0 3 0x4000082 kqread syz-fuzzer 68454 358588 55218 0 3 0x4000082 thrsleep syz-fuzzer 68454 318465 55218 0 3 0x4000082 thrsleep syz-fuzzer 68454 188171 55218 0 3 0x4000082 thrsleep syz-fuzzer 68454 283547 55218 0 3 0x4000082 thrsleep syz-fuzzer 68454 43511 55218 0 3 0x4000082 thrsleep syz-fuzzer 55218 204054 94948 0 3 0x10008a pause ksh 94948 467307 36152 0 3 0x92 select sshd 36152 352031 1 0 3 0x80 select sshd 9703 392596 48514 74 3 0x100092 bpf pflogd 48514 521514 1 0 3 0x80 netio pflogd 52295 87267 63811 73 3 0x100090 kqread syslogd 63811 352653 1 0 3 0x100082 netio syslogd 53868 226937 1 77 3 0x100090 poll dhclient 34306 54480 1 0 3 0x80 poll dhclient 89101 241580 0 0 3 0x14200 bored smr 17442 459849 0 0 2 0x14200 zerothread 70875 252933 0 0 3 0x14200 aiodoned aiodoned 57965 93086 0 0 3 0x14200 syncer update 84087 142674 0 0 3 0x14200 cleaner cleaner 83124 389179 0 0 3 0x14200 reaper reaper 4403 153097 0 0 3 0x14200 pgdaemon pagedaemon 5808 92021 0 0 3 0x14200 bored crynlk 42387 65187 0 0 3 0x14200 bored crypto 74861 130475 0 0 3 0x40014200 acpi0 acpi0 46685 422072 0 0 3 0x40014200 idle1 1447 198865 0 0 3 0x14200 bored softnet 82194 514447 0 0 3 0x14200 bored systqmp 46611 344109 0 0 3 0x14200 bored systq 87028 394394 0 0 3 0x40014200 bored softclock 98522 101028 0 0 3 0x40014200 idle0 1 429090 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 38171 (syz-executor.0) thread 0xffff8000226fea00 (268725) shared rwlock vmmaplk r = 0 (0xfffffd807effea28) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164 #1 rw_enter+0x446 sys/kern/kern_rwlock.c:311 #2 vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5452 #3 uvm_map_pageable_all+0x56 sys/uvm/uvm_map.c:2576 #4 sys_mlockall+0x6a sys/uvm/uvm_mmap.c:828 #5 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8287d770) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164 #1 syscall+0x3fd mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x3fd sys/arch/amd64/amd64/trap.c:567 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9535 6432K 6947K 78643K 14613 0 pcb 13 8K 8K 78643K 158 0 rtable 110 11K 12K 78643K 925 0 ifaddr 80 15K 16K 78643K 245 0 sysctl 2 0K 0K 78643K 2 0 counters 43 33K 34K 78643K 99 0 ioctlops 0 0K 4K 78643K 1772 0 iov 0 0K 24K 78643K 851 0 mount 1 1K 1K 78643K 1 0 vnodes 1220 77K 77K 78643K 2974 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 23 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 317 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 5 13K 25K 78643K 26571 0 sigio 0 0K 0K 78643K 27 0 proc 65 63K 95K 78643K 1098 0 subproc 32 2K 2K 78643K 221 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 212 0 in_multi 33 2K 2K 78643K 266 0 ether_multi 1 0K 0K 78643K 24 0 mrt 0 0K 0K 78643K 1 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 736 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 357 104K 104K 78643K 54737 0 UVM aobj 40 2K 2K 78643K 45 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 95 0 NDP 14 0K 0K 78643K 72 0 temp 144 3976K 4612K 78643K 77058 0 kqueue 3 4K 17K 78643K 2065 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 arp 64 31 0 25 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 96 180 0 178 1 0 1 1 0 8 0 rtentry 112 178 0 134 2 0 2 2 0 8 0 unpcb 120 4702 0 4619 3 0 3 3 0 8 0 syncache 272 23 0 23 10 9 1 1 0 8 1 tcpqe 32 312 0 312 8 8 0 1 0 8 0 tcpcb 592 419 0 415 7 6 1 3 0 8 0 inpcb 296 2326 0 2319 11 10 1 2 0 8 0 nd6 48 44 0 38 1 0 1 1 0 8 0 pkpcb 40 14 0 14 6 6 0 1 0 8 0 kcovpl 48 13 0 11 1 0 1 1 0 8 0 swfcl 56 1 0 0 1 0 1 1 0 8 0 ppxss 1128 1 0 1 1 1 0 1 0 8 0 pfstscr 40 5 0 5 2 2 0 1 0 8 0 pffrag 232 2 0 2 1 1 0 1 0 482 0 pffrnode 88 2 0 2 1 1 0 1 0 8 0 pffrent 40 54 0 54 3 3 0 1 0 8 0 pfosfp 40 849 0 423 5 0 5 5 0 8 0 pfosfpen 112 1433 0 714 21 0 21 21 0 8 0 pfstitem 24 63 0 61 1 0 1 1 0 8 0 pfstkey 112 70 0 68 1 0 1 1 0 8 0 pfstate 328 66 0 64 4 3 1 3 0 8 0 pfrule 1360 24 0 18 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 715 0 524 14 2 12 14 0 8 0 art_table 32 716 0 524 2 0 2 2 0 8 0 art_node 16 177 0 137 1 0 1 1 0 8 0 sysvmsgpl 40 22 0 7 1 0 1 1 0 8 0 semapl 112 313 0 303 1 0 1 1 0 8 0 shmpl 112 42 0 5 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 29145 0 27742 91 3 88 89 0 8 0 ffsino 272 29145 0 27742 96 2 94 95 0 8 0 nchpl 144 59385 0 57798 60 0 60 60 0 8 0 uvmvnodes 72 28680 0 0 522 0 522 522 0 8 0 vnodes 208 28680 0 0 1510 0 1510 1510 0 8 0 namei 1024 125693 0 125693 2 1 1 1 0 8 1 percpumem 16 60 0 28 1 0 1 1 0 8 0 vcpupl 1984 6 0 0 1 0 1 1 0 8 0 vmpool 560 8 0 2 1 0 1 1 0 8 0 scsiplug 72 2 0 2 2 2 0 1 0 8 0 scxspl 192 171994 0 171994 13 11 2 7 0 8 2 plimitpl 152 167 0 158 1 0 1 1 0 8 0 sigapl 424 26758 0 26726 4 0 4 4 0 8 0 futexpl 56 113892 0 113892 3 2 1 1 0 8 1 knotepl 112 1544 0 1524 1 0 1 1 0 8 0 kqueuepl 152 25625 0 25623 1 0 1 1 0 8 0 pipepl 304 384 0 373 14 12 2 2 0 8 0 fdescpl 496 26740 0 26724 3 0 3 3 0 8 0 filepl 152 69375 0 69273 7 2 5 6 0 8 1 lockfpl 104 628 0 627 1 0 1 1 0 8 0 lockfspl 48 223 0 222 1 0 1 1 0 8 0 sessionpl 120 31 0 20 1 0 1 1 0 8 0 pgrppl 48 153 0 142 1 0 1 1 0 8 0 ucredpl 96 2087 0 2077 1 0 1 1 0 8 0 zombiepl 144 26726 0 26725 2 1 1 1 0 8 0 processpl 1008 26758 0 26725 6 1 5 5 0 8 0 procpl 632 51824 0 51783 5 1 4 4 0 8 0 sosppl 144 40 0 40 10 10 0 1 0 8 0 sockpl 400 7228 0 7136 22 12 10 11 0 8 0 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl12k 12288 33 0 0 3 1 2 2 0 8 0 mcl9k 9216 34 0 0 2 0 2 2 0 8 0 mcl8k 8192 18 0 0 3 0 3 3 0 8 0 mcl4k 4096 25 0 0 3 0 3 3 0 8 0 mcl2k2 2112 17 0 0 2 0 2 2 0 8 0 mcl2k 2048 432 0 0 36 10 26 36 0 8 0 mtagpl 96 67 0 0 2 0 2 2 0 8 0 mbufpl 256 742 0 0 27 1 26 26 0 8 0 bufpl 280 33033 0 26783 447 0 447 447 0 8 0 anonpl 16 1599586 0 1553860 260 66 194 206 0 124 0 amapchunkpl 152 84993 0 83462 101 42 59 59 0 158 0 amappl16 192 63690 0 61946 130 42 88 97 0 8 0 amappl15 184 7 0 6 1 0 1 1 0 8 0 amappl14 176 1055 0 1049 1 0 1 1 0 8 0 amappl13 168 5072 0 5067 1 0 1 1 0 8 0 amappl12 160 32 0 26 1 0 1 1 0 8 0 amappl11 152 109 0 89 1 0 1 1 0 8 0 amappl10 144 1421 0 1417 1 0 1 1 0 8 0 amappl9 136 17570 0 17570 2 2 0 1 0 8 0 amappl8 128 370 0 262 5 1 4 4 0 8 0 amappl7 120 17591 0 17581 1 0 1 1 0 8 0 amappl6 112 1518 0 1503 1 0 1 1 0 8 0 amappl5 104 23578 0 23561 1 0 1 1 0 8 0 amappl4 96 326 0 298 1 0 1 1 0 8 0 amappl3 88 9229 0 9216 1 0 1 1 0 8 0 amappl2 80 161072 0 161000 3 0 3 3 0 8 0 amappl1 72 666554 0 666057 35 25 10 19 0 8 0 amappl 80 52506 0 52278 5 0 5 5 0 84 0 dma4096 4096 1 0 1 1 1 0 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 64 44 0 5 1 0 1 1 0 8 0 uaddrrnd 24 26748 0 26726 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 26748 0 26726 1 0 1 1 0 8 0 vmmpekpl 168 93976 0 93937 2 0 2 2 0 8 0 vmmpepl 168 3178885 0 3175660 522 327 195 222 0 357 51 vmsppl 368 26747 0 26726 3 0 3 3 0 8 1 pdppl 4096 53503 0 53458 7 1 6 6 0 8 0 pvpl 32 7433462 0 7385334 561 153 408 439 0 265 0 pmappl 232 26747 0 26726 4 2 2 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 323 0 44 10 1 9 9 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:398 witness_checkorder(fffffd806da530a8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd806da530a8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd806da53098,81) at rw_enter+0xd4 rrw_enter(fffffd806da53098,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd806da4dec0,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 vn_lock(fffffd806da4dec0,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd806dd27b48,ffff8000226d3938,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd806dd27b48,b000,ffff8000226d3b90,ffff8000226d3b2c,0,3) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807effea10,1b2e42b000,2,3) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807effea10,1b2e420000,1b2f420000,3) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807effea10,fffffd806c81d2b0,0,373,ffffffff8228a410,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlockall(ffff8000226fea00,ffff8000226d3d68,ffff8000226d3db0) at sys_mlockall+0x6a sys/uvm/uvm_mmap.c:828 syscall(ffff8000226d3e30) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000226d3e30) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x12c4958b280, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020d80ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 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(ffffffff8287d568) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8287d568) at __mp_lock+0x122 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff8287d568,1) at __mp_acquire_count+0x4c sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x390 sys/kern/sched_bsd.c:435 sleep_finish(ffff800021270610,1) at sleep_finish+0x111 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800021270610,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800021270610,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(ffffffff82821500,120,ffffffff823b473b,2) at tsleep+0x1c2 sys/kern/kern_synch.c:155 sys_nanosleep(ffff8000ffffe778,ffff800021270740,ffff800021270790) at sys_nanosleep+0x1f5 sys/kern/kern_time.c:297 syscall(ffff800021270810) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021270810) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd35c8, count: -12