witness: lock order reversal: 1st 0xfffffd807effe2f8 vmmaplk (&map->lock) 2nd 0xfffffd806bab33d8 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+0x24f sys/arch/amd64/amd64/trap.c:219 #5 kerntrap+0xf1 sys/arch/amd64/amd64/trap.c:300 #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:253 #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:566 #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:614 #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:833 #11 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #11 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:566 #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(fffffd806bab33d8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd806bab33d8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd806bab33c8,81) at rw_enter+0xd4 rrw_enter(fffffd806bab33c8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd806ba1a360,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd806ba1a360,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd806ddbe8c0,ffff80002572be38,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd806ddbe8c0,10000,ffff80002572c090,ffff80002572c02c,0,3) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807effe2e0,1b31130000,2,3) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807effe2e0,1b31120000,1b32120000,3) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807effe2e0,fffffd8069484830,0,39b,ffffffff81ad9100,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlockall(ffff8000ffffa290,ffff80002572c268,ffff80002572c2b0) at sys_mlockall+0x6a sys/uvm/uvm_mmap.c:833 syscall(ffff80002572c330) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002572c330) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:566 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6841b0c2ec0, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff80002572ba90 rbx 0x3 rdx 0xffff800000af3780 rcx 0x3 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffffffff81e04f73 witness_checkorder+0xf33 r9 0x5 r10 0xb30bf47c9ddd354e r11 0xd1452d868e253dd3 r12 0xffffffff8286c470 w_lodata+0x54590 r13 0 r14 0xffffffff82855080 w_lodata+0x3d1a0 r15 0xfffffd8002c8b480 rip 0xffffffff812d2b38 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002572ba80 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=124245 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffb650,0xffffffff828923b8 process=0xffff8000ffff8fc8 user=0xffff800025727000, vmspace=0xfffffd807effe2e0 estcpu=36, cpticks=7, pctcpu=0.0 user=0, sys=7, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 84214 323081 17034 32767 2 0x10 syz-executor.1 *84214 124245 17034 32767 7 0x4000010 syz-executor.1 17034 373224 59605 32767 2 0x490 syz-executor.1 59605 433319 49978 0 3 0x82 wait syz-executor.1 85506 155212 86864 32767 2 0x490 syz-executor.0 86864 388339 49978 0 3 0x82 wait syz-executor.0 88924 84576 0 0 3 0x14200 bored sosplice 49978 390949 54454 0 3 0x82 thrsleep syz-fuzzer 49978 114719 54454 0 7 0x4000482 syz-fuzzer 49978 22762 54454 0 2 0x4000482 syz-fuzzer 49978 386709 54454 0 3 0x4000082 thrsleep syz-fuzzer 49978 178084 54454 0 3 0x4000082 thrsleep syz-fuzzer 49978 332593 54454 0 3 0x4000082 thrsleep syz-fuzzer 49978 325393 54454 0 3 0x4000082 thrsleep syz-fuzzer 49978 132389 54454 0 3 0x4000082 thrsleep syz-fuzzer 49978 50808 54454 0 3 0x4000082 kqread syz-fuzzer 54454 151513 26198 0 3 0x10008a pause ksh 26198 58608 67943 0 3 0x92 select sshd 38312 81370 1 0 3 0x100083 ttyin getty 67943 185269 1 0 3 0x80 select sshd 37590 317101 75120 73 3 0x100090 kqread syslogd 75120 140588 1 0 3 0x100082 netio syslogd 29460 163017 1 77 3 0x100090 poll dhclient 53807 7028 1 0 3 0x80 poll dhclient 18697 359770 0 0 3 0x14200 bored smr 17790 188677 0 0 2 0x14200 zerothread 55164 120382 0 0 3 0x14200 aiodoned aiodoned 11075 224483 0 0 3 0x14200 syncer update 99066 460271 0 0 3 0x14200 cleaner cleaner 83213 92716 0 0 3 0x14200 reaper reaper 98396 428887 0 0 3 0x14200 pgdaemon pagedaemon 12507 239341 0 0 3 0x14200 bored crynlk 90042 477154 0 0 3 0x14200 bored crypto 66070 333453 0 0 3 0x40014200 acpi0 acpi0 84638 246805 0 0 3 0x40014200 idle1 72411 220886 0 0 3 0x14200 bored softnet 3970 43443 0 0 3 0x14200 bored systqmp 12929 281807 0 0 3 0x14200 bored systq 15158 339025 0 0 2 0x40014200 softclock 53874 144696 0 0 3 0x40014200 idle0 1 237579 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 84214 (syz-executor.1) thread 0xffff8000ffffa290 (124245) shared rwlock vmmaplk r = 0 (0xfffffd807effe2f8) #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:833 #5 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:566 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8289ccc8) #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:566 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9468 6331K 6331K 78643K 10572 0 pcb 13 8K 8K 78643K 13 0 rtable 107 3K 3K 78643K 545 0 ifaddr 39 10K 10K 78643K 71 0 sysctl 3 1K 1K 78643K 3 0 counters 43 33K 33K 78643K 51 0 ioctlops 0 0K 2K 78643K 2545 0 iov 0 0K 24K 78643K 228 0 mount 1 1K 1K 78643K 1 0 vnodes 1217 77K 77K 78643K 1533 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 120 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 3287 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 7 21K 33K 78643K 45080 0 sigio 0 0K 0K 78643K 54 0 proc 48 50K 83K 78643K 873 0 subproc 34 2K 2K 78643K 102 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 823 0 in_multi 33 2K 2K 78643K 269 0 ether_multi 1 0K 0K 78643K 42 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 61 281K 281K 78643K 61 0 exec 0 0K 2K 78643K 695 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 277 42K 63K 78643K 99961 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 6590 0 NDP 5 0K 0K 78643K 21 0 temp 102 3965K 4029K 78643K 92747 0 kqueue 3 4K 14K 78643K 669 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 14 0 8 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 96 324 0 322 1 0 1 1 0 8 0 rtentry 112 92 0 47 2 0 2 2 0 8 0 unpcb 120 23625 0 23616 1 0 1 1 0 8 0 syncache 272 137 0 137 12 12 0 1 0 8 0 tcpqe 32 272 0 272 13 13 0 1 0 8 0 tcpcb 592 20861 0 20857 57 54 3 8 0 8 2 ipq 40 12 0 11 2 1 1 1 0 8 0 ipqe 40 497 0 496 2 1 1 1 0 8 0 inpcb 296 23003 0 22996 11 10 1 3 0 8 0 ip6q 72 1 0 1 1 1 0 1 0 8 0 ip6af 40 3 0 3 1 1 0 1 0 8 0 nd6 48 21 0 14 1 0 1 1 0 8 0 kcovpl 48 6 0 4 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 395 0 200 14 1 13 13 0 8 0 art_table 32 396 0 200 2 0 2 2 0 8 0 art_node 16 91 0 50 1 0 1 1 0 8 0 sysvmsgpl 40 78 0 43 1 0 1 1 0 8 0 semapl 112 3285 0 3275 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 47642 0 46245 88 0 88 88 0 8 0 ffsino 272 47642 0 46245 94 0 94 94 0 8 0 nchpl 144 100073 0 98484 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 209304 0 209304 2 1 1 1 0 8 1 percpumem 16 36 0 4 1 0 1 1 0 8 0 scxspl 192 284577 0 284577 13 12 1 7 0 8 1 plimitpl 152 521 0 511 1 0 1 1 0 8 0 sigapl 424 45256 0 45224 4 0 4 4 0 8 0 futexpl 56 304996 0 304996 2 1 1 1 0 8 1 knotepl 112 767 0 747 1 0 1 1 0 8 0 kqueuepl 152 57608 0 57580 3 1 2 2 0 8 0 pipepl 304 2060 0 2049 24 23 1 2 0 8 0 fdescpl 496 45240 0 45224 4 1 3 3 0 8 1 filepl 152 171960 0 171861 15 10 5 7 0 8 1 lockfpl 104 4527 0 4526 1 0 1 1 0 8 0 lockfspl 48 2051 0 2050 1 0 1 1 0 8 0 sessionpl 120 21 0 11 1 0 1 1 0 8 0 pgrppl 48 52 0 42 1 0 1 1 0 8 0 ucredpl 96 4827 0 4818 1 0 1 1 0 8 0 zombiepl 144 45224 0 45223 1 0 1 1 0 8 0 processpl 1008 45256 0 45223 5 0 5 5 0 8 0 procpl 632 93979 0 93937 6 2 4 5 0 8 0 sosppl 144 170 0 170 7 7 0 1 0 8 0 sockpl 400 47091 0 47073 19 16 3 6 0 8 0 mcl64k 65536 27 0 0 3 1 2 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 41 0 0 3 1 2 2 0 8 0 mcl9k 9216 18 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 15 0 0 1 0 1 1 0 8 0 mcl2k 2048 932 0 0 29 5 24 28 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1266 0 0 39 1 38 39 0 8 0 bufpl 280 52082 0 45834 447 0 447 447 0 8 0 anonpl 16 2869629 0 2847374 198 108 90 90 0 124 0 amapchunkpl 152 150772 0 150083 68 41 27 32 0 158 0 amappl16 192 82737 0 82035 144 108 36 48 0 8 0 amappl15 184 21683 0 21680 1 0 1 1 0 8 0 amappl14 176 889 0 885 1 0 1 1 0 8 0 amappl13 168 21776 0 21772 1 0 1 1 0 8 0 amappl12 160 38 0 34 1 0 1 1 0 8 0 amappl11 152 62 0 52 1 0 1 1 0 8 0 amappl10 144 9 0 5 1 0 1 1 0 8 0 amappl9 136 383 0 382 2 1 1 1 0 8 0 amappl8 128 2134 0 1961 6 0 6 6 0 8 0 amappl7 120 269 0 259 1 0 1 1 0 8 0 amappl6 112 84 0 72 1 0 1 1 0 8 0 amappl5 104 44646 0 44628 1 0 1 1 0 8 0 amappl4 96 1205 0 1179 1 0 1 1 0 8 0 amappl3 88 23230 0 23220 1 0 1 1 0 8 0 amappl2 80 315521 0 315454 2 0 2 2 0 8 0 amappl1 72 1407435 0 1406941 37 27 10 18 0 8 0 amappl 80 94419 0 94319 3 0 3 3 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 64 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 45240 0 45224 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 45240 0 45224 1 0 1 1 0 8 0 vmmpekpl 168 197474 0 197440 3 1 2 2 0 8 0 vmmpepl 168 5899512 0 5897274 212 107 105 111 0 357 2 vmsppl 368 45239 0 45224 2 0 2 2 0 8 0 pdppl 4096 90487 0 90448 7 1 6 6 0 8 1 pvpl 32 12190267 0 12164716 459 252 207 207 0 265 0 pmappl 232 45239 0 45224 2 1 1 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 325 0 41 9 0 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(fffffd806bab33d8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd806bab33d8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd806bab33c8,81) at rw_enter+0xd4 rrw_enter(fffffd806bab33c8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd806ba1a360,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd806ba1a360,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd806ddbe8c0,ffff80002572be38,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd806ddbe8c0,10000,ffff80002572c090,ffff80002572c02c,0,3) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807effe2e0,1b31130000,2,3) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807effe2e0,1b31120000,1b32120000,3) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807effe2e0,fffffd8069484830,0,39b,ffffffff81ad9100,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlockall(ffff8000ffffa290,ffff80002572c268,ffff80002572c2b0) at sys_mlockall+0x6a sys/uvm/uvm_mmap.c:833 syscall(ffff80002572c330) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002572c330) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:566 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6841b0c2ec0, 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(ffffffff8289cac0) at __mp_lock+0x120 __mp_lock_spin sys/kern/kern_lock.c:117 [inline] __mp_lock(ffffffff8289cac0) at __mp_lock+0x120 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff8289cac0,1) 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(ffff80002127c2e0,1) at sleep_finish+0x111 sys/kern/kern_synch.c:418 sleep_finish_all(ffff80002127c2e0,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff80002127c2e0,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(ffffffff827cca1c,120,ffffffff823b74d1,2) at tsleep+0x1c2 sys/kern/kern_synch.c:155 sys_nanosleep(ffff8000ffffe500,ffff80002127c410,ffff80002127c460) at sys_nanosleep+0x1f5 sys/kern/kern_time.c:297 syscall(ffff80002127c4e0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002127c4e0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:566 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc00004df20, count: -12