witness: lock order reversal: 1st 0xfffffd807f0048b8 vmmaplk (&map->lock) 2nd 0xfffffd8063fb82b8 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(fffffd8063fb82b8,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd8063fb82b8,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd8063fb82a8,81) at rw_enter+0xd4 rrw_enter(fffffd8063fb82a8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd806141bd10,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd806141bd10,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd807de1b4c8,ffff800022d6ea38,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd807de1b4c8,3000,ffff800022d6ec90,ffff800022d6ec24,0,0) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f0048a0,20003000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f0048a0,20003000,20007000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f0048a0,fffffd80629927a0,fffffd8062992998,ffff800020b50000,ffffffff81b6d177,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020acc030,ffff800022d6ee88,ffff800022d6eed0) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800022d6ef50) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022d6ef50) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6edd2011a0, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800022d6e6b0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020b50000 rax 0xffff8000009fbf00 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xdfb6e423f3a751cf r12 0xfffffd800297b100 r13 0 r14 0xffffffff825e7820 w_lodata+0x40ab0 r15 0xffffffff825fbeb0 w_lodata+0x55140 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022d6e6a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=103942 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020accf00,0xffff800020accc98 process=0xffff800020a9b8c8 user=0xffff800022d6a000, vmspace=0xfffffd807f0048a0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 38420 366575 6575 32767 7 0x10 syz-executor.0 *38420 103942 6575 32767 7 0x4000010 syz-executor.0 38420 35358 6575 32767 2 0x4000090 syz-executor.0 29337 232294 7592 32767 3 0x90 nanosleep syz-executor.1 29337 1954 7592 32767 3 0x4000090 fsleep syz-executor.1 29337 470734 7592 32767 3 0x4000090 lockf syz-executor.1 6575 115243 88262 32767 3 0x90 nanosleep syz-executor.0 88262 48637 12414 0 3 0x82 wait syz-executor.0 7592 351698 73459 32767 3 0x90 nanosleep syz-executor.1 73459 120608 12414 0 3 0x82 wait syz-executor.1 89558 506282 0 0 3 0x14200 bored sosplice 12414 272874 37125 0 3 0x82 thrsleep syz-fuzzer 12414 331932 37125 0 3 0x4000082 thrsleep syz-fuzzer 12414 31011 37125 0 3 0x4000082 thrsleep syz-fuzzer 12414 448304 37125 0 3 0x4000082 kqread syz-fuzzer 12414 365648 37125 0 3 0x4000082 thrsleep syz-fuzzer 12414 189953 37125 0 3 0x4000082 thrsleep syz-fuzzer 12414 483363 37125 0 3 0x4000082 thrsleep syz-fuzzer 12414 521056 37125 0 3 0x4000082 thrsleep syz-fuzzer 12414 252143 37125 0 3 0x4000082 thrsleep syz-fuzzer 12414 22907 37125 0 3 0x4000082 thrsleep syz-fuzzer 37125 48170 90562 0 3 0x10008a pause ksh 90562 510795 31176 0 3 0x92 select sshd 46031 464983 1 0 3 0x100083 ttyin getty 31176 3042 1 0 3 0x80 select sshd 38889 203385 78434 73 3 0x100090 kqread syslogd 78434 365937 1 0 3 0x100082 netio syslogd 39878 156049 1 77 3 0x100090 poll dhclient 88068 80779 1 0 3 0x80 poll dhclient 36473 100372 0 0 3 0x14200 pgzero zerothread 50334 381376 0 0 3 0x14200 aiodoned aiodoned 22079 192015 0 0 3 0x14200 syncer update 65116 200495 0 0 3 0x14200 cleaner cleaner 80832 117256 0 0 3 0x14200 reaper reaper 13313 172430 0 0 3 0x14200 pgdaemon pagedaemon 99850 90969 0 0 3 0x14200 bored crynlk 17577 458333 0 0 3 0x14200 bored crypto 12654 269939 0 0 3 0x14200 bored viomb 27488 143974 0 0 3 0x40014200 acpi0 acpi0 27005 468398 0 0 3 0x40014200 idle1 32705 54882 0 0 3 0x14200 bored softnet 56322 38984 0 0 3 0x14200 bored systqmp 46515 243810 0 0 3 0x14200 bored systq 82638 324114 0 0 3 0x40014200 bored softclock 32169 479117 0 0 3 0x40014200 idle0 47561 503596 0 0 3 0x14200 bored smr 1 503956 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 38420 (syz-executor.0) thread 0xffff800020acc030 (103942) shared rwlock vmmaplk r = 0 (0xfffffd807f0048b8) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9497 6343K 6343K 78643K 11120 0 pcb 13 10K 12K 78643K 15 0 rtable 105 3K 3K 78643K 5908 0 ifaddr 39 13K 15K 78643K 989 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 358 0 iov 0 0K 68K 78643K 1181 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 5352 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 111 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 2662 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 8 25K 33K 78643K 6078 0 sigio 0 0K 0K 78643K 247 0 proc 48 50K 83K 78643K 6752 0 subproc 34 2K 2K 78643K 2295 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 1K 78643K 3836 0 in_multi 33 2K 2K 78643K 1937 0 ether_multi 1 0K 0K 78643K 18 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 168 742K 742K 78643K 168 0 exec 0 0K 1K 78643K 2576 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 186 26K 40K 78643K 24355 0 UVM aobj 130 7K 7K 78643K 140 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 1K 78643K 799 0 NDP 5 0K 0K 78643K 408 0 temp 106 3034K 3173K 78643K 33815 0 kqueue 0 0K 2K 78643K 1907 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 64 294 0 288 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 1218 0 1216 1 0 1 1 0 8 0 rtentry 112 1397 0 1353 2 0 2 2 0 8 0 unpcb 120 9038 0 9020 21 19 2 3 0 8 1 syncache 264 45 0 45 16 16 0 1 0 8 0 tcpqe 32 316 0 316 13 13 0 1 0 8 0 tcpcb 544 5673 0 5666 94 92 2 15 0 8 1 ipq 40 100 0 100 23 23 0 1 0 8 0 ipqe 40 3516 0 3516 23 23 0 1 0 8 0 inpcb 280 14958 0 14948 72 68 4 10 0 8 3 nd6 48 270 0 266 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 6071 0 5855 14 0 14 14 0 8 0 art_table 32 6072 0 5855 2 0 2 2 0 8 0 art_node 16 1396 0 1356 1 0 1 1 0 8 0 sysvmsgpl 40 33 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 2658 0 2648 1 0 1 1 0 8 0 shmpl 112 138 0 10 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 9091 0 7668 47 1 46 47 0 8 0 ffsino 272 9091 0 7668 97 1 96 96 0 8 0 nchpl 144 17087 0 15471 62 1 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 99483 0 99483 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 50509 0 50509 52 50 2 4 0 8 2 plimitpl 152 1146 0 1137 1 0 1 1 0 8 0 sigapl 432 5850 0 5834 7 5 2 3 0 8 0 futexpl 56 189447 0 189446 1 0 1 1 0 8 0 knotepl 112 6238 0 6219 32 29 3 3 0 8 2 kqueuepl 104 13336 0 13333 47 46 1 4 0 8 0 pipepl 160 5924 0 5902 19 17 2 3 0 8 1 fdescpl 488 5851 0 5834 3 0 3 3 0 8 0 filepl 152 96163 0 96059 123 112 11 14 0 8 7 lockfpl 104 1873 0 1869 1 0 1 1 0 8 0 lockfspl 48 590 0 587 1 0 1 1 0 8 0 sessionpl 112 150 0 140 1 0 1 1 0 8 0 pgrppl 48 217 0 207 1 0 1 1 0 8 0 ucredpl 96 24361 0 24352 1 0 1 1 0 8 0 zombiepl 144 5834 0 5834 1 0 1 1 0 8 1 processpl 904 5868 0 5834 9 5 4 5 0 8 0 procpl 632 17422 0 17375 7 2 5 6 0 8 0 srpgc 64 266 0 266 22 21 1 1 0 8 1 sosppl 128 195 0 195 25 24 1 1 0 8 1 sockpl 384 25409 0 25379 138 126 12 15 0 8 6 mcl64k 65536 34 0 0 4 1 3 4 0 8 0 mcl16k 16384 41 0 0 5 2 3 3 0 8 0 mcl12k 12288 44 0 0 2 0 2 2 0 8 0 mcl9k 9216 33 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 13 0 0 1 0 1 1 0 8 0 mcl2k 2048 220 0 0 24 5 19 24 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 812 0 0 23 0 23 23 0 8 0 bufpl 280 21388 0 14322 505 0 505 505 0 8 0 anonpl 16 884996 0 871333 209 134 75 86 0 125 5 amapchunkpl 152 61002 0 60866 129 121 8 19 0 158 0 amappl16 192 29560 0 28665 248 194 54 63 0 8 8 amappl15 184 1136 0 1127 1 0 1 1 0 8 0 amappl14 176 1806 0 1804 1 0 1 1 0 8 0 amappl13 168 532 0 532 14 14 0 1 0 8 0 amappl12 160 820 0 819 2 1 1 1 0 8 0 amappl11 152 883 0 867 1 0 1 1 0 8 0 amappl10 144 528 0 526 1 0 1 1 0 8 0 amappl9 136 2780 0 2776 1 0 1 1 0 8 0 amappl8 128 1860 0 1781 5 2 3 3 0 8 0 amappl7 120 1366 0 1351 1 0 1 1 0 8 0 amappl6 112 597 0 578 1 0 1 1 0 8 0 amappl5 104 2084 0 2075 1 0 1 1 0 8 0 amappl4 96 6240 0 6203 1 0 1 1 0 8 0 amappl3 88 1481 0 1472 1 0 1 1 0 8 0 amappl2 80 36566 0 36485 3 1 2 3 0 8 0 amappl1 72 173712 0 173232 24 14 10 20 0 8 0 amappl 80 19980 0 19932 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 64 139 0 10 3 0 3 3 0 8 0 uaddrrnd 24 5851 0 5834 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5851 0 5834 1 0 1 1 0 8 0 vmmpekpl 168 62237 0 62206 2 0 2 2 0 8 0 vmmpepl 168 847009 0 844677 300 171 129 137 0 357 25 vmsppl 368 5850 0 5834 2 0 2 2 0 8 0 pdppl 4096 11709 0 11668 6 0 6 6 0 8 0 pvpl 32 2313272 0 2295687 488 306 182 202 0 265 19 pmappl 232 5850 0 5834 19 18 1 2 0 8 0 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 293 0 109 6 0 6 6 0 8 0