witness: lock order reversal: 1st 0xfffffd806e8b9470 vmmaplk (&map->lock) 2nd 0xfffffd8065fa1a30 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(fffffd8065fa1a30,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd8065fa1a30,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd8065fa1a20,81) at rw_enter+0xd4 rrw_enter(fffffd8065fa1a20,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd80730a0de0,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd80730a0de0,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd8066d5a5b8,ffff800024f73a18,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd8066d5a5b8,0,ffff800024f73c70,ffff800024f73c04,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd806e8b9458,20002000,2,1) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd806e8b9458,20002000,20003000,1) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd806e8b9458,fffffd806b3ae250,fffffd8066d86780,ffff800020d4e000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020a993d8,ffff800024f73e68,ffff800024f73eb0) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024f73f30) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024f73f30) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xcdf03ec1310, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024f73690 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020d4e000 rax 0xffff800000a08540 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xc33d80b204b442e1 r12 0xfffffd800297b100 r13 0 r14 0xffffffff825ed7b0 w_lodata+0x46a40 r15 0xffffffff825fbd50 w_lodata+0x54fe0 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024f73680 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=517341 stat=onproc flags process=10 proc=4000000 pri=78, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff800020a98ee8,0xffffffff82659068 process=0xffff800020aa3c58 user=0xffff800024f6e000, vmspace=0xfffffd806e8b9458 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 54299 186110 11804 32767 7 0x10 syz-executor.0 54299 301603 11804 32767 3 0x4000090 ttyout syz-executor.0 *54299 517341 11804 32767 7 0x4000010 syz-executor.0 5988 125065 44149 32767 3 0x90 nanosleep syz-executor.1 5988 377246 44149 32767 3 0x4000090 kqread syz-executor.1 5988 220364 44149 32767 3 0x4000090 fsleep syz-executor.1 44149 73904 11916 32767 3 0x90 nanosleep syz-executor.1 11916 159147 93076 0 3 0x82 wait syz-executor.1 11804 198805 66466 32767 3 0x90 nanosleep syz-executor.0 66466 123655 93076 0 3 0x82 wait syz-executor.0 78947 516924 0 0 3 0x14200 bored sosplice 93076 502713 12429 0 3 0x82 thrsleep syz-fuzzer 93076 331267 12429 0 3 0x4000082 thrsleep syz-fuzzer 93076 22543 12429 0 3 0x4000082 thrsleep syz-fuzzer 93076 388167 12429 0 3 0x4000082 thrsleep syz-fuzzer 93076 109102 12429 0 3 0x4000082 thrsleep syz-fuzzer 93076 375411 12429 0 3 0x4000082 thrsleep syz-fuzzer 93076 181757 12429 0 3 0x4000082 thrsleep syz-fuzzer 93076 261549 12429 0 3 0x4000082 thrsleep syz-fuzzer 93076 277067 12429 0 3 0x4000082 kqread syz-fuzzer 93076 516793 12429 0 3 0x4000082 thrsleep syz-fuzzer 12429 458369 15107 0 3 0x10008a pause ksh 15107 448535 61359 0 3 0x92 select sshd 30636 8808 1 0 3 0x100083 ttyin getty 61359 32840 1 0 3 0x80 select sshd 37740 169938 40002 73 3 0x100090 kqread syslogd 40002 64707 1 0 3 0x100082 netio syslogd 65405 409261 1 77 3 0x100090 poll dhclient 85547 478115 1 0 3 0x80 poll dhclient 95 186381 0 0 3 0x14200 pgzero zerothread 62742 373560 0 0 3 0x14200 aiodoned aiodoned 95833 113876 0 0 3 0x14200 syncer update 60806 489448 0 0 3 0x14200 cleaner cleaner 39569 42870 0 0 3 0x14200 reaper reaper 84878 346822 0 0 3 0x14200 pgdaemon pagedaemon 76957 417121 0 0 3 0x14200 bored crynlk 2742 298930 0 0 3 0x14200 bored crypto 97526 121340 0 0 3 0x14200 bored viomb 87670 207948 0 0 3 0x40014200 acpi0 acpi0 93325 173641 0 0 3 0x40014200 idle1 42519 351809 0 0 3 0x14200 bored softnet 82628 347555 0 0 3 0x14200 bored systqmp 57826 501440 0 0 3 0x14200 bored systq 86660 45481 0 0 3 0x40014200 bored softclock 39247 312465 0 0 3 0x40014200 idle0 21169 122634 0 0 3 0x14200 bored smr 1 497885 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 54299 (syz-executor.0) thread 0xffff800020a993d8 (517341) shared rwlock vmmaplk r = 0 (0xfffffd806e8b9470) #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 9495 6343K 6343K 78643K 10818 0 pcb 13 10K 12K 78643K 15 0 rtable 105 3K 3K 78643K 2746 0 ifaddr 39 10K 10K 78643K 450 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 134 0 iov 0 0K 48K 78643K 559 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 2613 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 52 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1905 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 8 25K 33K 78643K 2683 0 sigio 0 0K 0K 78643K 71 0 proc 48 50K 83K 78643K 3157 0 subproc 34 2K 2K 78643K 1020 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 1K 78643K 632 0 in_multi 33 2K 2K 78643K 738 0 ether_multi 1 0K 0K 78643K 14 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 156 689K 689K 78643K 156 0 exec 0 0K 1K 78643K 1253 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 156 33K 38K 78643K 11842 0 UVM aobj 130 6K 6K 78643K 135 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 1K 78643K 252 0 NDP 7 0K 0K 78643K 183 0 temp 106 3034K 3113K 78643K 16656 0 kqueue 0 0K 0K 78643K 773 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 64 135 0 129 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 1809 0 1806 1 0 1 1 0 8 0 rtentry 112 638 0 594 2 0 2 2 0 8 0 unpcb 120 3085 0 3072 11 9 2 2 0 8 1 syncache 264 49 0 49 14 13 1 1 0 8 1 sackhl 24 3 0 3 3 3 0 1 0 8 0 tcpqe 32 13 0 13 10 9 1 1 0 8 1 tcpcb 544 3662 0 3655 60 59 1 14 0 8 0 ipq 40 46 0 46 12 11 1 1 0 8 1 ipqe 40 1587 0 1587 12 11 1 1 0 8 1 inpcb 280 6371 0 6357 48 46 2 9 0 8 0 ip6q 72 8 0 8 5 5 0 1 0 8 0 ip6af 40 18 0 18 5 5 0 1 0 8 0 nd6 48 120 0 116 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2739 0 2524 14 0 14 14 0 8 0 art_table 32 2740 0 2524 2 0 2 2 0 8 0 art_node 16 637 0 597 1 0 1 1 0 8 0 sysvmsgpl 40 49 0 27 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 1903 0 1893 1 0 1 1 0 8 0 shmpl 112 133 0 5 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 4237 0 2829 46 0 46 46 0 8 0 ffsino 272 4237 0 2829 95 0 95 95 0 8 0 nchpl 144 7730 0 6123 60 0 60 60 0 8 0 uvmvnodes 72 5266 0 0 96 0 96 96 0 8 0 vnodes 208 5266 0 0 278 0 278 278 0 8 0 namei 1024 36696 0 36696 2 1 1 2 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 24804 0 24804 36 32 4 7 0 8 4 plimitpl 152 493 0 483 1 0 1 1 0 8 0 sigapl 432 2680 0 2664 3 1 2 3 0 8 0 futexpl 56 71269 0 71268 1 0 1 1 0 8 0 knotepl 112 3110 0 3091 16 15 1 3 0 8 0 kqueuepl 104 3311 0 3308 13 12 1 4 0 8 0 pipepl 160 2534 0 2515 14 13 1 2 0 8 0 fdescpl 488 2681 0 2664 3 0 3 3 0 8 0 filepl 152 31996 0 31888 62 56 6 14 0 8 1 lockfpl 104 1011 0 1010 1 0 1 1 0 8 0 lockfspl 48 293 0 292 1 0 1 1 0 8 0 sessionpl 112 75 0 65 1 0 1 1 0 8 0 pgrppl 48 108 0 98 1 0 1 1 0 8 0 ucredpl 96 6004 0 5995 1 0 1 1 0 8 0 zombiepl 144 2664 0 2664 1 0 1 1 0 8 1 processpl 904 2698 0 2664 4 0 4 4 0 8 0 procpl 632 8480 0 8433 5 0 5 5 0 8 1 srpgc 64 116 0 116 18 17 1 1 0 8 1 sosppl 128 312 0 312 6 5 1 1 0 8 1 sockpl 384 11368 0 11342 82 76 6 14 0 8 2 mcl64k 65536 18 0 0 3 0 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 19 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 4 1 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 164 0 0 17 1 16 17 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 642 0 0 24 1 23 23 0 8 0 bufpl 280 14223 0 7157 507 1 506 506 0 8 0 anonpl 16 433226 0 418376 145 77 68 81 0 125 0 amapchunkpl 152 28780 0 28519 79 68 11 19 0 158 0 amappl16 192 14288 0 13417 179 133 46 56 0 8 0 amappl15 184 785 0 781 1 0 1 1 0 8 0 amappl14 176 664 0 662 1 0 1 1 0 8 0 amappl13 168 449 0 449 7 6 1 1 0 8 1 amappl12 160 258 0 253 1 0 1 1 0 8 0 amappl11 152 448 0 437 1 0 1 1 0 8 0 amappl10 144 141 0 137 1 0 1 1 0 8 0 amappl9 136 1491 0 1488 1 0 1 1 0 8 0 amappl8 128 784 0 726 3 0 3 3 0 8 0 amappl7 120 599 0 582 1 0 1 1 0 8 0 amappl6 112 338 0 328 1 0 1 1 0 8 0 amappl5 104 863 0 850 1 0 1 1 0 8 0 amappl4 96 3098 0 3066 1 0 1 1 0 8 0 amappl3 88 605 0 596 1 0 1 1 0 8 0 amappl2 80 16696 0 16616 3 0 3 3 0 8 0 amappl1 72 84977 0 84489 24 14 10 20 0 8 0 amappl 80 9669 0 9622 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 64 134 0 5 3 0 3 3 0 8 0 uaddrrnd 24 2681 0 2664 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2681 0 2664 1 0 1 1 0 8 0 vmmpekpl 168 32051 0 32025 2 0 2 2 0 8 0 vmmpepl 168 391206 0 388921 242 111 131 138 0 357 28 vmsppl 368 2680 0 2664 2 0 2 2 0 8 0 pdppl 4096 5369 0 5328 6 0 6 6 0 8 0 pvpl 32 1113275 0 1094570 338 180 158 196 0 265 0 pmappl 232 2680 0 2664 14 12 2 2 0 8 1 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 245 0 66 7 1 6 6 0 8 0