witness: lock order reversal: 1st 0xfffffd807f004a28 vmmaplk (&map->lock) 2nd 0xfffffd807311d2b8 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(fffffd807311d2b8,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd807311d2b8,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd807311d2a8,81) at rw_enter+0xd4 rrw_enter(fffffd807311d2a8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd8062d95768,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd8062d95768,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd80630b3be8,ffff800024d87728,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd80630b3be8,1000,ffff800024d87980,ffff800024d87914,0,2) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f004a10,20001000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f004a10,20001000,20003000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f004a10,fffffd8066db4778,fffffd8066db4cb8,ffff800022b62000,ffffffff81b6d177,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020a98c70,ffff800024d87b78,ffff800024d87bc0) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024d87c40) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024d87c40) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x66ea6325150, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024d873a0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022b62000 rax 0xffff8000009f5280 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xe8299d1049b4b252 r12 0xfffffd800297b100 r13 0 r14 0xffffffff825f26c0 w_lodata+0x4b950 r15 0xffffffff825fbe00 w_lodata+0x55090 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024d87390 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=189792 stat=onproc flags process=10 proc=4000000 pri=75, usrpri=75, nice=20 forw=0xffffffffffffffff, list=0xffff800020a98508,0xffffffff82659068 process=0xffff800020aa3548 user=0xffff800024d82000, vmspace=0xfffffd807f004a10 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 3916 217364 95382 32767 7 0x10 syz-executor.0 * 3916 189792 95382 32767 7 0x4000010 syz-executor.0 54530 46009 17151 32767 3 0x90 nanosleep syz-executor.1 54530 142113 17151 32767 3 0x4000090 ttyout syz-executor.1 54530 149904 17151 32767 3 0x4000090 fsleep syz-executor.1 54530 357764 17151 32767 3 0x4000090 fsleep syz-executor.1 95382 120361 67202 32767 3 0x90 nanosleep syz-executor.0 67202 97623 40801 0 3 0x82 wait syz-executor.0 17151 187639 93556 32767 3 0x90 nanosleep syz-executor.1 93556 269661 40801 0 3 0x82 wait syz-executor.1 8399 363327 0 0 3 0x14200 bored sosplice 40801 20937 78475 0 3 0x82 thrsleep syz-fuzzer 40801 258193 78475 0 3 0x4000082 nanosleep syz-fuzzer 40801 128168 78475 0 3 0x4000082 thrsleep syz-fuzzer 40801 243302 78475 0 3 0x4000082 nanosleep syz-fuzzer 40801 148048 78475 0 3 0x4000082 thrsleep syz-fuzzer 40801 262505 78475 0 3 0x4000082 thrsleep syz-fuzzer 40801 227971 78475 0 3 0x4000082 thrsleep syz-fuzzer 40801 362169 78475 0 3 0x4000082 thrsleep syz-fuzzer 40801 129782 78475 0 3 0x4000082 thrsleep syz-fuzzer 40801 241829 78475 0 3 0x4000082 kqread syz-fuzzer 78475 277357 24997 0 3 0x10008a pause ksh 24997 96897 82742 0 3 0x92 select sshd 17696 382963 1 0 3 0x100083 ttyin getty 82742 394552 1 0 3 0x80 select sshd 92773 443864 95012 73 3 0x100090 kqread syslogd 95012 505598 1 0 3 0x100082 netio syslogd 42778 485337 1 77 3 0x100090 poll dhclient 44828 505397 1 0 3 0x80 poll dhclient 44906 258173 0 0 3 0x14200 pgzero zerothread 18179 173802 0 0 3 0x14200 aiodoned aiodoned 12276 52816 0 0 3 0x14200 syncer update 70006 261109 0 0 3 0x14200 cleaner cleaner 82283 523879 0 0 3 0x14200 reaper reaper 21867 136221 0 0 3 0x14200 pgdaemon pagedaemon 75511 109327 0 0 3 0x14200 bored crynlk 80775 401008 0 0 3 0x14200 bored crypto 69276 399252 0 0 3 0x14200 bored viomb 10780 183259 0 0 3 0x40014200 acpi0 acpi0 28001 258194 0 0 3 0x40014200 idle1 17904 417378 0 0 3 0x14200 bored softnet 79533 104700 0 0 3 0x14200 bored systqmp 98638 487094 0 0 3 0x14200 bored systq 81223 505551 0 0 3 0x40014200 bored softclock 32782 268172 0 0 3 0x40014200 idle0 57389 343096 0 0 3 0x14200 bored smr 1 361377 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 3916 (syz-executor.0) thread 0xffff800020a98c70 (189792) shared rwlock vmmaplk r = 0 (0xfffffd807f004a28) #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 9483 6341K 6341K 78643K 10621 0 pcb 13 8K 8K 78643K 13 0 rtable 107 3K 3K 78643K 749 0 ifaddr 39 10K 10K 78643K 126 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 39 0 iov 0 0K 28K 78643K 112 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 1497 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 18 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 316 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 8 25K 33K 78643K 523 0 sigio 0 0K 0K 78643K 26 0 proc 48 50K 70K 78643K 934 0 subproc 34 2K 2K 78643K 238 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 113 0 in_multi 33 2K 2K 78643K 196 0 ether_multi 1 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 84 371K 371K 78643K 84 0 exec 0 0K 1K 78643K 384 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 120 23K 24K 78643K 2761 0 UVM aobj 130 4K 4K 78643K 138 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 42 0 NDP 5 0K 0K 78643K 45 0 temp 105 3030K 3111K 78643K 5631 0 kqueue 0 0K 0K 78643K 8 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 35 0 28 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 129 0 127 1 0 1 1 0 8 0 rtentry 112 170 0 125 2 0 2 2 0 8 0 unpcb 120 692 0 680 1 0 1 1 0 8 0 syncache 264 8 0 8 2 2 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 544 325 0 321 4 3 1 2 0 8 0 ipq 40 9 0 9 2 1 1 1 0 8 1 ipqe 40 405 0 405 2 1 1 1 0 8 1 inpcb 280 1310 0 1297 6 3 3 4 0 8 1 nd6 48 28 0 24 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 741 0 525 14 0 14 14 0 8 0 art_table 32 742 0 525 2 0 2 2 0 8 0 art_node 16 169 0 128 1 0 1 1 0 8 0 sysvmsgpl 40 40 0 33 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 314 0 304 1 0 1 1 0 8 0 shmpl 112 136 0 8 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1906 0 499 46 0 46 46 0 8 0 ffsino 272 1906 0 499 94 0 94 94 0 8 0 nchpl 144 2735 0 1130 60 0 60 60 0 8 0 uvmvnodes 72 2153 0 0 40 0 40 40 0 8 0 vnodes 208 2153 0 0 114 0 114 114 0 8 0 namei 1024 9770 0 9770 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 7874 0 7874 9 8 1 7 0 8 1 plimitpl 152 92 0 83 1 0 1 1 0 8 0 sigapl 432 658 0 642 3 1 2 3 0 8 0 futexpl 56 11247 0 11245 1 0 1 1 0 8 0 knotepl 112 304 0 285 2 0 2 2 0 8 1 kqueuepl 104 264 0 262 1 0 1 1 0 8 0 pipepl 160 540 0 519 2 0 2 2 0 8 1 fdescpl 488 659 0 642 3 0 3 3 0 8 0 filepl 152 6330 0 6213 9 2 7 7 0 8 2 lockfpl 104 100 0 97 1 0 1 1 0 8 0 lockfspl 48 41 0 38 1 0 1 1 0 8 0 sessionpl 112 29 0 19 1 0 1 1 0 8 0 pgrppl 48 33 0 22 1 0 1 1 0 8 0 ucredpl 96 1093 0 1084 1 0 1 1 0 8 0 zombiepl 144 642 0 642 1 0 1 1 0 8 1 processpl 904 676 0 642 4 0 4 4 0 8 0 procpl 632 1513 0 1466 5 0 5 5 0 8 1 srpgc 64 24 0 24 2 2 0 1 0 8 0 sosppl 128 16 0 16 2 2 0 1 0 8 0 sockpl 384 2165 0 2143 12 6 6 7 0 8 3 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 5 0 0 1 0 1 1 0 8 0 mcl8k 8192 15 0 0 2 0 2 2 0 8 0 mcl4k 4096 11 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 132 0 0 15 0 15 15 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 564 0 0 33 0 33 33 0 8 0 bufpl 280 7090 0 1326 412 0 412 412 0 8 0 anonpl 16 94780 0 79192 90 25 65 73 0 125 1 amapchunkpl 152 5491 0 5227 18 5 13 13 0 158 2 amappl16 192 3162 0 2312 61 17 44 51 0 8 1 amappl15 184 160 0 157 1 0 1 1 0 8 0 amappl14 176 260 0 252 1 0 1 1 0 8 0 amappl13 168 24 0 24 1 1 0 1 0 8 0 amappl12 160 18 0 17 2 1 1 1 0 8 0 amappl11 152 88 0 76 1 0 1 1 0 8 0 amappl10 144 67 0 66 1 0 1 1 0 8 0 amappl9 136 537 0 534 1 0 1 1 0 8 0 amappl8 128 233 0 198 3 1 2 2 0 8 0 amappl7 120 230 0 215 1 0 1 1 0 8 0 amappl6 112 70 0 63 1 0 1 1 0 8 0 amappl5 104 623 0 611 1 0 1 1 0 8 0 amappl4 96 850 0 820 1 0 1 1 0 8 0 amappl3 88 372 0 363 1 0 1 1 0 8 0 amappl2 80 3576 0 3498 3 1 2 3 0 8 0 amappl1 72 26417 0 25945 24 14 10 20 0 8 0 amappl 80 1942 0 1895 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 64 137 0 8 3 0 3 3 0 8 0 uaddrrnd 24 659 0 642 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 659 0 642 1 0 1 1 0 8 0 vmmpekpl 168 9626 0 9599 2 0 2 2 0 8 0 vmmpepl 168 97623 0 95407 130 12 118 121 0 357 21 vmsppl 368 658 0 642 2 0 2 2 0 8 0 pdppl 4096 1325 0 1284 6 0 6 6 0 8 0 pvpl 32 286951 0 267982 193 27 166 175 0 265 12 pmappl 232 658 0 642 3 2 1 2 0 8 0 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 188 0 5 6 0 6 6 0 8 0