witness: lock order reversal: 1st 0xfffffd807f004188 vmmaplk (&map->lock) 2nd 0xfffffd8063d73f80 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(fffffd8063d73f80,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd8063d73f80,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd8063d73f70,81) at rw_enter+0xd4 rrw_enter(fffffd8063d73f70,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd80674b7690,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd80674b7690,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd80789c35f8,ffff800024de56e8,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd80789c35f8,0,ffff800024de5940,ffff800024de58d4,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f004170,20002000,2,1) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f004170,20002000,20003000,1) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f004170,fffffd806a618a30,fffffd806a618e20,ffff800022586000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020aa0530,ffff800024de5b38,ffff800024de5b80) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024de5c00) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024de5c00) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc3cfc4a0fe0, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024de5360 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022586000 rax 0xffff8000009fb180 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xb66ea63137294915 r12 0xfffffd800297b100 r13 0 r14 0xffffffff825e41d0 w_lodata+0x3d460 r15 0xffffffff825fbd50 w_lodata+0x54fe0 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024de5350 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=476038 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020aa02b8,0xffffffff82659068 process=0xffff800020aec728 user=0xffff800024de0000, vmspace=0xfffffd807f004170 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 87585 267073 78655 32767 7 0x10 syz-executor.0 87585 140535 78655 32767 3 0x4000090 ttyout syz-executor.0 *87585 476038 78655 32767 7 0x4000010 syz-executor.0 80841 259270 62889 32767 3 0x90 nanosleep syz-executor.1 80841 458053 62889 32767 3 0x4000090 netio syz-executor.1 80841 379332 62889 32767 3 0x4000090 fsleep syz-executor.1 80841 72025 62889 32767 3 0x4000090 fsleep syz-executor.1 62889 232324 60705 32767 3 0x90 nanosleep syz-executor.1 60705 345372 44448 0 3 0x82 wait syz-executor.1 78655 257882 13583 32767 3 0x90 nanosleep syz-executor.0 13583 446082 44448 0 3 0x82 wait syz-executor.0 9384 80274 0 0 3 0x14200 bored sosplice 44448 400594 26657 0 3 0x82 thrsleep syz-fuzzer 44448 297550 26657 0 3 0x4000082 thrsleep syz-fuzzer 44448 404758 26657 0 3 0x4000082 thrsleep syz-fuzzer 44448 471706 26657 0 3 0x4000082 thrsleep syz-fuzzer 44448 105762 26657 0 3 0x4000082 thrsleep syz-fuzzer 44448 106649 26657 0 3 0x4000082 thrsleep syz-fuzzer 44448 452897 26657 0 3 0x4000082 thrsleep syz-fuzzer 44448 9733 26657 0 3 0x4000082 thrsleep syz-fuzzer 44448 200819 26657 0 3 0x4000082 kqread syz-fuzzer 44448 94101 26657 0 3 0x4000082 thrsleep syz-fuzzer 26657 419283 1468 0 3 0x10008a pause ksh 1468 69427 31200 0 3 0x92 select sshd 50101 485611 1 0 3 0x100083 ttyin getty 31200 52059 1 0 3 0x80 select sshd 64909 507116 41928 73 3 0x100090 kqread syslogd 41928 181987 1 0 3 0x100082 netio syslogd 95585 508913 1 77 3 0x100090 poll dhclient 64852 330394 1 0 3 0x80 poll dhclient 62302 308746 0 0 3 0x14200 pgzero zerothread 52293 227666 0 0 3 0x14200 aiodoned aiodoned 52679 260662 0 0 3 0x14200 syncer update 63975 107016 0 0 3 0x14200 cleaner cleaner 59561 258279 0 0 3 0x14200 reaper reaper 93536 443484 0 0 3 0x14200 pgdaemon pagedaemon 76516 288975 0 0 3 0x14200 bored crynlk 67104 514041 0 0 3 0x14200 bored crypto 35086 234854 0 0 3 0x14200 bored viomb 20992 304347 0 0 3 0x40014200 acpi0 acpi0 21367 251988 0 0 3 0x40014200 idle1 65050 179403 0 0 3 0x14200 bored softnet 72103 55314 0 0 3 0x14200 bored systqmp 90703 452443 0 0 3 0x14200 bored systq 34895 48793 0 0 3 0x40014200 bored softclock 6248 118911 0 0 3 0x40014200 idle0 56841 35336 0 0 3 0x14200 bored smr 1 158653 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 87585 (syz-executor.0) thread 0xffff800020aa0530 (476038) shared rwlock vmmaplk r = 0 (0xfffffd807f004188) #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 9495 6343K 6343K 78643K 11658 0 pcb 13 10K 12K 78643K 15 0 rtable 111 3K 3K 78643K 11910 0 ifaddr 39 17K 21K 78643K 1953 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 629 0 iov 0 0K 64K 78643K 3658 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 7957 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 170 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 5914 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 8 25K 33K 78643K 12499 0 sigio 0 0K 0K 78643K 414 0 proc 48 50K 83K 78643K 13122 0 subproc 34 2K 2K 78643K 4590 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 2742 0 in_multi 33 2K 2K 78643K 3325 0 ether_multi 1 0K 0K 78643K 33 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 156 689K 689K 78643K 156 0 exec 0 0K 1K 78643K 5117 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 223 37K 40K 78643K 48473 0 UVM aobj 130 5K 5K 78643K 136 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 1K 78643K 1226 0 NDP 5 0K 0K 78643K 813 0 temp 106 3034K 3193K 78643K 62816 0 kqueue 0 0K 1K 78643K 1478 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 64 595 0 588 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 2255 0 2253 1 0 1 1 0 8 0 rtentry 112 2782 0 2735 2 0 2 2 0 8 0 unpcb 120 15466 0 15440 53 51 2 3 0 8 1 syncache 264 122 0 122 49 48 1 1 0 8 1 sackhl 24 4 0 4 3 3 0 1 0 8 0 tcpqe 32 881 0 881 21 20 1 1 0 8 1 tcpcb 544 9031 0 9026 151 148 3 14 0 8 2 ipq 40 294 0 294 68 68 0 1 0 8 0 ipqe 40 8997 0 8997 68 68 0 1 0 8 0 inpcb 280 41106 0 41084 123 120 3 10 0 8 0 ip6q 72 24 0 24 16 15 1 1 0 8 1 ip6af 40 185 0 185 16 15 1 1 0 8 1 nd6 48 542 0 538 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 12079 0 11832 18 2 16 16 0 8 0 art_table 32 12080 0 11832 3 0 3 3 0 8 0 art_node 16 2781 0 2738 1 0 1 1 0 8 0 sysvmsgpl 40 99 0 59 1 0 1 1 0 8 0 semupl 112 3 0 3 2 2 0 1 0 8 0 semapl 112 5906 0 5896 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 16040 0 14593 47 0 47 47 0 8 0 ffsino 272 16040 0 14593 99 2 97 97 0 8 0 nchpl 144 32526 0 30893 63 2 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 167295 0 167295 7 6 1 2 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 114940 0 114940 125 122 3 7 0 8 3 plimitpl 152 2244 0 2235 1 0 1 1 0 8 0 sigapl 432 11866 0 11850 14 12 2 3 0 8 0 futexpl 56 353270 0 353268 6 5 1 1 0 8 0 knotepl 112 9268 0 9249 49 48 1 4 0 8 0 kqueuepl 104 14089 0 14087 60 59 1 4 0 8 0 pipepl 160 10908 0 10887 49 47 2 3 0 8 1 fdescpl 488 11867 0 11850 3 0 3 3 0 8 0 filepl 152 163205 0 163097 214 208 6 14 0 8 1 lockfpl 104 3964 0 3963 1 0 1 1 0 8 0 lockfspl 48 1306 0 1305 1 0 1 1 0 8 0 sessionpl 112 285 0 275 1 0 1 1 0 8 0 pgrppl 48 532 0 522 1 0 1 1 0 8 0 ucredpl 96 29482 0 29473 1 0 1 1 0 8 0 zombiepl 144 11850 0 11850 2 1 1 1 0 8 1 processpl 904 11884 0 11850 15 11 4 5 0 8 0 procpl 632 35314 0 35266 9 4 5 5 0 8 0 srpgc 64 536 0 536 53 53 0 1 0 8 0 sosppl 128 419 0 419 66 65 1 1 0 8 1 sockpl 384 59347 0 59310 230 224 6 15 0 8 1 mcl64k 65536 76 0 0 5 1 4 4 0 8 0 mcl16k 16384 40 0 0 4 1 3 3 0 8 0 mcl12k 12288 41 0 0 3 1 2 2 0 8 0 mcl9k 9216 81 0 0 5 3 2 2 0 8 0 mcl8k 8192 47 0 0 3 1 2 3 0 8 0 mcl4k 4096 41 0 0 5 2 3 3 0 8 0 mcl2k2 2112 22 0 0 2 0 2 2 0 8 0 mcl2k 2048 216 0 0 21 5 16 21 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1719 0 0 42 4 38 41 0 8 0 bufpl 280 49000 0 41934 506 0 506 506 0 8 0 anonpl 16 2002019 0 1984486 341 262 79 91 0 125 8 amapchunkpl 152 125734 0 125472 281 270 11 19 0 158 0 amappl16 192 69929 0 69052 405 349 56 64 0 8 7 amappl15 184 2360 0 2357 1 0 1 1 0 8 0 amappl14 176 3423 0 3421 1 0 1 1 0 8 0 amappl13 168 1665 0 1663 27 26 1 1 0 8 0 amappl12 160 903 0 894 1 0 1 1 0 8 0 amappl11 152 2052 0 2041 1 0 1 1 0 8 0 amappl10 144 1226 0 1217 1 0 1 1 0 8 0 amappl9 136 5149 0 5143 1 0 1 1 0 8 0 amappl8 128 3638 0 3516 7 2 5 5 0 8 0 amappl7 120 2826 0 2810 1 0 1 1 0 8 0 amappl6 112 1343 0 1320 1 0 1 1 0 8 0 amappl5 104 3541 0 3529 1 0 1 1 0 8 0 amappl4 96 12453 0 12413 13 11 2 2 0 8 0 amappl3 88 2833 0 2826 1 0 1 1 0 8 0 amappl2 80 75917 0 75829 3 1 2 3 0 8 0 amappl1 72 342336 0 341859 24 14 10 20 0 8 0 amappl 80 40236 0 40188 3 1 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 64 135 0 6 3 0 3 3 0 8 0 uaddrrnd 24 11867 0 11850 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 11867 0 11850 1 0 1 1 0 8 0 vmmpekpl 168 116988 0 116957 2 0 2 2 0 8 0 vmmpepl 168 1732725 0 1730343 640 513 127 150 0 357 17 vmsppl 368 11866 0 11850 2 0 2 2 0 8 0 pdppl 4096 23741 0 23700 8 2 6 6 0 8 0 pvpl 32 5020521 0 4998997 842 652 190 217 0 265 16 pmappl 232 11866 0 11850 47 46 1 2 0 8 0 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 387 0 187 9 3 6 7 0 8 0