witness: lock order reversal: 1st 0xfffffd80672a5e98 vmmaplk (&map->lock) 2nd 0xfffffd807177d808 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 kpageflttrap+0x210 sys/arch/amd64/amd64/trap.c:268 #5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:323 #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:589 #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_mlock+0x180 sys/uvm/uvm_mmap.c:772 #11 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #11 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:589 #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(fffffd807177d808,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd807177d808,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd807177d7f8,81) at rw_enter+0xd4 rrw_enter(fffffd807177d7f8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd80726dc008,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd80726dc008,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd80726f9e20,ffff800023f3aff8,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd80726f9e20,0,ffff800023f3b250,ffff800023f3b1ec,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd80672a5e80,20002000,2,1) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd80672a5e80,20002000,20003000,1) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd80672a5e80,fffffd805f189e98,fffffd805ef99560,116,0,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlock(ffff8000212b0c70,ffff800023f3b438,ffff800023f3b480) at sys_mlock+0x180 sys/uvm/uvm_mmap.c:772 syscall(ffff800023f3b500) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800023f3b500) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:589 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x831e17da210, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff800023f3ac50 rbx 0x3 rdx 0xffff80000007e340 rcx 0x3 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffffffff821331b3 witness_checkorder+0xf33 r9 0x5 r10 0x9a7865d7ea3aea27 r11 0x30d09345f7ec77c1 r12 0xffffffff82879ed0 w_lodata+0x54430 r13 0 r14 0xffffffff82861fe0 w_lodata+0x3c540 r15 0xfffffd8002c91500 rip 0xffffffff81cb19d8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023f3ac40 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=193107 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff8000212b1b40,0xffffffff828804a8 process=0xffff8000212723f8 user=0xffff800023f36000, vmspace=0xfffffd80672a5e80 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 46809 251182 54710 0 2 0 syz-executor.0 *46809 193107 54710 0 7 0x4000000 syz-executor.0 72164 68619 43642 0 3 0x82 nanosleep syz-executor.1 54710 238560 43642 0 3 0x82 nanosleep syz-executor.0 27890 439110 0 0 3 0x14200 bored sosplice 43642 342132 67520 0 3 0x82 thrsleep syz-fuzzer 43642 396380 67520 0 3 0x4000082 thrsleep syz-fuzzer 43642 398297 67520 0 3 0x4000082 thrsleep syz-fuzzer 43642 503663 67520 0 3 0x4000082 thrsleep syz-fuzzer 43642 67036 67520 0 3 0x4000082 kqread syz-fuzzer 43642 205023 67520 0 3 0x4000082 thrsleep syz-fuzzer 43642 66917 67520 0 3 0x4000082 thrsleep syz-fuzzer 43642 497972 67520 0 3 0x4000082 thrsleep syz-fuzzer 67520 48008 40715 0 3 0x10008a pause ksh 40715 126100 17698 0 3 0x92 select sshd 38652 121104 1 0 3 0x100083 ttyin getty 17698 509275 1 0 3 0x80 select sshd 57269 257001 49974 74 3 0x100092 bpf pflogd 49974 440687 1 0 3 0x80 netio pflogd 94851 439586 87593 73 3 0x100090 kqread syslogd 87593 15448 1 0 3 0x100082 netio syslogd 55966 105479 1 77 3 0x100090 poll dhclient 24572 303658 1 0 3 0x80 poll dhclient 67247 485555 0 0 3 0x14200 bored smr 57938 166623 0 0 2 0x14200 zerothread 47362 279130 0 0 3 0x14200 aiodoned aiodoned 33345 323996 0 0 3 0x14200 syncer update 48066 300198 0 0 3 0x14200 cleaner cleaner 46825 153339 0 0 3 0x14200 reaper reaper 10810 372194 0 0 3 0x14200 pgdaemon pagedaemon 50408 100230 0 0 3 0x14200 bored crynlk 10386 236182 0 0 3 0x14200 bored crypto 72783 488711 0 0 3 0x14200 bored viomb 18135 236389 0 0 3 0x40014200 acpi0 acpi0 1291 284939 0 0 7 0x40014200 idle1 99199 170901 0 0 3 0x14200 bored softnet 14268 514137 0 0 3 0x14200 bored systqmp 80305 2072 0 0 3 0x14200 bored systq 23554 106187 0 0 3 0x40014200 bored softclock 43523 337837 0 0 3 0x40014200 idle0 1 69201 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 46809 (syz-executor.0) thread 0xffff8000212b0c70 (193107) shared rwlock vmmaplk r = 0 (0xfffffd80672a5e98) #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+0x120 sys/uvm/uvm_map.c:2463 #4 sys_mlock+0x180 sys/uvm/uvm_mmap.c:772 #5 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:589 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828806b8) #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:589 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9570 6458K 7864K 78643K 21783 0 pcb 13 8K 8K 78643K 460 0 rtable 100 5K 7K 78643K 1509 0 ifaddr 95 19K 19K 78643K 576 0 sysctl 3 1K 1K 78643K 3 0 counters 43 33K 34K 78643K 215 0 ioctlops 0 0K 4K 78643K 2278 0 iov 0 0K 32K 78643K 543 0 mount 1 1K 1K 78643K 1 0 vnodes 1214 76K 77K 78643K 5025 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 115 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 4460 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1825 197K 290K 78643K 13109 0 file desc 5 13K 25K 78643K 71301 0 sigio 0 0K 0K 78643K 44 0 proc 67 63K 95K 78643K 1412 0 subproc 32 2K 2K 78643K 153 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1148 0 in_multi 33 2K 2K 78643K 794 0 ether_multi 1 0K 0K 78643K 205 0 mrt 0 0K 0K 78643K 34 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 91 413K 413K 78643K 91 0 exec 0 0K 2K 78643K 815 0 pfkey data 0 0K 0K 78643K 1 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 506 285K 285K 78643K 149325 0 UVM aobj 131 8K 8K 78643K 158 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 1K 78643K 867 0 NDP 16 0K 0K 78643K 126 0 temp 155 3983K 4054K 78643K 160731 0 kqueue 3 4K 18K 78643K 766 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 24 0 17 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 96 292 0 290 1 0 1 1 0 8 0 rtentry 112 198 0 163 2 0 2 2 0 8 0 unpcb 120 6042 0 6022 4 3 1 2 0 8 0 syncache 272 59 0 59 11 11 0 1 0 8 0 tcpqe 32 210 0 210 11 11 0 1 0 8 0 tcpcb 592 5779 0 5770 46 45 1 8 0 8 0 inpcb 296 11229 0 11220 26 24 2 2 0 8 0 rttmr 72 11 0 11 3 3 0 1 0 8 0 nd6 48 55 0 49 1 0 1 1 0 8 0 pkpcb 40 52 0 52 11 11 0 1 0 8 0 kcovpl 48 9 0 7 1 0 1 1 0 8 0 ppxss 1128 19 0 19 8 8 0 1 0 8 0 pffrag 232 29 0 29 5 5 0 1 0 482 0 pffrnode 88 29 0 29 5 5 0 1 0 8 0 pffrent 40 929 0 929 6 6 0 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 pfrktable 1344 65 0 60 2 1 1 1 0 8 0 pftag 88 8 0 2 1 0 1 1 0 8 0 pfqueue 264 6 0 1 2 1 1 1 0 8 0 pfstitem 24 178 0 176 1 0 1 1 0 8 0 pfstkey 112 178 0 176 2 1 1 2 0 8 0 pfstate 328 177 0 175 6 5 1 6 0 8 0 pfrule 1360 63 0 42 3 1 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 639 0 505 16 4 12 14 0 8 0 art_table 32 640 0 505 2 0 2 2 0 8 0 art_node 16 195 0 166 1 0 1 1 0 8 0 sysvmsgpl 40 27 0 25 3 2 1 1 0 8 0 semapl 112 4458 0 4448 1 0 1 1 0 8 0 shmpl 112 155 0 27 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 75829 0 74422 96 7 89 89 0 8 0 ffsino 272 75829 0 74422 95 0 95 95 0 8 0 nchpl 144 152635 0 151039 60 0 60 60 0 8 0 uvmvnodes 72 72324 0 0 1315 0 1315 1315 0 8 0 vnodes 208 72324 0 0 3807 0 3807 3807 0 8 0 namei 1024 323953 0 323953 15 14 1 1 0 8 1 percpumem 16 118 0 86 1 0 1 1 0 8 0 vcpupl 1984 30 0 0 4 0 4 4 0 8 0 vmpool 560 59 0 29 4 1 3 3 0 8 0 pfiaddrpl 120 27 0 20 2 1 1 1 0 8 0 scsiplug 72 17 0 17 5 5 0 1 0 8 0 scxspl 192 449689 0 449689 27 26 1 7 0 8 1 plimitpl 152 838 0 830 1 0 1 1 0 8 0 sigapl 424 71499 0 71466 5 1 4 5 0 8 0 futexpl 56 482482 0 482482 16 15 1 1 0 8 1 knotepl 112 892 0 872 1 0 1 1 0 8 0 kqueuepl 152 71886 0 71879 1 0 1 1 0 8 0 pipepl 304 1223 0 1212 33 32 1 3 0 8 0 fdescpl 496 71480 0 71464 3 0 3 3 0 8 0 filepl 152 184684 0 184577 11 6 5 7 0 8 0 lockfpl 104 1495 0 1494 1 0 1 1 0 8 0 lockfspl 48 609 0 608 1 0 1 1 0 8 0 sessionpl 120 25 0 14 1 0 1 1 0 8 0 pgrppl 48 39 0 28 1 0 1 1 0 8 0 ucredpl 96 7143 0 7134 1 0 1 1 0 8 0 zombiepl 144 71466 0 71465 14 13 1 1 0 8 0 processpl 1008 71499 0 71465 5 0 5 5 0 8 0 procpl 632 144240 0 144198 11 7 4 5 0 8 0 srpgc 72 2 0 2 1 1 0 1 0 8 0 sosppl 144 173 0 173 18 18 0 1 0 8 0 sockpl 400 17660 0 17630 15 11 4 5 0 8 0 mcl64k 65536 19 0 0 3 0 3 3 0 8 0 mcl16k 16384 8 0 0 1 0 1 1 0 8 0 mcl12k 12288 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 18 0 0 3 1 2 3 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 1537 0 0 29 8 21 28 0 8 0 mtagpl 96 422 0 0 10 1 9 10 0 8 0 mbufpl 256 1872 0 0 68 11 57 68 0 8 0 bufpl 280 80757 0 74507 447 0 447 447 0 8 0 anonpl 16 4391794 0 4355710 367 213 154 154 0 124 8 amapchunkpl 152 227136 0 226371 80 50 30 30 0 158 0 amappl16 192 186150 0 184660 271 188 83 87 0 8 8 amappl15 184 6 0 4 1 0 1 1 0 8 0 amappl14 176 17348 0 17343 1 0 1 1 0 8 0 amappl13 168 47793 0 47789 1 0 1 1 0 8 0 amappl12 160 210 0 200 1 0 1 1 0 8 0 amappl11 152 80 0 62 1 0 1 1 0 8 0 amappl10 144 2466 0 2459 1 0 1 1 0 8 0 amappl9 136 544 0 544 2 2 0 1 0 8 0 amappl8 128 6449 0 6171 9 0 9 9 0 8 0 amappl7 120 620 0 613 1 0 1 1 0 8 0 amappl6 112 2575 0 2545 1 0 1 1 0 8 0 amappl5 104 25729 0 25712 1 0 1 1 0 8 0 amappl4 96 678 0 633 3 1 2 2 0 8 0 amappl3 88 95625 0 95611 1 0 1 1 0 8 0 amappl2 80 513656 0 513573 3 0 3 3 0 8 0 amappl1 72 1976315 0 1975830 27 17 10 19 0 8 0 amappl 80 144893 0 144695 5 0 5 5 0 84 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 64 157 0 27 3 0 3 3 0 8 0 uaddrrnd 24 71539 0 71493 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 71539 0 71493 1 0 1 1 0 8 0 vmmpekpl 168 212045 0 211999 4 1 3 3 0 8 0 vmmpepl 168 8860111 0 8856921 370 218 152 155 0 357 10 vmsppl 368 71538 0 71493 5 0 5 5 0 8 0 pdppl 4096 143085 0 143016 10 1 9 10 0 8 0 pvpl 32 19400591 0 19362923 816 494 322 322 0 265 17 pmappl 232 71538 0 71493 5 2 3 3 0 8 0 extentpl 40 57 0 39 1 0 1 1 0 8 0 phpool 112 380 0 71 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(fffffd807177d808,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd807177d808,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd807177d7f8,81) at rw_enter+0xd4 rrw_enter(fffffd807177d7f8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd80726dc008,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd80726dc008,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd80726f9e20,ffff800023f3aff8,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd80726f9e20,0,ffff800023f3b250,ffff800023f3b1ec,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd80672a5e80,20002000,2,1) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd80672a5e80,20002000,20003000,1) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd80672a5e80,fffffd805f189e98,fffffd805ef99560,116,0,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlock(ffff8000212b0c70,ffff800023f3b438,ffff800023f3b480) at sys_mlock+0x180 sys/uvm/uvm_mmap.c:772 syscall(ffff800023f3b500) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800023f3b500) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:589 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x831e17da210, 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 acpicpu_idle() at acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020d80ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: -5