witness: lock order reversal: 1st 0xfffffd807f004748 vmmaplk (&map->lock) 2nd 0xfffffd806e3f4e68 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(fffffd806e3f4e68,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd806e3f4e68,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd806e3f4e58,81) at rw_enter+0xd4 rrw_enter(fffffd806e3f4e58,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd8062dd4420,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd8062dd4420,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd8066bf3b90,ffff800024fa7168,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd8066bf3b90,3000,ffff800024fa73c0,ffff800024fa7354,0,0) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f004730,20003000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f004730,20003000,20006000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f004730,fffffd806b3b88b8,fffffd8066e21c18,ffff800022f88000,ffffffff81b6d177,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020a99b40,ffff800024fa75b8,ffff800024fa7600) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024fa7680) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024fa7680) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9a1010f4b80, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024fa6de0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022f88000 rax 0xffff8000009f5b00 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0x34e1fd0001204a38 r12 0xfffffd800297b100 r13 0 r14 0xffffffff825f2770 w_lodata+0x4ba00 r15 0xffffffff825fbd50 w_lodata+0x54fe0 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024fa6dd0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=264784 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020a989f8,0xffffffff82659068 process=0xffff800020a9b1b8 user=0xffff800024fa2000, vmspace=0xfffffd807f004730 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 56456 187812 68637 32767 7 0x10 syz-executor.0 56456 111878 68637 32767 3 0x4000090 netio syz-executor.0 *56456 264784 68637 32767 7 0x4000010 syz-executor.0 68637 106551 262 32767 3 0x90 nanosleep syz-executor.0 262 186138 34676 0 3 0x82 wait syz-executor.0 63575 250705 0 0 3 0x14200 bored sosplice 34676 251764 45073 0 3 0x82 thrsleep syz-fuzzer 34676 319567 45073 0 3 0x4000082 thrsleep syz-fuzzer 34676 462278 45073 0 3 0x4000082 thrsleep syz-fuzzer 34676 354844 45073 0 3 0x4000082 thrsleep syz-fuzzer 34676 344484 45073 0 3 0x4000082 thrsleep syz-fuzzer 34676 94360 45073 0 3 0x4000082 thrsleep syz-fuzzer 34676 359243 45073 0 3 0x4000082 thrsleep syz-fuzzer 34676 191528 45073 0 3 0x4000082 kqread syz-fuzzer 34676 261068 45073 0 3 0x4000082 thrsleep syz-fuzzer 34676 522773 45073 0 3 0x4000082 thrsleep syz-fuzzer 45073 186517 30789 0 3 0x10008a pause ksh 30789 477075 26350 0 3 0x92 select sshd 62214 153483 1 0 3 0x100083 ttyin getty 26350 177026 1 0 3 0x80 select sshd 63221 325656 12628 73 3 0x100090 kqread syslogd 12628 52492 1 0 3 0x100082 netio syslogd 3557 14216 1 77 3 0x100090 poll dhclient 21441 254677 1 0 3 0x80 poll dhclient 64297 247057 0 0 3 0x14200 pgzero zerothread 55477 35902 0 0 3 0x14200 aiodoned aiodoned 2905 463857 0 0 3 0x14200 syncer update 9728 193457 0 0 3 0x14200 cleaner cleaner 56363 481431 0 0 3 0x14200 reaper reaper 37076 228428 0 0 3 0x14200 pgdaemon pagedaemon 99773 42458 0 0 3 0x14200 bored crynlk 23386 493522 0 0 3 0x14200 bored crypto 12742 479355 0 0 3 0x14200 bored viomb 12321 228269 0 0 3 0x40014200 acpi0 acpi0 18167 280139 0 0 3 0x40014200 idle1 99340 271947 0 0 3 0x14200 bored softnet 23055 14139 0 0 3 0x14200 bored systqmp 68712 129792 0 0 3 0x14200 bored systq 55097 411571 0 0 3 0x40014200 bored softclock 12495 278276 0 0 3 0x40014200 idle0 76139 509858 0 0 3 0x14200 bored smr 1 264 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 56456 (syz-executor.0) thread 0xffff800020a99b40 (264784) shared rwlock vmmaplk r = 0 (0xfffffd807f004748) #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 9478 6339K 6341K 78643K 10600 0 pcb 13 8K 8K 78643K 13 0 rtable 85 2K 3K 78643K 531 0 ifaddr 32 9K 10K 78643K 90 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 28 0 iov 0 0K 48K 78643K 192 0 mount 1 1K 1K 78643K 1 0 vnodes 1214 76K 76K 78643K 1407 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 6 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 257 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 5 13K 33K 78643K 408 0 sigio 0 0K 0K 78643K 13 0 proc 48 50K 83K 78643K 726 0 subproc 17 1K 2K 78643K 153 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 83 0 in_multi 22 1K 2K 78643K 118 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 78 344K 344K 78643K 78 0 exec 0 0K 1K 78643K 299 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 14K 38K 78643K 2420 0 UVM aobj 86 5K 5K 78643K 93 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 4 0K 0K 78643K 30 0 temp 84 3028K 3094K 78643K 4842 0 kqueue 0 0K 0K 78643K 9 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 21 0 17 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 112 0 110 1 0 1 1 0 8 0 rtentry 112 116 0 82 2 0 2 2 0 8 0 unpcb 120 485 0 471 2 1 1 2 0 8 0 syncache 264 5 0 5 2 1 1 1 0 8 1 tcpqe 32 89 0 89 1 1 0 1 0 8 0 tcpcb 544 237 0 232 1 0 1 1 0 8 0 ipq 40 6 0 6 2 2 0 1 0 8 0 ipqe 40 194 0 194 2 2 0 1 0 8 0 inpcb 280 639 0 631 3 1 2 2 0 8 1 nd6 48 18 0 16 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 517 0 348 14 0 14 14 0 8 0 art_table 32 518 0 348 2 0 2 2 0 8 0 art_node 16 115 0 84 1 0 1 1 0 8 0 sysvmsgpl 40 70 0 36 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 255 0 245 1 0 1 1 0 8 0 shmpl 112 91 0 7 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1883 0 484 46 0 46 46 0 8 0 ffsino 272 1883 0 484 94 0 94 94 0 8 0 nchpl 144 2607 0 1011 60 0 60 60 0 8 0 uvmvnodes 72 2045 0 0 38 0 38 38 0 8 0 vnodes 208 2045 0 0 108 0 108 108 0 8 0 namei 1024 8985 0 8985 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 7420 0 7420 9 8 1 7 0 8 1 plimitpl 152 89 0 82 1 0 1 1 0 8 0 sigapl 432 558 0 545 3 1 2 3 0 8 0 futexpl 56 9636 0 9636 1 0 1 1 0 8 1 knotepl 112 191 0 178 2 1 1 2 0 8 0 kqueuepl 104 203 0 200 1 0 1 1 0 8 0 pipepl 160 1096 0 1079 3 1 2 2 0 8 1 fdescpl 488 559 0 545 3 0 3 3 0 8 1 filepl 152 5612 0 5525 8 2 6 7 0 8 2 lockfpl 104 181 0 178 1 0 1 1 0 8 0 lockfspl 48 69 0 66 1 0 1 1 0 8 0 sessionpl 112 24 0 15 1 0 1 1 0 8 0 pgrppl 48 30 0 21 1 0 1 1 0 8 0 ucredpl 96 958 0 950 1 0 1 1 0 8 0 zombiepl 144 545 0 545 1 0 1 1 0 8 1 processpl 904 576 0 545 4 0 4 4 0 8 0 procpl 632 1381 0 1339 5 0 5 5 0 8 1 srpgc 64 16 0 16 2 1 1 1 0 8 1 sosppl 128 6 0 6 3 3 0 1 0 8 0 sockpl 384 1258 0 1234 9 5 4 7 0 8 1 mcl64k 65536 14 0 0 2 0 2 2 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 7 0 0 1 0 1 1 0 8 0 mcl9k 9216 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 273 0 0 34 0 34 34 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 453 0 0 28 0 28 28 0 8 0 bufpl 280 6922 0 1327 400 0 400 400 0 8 0 anonpl 16 84148 0 72214 77 10 67 76 0 125 4 amapchunkpl 152 4625 0 4495 22 15 7 20 0 158 0 amappl16 192 2772 0 1962 60 13 47 54 0 8 5 amappl15 184 99 0 96 1 0 1 1 0 8 0 amappl14 176 96 0 91 1 0 1 1 0 8 0 amappl13 168 82 0 80 1 0 1 1 0 8 0 amappl12 160 65 0 64 1 0 1 1 0 8 0 amappl11 152 71 0 60 1 0 1 1 0 8 0 amappl10 144 29 0 27 2 1 1 1 0 8 0 amappl9 136 747 0 741 1 0 1 1 0 8 0 amappl8 128 304 0 264 2 0 2 2 0 8 0 amappl7 120 147 0 132 1 0 1 1 0 8 0 amappl6 112 67 0 58 1 0 1 1 0 8 0 amappl5 104 228 0 217 1 0 1 1 0 8 0 amappl4 96 771 0 743 1 0 1 1 0 8 0 amappl3 88 181 0 173 1 0 1 1 0 8 0 amappl2 80 3237 0 3167 3 1 2 3 0 8 0 amappl1 72 23298 0 22872 24 14 10 20 0 8 0 amappl 80 1732 0 1688 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 92 0 7 2 0 2 2 0 8 0 uaddrrnd 24 559 0 545 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 559 0 545 1 0 1 1 0 8 0 vmmpekpl 168 10579 0 10549 2 0 2 2 0 8 0 vmmpepl 168 81942 0 80008 140 15 125 125 0 357 34 vmsppl 368 558 0 545 2 0 2 2 0 8 0 pdppl 4096 1125 0 1090 6 0 6 6 0 8 1 pvpl 32 247991 0 232978 184 15 169 182 0 265 18 pmappl 232 558 0 545 4 2 2 2 0 8 1 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 196 0 2 6 0 6 6 0 8 0