witness: lock order reversal: 1st 0xfffffd807f005a28 vmmaplk (&map->lock) 2nd 0xfffffd806f763e78 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(fffffd806f763e78,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd806f763e78,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd806f763e68,81) at rw_enter+0xd4 rrw_enter(fffffd806f763e68,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd80661a1270,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd80661a1270,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd80661a08c8,ffff800021bad228,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd80661a08c8,0,ffff800021bad480,ffff800021bad414,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f005a10,20002000,2,1) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f005a10,20002000,20003000,1) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f005a10,fffffd8065d27ab8,fffffd8065d278c0,ffff800020b76000,ffffffff8211d1e7,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020a98508,ffff800021bad678,ffff800021bad6c0) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800021bad740) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021bad740) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xaecb0c450, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800021bacea0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020b76000 rax 0xffff8000009c9500 r8 0xffffffff8211afe2 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xb5173a5083650bba r12 0xfffffd800297c100 r13 0 r14 0xffffffff825fb300 w_lodata+0x4b8a0 r15 0xffffffff82604830 w_lodata+0x54dd0 rip 0xffffffff815de968 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021bace90 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=181384 stat=onproc flags process=0 proc=4000000 pri=74, usrpri=74, nice=20 forw=0xffffffffffffffff, list=0xffff800020a98018,0xffff800020a98ef8 process=0xffff800020a9bc50 user=0xffff800021ba8000, vmspace=0xfffffd807f005a10 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 61857 428544 31820 0 2 0 syz-executor.1 61857 13919 31820 0 3 0x4000080 bell syz-executor.1 97132 474934 57762 0 7 0 syz-executor.0 *97132 181384 57762 0 7 0x4000000 syz-executor.0 31820 404497 43472 0 3 0x82 nanosleep syz-executor.1 57762 498937 43472 0 3 0x82 nanosleep syz-executor.0 43472 123653 52363 0 3 0x82 thrsleep syz-fuzzer 43472 50127 52363 0 3 0x4000082 thrsleep syz-fuzzer 43472 417989 52363 0 3 0x4000082 thrsleep syz-fuzzer 43472 66030 52363 0 3 0x4000082 thrsleep syz-fuzzer 43472 243621 52363 0 3 0x4000082 thrsleep syz-fuzzer 43472 421120 52363 0 3 0x4000082 thrsleep syz-fuzzer 43472 142770 52363 0 3 0x4000082 thrsleep syz-fuzzer 43472 155643 52363 0 3 0x4000082 kqread syz-fuzzer 43472 212967 52363 0 3 0x4000082 thrsleep syz-fuzzer 43472 462324 52363 0 3 0x4000082 thrsleep syz-fuzzer 52363 186507 73671 0 3 0x10008a pause ksh 73671 500508 49539 0 3 0x92 select sshd 9783 458609 1 0 3 0x100083 ttyin getty 49539 401014 1 0 3 0x80 select sshd 85690 520104 46692 74 3 0x100092 bpf pflogd 46692 6880 1 0 3 0x80 netio pflogd 70689 472138 13803 73 3 0x100090 kqread syslogd 13803 413680 1 0 3 0x100082 netio syslogd 71217 193485 1 77 3 0x100090 poll dhclient 66486 475749 1 0 3 0x80 poll dhclient 67763 249462 0 0 2 0x14200 zerothread 26729 472327 0 0 3 0x14200 aiodoned aiodoned 19989 448498 0 0 3 0x14200 syncer update 88887 521491 0 0 3 0x14200 cleaner cleaner 19051 391092 0 0 3 0x14200 reaper reaper 59253 396897 0 0 3 0x14200 pgdaemon pagedaemon 93860 518830 0 0 3 0x14200 bored crynlk 89897 295418 0 0 3 0x14200 bored crypto 96248 441451 0 0 3 0x14200 bored viomb 59876 304435 0 0 3 0x40014200 acpi0 acpi0 81543 172978 0 0 3 0x40014200 idle1 61683 396252 0 0 3 0x14200 bored softnet 74186 67340 0 0 3 0x14200 bored systqmp 21992 220798 0 0 3 0x14200 bored systq 52338 121273 0 0 3 0x40014200 bored softclock 14422 394267 0 0 3 0x40014200 idle0 35491 264361 0 0 3 0x14200 bored smr 1 502086 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 97132 (syz-executor.0) thread 0xffff800020a98508 (181384) shared rwlock vmmaplk r = 0 (0xfffffd807f005a28) #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 (0xffffffff8265cfc8) #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 9528 6433K 7403K 78643K 11730 0 pcb 13 8K 8K 78643K 114 0 rtable 102 3K 4K 78643K 410 0 ifaddr 69 13K 14K 78643K 144 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1473 0 iov 0 0K 16K 78643K 42 0 mount 1 1K 1K 78643K 1 0 vnodes 1231 77K 77K 78643K 1549 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 4 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 133 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 6 17K 25K 78643K 272 0 sigio 2 0K 0K 78643K 32 0 proc 60 63K 95K 78643K 564 0 subproc 32 2K 2K 78643K 68 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 28 0 in_multi 41 2K 3K 78643K 76 0 ether_multi 1 0K 0K 78643K 7 0 mrt 0 0K 0K 78643K 16 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 54 238K 238K 78643K 54 0 exec 0 0K 1K 78643K 254 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 118 22K 24K 78643K 1837 0 UVM aobj 9 2K 2K 78643K 9 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 38 0 NDP 12 0K 0K 78643K 32 0 temp 131 3030K 3094K 78643K 15422 0 kqueue 0 0K 0K 78643K 1 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 12 0 8 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 39 0 37 1 0 1 1 0 8 0 rtentry 112 79 0 38 2 0 2 2 0 8 0 unpcb 120 130 0 120 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 369 0 369 2 2 0 2 0 8 0 tcpcb 544 93 0 89 1 0 1 1 0 8 0 inpcb 280 402 0 395 2 0 2 2 0 8 1 rttmr 72 7 0 7 2 1 1 1 0 8 1 nd6 48 8 0 4 1 0 1 1 0 8 0 pkpcb 40 8 0 8 1 0 1 1 0 8 1 swfcl 56 2 0 0 1 0 1 1 0 8 0 ppxss 1128 10 0 10 1 0 1 1 0 8 1 pffrag 232 5 0 5 1 0 1 1 0 482 1 pffrnode 88 5 0 5 1 0 1 1 0 8 1 pffrent 40 225 0 225 1 0 1 1 0 8 1 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 36 0 2 1 0 1 1 0 8 0 pfstkey 112 36 0 2 1 0 1 1 0 8 0 pfstate 328 36 0 2 3 0 3 3 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 321 0 99 15 0 15 15 0 8 0 art_table 32 323 0 99 2 0 2 2 0 8 0 art_node 16 78 0 41 1 0 1 1 0 8 0 sysvmsgpl 40 30 0 16 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 127 0 117 1 0 1 1 0 8 0 shmpl 112 7 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1794 0 383 46 0 46 46 0 8 0 ffsino 272 1794 0 383 95 0 95 95 0 8 0 nchpl 144 2440 0 834 61 0 61 61 0 8 0 uvmvnodes 72 2101 0 0 39 0 39 39 0 8 0 vnodes 208 2101 0 0 111 0 111 111 0 8 0 namei 1024 7247 0 7247 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 7742 0 7742 10 7 3 7 0 8 3 plimitpl 152 32 0 24 1 0 1 1 0 8 0 sigapl 432 465 0 449 3 1 2 3 0 8 0 futexpl 56 5604 0 5604 1 0 1 1 0 8 1 knotepl 112 93 0 74 1 0 1 1 0 8 0 kqueuepl 104 42 0 40 1 0 1 1 0 8 0 pipepl 160 334 0 313 3 1 2 2 0 8 1 fdescpl 488 466 0 449 3 0 3 3 0 8 0 filepl 152 3440 0 3333 7 1 6 6 0 8 1 lockfpl 104 63 0 61 1 0 1 1 0 8 0 lockfspl 48 24 0 22 1 0 1 1 0 8 0 sessionpl 112 20 0 9 1 0 1 1 0 8 0 pgrppl 48 30 0 19 1 0 1 1 0 8 0 ucredpl 96 356 0 347 1 0 1 1 0 8 0 zombiepl 144 449 0 449 3 2 1 1 0 8 1 processpl 904 482 0 449 4 0 4 4 0 8 0 procpl 632 966 0 922 5 0 5 5 0 8 1 srpgc 64 4 0 4 1 0 1 1 0 8 1 sockpl 384 584 0 565 6 2 4 4 0 8 2 mcl64k 65536 13 0 0 2 0 2 2 0 8 0 mcl12k 12288 7 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 10 0 0 2 0 2 2 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 286 0 0 35 0 35 35 0 8 0 mtagpl 80 18 0 0 1 0 1 1 0 8 0 mbufpl 256 405 0 0 24 0 24 24 0 8 0 bufpl 280 8946 0 1876 506 0 506 506 0 8 0 anonpl 16 78294 0 60316 97 2 95 95 0 125 17 amapchunkpl 152 3057 0 2907 15 2 13 13 0 158 6 amappl16 192 2637 0 1585 74 13 61 65 0 8 8 amappl15 184 329 0 320 1 0 1 1 0 8 0 amappl14 176 43 0 40 2 1 1 1 0 8 0 amappl12 160 55 0 53 1 0 1 1 0 8 0 amappl11 152 91 0 74 1 0 1 1 0 8 0 amappl10 144 19 0 15 1 0 1 1 0 8 0 amappl9 136 623 0 620 1 0 1 1 0 8 0 amappl8 128 137 0 112 1 0 1 1 0 8 0 amappl7 120 118 0 104 1 0 1 1 0 8 0 amappl6 112 89 0 80 1 0 1 1 0 8 0 amappl5 104 203 0 187 1 0 1 1 0 8 0 amappl4 96 724 0 689 2 1 1 2 0 8 0 amappl3 88 136 0 127 1 0 1 1 0 8 0 amappl2 80 2832 0 2746 4 2 2 3 0 8 0 amappl1 72 20408 0 19942 26 16 10 20 0 8 0 amappl 80 1253 0 1207 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 8 0 0 1 0 1 1 0 8 0 uaddrrnd 24 466 0 449 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 466 0 449 1 0 1 1 0 8 0 vmmpekpl 168 7546 0 7515 2 0 2 2 0 8 0 vmmpepl 168 69020 0 66677 152 14 138 138 0 357 36 vmsppl 368 465 0 449 2 0 2 2 0 8 0 pdppl 4096 939 0 898 7 1 6 6 0 8 0 pvpl 32 234770 0 213494 228 4 224 224 0 265 43 pmappl 232 465 0 449 2 1 1 2 0 8 0 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 200 0 5 6 0 6 6 0 8 0