witness: lock order reversal: 1st 0xfffffd807f0055d8 vmmaplk (&map->lock) 2nd 0xfffffd80645f1700 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{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(fffffd80645f1700,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd80645f1700,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd80645f16f0,81) at rw_enter+0xd4 rrw_enter(fffffd80645f16f0,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd8061e95c38,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd8061e95c38,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd8061d88248,ffff800021bbd0e8,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd8061d88248,0,ffff800021bbd340,ffff800021bbd2d4,0,0) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f0055c0,20002000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f0055c0,20002000,20003000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f0055c0,fffffd8065d8f8a8,fffffd8065d8f9f8,ffff800020ba8000,ffffffff8211d1e7,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020aa0510,ffff800021bbd538,ffff800021bbd580) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800021bbd600) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021bbd600) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf1e09975900, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800021bbcd60 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020ba8000 rax 0xffff800000a0e400 r8 0xffffffff8211afe2 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0x11894b28dc9f4c59 r12 0xfffffd800297c100 r13 0 r14 0xffffffff825fbeb0 w_lodata+0x4c450 r15 0xffffffff82604ba0 w_lodata+0x55140 rip 0xffffffff815de968 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021bbcd50 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=119788 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020aa0020,0xffff800020aa1178 process=0xffff800020aa2728 user=0xffff800021bb8000, vmspace=0xfffffd807f0055c0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 37483 324464 96005 0 2 0 syz-executor.1 92483 140881 7853 0 7 0 syz-executor.0 *92483 119788 7853 0 7 0x4000000 syz-executor.0 42621 39936 0 0 3 0x14200 bored sosplice 96005 105436 7248 0 3 0x82 nanosleep syz-executor.1 7853 227566 7248 0 3 0x82 nanosleep syz-executor.0 7248 100028 63156 0 3 0x82 thrsleep syz-fuzzer 7248 356733 63156 0 3 0x4000082 nanosleep syz-fuzzer 7248 281709 63156 0 3 0x4000082 thrsleep syz-fuzzer 7248 334951 63156 0 3 0x4000082 thrsleep syz-fuzzer 7248 172062 63156 0 3 0x4000082 thrsleep syz-fuzzer 7248 120886 63156 0 3 0x4000082 thrsleep syz-fuzzer 7248 299996 63156 0 3 0x4000082 thrsleep syz-fuzzer 7248 298634 63156 0 3 0x4000082 thrsleep syz-fuzzer 7248 136771 63156 0 3 0x4000082 nanosleep syz-fuzzer 7248 244167 63156 0 3 0x4000082 kqread syz-fuzzer 7248 273585 63156 0 3 0x4000082 thrsleep syz-fuzzer 63156 436409 90929 0 3 0x10008a pause ksh 90929 152132 78908 0 3 0x92 select sshd 81085 143237 1 0 3 0x100083 ttyin getty 78908 223131 1 0 3 0x80 select sshd 20013 252606 22642 74 3 0x100092 bpf pflogd 22642 221320 1 0 3 0x80 netio pflogd 54466 515869 2305 73 3 0x100090 kqread syslogd 2305 118340 1 0 3 0x100082 netio syslogd 31069 85265 1 77 3 0x100090 poll dhclient 45057 243897 1 0 3 0x80 poll dhclient 70412 24282 0 0 2 0x14200 zerothread 78331 513812 0 0 3 0x14200 aiodoned aiodoned 96077 210367 0 0 3 0x14200 syncer update 50922 116722 0 0 3 0x14200 cleaner cleaner 13812 237762 0 0 3 0x14200 reaper reaper 79110 295947 0 0 3 0x14200 pgdaemon pagedaemon 88551 219884 0 0 3 0x14200 bored crynlk 6867 104562 0 0 3 0x14200 bored crypto 89714 396553 0 0 3 0x14200 bored viomb 6364 431651 0 0 3 0x40014200 acpi0 acpi0 70657 361776 0 0 3 0x40014200 idle1 69149 438792 0 0 3 0x14200 bored softnet 51562 249768 0 0 3 0x14200 bored systqmp 87331 89707 0 0 3 0x14200 bored systq 32204 434042 0 0 3 0x40014200 bored softclock 42161 304403 0 0 3 0x40014200 idle0 93586 203152 0 0 3 0x14200 bored smr 1 118442 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 92483 (syz-executor.0) thread 0xffff800020aa0510 (119788) shared rwlock vmmaplk r = 0 (0xfffffd807f0055d8) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9506 6425K 7195K 78643K 11370 0 pcb 13 8K 8K 78643K 62 0 rtable 99 4K 4K 78643K 249 0 ifaddr 65 14K 14K 78643K 77 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1473 0 iov 0 0K 16K 78643K 20 0 mount 1 1K 1K 78643K 1 0 vnodes 1229 77K 77K 78643K 1425 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 3 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 52 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 6 17K 25K 78643K 159 0 sigio 0 0K 0K 78643K 4 0 proc 60 63K 95K 78643K 482 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 48 0 in_multi 59 2K 3K 78643K 76 0 ether_multi 1 0K 0K 78643K 2 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 48 212K 212K 78643K 48 0 exec 0 0K 1K 78643K 211 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 124 23K 32K 78643K 1487 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 44 0 NDP 9 0K 0K 78643K 15 0 temp 124 3030K 3096K 78643K 11350 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 6 0 2 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 27 0 25 1 0 1 1 0 8 0 rtentry 112 49 0 11 2 0 2 2 0 8 0 unpcb 120 86 0 76 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 47 0 47 1 1 0 1 0 8 0 tcpcb 544 74 0 70 1 0 1 1 0 8 0 inpcb 280 387 0 380 2 0 2 2 0 8 1 nd6 48 5 0 2 1 0 1 1 0 8 0 pkpcb 40 5 0 5 1 0 1 1 0 8 1 ppxss 1128 1 0 1 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 40 143 0 143 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 33 0 1 1 0 1 1 0 8 0 pfstkey 112 33 0 1 1 0 1 1 0 8 0 pfstate 328 33 0 1 3 0 3 3 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 255 0 43 14 0 14 14 0 8 0 art_table 32 256 0 43 2 0 2 2 0 8 0 art_node 16 48 0 13 1 0 1 1 0 8 0 sysvmsgpl 40 28 0 15 1 0 1 1 0 8 0 semupl 112 5 0 5 1 0 1 1 0 8 1 semapl 112 50 0 40 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 1614 0 200 46 0 46 46 0 8 0 ffsino 272 1614 0 200 95 0 95 95 0 8 0 nchpl 144 2054 0 432 61 0 61 61 0 8 0 uvmvnodes 72 1841 0 0 34 0 34 34 0 8 0 vnodes 208 1841 0 0 97 0 97 97 0 8 0 namei 1024 5760 0 5760 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 0 1 1 0 8 1 scxspl 192 5974 0 5974 8 4 4 7 0 8 4 plimitpl 152 21 0 13 1 0 1 1 0 8 0 sigapl 432 358 0 342 3 1 2 3 0 8 0 futexpl 56 3650 0 3650 1 0 1 1 0 8 1 knotepl 112 70 0 51 1 0 1 1 0 8 0 kqueuepl 104 36 0 34 1 0 1 1 0 8 0 pipepl 160 216 0 197 2 0 2 2 0 8 1 fdescpl 488 359 0 342 3 0 3 3 0 8 0 filepl 152 2500 0 2397 7 0 7 7 0 8 3 lockfpl 104 45 0 44 1 0 1 1 0 8 0 lockfspl 48 19 0 18 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 20 0 9 1 0 1 1 0 8 0 ucredpl 96 218 0 208 1 0 1 1 0 8 0 zombiepl 144 342 0 342 1 0 1 1 0 8 1 processpl 904 376 0 342 4 0 4 4 0 8 0 procpl 632 699 0 654 5 0 5 5 0 8 0 srpgc 64 2 0 2 1 0 1 1 0 8 1 sosppl 128 2 0 2 1 0 1 1 0 8 1 sockpl 384 512 0 493 5 0 5 5 0 8 3 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 163 0 0 20 0 20 20 0 8 0 mtagpl 80 22 0 0 1 0 1 1 0 8 0 mbufpl 256 313 0 0 20 0 20 20 0 8 0 bufpl 280 6647 0 1340 380 0 380 380 0 8 0 anonpl 16 52534 0 33317 86 1 85 85 0 125 6 amapchunkpl 152 2309 0 2022 14 0 14 14 0 158 2 amappl16 192 1668 0 625 54 0 54 54 0 8 1 amappl15 184 117 0 110 1 0 1 1 0 8 0 amappl14 176 31 0 27 1 0 1 1 0 8 0 amappl13 168 1 0 1 1 1 0 1 0 8 0 amappl12 160 73 0 70 2 1 1 1 0 8 0 amappl11 152 55 0 39 1 0 1 1 0 8 0 amappl10 144 18 0 14 1 0 1 1 0 8 0 amappl9 136 602 0 599 1 0 1 1 0 8 0 amappl8 128 134 0 105 1 0 1 1 0 8 0 amappl7 120 108 0 96 1 0 1 1 0 8 0 amappl6 112 60 0 51 1 0 1 1 0 8 0 amappl5 104 198 0 183 1 0 1 1 0 8 0 amappl4 96 608 0 577 1 0 1 1 0 8 0 amappl3 88 123 0 115 1 0 1 1 0 8 0 amappl2 80 2023 0 1940 3 1 2 3 0 8 0 amappl1 72 18015 0 17563 26 16 10 20 0 8 0 amappl 80 957 0 908 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 24 359 0 342 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 359 0 342 1 0 1 1 0 8 0 vmmpekpl 168 6837 0 6808 2 0 2 2 0 8 0 vmmpepl 168 52017 0 49705 138 13 125 130 0 357 24 vmsppl 368 358 0 342 2 0 2 2 0 8 0 pdppl 4096 725 0 684 6 0 6 6 0 8 0 pvpl 32 170316 0 147838 201 0 201 201 0 265 18 pmappl 232 358 0 342 2 1 1 2 0 8 0 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 175 0 3 5 0 5 5 0 8 0