witness: lock order reversal: 1st 0xfffffd807f004468 vmmaplk (&map->lock) 2nd 0xfffffd80669521b8 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(fffffd80669521b8,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd80669521b8,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd80669521a8,81) at rw_enter+0xd4 rrw_enter(fffffd80669521a8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd8067314b68,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd8067314b68,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd80688666c8,ffff800024d86d48,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd80688666c8,0,ffff800024d86fa0,ffff800024d86f34,0,0) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f004450,20002000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f004450,20002000,20005000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f004450,fffffd8066d3b170,fffffd8066d3bde8,ffff800022f6a000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020a98c70,ffff800024d87198,ffff800024d871e0) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024d87260) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024d87260) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8e577baa950, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024d869c0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022f6a000 rax 0xffff800000a6a8c0 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0x9417764c716e9f6 r12 0xfffffd800297b100 r13 0 r14 0xffffffff825e7cf0 w_lodata+0x40f80 r15 0xffffffff825fbeb0 w_lodata+0x55140 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024d869b0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=192524 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020a998c8,0xffff800020a98ef8 process=0xffff800020aa2e38 user=0xffff800024d82000, vmspace=0xfffffd807f004450 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 88799 120136 55758 32767 2 0x10 syz-executor.0 88799 226633 55758 32767 3 0x4000090 poll syz-executor.0 88799 86024 55758 32767 3 0x4000090 poll syz-executor.0 21550 316891 40925 32767 7 0x10 syz-executor.1 21550 192937 40925 32767 3 0x4000090 ttyout syz-executor.1 *21550 192524 40925 32767 7 0x4000010 syz-executor.1 21550 182798 40925 32767 3 0x4000090 fsleep syz-executor.1 40925 342955 43210 32767 3 0x90 nanosleep syz-executor.1 43210 53988 96356 0 3 0x82 wait syz-executor.1 55758 431144 15982 32767 3 0x90 nanosleep syz-executor.0 15982 154054 96356 0 3 0x82 wait syz-executor.0 6296 351128 0 0 3 0x14200 bored sosplice 96356 297036 94509 0 3 0x82 thrsleep syz-fuzzer 96356 311728 94509 0 3 0x4000082 thrsleep syz-fuzzer 96356 491378 94509 0 3 0x4000082 thrsleep syz-fuzzer 96356 61961 94509 0 3 0x4000082 thrsleep syz-fuzzer 96356 476908 94509 0 3 0x4000082 thrsleep syz-fuzzer 96356 63134 94509 0 3 0x4000082 thrsleep syz-fuzzer 96356 238069 94509 0 3 0x4000082 thrsleep syz-fuzzer 96356 390151 94509 0 3 0x4000082 kqread syz-fuzzer 96356 346037 94509 0 3 0x4000082 thrsleep syz-fuzzer 96356 182712 94509 0 3 0x4000082 thrsleep syz-fuzzer 94509 398387 10812 0 3 0x10008a pause ksh 10812 300432 18943 0 3 0x92 select sshd 32794 470189 1 0 3 0x100083 ttyin getty 18943 253714 1 0 3 0x80 select sshd 3400 40752 19123 73 3 0x100090 kqread syslogd 19123 264912 1 0 3 0x100082 netio syslogd 3688 263306 1 77 3 0x100090 poll dhclient 73827 296643 1 0 3 0x80 poll dhclient 7311 382867 0 0 2 0x14200 zerothread 12424 481882 0 0 3 0x14200 aiodoned aiodoned 50188 123415 0 0 3 0x14200 syncer update 22749 449934 0 0 3 0x14200 cleaner cleaner 54146 250109 0 0 3 0x14200 reaper reaper 1377 10012 0 0 3 0x14200 pgdaemon pagedaemon 4019 500695 0 0 3 0x14200 bored crynlk 83033 401856 0 0 3 0x14200 bored crypto 11115 455310 0 0 3 0x14200 bored viomb 95111 112219 0 0 3 0x40014200 acpi0 acpi0 65049 270847 0 0 3 0x40014200 idle1 94235 395416 0 0 3 0x14200 bored softnet 74601 147097 0 0 3 0x14200 bored systqmp 89770 78680 0 0 3 0x14200 bored systq 82135 401563 0 0 3 0x40014200 bored softclock 58209 385669 0 0 3 0x40014200 idle0 62889 376008 0 0 3 0x14200 bored smr 1 211010 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 21550 (syz-executor.1) thread 0xffff800020a98c70 (192524) shared rwlock vmmaplk r = 0 (0xfffffd807f004468) #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 9500 6344K 6344K 78643K 11223 0 pcb 13 10K 12K 78643K 15 0 rtable 105 3K 3K 78643K 6918 0 ifaddr 39 13K 15K 78643K 1170 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 288 0 iov 0 0K 32K 78643K 1283 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 5754 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 101 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 1948 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 8 25K 33K 78643K 6851 0 sigio 0 0K 0K 78643K 194 0 proc 48 50K 83K 78643K 7816 0 subproc 34 2K 2K 78643K 2720 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 2K 78643K 4345 0 in_multi 33 2K 2K 78643K 1903 0 ether_multi 1 0K 0K 78643K 21 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 186 821K 821K 78643K 186 0 exec 0 0K 1K 78643K 3044 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 175 35K 35K 78643K 26502 0 UVM aobj 130 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 783 0 NDP 7 0K 0K 78643K 483 0 temp 106 3034K 3148K 78643K 36652 0 kqueue 0 0K 0K 78643K 260 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 64 346 0 340 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 1356 0 1354 1 0 1 1 0 8 0 rtentry 112 1649 0 1605 2 0 2 2 0 8 0 unpcb 120 7804 0 7792 27 26 1 2 0 8 0 syncache 264 87 0 87 38 38 0 1 0 8 0 sackhl 24 6 0 6 5 5 0 1 0 8 0 tcpqe 32 73 0 73 23 23 0 1 0 8 0 tcpcb 544 7136 0 7131 108 106 2 13 0 8 1 ipq 40 70 0 70 26 26 0 1 0 8 0 ipqe 40 2214 0 2214 26 26 0 1 0 8 0 inpcb 280 13181 0 13173 76 74 2 9 0 8 1 ip6q 72 4 0 4 2 2 0 1 0 8 0 ip6af 40 12 0 12 2 2 0 1 0 8 0 nd6 48 320 0 316 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 7206 0 6990 14 0 14 14 0 8 0 art_table 32 7207 0 6990 2 0 2 2 0 8 0 art_node 16 1648 0 1608 1 0 1 1 0 8 0 sysvmsgpl 40 98 0 65 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 1946 0 1936 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 9275 0 7846 47 0 47 47 0 8 0 ffsino 272 9275 0 7846 96 0 96 96 0 8 0 nchpl 144 18036 0 16416 61 0 61 61 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 102879 0 102879 3 2 1 2 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 52837 0 52837 69 66 3 5 0 8 3 plimitpl 152 1230 0 1220 1 0 1 1 0 8 0 sigapl 432 6548 0 6532 11 9 2 3 0 8 0 futexpl 56 168673 0 168672 1 0 1 1 0 8 0 knotepl 112 4217 0 4198 15 13 2 3 0 8 1 kqueuepl 104 8264 0 8262 26 25 1 4 0 8 0 pipepl 160 6162 0 6143 23 21 2 2 0 8 1 fdescpl 488 6549 0 6532 3 0 3 3 0 8 0 filepl 152 87233 0 87128 111 103 8 15 0 8 3 lockfpl 104 2242 0 2240 1 0 1 1 0 8 0 lockfspl 48 719 0 717 1 0 1 1 0 8 0 sessionpl 112 175 0 165 1 0 1 1 0 8 0 pgrppl 48 252 0 242 1 0 1 1 0 8 0 ucredpl 96 26677 0 26668 1 0 1 1 0 8 0 zombiepl 144 6532 0 6532 1 0 1 1 0 8 1 processpl 904 6566 0 6532 12 8 4 5 0 8 0 procpl 632 18557 0 18509 5 0 5 5 0 8 1 srpgc 64 316 0 316 26 25 1 1 0 8 1 sosppl 128 157 0 157 33 32 1 1 0 8 1 sockpl 384 22619 0 22596 147 142 5 16 0 8 2 mcl64k 65536 35 0 0 5 2 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 49 0 0 2 0 2 2 0 8 0 mcl9k 9216 25 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 4 1 3 3 0 8 0 mcl4k 4096 33 0 0 4 1 3 3 0 8 0 mcl2k2 2112 11 0 0 1 0 1 1 0 8 0 mcl2k 2048 163 0 0 18 0 18 18 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 903 0 0 26 0 26 26 0 8 0 bufpl 280 23447 0 16381 507 1 506 506 0 8 0 anonpl 16 1059872 0 1044723 233 163 70 83 0 125 0 amapchunkpl 152 69204 0 68945 157 144 13 20 0 158 3 amappl16 192 36754 0 35875 285 229 56 57 0 8 7 amappl15 184 1040 0 1036 1 0 1 1 0 8 0 amappl14 176 1635 0 1630 1 0 1 1 0 8 0 amappl13 168 878 0 878 14 13 1 1 0 8 1 amappl12 160 857 0 849 2 1 1 1 0 8 0 amappl11 152 1294 0 1283 1 0 1 1 0 8 0 amappl10 144 715 0 710 1 0 1 1 0 8 0 amappl9 136 3139 0 3136 1 0 1 1 0 8 0 amappl8 128 1950 0 1876 6 3 3 3 0 8 0 amappl7 120 1715 0 1699 1 0 1 1 0 8 0 amappl6 112 936 0 922 1 0 1 1 0 8 0 amappl5 104 2132 0 2116 1 0 1 1 0 8 0 amappl4 96 7064 0 7032 1 0 1 1 0 8 0 amappl3 88 1491 0 1479 1 0 1 1 0 8 0 amappl2 80 40248 0 40167 3 1 2 3 0 8 0 amappl1 72 193702 0 193212 24 14 10 20 0 8 0 amappl 80 21501 0 21449 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 64 132 0 3 3 0 3 3 0 8 0 uaddrrnd 24 6549 0 6532 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6549 0 6532 1 0 1 1 0 8 0 vmmpekpl 168 66244 0 66220 2 0 2 2 0 8 0 vmmpepl 168 955686 0 953356 333 189 144 145 0 357 39 vmsppl 368 6548 0 6532 2 0 2 2 0 8 0 pdppl 4096 13105 0 13064 6 0 6 6 0 8 0 pvpl 32 2682816 0 2664478 513 340 173 205 0 265 10 pmappl 232 6548 0 6532 22 20 2 2 0 8 1 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 309 0 123 7 1 6 6 0 8 0