witness: lock order reversal: 1st 0xfffffd806e8b5020 vmmaplk (&map->lock) 2nd 0xfffffd8072bfa700 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(fffffd8072bfa700,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd8072bfa700,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd8072bfa6f0,81) at rw_enter+0xd4 rrw_enter(fffffd8072bfa6f0,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd80676ba1a0,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd80676ba1a0,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd8061900918,ffff800024f83008,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd8061900918,0,ffff800024f83260,ffff800024f831f4,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd806e8b5008,20002000,2,1) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd806e8b5008,20002000,20004000,1) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd806e8b5008,fffffd806e4278c0,fffffd8062ec77a0,ffff80002316c000,ffffffff818b1737,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020a982b0,ffff800024f83458,ffff800024f834a0) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024f83520) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024f83520) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd0002179390, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024f82c80 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff80002316c000 rax 0xffff8000009f2880 r8 0xffffffff818af532 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xbc9b56125270ca2c r12 0xfffffd800297c200 r13 0 r14 0xffffffff825ee920 w_lodata+0x42b00 r15 0xffffffff82600e00 w_lodata+0x54fe0 rip 0xffffffff811551c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024f82c70 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=8382 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020a98a18,0xffffffff82616060 process=0xffff800020a9b1b8 user=0xffff800024f7e000, vmspace=0xfffffd806e8b5008 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 53242 346080 49877 32767 7 0x10 syz-executor.0 53242 444203 49877 32767 3 0x4000090 fsleep syz-executor.0 53242 50249 49877 32767 3 0x4000090 fsleep syz-executor.0 *53242 8382 49877 32767 7 0x4000010 syz-executor.0 49877 518053 28951 32767 3 0x90 nanosleep syz-executor.0 28951 31494 77500 0 3 0x82 wait syz-executor.0 51907 431084 16554 32767 3 0x90 nanosleep syz-executor.1 16554 365224 77500 0 3 0x82 wait syz-executor.1 14959 502119 0 0 3 0x14200 bored sosplice 77500 496663 20427 0 3 0x82 thrsleep syz-fuzzer 77500 134433 20427 0 3 0x4000082 nanosleep syz-fuzzer 77500 426314 20427 0 3 0x4000082 thrsleep syz-fuzzer 77500 503692 20427 0 3 0x4000082 thrsleep syz-fuzzer 77500 42372 20427 0 3 0x4000082 kqread syz-fuzzer 77500 365664 20427 0 3 0x4000082 thrsleep syz-fuzzer 77500 46056 20427 0 3 0x4000082 nanosleep syz-fuzzer 77500 277835 20427 0 3 0x4000082 thrsleep syz-fuzzer 77500 195815 20427 0 3 0x4000082 thrsleep syz-fuzzer 77500 53429 20427 0 3 0x4000082 thrsleep syz-fuzzer 20427 216756 75330 0 3 0x10008a pause ksh 75330 500596 18492 0 3 0x92 select sshd 78606 93363 1 0 3 0x100083 ttyin getty 18492 292150 1 0 3 0x80 select sshd 96533 293042 60709 73 3 0x100090 kqread syslogd 60709 157617 1 0 3 0x100082 netio syslogd 69241 313505 1 77 3 0x100090 poll dhclient 13316 423032 1 0 3 0x80 poll dhclient 76831 159165 0 0 2 0x14200 zerothread 99245 297931 0 0 3 0x14200 aiodoned aiodoned 13453 418059 0 0 3 0x14200 syncer update 41003 251603 0 0 3 0x14200 cleaner cleaner 88665 518607 0 0 3 0x14200 reaper reaper 48709 447867 0 0 3 0x14200 pgdaemon pagedaemon 89989 166746 0 0 3 0x14200 bored crynlk 13923 500190 0 0 3 0x14200 bored crypto 21838 508778 0 0 3 0x40014200 acpi0 acpi0 5478 69990 0 0 3 0x40014200 idle1 14205 60320 0 0 3 0x14200 bored softnet 48976 66087 0 0 3 0x14200 bored systqmp 15212 82581 0 0 3 0x14200 bored systq 34393 364986 0 0 3 0x40014200 bored softclock 31323 387428 0 0 3 0x40014200 idle0 83644 459698 0 0 3 0x14200 bored smr 1 88561 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 53242 (syz-executor.0) thread 0xffff800020a982b0 (8382) shared rwlock vmmaplk r = 0 (0xfffffd806e8b5020) #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 10937 0 pcb 13 8K 8K 78643K 13 0 rtable 105 3K 3K 78643K 4073 0 ifaddr 39 11K 12K 78643K 683 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 192 0 iov 0 0K 32K 78643K 805 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 3307 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 60 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 2282 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 7 21K 33K 78643K 4244 0 sigio 0 0K 0K 78643K 227 0 proc 48 50K 83K 78643K 4640 0 subproc 34 2K 2K 78643K 1564 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 783 0 in_multi 33 2K 2K 78643K 1128 0 ether_multi 1 0K 0K 78643K 7 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 1820 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 156 33K 33K 78643K 17299 0 UVM aobj 130 4K 4K 78643K 132 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 354 0 NDP 5 0K 0K 78643K 279 0 temp 106 3034K 3134K 78643K 22490 0 kqueue 0 0K 0K 78643K 148 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 64 202 0 196 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 902 0 900 1 0 1 1 0 8 0 rtentry 112 961 0 917 2 0 2 2 0 8 0 unpcb 120 5662 0 5654 17 16 1 2 0 8 0 syncache 264 61 0 61 20 19 1 1 0 8 1 sackhl 24 3 0 3 3 3 0 1 0 8 0 tcpqe 32 138 0 138 18 17 1 1 0 8 1 tcpcb 544 2421 0 2416 25 23 2 3 0 8 1 ipq 40 70 0 70 20 20 0 1 0 8 0 ipqe 40 2405 0 2405 20 20 0 1 0 8 0 inpcb 280 13517 0 13507 29 27 2 5 0 8 0 ip6q 72 10 0 10 5 5 0 1 0 8 0 ip6af 40 200 0 200 5 5 0 1 0 8 0 nd6 48 184 0 180 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 4197 0 3982 14 0 14 14 0 8 0 art_table 32 4198 0 3982 2 0 2 2 0 8 0 art_node 16 960 0 920 1 0 1 1 0 8 0 sysvmsgpl 40 49 0 30 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 2280 0 2270 1 0 1 1 0 8 0 shmpl 112 130 0 2 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 5836 0 4426 46 0 46 46 0 8 0 ffsino 272 5836 0 4426 98 3 95 95 0 8 0 nchpl 144 11385 0 9775 60 0 60 60 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 54864 0 54864 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 36399 0 36399 47 45 2 6 0 8 2 plimitpl 152 892 0 883 1 0 1 1 0 8 0 sigapl 432 4145 0 4130 6 4 2 3 0 8 0 futexpl 56 104421 0 104419 2 1 1 1 0 8 0 knotepl 112 2244 0 2225 8 6 2 2 0 8 1 kqueuepl 104 2971 0 2969 4 3 1 3 0 8 0 pipepl 160 4296 0 4277 14 13 1 3 0 8 0 fdescpl 488 4146 0 4130 3 0 3 3 0 8 1 filepl 152 52103 0 52005 55 48 7 12 0 8 3 lockfpl 104 1300 0 1299 1 0 1 1 0 8 0 lockfspl 48 413 0 412 1 0 1 1 0 8 0 sessionpl 112 107 0 97 1 0 1 1 0 8 0 pgrppl 48 161 0 151 1 0 1 1 0 8 0 ucredpl 96 9382 0 9373 1 0 1 1 0 8 0 zombiepl 144 4130 0 4129 1 0 1 1 0 8 0 processpl 904 4162 0 4129 4 0 4 4 0 8 0 procpl 632 12373 0 12328 8 3 5 5 0 8 0 srpgc 64 180 0 180 20 19 1 1 0 8 1 sosppl 128 114 0 114 19 19 0 1 0 8 0 sockpl 384 20244 0 20225 69 64 5 12 0 8 1 mcl64k 65536 26 0 0 3 0 3 3 0 8 0 mcl16k 16384 18 0 0 3 0 3 3 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 15 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 151 0 0 17 0 17 17 0 8 0 mtagpl 80 2 0 0 1 0 1 1 0 8 0 mbufpl 256 690 0 0 22 0 22 22 0 8 0 bufpl 280 17012 0 9946 506 1 505 506 0 8 0 anonpl 16 667957 0 652606 137 68 69 80 0 125 1 amapchunkpl 152 42617 0 42358 88 77 11 13 0 158 0 amappl16 192 23091 0 22244 190 137 53 55 0 8 8 amappl15 184 748 0 745 1 0 1 1 0 8 0 amappl14 176 1335 0 1330 1 0 1 1 0 8 0 amappl13 168 155 0 155 10 10 0 1 0 8 0 amappl12 160 269 0 266 1 0 1 1 0 8 0 amappl11 152 922 0 911 1 0 1 1 0 8 0 amappl10 144 374 0 370 1 0 1 1 0 8 0 amappl9 136 2151 0 2148 1 0 1 1 0 8 0 amappl8 128 1383 0 1323 3 0 3 3 0 8 0 amappl7 120 951 0 933 1 0 1 1 0 8 0 amappl6 112 692 0 679 1 0 1 1 0 8 0 amappl5 104 1118 0 1105 1 0 1 1 0 8 0 amappl4 96 4165 0 4131 1 0 1 1 0 8 0 amappl3 88 1361 0 1352 1 0 1 1 0 8 0 amappl2 80 26019 0 25944 3 1 2 3 0 8 0 amappl1 72 125294 0 124834 24 14 10 20 0 8 0 amappl 80 14198 0 14150 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 64 131 0 2 3 0 3 3 0 8 0 uaddrrnd 24 4146 0 4130 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4146 0 4130 1 0 1 1 0 8 0 vmmpekpl 168 45679 0 45652 2 0 2 2 0 8 0 vmmpepl 168 598015 0 595865 318 193 125 140 0 357 24 vmsppl 368 4145 0 4130 2 0 2 2 0 8 0 pdppl 4096 8299 0 8260 6 0 6 6 0 8 1 pvpl 32 1693498 0 1674386 345 178 167 193 0 265 5 pmappl 232 4145 0 4130 16 14 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 207 0 28 6 0 6 6 0 8 0