witness: lock order reversal: 1st 0xfffffd807f004188 vmmaplk (&map->lock) 2nd 0xfffffd8066d4c5e8 inode (&ip->i_lock) lock order "&ip->i_lock"(rrwlock) -> "&map->lock"(rwlock) first seen at: #0 witness_checkorder+0x69c witness_lock_order_check sys/kern/subr_witness.c:2441 [inline] #0 witness_checkorder+0x69c sys/kern/subr_witness.c:872 #1 rw_enter+0xd4 #2 vm_map_lock_ln+0x10d sys/uvm/uvm_map.c:5406 #3 uvm_map+0x2da sys/uvm/uvm_map.c:1233 #4 km_alloc+0x18b sys/uvm/uvm_km.c:908 #5 pool_multi_alloc_ni+0xd0 sys/kern/subr_pool.c:1692 #6 pool_p_alloc+0x74 pool_allocator_alloc sys/kern/subr_pool.c:1606 [inline] #6 pool_p_alloc+0x74 sys/kern/subr_pool.c:927 #7 pool_do_get+0x10f sys/kern/subr_pool.c:712 #8 pool_get+0xeb sys/kern/subr_pool.c:581 #9 ufsdirhash_build+0x3ea sys/ufs/ufs/ufs_dirhash.c:180 #10 ufs_lookup+0x2a1 sys/ufs/ufs/ufs_lookup.c:200 #11 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:91 #12 vfs_lookup+0x7a6 sys/kern/vfs_lookup.c:568 #13 namei+0x63c sys/kern/vfs_lookup.c:249 #14 start_init+0xc9 check_console sys/kern/init_main.c:596 [inline] #14 start_init+0xc9 sys/kern/init_main.c:636 #15 proc_trampoline+0x1c lock order "&map->lock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at: #0 witness_checkorder+0x69c witness_lock_order_check sys/kern/subr_witness.c:2441 [inline] #0 witness_checkorder+0x69c sys/kern/subr_witness.c:872 #1 rw_enter+0xd4 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453 #3 VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:571 #5 uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 #6 uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 #7 uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 #8 uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 #9 uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 #10 sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 #11 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #11 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #12 Xsyscall+0x128 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 witness_checkorder(fffffd8066d4c5e8,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd8066d4c5e8,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd8066d4c5d8,81) at rw_enter+0xd4 rrw_enter(fffffd8066d4c5d8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd806b3a7d18,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd806b3a7d18,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd807ebd5438,ffff800024ff6a98,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd807ebd5438,0,ffff800024ff6cf0,ffff800024ff6c84,0,0) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f004170,20002000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f004170,20002000,20005000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f004170,fffffd806b3b84c8,fffffd806b3b8420,ffff800023170000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020aa1b50,ffff800024ff6ee8,ffff800024ff6f30) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024ff6fb0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024ff6fb0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8acb6090e50, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024ff6710 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800023170000 rax 0xffff8000009f58c0 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xcd82531e7f9d0df r12 0xfffffd800297b100 r13 0 r14 0xffffffff825ed4f0 w_lodata+0x46780 r15 0xffffffff825fbbf0 w_lodata+0x54e80 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024ff6700 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=459226 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020aa0518,0xffffffff82659068 process=0xffff800020aa2ab0 user=0xffff800024ff2000, vmspace=0xfffffd807f004170 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 14327 506308 73500 32767 2 0x10 syz-executor.1 14327 478118 73500 32767 3 0x4000090 ttyout syz-executor.1 14327 184254 73500 32767 2 0x4000010 syz-executor.1 *14327 459226 73500 32767 7 0x4000010 syz-executor.1 27256 263043 44486 32767 7 0x10 syz-executor.0 27256 134740 44486 32767 3 0x4000090 fsleep syz-executor.0 27256 324173 44486 32767 3 0x4000090 fsleep syz-executor.0 27256 185624 44486 32767 2 0x4000010 syz-executor.0 27256 200032 44486 32767 3 0x4000090 fsleep syz-executor.0 27256 335662 44486 32767 3 0x4000090 fsleep syz-executor.0 73500 452964 86698 32767 3 0x90 nanosleep syz-executor.1 86698 161020 4532 0 3 0x82 wait syz-executor.1 44486 493754 55825 32767 3 0x90 nanosleep syz-executor.0 55825 74657 4532 0 3 0x82 wait syz-executor.0 90621 516185 0 0 3 0x14200 bored sosplice 4532 321482 52014 0 3 0x82 thrsleep syz-fuzzer 4532 259946 52014 0 3 0x4000082 thrsleep syz-fuzzer 4532 298626 52014 0 3 0x4000082 thrsleep syz-fuzzer 4532 92211 52014 0 3 0x4000082 thrsleep syz-fuzzer 4532 154796 52014 0 3 0x4000082 thrsleep syz-fuzzer 4532 60279 52014 0 3 0x4000082 thrsleep syz-fuzzer 4532 239314 52014 0 3 0x4000082 thrsleep syz-fuzzer 4532 191878 52014 0 3 0x4000082 thrsleep syz-fuzzer 4532 456070 52014 0 3 0x4000082 thrsleep syz-fuzzer 4532 50711 52014 0 3 0x4000082 kqread syz-fuzzer 52014 523695 3985 0 3 0x10008a pause ksh 3985 14935 51603 0 3 0x92 select sshd 79772 504083 1 0 3 0x100083 ttyin getty 51603 240173 1 0 3 0x80 select sshd 48113 400713 27531 73 3 0x100090 kqread syslogd 27531 100093 1 0 3 0x100082 netio syslogd 50013 202397 1 77 3 0x100090 poll dhclient 25284 71874 1 0 3 0x80 poll dhclient 50234 486916 0 0 2 0x14200 zerothread 63472 414792 0 0 3 0x14200 aiodoned aiodoned 61230 228700 0 0 3 0x14200 syncer update 53853 327909 0 0 3 0x14200 cleaner cleaner 86428 137943 0 0 3 0x14200 reaper reaper 67683 25400 0 0 3 0x14200 pgdaemon pagedaemon 88698 266681 0 0 3 0x14200 bored crynlk 39538 300552 0 0 3 0x14200 bored crypto 9208 110632 0 0 3 0x14200 bored viomb 67851 453347 0 0 3 0x40014200 acpi0 acpi0 89025 98891 0 0 3 0x40014200 idle1 33888 67977 0 0 3 0x14200 bored softnet 96910 73203 0 0 3 0x14200 bored systqmp 46560 471259 0 0 3 0x14200 bored systq 40020 184633 0 0 3 0x40014200 bored softclock 23667 172776 0 0 3 0x40014200 idle0 57768 53620 0 0 3 0x14200 bored smr 1 267282 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 14327 (syz-executor.1) thread 0xffff800020aa1b50 (459226) shared rwlock vmmaplk r = 0 (0xfffffd807f004188) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:309 #2 vm_map_lock_ln+0x10d sys/uvm/uvm_map.c:5406 #3 uvm_map_pageable+0x11d sys/uvm/uvm_map.c:2454 #4 sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82657328) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline] #1 syscall+0x400 sys/arch/amd64/amd64/trap.c:555 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9486 6342K 6342K 78643K 10844 0 pcb 13 10K 12K 78643K 15 0 rtable 105 3K 3K 78643K 3065 0 ifaddr 39 11K 12K 78643K 521 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 162 0 iov 0 0K 48K 78643K 602 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 2749 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 25 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 1033 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 8 25K 33K 78643K 2738 0 sigio 0 0K 0K 78643K 56 0 proc 48 50K 83K 78643K 3465 0 subproc 34 2K 2K 78643K 1173 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 1K 78643K 509 0 in_multi 33 2K 2K 78643K 849 0 ether_multi 1 0K 0K 78643K 10 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 102 450K 450K 78643K 102 0 exec 0 0K 1K 78643K 1388 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 147 32K 32K 78643K 11454 0 UVM aobj 130 4K 4K 78643K 146 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 1 0K 1K 78643K 1060 0 NDP 5 0K 0K 78643K 210 0 temp 106 3034K 3120K 78643K 16568 0 kqueue 0 0K 0K 78643K 76 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 149 0 143 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 493 0 491 1 0 1 1 0 8 0 rtentry 112 724 0 680 2 0 2 2 0 8 0 unpcb 120 2687 0 2677 8 7 1 2 0 8 0 syncache 264 35 0 35 13 13 0 1 0 8 0 tcpqe 32 29 0 29 10 10 0 1 0 8 0 tcpcb 544 3074 0 3069 27 25 2 13 0 8 1 ipq 40 45 0 45 15 15 0 1 0 8 0 ipqe 40 1514 0 1514 15 15 0 1 0 8 0 inpcb 280 6299 0 6289 24 22 2 9 0 8 1 ip6q 72 6 0 6 4 4 0 1 0 8 0 ip6af 40 192 0 192 4 4 0 1 0 8 0 nd6 48 138 0 134 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 3202 0 2987 14 0 14 14 0 8 0 art_table 32 3203 0 2987 2 0 2 2 0 8 0 art_node 16 723 0 683 1 0 1 1 0 8 0 sysvmsgpl 40 77 0 53 1 0 1 1 0 8 0 semupl 112 7 0 7 1 1 0 1 0 8 0 semapl 112 1023 0 1013 1 0 1 1 0 8 0 shmpl 112 144 0 16 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 4121 0 2710 46 0 46 46 0 8 0 ffsino 272 4121 0 2710 95 0 95 95 0 8 0 nchpl 144 7498 0 5889 60 0 60 60 0 8 0 uvmvnodes 72 5303 0 0 97 0 97 97 0 8 0 vnodes 208 5303 0 0 280 0 280 280 0 8 0 namei 1024 35335 0 35335 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 24425 0 24425 39 36 3 7 0 8 3 plimitpl 152 530 0 521 1 0 1 1 0 8 0 sigapl 432 2708 0 2692 5 3 2 3 0 8 0 futexpl 56 54083 0 54079 1 0 1 1 0 8 0 knotepl 112 1446 0 1427 6 5 1 2 0 8 0 kqueuepl 104 1595 0 1591 8 7 1 4 0 8 0 pipepl 160 2588 0 2565 14 12 2 2 0 8 1 fdescpl 488 2709 0 2692 3 0 3 3 0 8 0 filepl 152 28753 0 28639 50 44 6 12 0 8 1 lockfpl 104 680 0 678 1 0 1 1 0 8 0 lockfspl 48 222 0 220 1 0 1 1 0 8 0 sessionpl 112 84 0 74 1 0 1 1 0 8 0 pgrppl 48 127 0 117 1 0 1 1 0 8 0 ucredpl 96 5563 0 5554 1 0 1 1 0 8 0 zombiepl 144 2692 0 2692 1 0 1 1 0 8 1 processpl 904 2726 0 2692 6 2 4 5 0 8 0 procpl 632 7738 0 7687 6 1 5 5 0 8 0 srpgc 64 134 0 134 18 17 1 1 0 8 1 sosppl 128 100 0 100 21 20 1 1 0 8 1 sockpl 384 9577 0 9555 50 46 4 14 0 8 1 mcl64k 65536 33 0 0 4 1 3 3 0 8 0 mcl16k 16384 17 0 0 3 1 2 3 0 8 0 mcl12k 12288 26 0 0 2 0 2 2 0 8 0 mcl9k 9216 20 0 0 2 0 2 2 0 8 0 mcl8k 8192 23 0 0 3 1 2 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 171 0 0 19 0 19 19 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 623 0 0 22 0 22 22 0 8 0 bufpl 280 12587 0 5521 505 0 505 505 0 8 0 anonpl 16 365883 0 350589 111 44 67 80 0 125 0 amapchunkpl 152 28195 0 27934 77 66 11 13 0 158 0 amappl16 192 11816 0 10935 122 75 47 57 0 8 0 amappl15 184 662 0 658 1 0 1 1 0 8 0 amappl14 176 664 0 662 1 0 1 1 0 8 0 amappl13 168 174 0 174 5 5 0 1 0 8 0 amappl12 160 339 0 336 1 0 1 1 0 8 0 amappl11 152 486 0 472 1 0 1 1 0 8 0 amappl10 144 238 0 235 2 1 1 1 0 8 0 amappl9 136 1746 0 1742 1 0 1 1 0 8 0 amappl8 128 1035 0 987 3 1 2 2 0 8 0 amappl7 120 706 0 691 1 0 1 1 0 8 0 amappl6 112 359 0 345 1 0 1 1 0 8 0 amappl5 104 995 0 985 1 0 1 1 0 8 0 amappl4 96 3057 0 3027 1 0 1 1 0 8 0 amappl3 88 340 0 332 1 0 1 1 0 8 0 amappl2 80 16066 0 15987 3 1 2 3 0 8 0 amappl1 72 86014 0 85519 24 14 10 20 0 8 0 amappl 80 9087 0 9039 2 0 2 2 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 64 145 0 16 3 0 3 3 0 8 0 uaddrrnd 24 2709 0 2692 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2709 0 2692 1 0 1 1 0 8 0 vmmpekpl 168 29852 0 29826 2 0 2 2 0 8 0 vmmpepl 168 394074 0 391781 276 152 124 139 0 357 24 vmsppl 368 2708 0 2692 2 0 2 2 0 8 0 pdppl 4096 5425 0 5384 6 0 6 6 0 8 0 pvpl 32 1038747 0 1019713 294 127 167 191 0 265 8 pmappl 232 2708 0 2692 15 14 1 2 0 8 0 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 212 0 32 6 0 6 6 0 8 0