witness: lock order reversal: 1st 0xfffffd807effe188 vmmaplk (&map->lock) 2nd 0xfffffd806d9c82c8 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(fffffd806d9c82c8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd806d9c82c8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd806d9c82b8,81) at rw_enter+0xd4 rrw_enter(fffffd806d9c82b8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd806d970df0,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 vn_lock(fffffd806d970df0,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd806dd21d88,ffff80002431d538,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd806dd21d88,9000,ffff80002431d790,ffff80002431d72c,0,3) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807effe170,1b33a29000,2,3) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807effe170,1b33a20000,1b34a20000,3) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807effe170,fffffd80638988f8,0,38c,ffffffff8228a410,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlockall(ffff8000212d6020,ffff80002431d968,ffff80002431d9b0) at sys_mlockall+0x6a sys/uvm/uvm_mmap.c:828 syscall(ffff80002431da30) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002431da30) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xccf92e5f690, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff80002431d190 rbx 0x3 rdx 0xffff800000029440 rcx 0x3 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffffffff8129a523 witness_checkorder+0xf33 r9 0x5 r10 0xcf48d163b75ac6bc r11 0xc40d00a7507935b6 r12 0xffffffff8281d720 w_lodata+0x54220 r13 0 r14 0xffffffff8280b450 w_lodata+0x41f50 r15 0xfffffd8002c8f480 rip 0xffffffff819aafe8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002431d180 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=397234 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000212d6510,0xffffffff8287f558 process=0xffff8000212c4400 user=0xffff800024318000, vmspace=0xfffffd807effe170 estcpu=36, cpticks=7, pctcpu=0.0 user=0, sys=7, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 31966 62571 18814 0 2 0 syz-executor.0 *31966 397234 18814 0 7 0x4000000 syz-executor.0 95013 23066 0 0 3 0x14200 acct acct 29531 164100 87264 0 2 0x482 syz-executor.1 18814 503971 87264 0 7 0x482 syz-executor.0 87264 56198 42467 0 3 0x82 thrsleep syz-fuzzer 87264 99136 42467 0 3 0x4000082 thrsleep syz-fuzzer 87264 500418 42467 0 3 0x4000082 thrsleep syz-fuzzer 87264 266334 42467 0 3 0x4000082 thrsleep syz-fuzzer 87264 289748 42467 0 3 0x4000082 thrsleep syz-fuzzer 87264 18607 42467 0 3 0x4000082 thrsleep syz-fuzzer 87264 41622 42467 0 3 0x4000082 thrsleep syz-fuzzer 87264 73949 42467 0 3 0x4000082 kqread syz-fuzzer 42467 50374 65414 0 3 0x10008a pause ksh 65414 144215 48434 0 3 0x92 select sshd 44166 228329 1 0 3 0x100083 ttyin getty 48434 276299 1 0 3 0x80 select sshd 32561 278048 56839 74 3 0x100092 bpf pflogd 56839 165217 1 0 3 0x80 netio pflogd 67445 102511 43617 73 3 0x100090 kqread syslogd 43617 366378 1 0 3 0x100082 netio syslogd 14641 255455 1 77 3 0x100090 poll dhclient 74947 326344 1 0 3 0x80 poll dhclient 11086 53565 0 0 3 0x14200 bored smr 84373 497460 0 0 2 0x14200 zerothread 5045 116588 0 0 3 0x14200 aiodoned aiodoned 74270 349489 0 0 3 0x14200 syncer update 99255 513662 0 0 3 0x14200 cleaner cleaner 14454 308109 0 0 3 0x14200 reaper reaper 83373 519258 0 0 3 0x14200 pgdaemon pagedaemon 39214 152082 0 0 3 0x14200 bored crynlk 14679 479381 0 0 3 0x14200 bored crypto 36632 331216 0 0 3 0x40014200 acpi0 acpi0 48784 230935 0 0 3 0x40014200 idle1 9971 259800 0 0 3 0x14200 bored softnet 74790 291338 0 0 3 0x14200 bored systqmp 68955 509124 0 0 3 0x14200 bored systq 8996 64099 0 0 3 0x40014200 bored softclock 80062 396872 0 0 3 0x40014200 idle0 1 80117 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 31966 (syz-executor.0) thread 0xffff8000212d6020 (397234) shared rwlock vmmaplk r = 0 (0xfffffd807effe188) #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 9470 6399K 6526K 78643K 10676 0 pcb 13 8K 8K 78643K 31 0 rtable 105 3K 3K 78643K 201 0 ifaddr 44 10K 10K 78643K 45 0 counters 43 33K 33K 78643K 43 0 ioctlops 0 0K 4K 78643K 2460 0 iov 0 0K 2K 78643K 12 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 77K 78643K 1250 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 14 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 117 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 5 13K 25K 78643K 40354 0 sigio 0 0K 0K 78643K 2 0 proc 61 63K 83K 78643K 476 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 90 0 in_multi 33 2K 2K 78643K 42 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 362 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 276 47K 47K 78643K 81822 0 UVM aobj 24 2K 2K 78643K 33 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 10 0 NDP 6 0K 0K 78643K 10 0 temp 99 3960K 4024K 78643K 82927 0 kqueue 3 4K 8K 78643K 5 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 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 96 31 0 29 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 505 0 495 1 0 1 1 0 8 0 syncache 272 4 0 4 1 1 0 1 0 8 0 tcpqe 32 487 0 487 3 3 0 2 0 8 0 tcpcb 592 193 0 181 4 2 2 2 0 8 0 inpcb 296 361 0 354 1 0 1 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 kcovpl 48 2 0 0 1 0 1 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 16 0 13 1 0 1 1 0 8 0 pfstkey 112 16 0 13 1 0 1 1 0 8 0 pfstate 328 16 0 13 1 0 1 1 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 188 0 0 12 0 12 12 0 8 0 art_table 32 189 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 29 0 7 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 111 0 101 1 0 1 1 0 8 0 shmpl 112 30 0 9 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 41845 0 40442 88 0 88 88 0 8 0 ffsino 272 41845 0 40442 95 1 94 94 0 8 0 nchpl 144 82721 0 81117 60 0 60 60 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 208 5926 0 0 312 0 312 312 0 8 0 namei 1024 167081 0 167081 3 2 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 192 248033 0 248033 10 8 2 7 0 8 2 plimitpl 152 28 0 19 1 0 1 1 0 8 0 sigapl 424 40570 0 40538 4 0 4 4 0 8 0 futexpl 56 146198 0 146198 1 0 1 1 0 8 1 knotepl 112 64 0 44 1 0 1 1 0 8 0 kqueuepl 152 36514 0 36508 1 0 1 1 0 8 0 pipepl 304 160 0 149 10 8 2 2 0 8 1 fdescpl 496 40554 0 40538 3 0 3 3 0 8 0 filepl 152 79579 0 79477 7 2 5 5 0 8 1 lockfpl 104 127 0 125 1 0 1 1 0 8 0 lockfspl 48 47 0 45 1 0 1 1 0 8 0 sessionpl 120 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 127 0 118 1 0 1 1 0 8 0 zombiepl 144 40538 0 40537 3 2 1 1 0 8 0 processpl 1008 40570 0 40537 6 1 5 5 0 8 0 procpl 632 80955 0 80914 5 1 4 4 0 8 0 sockpl 400 897 0 878 3 0 3 3 0 8 0 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 26 0 0 2 0 2 2 0 8 0 mcl9k 9216 18 0 0 2 0 2 2 0 8 0 mcl8k 8192 18 0 0 3 0 3 3 0 8 0 mcl4k 4096 27 0 0 3 0 3 3 0 8 0 mcl2k2 2112 17 0 0 2 0 2 2 0 8 0 mcl2k 2048 398 0 0 39 13 26 39 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 759 0 0 20 0 20 20 0 8 0 bufpl 280 44921 0 38671 447 0 447 447 0 8 0 anonpl 16 2353804 0 2311987 173 5 168 168 0 124 0 amapchunkpl 152 123634 0 122208 60 5 55 55 0 158 0 amappl16 192 96413 0 95176 69 3 66 66 0 8 4 amappl15 184 40331 0 40326 1 0 1 1 0 8 0 amappl14 176 26 0 20 1 0 1 1 0 8 0 amappl13 168 26 0 25 1 0 1 1 0 8 0 amappl12 160 13 0 9 1 0 1 1 0 8 0 amappl11 152 58 0 43 1 0 1 1 0 8 0 amappl10 144 14 0 9 1 0 1 1 0 8 0 amappl9 136 349 0 347 2 1 1 1 0 8 0 amappl8 128 189 0 127 3 0 3 3 0 8 0 amappl7 120 244 0 236 1 0 1 1 0 8 0 amappl6 112 65 0 56 1 0 1 1 0 8 0 amappl5 104 40737 0 40716 1 0 1 1 0 8 0 amappl4 96 282 0 257 1 0 1 1 0 8 0 amappl3 88 2787 0 2778 1 0 1 1 0 8 0 amappl2 80 275020 0 274952 3 0 3 3 0 8 0 amappl1 72 1123660 0 1123175 26 16 10 19 0 8 0 amappl 80 81362 0 81170 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 32 0 9 1 0 1 1 0 8 0 uaddrrnd 24 40554 0 40538 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 40554 0 40538 1 0 1 1 0 8 0 vmmpekpl 168 155764 0 155733 2 0 2 2 0 8 0 vmmpepl 168 4916780 0 4914168 204 81 123 158 0 357 4 vmsppl 368 40553 0 40538 2 0 2 2 0 8 0 pdppl 4096 81115 0 81076 7 1 6 6 0 8 0 pvpl 32 14482891 0 14437899 387 24 363 363 0 265 0 pmappl 232 40553 0 40538 2 1 1 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 285 0 21 8 0 8 8 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(fffffd806d9c82c8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd806d9c82c8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd806d9c82b8,81) at rw_enter+0xd4 rrw_enter(fffffd806d9c82b8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd806d970df0,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 vn_lock(fffffd806d970df0,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd806dd21d88,ffff80002431d538,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd806dd21d88,9000,ffff80002431d790,ffff80002431d72c,0,3) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807effe170,1b33a29000,2,3) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807effe170,1b33a20000,1b34a20000,3) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807effe170,fffffd80638988f8,0,38c,ffffffff8228a410,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlockall(ffff8000212d6020,ffff80002431d968,ffff80002431d9b0) at sys_mlockall+0x6a sys/uvm/uvm_mmap.c:828 syscall(ffff80002431da30) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002431da30) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xccf92e5f690, 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x7 sys/dev/kcov.c:139 __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(ffff8000212dd040,1) at sleep_finish+0x111 sys/kern/kern_synch.c:418 sleep_finish_all(ffff8000212dd040,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff8000212dd040,1) 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(ffff8000211e6c60,ffff8000212dd170,ffff8000212dd1c0) at sys_nanosleep+0x1f5 sys/kern/kern_time.c:297 syscall(ffff8000212dd240) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212dd240) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd6370, count: -12