witness: lock order reversal: 1st 0xfffffd807f008468 vmmaplk (&map->lock) 2nd 0xfffffd806b496c58 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(fffffd806b496c58,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd806b496c58,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd806b496c48,81) at rw_enter+0xd4 rrw_enter(fffffd806b496c48,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd8062e1ad08,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd8062e1ad08,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd806260e840,ffff800020b5cf28,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd806260e840,0,ffff800020b5d180,ffff800020b5d114,0,0) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f008450,20000000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f008450,20000000,20003000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f008450,fffffd8066ecee08,fffffd8066ec7ba0,ffff800020b60000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020ac1160,ffff800020b5d378,ffff800020b5d3c0) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800020b5d440) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020b5d440) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf8f379835f0, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020b5cba0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020b60000 rax 0xffff8000009f8000 r8 0xffffffff818af532 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0x2ebc6cc147686efd r12 0xfffffd800297c200 r13 0 r14 0xffffffff825f74b0 w_lodata+0x4b690 r15 0xffffffff82600f60 w_lodata+0x55140 rip 0xffffffff811551c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b5cb90 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=24744 stat=onproc flags process=10 proc=4000000 pri=76, usrpri=76, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac0508,0xffff800020ac02a0 process=0xffff800020a9b8c8 user=0xffff800020b58000, vmspace=0xfffffd807f008450 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 27758 244254 87978 32767 7 0x10 syz-executor.0 *27758 24744 87978 32767 7 0x4000010 syz-executor.0 27758 303047 87978 32767 3 0x4000090 fsleep syz-executor.0 87978 187797 81190 32767 3 0x90 nanosleep syz-executor.0 81190 12421 88573 0 3 0x82 wait syz-executor.0 66532 111162 0 0 3 0x14200 bored sosplice 88573 472387 77070 0 3 0x82 thrsleep syz-fuzzer 88573 62273 77070 0 3 0x4000082 thrsleep syz-fuzzer 88573 176696 77070 0 3 0x4000082 thrsleep syz-fuzzer 88573 2091 77070 0 3 0x4000082 thrsleep syz-fuzzer 88573 127729 77070 0 3 0x4000082 thrsleep syz-fuzzer 88573 315920 77070 0 3 0x4000082 kqread syz-fuzzer 88573 281473 77070 0 3 0x4000082 thrsleep syz-fuzzer 88573 175392 77070 0 3 0x4000082 thrsleep syz-fuzzer 88573 62454 77070 0 3 0x4000082 thrsleep syz-fuzzer 88573 260745 77070 0 3 0x4000082 thrsleep syz-fuzzer 88573 215438 77070 0 3 0x4000082 thrsleep syz-fuzzer 77070 461206 74062 0 3 0x10008a pause ksh 74062 26287 94344 0 3 0x92 select sshd 1134 319339 1 0 3 0x100083 ttyin getty 94344 112564 1 0 3 0x80 select sshd 49249 373837 13522 73 3 0x100090 kqread syslogd 13522 265926 1 0 3 0x100082 netio syslogd 33569 6459 1 77 3 0x100090 poll dhclient 90852 207404 1 0 3 0x80 poll dhclient 41601 268344 0 0 3 0x14200 pgzero zerothread 52999 480868 0 0 3 0x14200 aiodoned aiodoned 64964 203209 0 0 3 0x14200 syncer update 41055 313188 0 0 3 0x14200 cleaner cleaner 83831 129962 0 0 3 0x14200 reaper reaper 87950 134431 0 0 3 0x14200 pgdaemon pagedaemon 32394 524076 0 0 3 0x14200 bored crynlk 77903 176707 0 0 3 0x14200 bored crypto 86680 426323 0 0 3 0x40014200 acpi0 acpi0 60848 358599 0 0 3 0x40014200 idle1 38880 70316 0 0 3 0x14200 bored softnet 44545 509920 0 0 3 0x14200 bored systqmp 572 193745 0 0 3 0x14200 bored systq 12672 120169 0 0 3 0x40014200 bored softclock 12827 268525 0 0 3 0x40014200 idle0 27687 293260 0 0 3 0x14200 bored smr 1 175879 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 27758 (syz-executor.0) thread 0xffff800020ac1160 (24744) shared rwlock vmmaplk r = 0 (0xfffffd807f008468) #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 (0xffffffff82660f10) #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 9468 6330K 6332K 78643K 10583 0 pcb 13 8K 8K 78643K 13 0 rtable 85 2K 3K 78643K 418 0 ifaddr 32 9K 10K 78643K 75 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 34 0 iov 0 0K 24K 78643K 65 0 mount 1 1K 1K 78643K 1 0 vnodes 1214 76K 76K 78643K 1343 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 10 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 252 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 5 13K 33K 78643K 361 0 sigio 0 0K 0K 78643K 16 0 proc 48 50K 83K 78643K 621 0 subproc 17 1K 2K 78643K 119 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 62 0 in_multi 22 1K 2K 78643K 100 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 72 318K 318K 78643K 72 0 exec 0 0K 1K 78643K 296 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 116 14K 24K 78643K 2267 0 UVM aobj 70 3K 3K 78643K 76 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 49 0 NDP 4 0K 0K 78643K 24 0 temp 84 3028K 3096K 78643K 4536 0 kqueue 0 0K 0K 78643K 10 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 16 0 12 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 129 0 127 1 0 1 1 0 8 0 rtentry 112 95 0 61 2 0 2 2 0 8 0 unpcb 120 394 0 382 1 0 1 1 0 8 0 syncache 264 13 0 13 3 3 0 1 0 8 0 tcpqe 32 4 0 4 2 2 0 1 0 8 0 tcpcb 544 320 0 314 4 2 2 2 0 8 1 ipq 40 9 0 9 3 2 1 1 0 8 1 ipqe 40 329 0 329 3 2 1 1 0 8 1 inpcb 280 751 0 742 4 1 3 3 0 8 2 nd6 48 14 0 12 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 428 0 258 14 0 14 14 0 8 0 art_table 32 429 0 258 2 0 2 2 0 8 0 art_node 16 94 0 63 1 0 1 1 0 8 0 sysvmsgpl 40 41 0 24 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 248 0 238 1 0 1 1 0 8 0 shmpl 112 74 0 6 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1810 0 412 46 0 46 46 0 8 0 ffsino 272 1810 0 412 94 0 94 94 0 8 0 nchpl 144 2476 0 881 60 0 60 60 0 8 0 uvmvnodes 72 1938 0 0 36 0 36 36 0 8 0 vnodes 208 1938 0 0 102 0 102 102 0 8 0 namei 1024 7691 0 7691 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 7298 0 7298 6 5 1 3 0 8 1 plimitpl 152 78 0 71 1 0 1 1 0 8 0 sigapl 432 517 0 504 3 1 2 3 0 8 0 futexpl 56 11102 0 11101 1 0 1 1 0 8 0 knotepl 112 217 0 204 2 1 1 2 0 8 0 kqueuepl 104 658 0 656 1 0 1 1 0 8 0 pipepl 160 488 0 475 3 1 2 2 0 8 1 fdescpl 488 518 0 504 3 0 3 3 0 8 1 filepl 152 5007 0 4930 7 1 6 7 0 8 2 lockfpl 104 121 0 120 1 0 1 1 0 8 0 lockfspl 48 44 0 43 1 0 1 1 0 8 0 sessionpl 112 22 0 13 1 0 1 1 0 8 0 pgrppl 48 28 0 19 1 0 1 1 0 8 0 ucredpl 96 673 0 665 1 0 1 1 0 8 0 zombiepl 144 504 0 504 1 0 1 1 0 8 1 processpl 904 534 0 504 4 0 4 4 0 8 0 procpl 632 1324 0 1282 5 0 5 5 0 8 1 srpgc 64 12 0 12 4 3 1 1 0 8 1 sosppl 128 13 0 13 2 1 1 1 0 8 1 sockpl 384 1294 0 1271 8 3 5 6 0 8 2 mcl64k 65536 16 0 0 2 0 2 2 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 12 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 140 0 0 17 0 17 17 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 343 0 0 20 0 20 20 0 8 0 bufpl 280 6981 0 1326 404 0 404 404 0 8 0 anonpl 16 81767 0 69761 81 8 73 81 0 125 6 amapchunkpl 152 4039 0 3914 14 7 7 13 0 158 0 amappl16 192 2391 0 1497 57 10 47 57 0 8 1 amappl15 184 195 0 191 1 0 1 1 0 8 0 amappl14 176 131 0 125 1 0 1 1 0 8 0 amappl13 168 12 0 12 2 2 0 1 0 8 0 amappl12 160 13 0 11 2 1 1 1 0 8 0 amappl11 152 68 0 55 1 0 1 1 0 8 0 amappl10 144 97 0 95 1 0 1 1 0 8 0 amappl9 136 666 0 664 1 0 1 1 0 8 0 amappl8 128 213 0 176 2 0 2 2 0 8 0 amappl7 120 209 0 195 1 0 1 1 0 8 0 amappl6 112 57 0 50 1 0 1 1 0 8 0 amappl5 104 173 0 163 1 0 1 1 0 8 0 amappl4 96 755 0 724 1 0 1 1 0 8 0 amappl3 88 172 0 163 1 0 1 1 0 8 0 amappl2 80 3040 0 2975 3 1 2 3 0 8 0 amappl1 72 22522 0 22086 24 14 10 20 0 8 0 amappl 80 1639 0 1599 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 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 75 0 6 2 0 2 2 0 8 0 uaddrrnd 24 518 0 504 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 518 0 504 1 0 1 1 0 8 0 vmmpekpl 168 8823 0 8793 2 0 2 2 0 8 0 vmmpepl 168 76118 0 74091 138 14 124 130 0 357 30 vmsppl 368 517 0 504 2 0 2 2 0 8 0 pdppl 4096 1043 0 1008 6 0 6 6 0 8 1 pvpl 32 243631 0 228524 197 8 189 197 0 265 31 pmappl 232 517 0 504 3 2 1 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 174 0 4 5 0 5 5 0 8 0