witness: lock order reversal: 1st 0xfffffd807efffd08 vmmaplk (&map->lock) 2nd 0xfffffd806badd4e8 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(fffffd806badd4e8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd806badd4e8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd806badd4d8,81) at rw_enter+0xd4 rrw_enter(fffffd806badd4d8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd806ba451c0,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 vn_lock(fffffd806ba451c0,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd80789a9758,ffff8000257061e8,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd80789a9758,f000,ffff800025706440,ffff8000257063dc,0,3) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807efffcf0,1b3312f000,2,3) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807efffcf0,1b33120000,1b34120000,3) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807efffcf0,fffffd806c95eaf0,0,387,ffffffff81071de0,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlockall(ffff8000ffffaee8,ffff800025706618,ffff800025706660) at sys_mlockall+0x6a sys/uvm/uvm_mmap.c:828 syscall(ffff8000257066e0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000257066e0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4865b596890, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff800025705e40 rbx 0x3 rdx 0xffff800000ae86c0 rcx 0x3 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffffffff817c2c03 witness_checkorder+0xf33 r9 0x5 r10 0x2e524734119706b2 r11 0x134cc9dbf8a28e76 r12 0xffffffff8286a100 w_lodata+0x546f0 r13 0 r14 0xffffffff82854cb0 w_lodata+0x3f2a0 r15 0xfffffd8002c8a480 rip 0xffffffff81878348 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800025705e30 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=113955 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffa9f8,0xffffffff82888be0 process=0xffff8000ffff97a8 user=0xffff800025701000, vmspace=0xfffffd807efffcf0 estcpu=36, cpticks=5, pctcpu=0.0 user=0, sys=5, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 11099 147043 4047 32767 2 0x10 syz-executor.0 *11099 113955 4047 32767 7 0x4000010 syz-executor.0 44349 357907 0 0 3 0x14200 bored sosplice 85911 302539 18000 32767 3 0x90 piperd syz-executor.1 4047 265548 94325 32767 7 0x490 syz-executor.0 18000 324338 54995 0 3 0x82 wait syz-executor.1 94325 59926 54995 0 3 0x82 wait syz-executor.0 54995 439962 98627 0 3 0x82 thrsleep syz-fuzzer 54995 316371 98627 0 2 0x4000482 syz-fuzzer 54995 170093 98627 0 3 0x4000082 thrsleep syz-fuzzer 54995 85406 98627 0 3 0x4000082 thrsleep syz-fuzzer 54995 195755 98627 0 3 0x4000082 thrsleep syz-fuzzer 54995 294554 98627 0 3 0x4000082 thrsleep syz-fuzzer 54995 340325 98627 0 3 0x4000082 kqread syz-fuzzer 54995 442544 98627 0 2 0x4000002 syz-fuzzer 98627 195619 53223 0 3 0x10008a pause ksh 53223 498762 61565 0 3 0x92 select sshd 13055 416113 1 0 3 0x100083 ttyin getty 61565 40450 1 0 3 0x80 select sshd 74249 73109 12374 73 3 0x100090 kqread syslogd 12374 482113 1 0 3 0x100082 netio syslogd 26612 258002 1 77 3 0x100090 poll dhclient 44640 365651 1 0 3 0x80 poll dhclient 70732 365411 0 0 3 0x14200 bored smr 82744 91182 0 0 2 0x14200 zerothread 21253 413050 0 0 3 0x14200 aiodoned aiodoned 88428 297374 0 0 3 0x14200 syncer update 65757 266552 0 0 3 0x14200 cleaner cleaner 45599 395860 0 0 3 0x14200 reaper reaper 21760 215330 0 0 3 0x14200 pgdaemon pagedaemon 69666 21083 0 0 3 0x14200 bored crynlk 36717 498149 0 0 3 0x14200 bored crypto 58034 239919 0 0 3 0x40014200 acpi0 acpi0 49134 315901 0 0 3 0x40014200 idle1 92085 515144 0 0 3 0x14200 bored softnet 9006 331321 0 0 3 0x14200 bored systqmp 49655 452532 0 0 3 0x14200 bored systq 455 113464 0 0 3 0x40014200 bored softclock 35341 415525 0 0 3 0x40014200 idle0 1 283259 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 11099 (syz-executor.0) thread 0xffff8000ffffaee8 (113955) shared rwlock vmmaplk r = 0 (0xfffffd807efffd08) #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 (0xffffffff82889918) #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 9465 6330K 6330K 78643K 10557 0 pcb 13 8K 8K 78643K 13 0 rtable 105 3K 3K 78643K 205 0 ifaddr 39 10K 10K 78643K 39 0 counters 43 33K 33K 78643K 43 0 ioctlops 0 0K 2K 78643K 260 0 iov 0 0K 24K 78643K 4352 0 mount 1 1K 1K 78643K 1 0 vnodes 1217 77K 77K 78643K 1256 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 310 0 VM map 2 1K 1K 78643K 2 0 sem 10 1K 1K 78643K 14 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 7 21K 33K 78643K 118195 0 sigio 0 0K 0K 78643K 63 0 proc 48 50K 83K 78643K 412 0 subproc 34 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 611 0 in_multi 33 2K 2K 78643K 59 0 ether_multi 1 0K 0K 78643K 8 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 43 201K 201K 78643K 43 0 exec 0 0K 2K 78643K 354 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 235 46K 52K 78643K 262184 0 UVM aobj 131 4K 4K 78643K 133 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 32 0 NDP 5 0K 0K 78643K 9 0 temp 102 3965K 4029K 78643K 241972 0 kqueue 3 4K 14K 78643K 3027 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 65 0 63 1 0 1 1 0 8 0 rtentry 112 46 0 2 2 0 2 2 0 8 0 unpcb 120 7797 0 7789 1 0 1 1 0 8 0 syncache 272 10 0 10 4 4 0 1 0 8 0 tcpqe 32 469 0 469 5 5 0 4 0 8 0 tcpcb 592 40262 0 40258 141 140 1 9 0 8 0 inpcb 296 60568 0 60561 40 39 1 2 0 8 0 nd6 48 7 0 1 1 0 1 1 0 8 0 kcovpl 48 2 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 200 0 11 13 1 12 13 0 8 0 art_table 32 201 0 11 2 0 2 2 0 8 0 art_node 16 45 0 5 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 3 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 shmpl 112 130 0 2 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 120384 0 118987 88 0 88 88 0 8 0 ffsino 272 120384 0 118987 94 0 94 94 0 8 0 nchpl 144 246617 0 245018 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 554012 0 554012 2 1 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 192 718969 0 718969 8 7 1 7 0 8 1 plimitpl 152 93 0 83 1 0 1 1 0 8 0 sigapl 424 118383 0 118351 4 0 4 4 0 8 0 futexpl 56 800810 0 800810 1 0 1 1 0 8 1 knotepl 112 2955 0 2935 1 0 1 1 0 8 0 kqueuepl 152 179031 0 178943 4 0 4 4 0 8 0 pipepl 304 3435 0 3424 40 39 1 2 0 8 0 fdescpl 496 118367 0 118351 3 0 3 3 0 8 0 filepl 152 445302 0 445203 56 52 4 5 0 8 0 lockfpl 104 261 0 259 1 0 1 1 0 8 0 lockfspl 48 88 0 86 1 0 1 1 0 8 0 sessionpl 120 17 0 7 1 0 1 1 0 8 0 pgrppl 48 42 0 32 1 0 1 1 0 8 0 ucredpl 96 2706 0 2697 1 0 1 1 0 8 0 zombiepl 144 118351 0 118351 2 1 1 1 0 8 1 processpl 1008 118383 0 118351 5 0 5 5 0 8 0 procpl 632 245001 0 244961 4 0 4 4 0 8 0 sosppl 144 457 0 457 5 5 0 1 0 8 0 sockpl 400 68701 0 68684 64 62 2 4 0 8 0 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 49 0 0 4 2 2 2 0 8 0 mcl9k 9216 34 0 0 2 0 2 2 0 8 0 mcl8k 8192 33 0 0 4 1 3 3 0 8 0 mcl4k 4096 33 0 0 3 0 3 3 0 8 0 mcl2k2 2112 17 0 0 2 0 2 2 0 8 0 mcl2k 2048 949 0 0 74 63 11 72 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 2160 0 0 37 3 34 37 0 8 0 bufpl 280 122221 0 115973 447 0 447 447 0 8 0 anonpl 16 7087754 0 7039668 200 6 194 194 0 124 0 amapchunkpl 152 373515 0 372586 41 5 36 36 0 158 0 amappl16 192 204802 0 202638 120 11 109 110 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 25 0 18 1 0 1 1 0 8 0 amappl13 168 40691 0 40689 1 0 1 1 0 8 0 amappl12 160 18 0 13 1 0 1 1 0 8 0 amappl11 152 51 0 41 1 0 1 1 0 8 0 amappl10 144 79384 0 79376 1 0 1 1 0 8 0 amappl9 136 362 0 362 1 1 0 1 0 8 0 amappl8 128 226 0 146 3 0 3 3 0 8 0 amappl7 120 217 0 209 1 0 1 1 0 8 0 amappl6 112 79430 0 79418 1 0 1 1 0 8 0 amappl5 104 79828 0 79810 1 0 1 1 0 8 0 amappl4 96 331 0 308 1 0 1 1 0 8 0 amappl3 88 83603 0 83590 1 0 1 1 0 8 0 amappl2 80 808989 0 808924 2 0 2 2 0 8 0 amappl1 72 3636130 0 3635647 26 16 10 18 0 8 0 amappl 80 245267 0 245131 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 64 132 0 2 3 0 3 3 0 8 0 uaddrrnd 24 118367 0 118351 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 118367 0 118351 1 0 1 1 0 8 0 vmmpekpl 168 401374 0 401346 2 0 2 2 0 8 0 vmmpepl 168 15264916 0 15261321 257 98 159 166 0 357 0 vmsppl 368 118366 0 118351 2 0 2 2 0 8 0 pdppl 4096 236741 0 236702 6 1 5 6 0 8 0 pvpl 32 31286903 0 31235610 498 84 414 414 0 265 0 pmappl 232 118366 0 118351 2 1 1 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 403 0 138 10 0 10 10 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(fffffd806badd4e8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd806badd4e8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd806badd4d8,81) at rw_enter+0xd4 rrw_enter(fffffd806badd4d8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd806ba451c0,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 vn_lock(fffffd806ba451c0,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd80789a9758,ffff8000257061e8,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd80789a9758,f000,ffff800025706440,ffff8000257063dc,0,3) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807efffcf0,1b3312f000,2,3) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807efffcf0,1b33120000,1b34120000,3) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807efffcf0,fffffd806c95eaf0,0,387,ffffffff81071de0,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlockall(ffff8000ffffaee8,ffff800025706618,ffff800025706660) at sys_mlockall+0x6a sys/uvm/uvm_mmap.c:828 syscall(ffff8000257066e0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000257066e0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4865b596890, 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(ffffffff82889710) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82889710) at __mp_lock+0x122 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff82889710,1) 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(ffff8000212e66d0,1) at sleep_finish+0x111 sys/kern/kern_synch.c:418 sleep_finish_all(ffff8000212e66d0,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff8000212e66d0,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(ffffffff82875498,120,ffffffff823b6ef2,2) at tsleep+0x1c2 sys/kern/kern_synch.c:155 sys_nanosleep(ffff8000fffffb38,ffff8000212e6800,ffff8000212e6850) at sys_nanosleep+0x1f5 sys/kern/kern_time.c:297 syscall(ffff8000212e68d0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212e68d0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc0770, count: -12