witness: lock order reversal: 1st 0xfffffd807f008a28 vmmaplk (&map->lock) 2nd 0xfffffd80647a7f78 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(fffffd80647a7f78,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd80647a7f78,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd80647a7f68,81) at rw_enter+0xd4 rrw_enter(fffffd80647a7f68,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd8068b4f910,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd8068b4f910,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd80662b9a30,ffff800024d9ab48,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd80662b9a30,0,ffff800024d9ada0,ffff800024d9ad34,0,0) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f008a10,20000000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f008a10,20000000,20003000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f008a10,fffffd806b3b8c38,fffffd806b3b8d88,ffff800022d72000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020ac0290,ffff800024d9af98,ffff800024d9afe0) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024d9b060) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024d9b060) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cc4575b5c0, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024d9a7c0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022d72000 rax 0xffff8000009f21c0 r8 0xffffffff818af532 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xa4cd2cb4869fd844 r12 0xfffffd800297c200 r13 0 r14 0xffffffff825f13c0 w_lodata+0x455a0 r15 0xffffffff82601010 w_lodata+0x551f0 rip 0xffffffff811551c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024d9a7b0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=346785 stat=onproc flags process=10 proc=4000000 pri=79, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac0780,0xffff800020ac1b50 process=0xffff800020a9a720 user=0xffff800024d96000, vmspace=0xfffffd807f008a10 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 41942 175827 38244 32767 2 0x10 syz-executor.1 41942 20775 38244 32767 3 0x4000090 netio syz-executor.1 64101 420213 99844 32767 2 0x10 syz-executor.0 *64101 346785 99844 32767 7 0x4000010 syz-executor.0 64101 149490 99844 32767 7 0x4000010 syz-executor.0 38244 167059 37272 32767 3 0x90 nanosleep syz-executor.1 37272 380714 28195 0 3 0x82 wait syz-executor.1 99844 181123 48703 32767 3 0x90 nanosleep syz-executor.0 48703 388584 28195 0 3 0x82 wait syz-executor.0 82043 117895 0 0 3 0x14200 bored sosplice 28195 370525 88995 0 3 0x82 thrsleep syz-fuzzer 28195 444200 88995 0 3 0x4000082 nanosleep syz-fuzzer 28195 480747 88995 0 3 0x4000082 thrsleep syz-fuzzer 28195 514333 88995 0 3 0x4000082 thrsleep syz-fuzzer 28195 286048 88995 0 3 0x4000082 thrsleep syz-fuzzer 28195 338424 88995 0 3 0x4000082 thrsleep syz-fuzzer 28195 134860 88995 0 3 0x4000082 thrsleep syz-fuzzer 28195 225321 88995 0 3 0x4000082 thrsleep syz-fuzzer 28195 10684 88995 0 3 0x4000082 thrsleep syz-fuzzer 28195 390833 88995 0 3 0x4000082 kqread syz-fuzzer 88995 221445 28739 0 3 0x10008a pause ksh 28739 20478 73832 0 3 0x92 select sshd 8012 97975 1 0 3 0x100083 ttyin getty 73832 462370 1 0 3 0x80 select sshd 2449 133315 15263 73 3 0x100090 kqread syslogd 15263 479596 1 0 3 0x100082 netio syslogd 75165 391491 1 77 3 0x100090 poll dhclient 15755 267466 1 0 3 0x80 poll dhclient 38983 519713 0 0 2 0x14200 zerothread 86317 103665 0 0 3 0x14200 aiodoned aiodoned 44175 435684 0 0 3 0x14200 syncer update 30145 17340 0 0 3 0x14200 cleaner cleaner 93449 15378 0 0 3 0x14200 reaper reaper 52717 450481 0 0 3 0x14200 pgdaemon pagedaemon 94510 276054 0 0 3 0x14200 bored crynlk 85478 126051 0 0 3 0x14200 bored crypto 78277 513922 0 0 3 0x40014200 acpi0 acpi0 60768 208809 0 0 3 0x40014200 idle1 91207 204991 0 0 3 0x14200 bored softnet 70481 127844 0 0 3 0x14200 bored systqmp 59722 256809 0 0 3 0x14200 bored systq 83930 419030 0 0 3 0x40014200 bored softclock 75263 352856 0 0 3 0x40014200 idle0 15616 185030 0 0 3 0x14200 bored smr 1 354612 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 64101 (syz-executor.0) thread 0xffff800020ac0290 (346785) shared rwlock vmmaplk r = 0 (0xfffffd807f008a28) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9486 6334K 6334K 78643K 10986 0 pcb 13 10K 12K 78643K 15 0 rtable 105 3K 3K 78643K 4496 0 ifaddr 39 11K 11K 78643K 771 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 178 0 iov 0 0K 48K 78643K 744 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 3447 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 61 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 695 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 8 25K 33K 78643K 4124 0 sigio 0 0K 0K 78643K 128 0 proc 48 50K 83K 78643K 5144 0 subproc 34 2K 2K 78643K 1768 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 1K 78643K 873 0 in_multi 33 2K 2K 78643K 1269 0 ether_multi 1 0K 0K 78643K 13 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 1875 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 159 24K 40K 78643K 16281 0 UVM aobj 130 4K 4K 78643K 130 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 279 0 NDP 7 0K 0K 78643K 315 0 temp 106 3034K 3122K 78643K 23680 0 kqueue 0 0K 0K 78643K 142 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 64 219 0 213 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 717 0 715 1 0 1 1 0 8 0 rtentry 112 1074 0 1030 2 0 2 2 0 8 0 unpcb 120 4632 0 4617 9 8 1 2 0 8 0 syncache 264 48 0 48 12 12 0 1 0 8 0 sackhl 24 3 0 3 3 3 0 1 0 8 0 tcpqe 32 136 0 136 12 12 0 1 0 8 0 tcpcb 544 2613 0 2606 36 35 1 14 0 8 0 ipq 40 67 0 67 18 18 0 1 0 8 0 ipqe 40 2550 0 2550 18 18 0 1 0 8 0 inpcb 280 5823 0 5813 30 28 2 9 0 8 0 ip6q 72 1 0 1 1 1 0 1 0 8 0 ip6af 40 2 0 2 1 1 0 1 0 8 0 nd6 48 208 0 204 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 4741 0 4526 14 0 14 14 0 8 0 art_table 32 4742 0 4526 2 0 2 2 0 8 0 art_node 16 1073 0 1033 1 0 1 1 0 8 0 sysvmsgpl 40 84 0 47 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 691 0 681 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 5492 0 4079 46 0 46 46 0 8 0 ffsino 272 5492 0 4079 96 1 95 95 0 8 0 nchpl 144 11554 0 9937 61 0 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 56643 0 56643 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 33890 0 33890 31 30 1 4 0 8 1 plimitpl 152 837 0 828 1 0 1 1 0 8 0 sigapl 432 3989 0 3973 7 5 2 3 0 8 0 futexpl 56 90597 0 90597 1 0 1 1 0 8 1 knotepl 112 2785 0 2766 13 12 1 3 0 8 0 kqueuepl 104 3723 0 3721 7 6 1 4 0 8 0 pipepl 160 4128 0 4109 10 8 2 2 0 8 1 fdescpl 488 3990 0 3973 3 0 3 3 0 8 0 filepl 152 44718 0 44615 44 38 6 15 0 8 2 lockfpl 104 931 0 930 1 0 1 1 0 8 0 lockfspl 48 309 0 308 1 0 1 1 0 8 0 sessionpl 112 119 0 109 1 0 1 1 0 8 0 pgrppl 48 185 0 175 1 0 1 1 0 8 0 ucredpl 96 8794 0 8785 1 0 1 1 0 8 0 zombiepl 144 3973 0 3973 1 0 1 1 0 8 1 processpl 904 4006 0 3973 4 0 4 4 0 8 0 procpl 632 10769 0 10724 6 1 5 5 0 8 1 srpgc 64 204 0 204 9 8 1 1 0 8 1 sosppl 128 87 0 87 15 15 0 1 0 8 0 sockpl 384 11285 0 11258 64 59 5 16 0 8 2 mcl64k 65536 21 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 34 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 3 0 3 3 0 8 0 mcl4k 4096 25 0 0 3 0 3 3 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 168 0 0 19 0 19 19 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 789 0 0 33 0 33 33 0 8 0 bufpl 280 16566 0 9500 505 0 505 505 0 8 0 anonpl 16 598046 0 585437 171 103 68 86 0 125 1 amapchunkpl 152 41419 0 41288 82 63 19 19 0 158 13 amappl16 192 20280 0 19405 162 107 55 62 0 8 7 amappl15 184 630 0 624 1 0 1 1 0 8 0 amappl14 176 1166 0 1158 1 0 1 1 0 8 0 amappl13 168 472 0 471 1 0 1 1 0 8 0 amappl12 160 552 0 550 4 3 1 1 0 8 0 amappl11 152 668 0 657 1 0 1 1 0 8 0 amappl10 144 292 0 286 1 0 1 1 0 8 0 amappl9 136 2255 0 2252 1 0 1 1 0 8 0 amappl8 128 1379 0 1316 4 1 3 3 0 8 0 amappl7 120 975 0 956 1 0 1 1 0 8 0 amappl6 112 447 0 434 1 0 1 1 0 8 0 amappl5 104 1488 0 1478 1 0 1 1 0 8 0 amappl4 96 4051 0 4015 2 1 1 2 0 8 0 amappl3 88 1193 0 1177 1 0 1 1 0 8 0 amappl2 80 23636 0 23555 3 1 2 3 0 8 0 amappl1 72 121460 0 120990 32 23 9 20 0 8 0 amappl 80 12844 0 12799 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 64 129 0 0 3 0 3 3 0 8 0 uaddrrnd 24 3990 0 3973 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3990 0 3973 1 0 1 1 0 8 0 vmmpekpl 168 41412 0 41384 2 0 2 2 0 8 0 vmmpepl 168 583363 0 581076 258 116 142 143 0 357 34 vmsppl 368 3989 0 3973 2 0 2 2 0 8 0 pdppl 4096 7987 0 7946 6 0 6 6 0 8 0 pvpl 32 1570466 0 1554521 344 173 171 203 0 265 8 pmappl 232 3989 0 3973 13 12 1 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 229 0 38 6 0 6 6 0 8 0