witness: lock order reversal: 1st 0xfffffd807f008468 vmmaplk (&map->lock) 2nd 0xfffffd806554a098 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(fffffd806554a098,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd806554a098,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd806554a088,81) at rw_enter+0xd4 rrw_enter(fffffd806554a088,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd80701f01a8,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd80701f01a8,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd8067884a28,ffff800024d8f1a8,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd8067884a28,1000,ffff800024d8f400,ffff800024d8f394,0,0) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f008450,20001000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f008450,20001000,20010000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f008450,fffffd807d6945f8,fffffd807d694358,ffff800020b4e000,ffffffff818b1737,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020ac0018,ffff800024d8f5f8,ffff800024d8f640) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024d8f6c0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024d8f6c0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1e0a4ad8120, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024d8ee20 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020b4e000 rax 0xffff8000009f2380 r8 0xffffffff818af532 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0x2227fd923e3505a8 r12 0xfffffd800297c200 r13 0 r14 0xffffffff825f2c80 w_lodata+0x46e60 r15 0xffffffff82601010 w_lodata+0x551f0 rip 0xffffffff811551c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024d8ee10 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=127306 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac0c70,0xffffffff82616060 process=0xffff800020a9a720 user=0xffff800024d8a000, vmspace=0xfffffd807f008450 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 39644 205930 99117 32767 7 0x10 syz-executor.1 39644 399590 99117 32767 3 0x4000090 poll syz-executor.1 *39644 127306 99117 32767 7 0x4000010 syz-executor.1 70576 367459 58384 32767 3 0x90 nanosleep syz-executor.0 58384 161768 82587 0 3 0x82 wait syz-executor.0 99117 204026 87313 32767 3 0x90 nanosleep syz-executor.1 87313 127205 82587 0 3 0x82 wait syz-executor.1 29382 181123 0 0 3 0x14200 bored sosplice 82587 334145 16623 0 3 0x82 thrsleep syz-fuzzer 82587 338260 16623 0 3 0x4000082 thrsleep syz-fuzzer 82587 31553 16623 0 3 0x4000082 thrsleep syz-fuzzer 82587 372673 16623 0 3 0x4000082 thrsleep syz-fuzzer 82587 13877 16623 0 3 0x4000082 thrsleep syz-fuzzer 82587 275952 16623 0 3 0x4000082 thrsleep syz-fuzzer 82587 83692 16623 0 3 0x4000082 thrsleep syz-fuzzer 82587 308975 16623 0 3 0x4000082 thrsleep syz-fuzzer 82587 349332 16623 0 3 0x4000082 thrsleep syz-fuzzer 82587 347321 16623 0 3 0x4000082 thrsleep syz-fuzzer 82587 252 16623 0 3 0x4000082 kqread syz-fuzzer 16623 457780 20303 0 3 0x10008a pause ksh 20303 151021 45748 0 3 0x92 select sshd 80398 418830 1 0 3 0x100083 ttyin getty 45748 193618 1 0 3 0x80 select sshd 67459 38533 89505 73 3 0x100090 kqread syslogd 89505 449354 1 0 3 0x100082 netio syslogd 92552 102948 1 77 3 0x100090 poll dhclient 48573 478307 1 0 3 0x80 poll dhclient 54889 483836 0 0 3 0x14200 pgzero zerothread 21962 9739 0 0 3 0x14200 aiodoned aiodoned 83744 396954 0 0 3 0x14200 syncer update 67305 39121 0 0 3 0x14200 cleaner cleaner 56151 87939 0 0 3 0x14200 reaper reaper 91656 40309 0 0 3 0x14200 pgdaemon pagedaemon 81500 57413 0 0 3 0x14200 bored crynlk 18537 271680 0 0 3 0x14200 bored crypto 63035 384718 0 0 3 0x40014200 acpi0 acpi0 45538 113838 0 0 3 0x40014200 idle1 91161 292669 0 0 3 0x14200 bored softnet 69681 451607 0 0 3 0x14200 bored systqmp 68197 10042 0 0 3 0x14200 bored systq 94455 213007 0 0 3 0x40014200 bored softclock 49235 378467 0 0 3 0x40014200 idle0 91746 415242 0 0 3 0x14200 bored smr 1 523596 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 39644 (syz-executor.1) thread 0xffff800020ac0018 (127306) 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 9485 6334K 6334K 78643K 10905 0 pcb 13 10K 12K 78643K 15 0 rtable 105 3K 3K 78643K 3692 0 ifaddr 39 11K 12K 78643K 634 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 163 0 iov 0 0K 40K 78643K 793 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 3033 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 594 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 1158 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 7 21K 33K 78643K 3421 0 sigio 0 0K 0K 78643K 177 0 proc 48 50K 83K 78643K 4228 0 subproc 34 2K 2K 78643K 1428 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 1K 78643K 725 0 in_multi 33 2K 2K 78643K 1011 0 ether_multi 1 0K 0K 78643K 9 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 150 662K 662K 78643K 150 0 exec 0 0K 1K 78643K 1546 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 147 25K 39K 78643K 14315 0 UVM aobj 130 4K 4K 78643K 134 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 332 0 NDP 7 0K 0K 78643K 255 0 temp 106 3034K 3134K 78643K 20024 0 kqueue 0 0K 1K 78643K 266 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 64 184 0 178 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 652 0 650 1 0 1 1 0 8 0 rtentry 112 879 0 835 2 0 2 2 0 8 0 unpcb 120 3734 0 3721 10 9 1 2 0 8 0 syncache 264 36 0 36 14 13 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 137 0 137 10 10 0 1 0 8 0 tcpcb 544 1837 0 1833 21 20 1 12 0 8 0 ipq 40 66 0 66 16 15 1 1 0 8 1 ipqe 40 2465 0 2465 16 15 1 1 0 8 1 inpcb 280 9083 0 9076 35 33 2 9 0 8 1 nd6 48 168 0 164 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 3873 0 3657 14 0 14 14 0 8 0 art_table 32 3874 0 3657 2 0 2 2 0 8 0 art_node 16 878 0 838 1 0 1 1 0 8 0 sysvmsgpl 40 55 0 15 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 1156 0 1146 1 0 1 1 0 8 0 shmpl 112 132 0 4 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 4784 0 3377 46 0 46 46 0 8 0 ffsino 272 4784 0 3377 95 1 94 95 0 8 0 nchpl 144 9272 0 7655 61 1 60 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 45501 0 45501 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 29195 0 29195 39 36 3 7 0 8 3 plimitpl 152 717 0 708 1 0 1 1 0 8 0 sigapl 432 3346 0 3331 9 7 2 3 0 8 0 futexpl 56 84828 0 84828 3 2 1 1 0 8 1 knotepl 112 2352 0 2333 17 15 2 3 0 8 1 kqueuepl 104 4552 0 4549 10 9 1 4 0 8 0 pipepl 160 4402 0 4381 6 4 2 2 0 8 1 fdescpl 488 3347 0 3331 3 0 3 3 0 8 0 filepl 152 42242 0 42141 52 46 6 12 0 8 2 lockfpl 104 784 0 782 1 0 1 1 0 8 0 lockfspl 48 270 0 268 1 0 1 1 0 8 0 sessionpl 112 99 0 89 1 0 1 1 0 8 0 pgrppl 48 143 0 133 1 0 1 1 0 8 0 ucredpl 96 7717 0 7708 1 0 1 1 0 8 0 zombiepl 144 3331 0 3330 1 0 1 1 0 8 0 processpl 904 3363 0 3330 4 0 4 4 0 8 0 procpl 632 9827 0 9782 6 1 5 5 0 8 0 srpgc 64 164 0 164 18 17 1 1 0 8 1 sosppl 128 73 0 73 20 19 1 1 0 8 1 sockpl 384 13583 0 13560 55 50 5 15 0 8 0 mcl64k 65536 31 0 0 4 0 4 4 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 29 0 0 2 0 2 2 0 8 0 mcl9k 9216 14 0 0 1 0 1 1 0 8 0 mcl8k 8192 18 0 0 3 0 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 168 0 0 20 1 19 20 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 662 0 0 26 1 25 25 0 8 0 bufpl 280 14208 0 7142 506 1 505 506 0 8 0 anonpl 16 566384 0 553534 148 79 69 81 0 125 0 amapchunkpl 152 37808 0 37569 103 90 13 20 0 158 3 amappl16 192 18988 0 18080 181 132 49 58 0 8 0 amappl15 184 585 0 581 1 0 1 1 0 8 0 amappl14 176 902 0 895 1 0 1 1 0 8 0 amappl13 168 210 0 210 10 9 1 1 0 8 1 amappl12 160 380 0 377 2 1 1 1 0 8 0 amappl11 152 642 0 631 1 0 1 1 0 8 0 amappl10 144 535 0 534 1 0 1 1 0 8 0 amappl9 136 1940 0 1934 1 0 1 1 0 8 0 amappl8 128 1142 0 1084 4 1 3 3 0 8 0 amappl7 120 1087 0 1071 1 0 1 1 0 8 0 amappl6 112 465 0 451 1 0 1 1 0 8 0 amappl5 104 1137 0 1126 1 0 1 1 0 8 0 amappl4 96 3672 0 3639 1 0 1 1 0 8 0 amappl3 88 778 0 770 1 0 1 1 0 8 0 amappl2 80 20034 0 19959 3 1 2 3 0 8 0 amappl1 72 103819 0 103370 24 14 10 20 0 8 0 amappl 80 11473 0 11427 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 64 133 0 4 3 0 3 3 0 8 0 uaddrrnd 24 3347 0 3331 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3347 0 3331 1 0 1 1 0 8 0 vmmpekpl 168 40056 0 40023 2 0 2 2 0 8 0 vmmpepl 168 493769 0 491573 302 167 135 143 0 357 30 vmsppl 368 3346 0 3331 2 0 2 2 0 8 0 pdppl 4096 6701 0 6662 6 0 6 6 0 8 0 pvpl 32 1462213 0 1445574 340 177 163 194 0 265 1 pmappl 232 3346 0 3331 21 19 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 209 0 26 6 0 6 6 0 8 0