witness: lock order reversal: 1st 0xfffffd807f004018 vmmaplk (&map->lock) 2nd 0xfffffd80670fd708 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(fffffd80670fd708,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd80670fd708,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd80670fd6f8,81) at rw_enter+0xd4 rrw_enter(fffffd80670fd6f8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd807d0b58f0,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd807d0b58f0,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd8070fb21b8,ffff800024fd19e8,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd8070fb21b8,0,ffff800024fd1c40,ffff800024fd1bd4,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f004000,20002000,2,1) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f004000,20002000,20003000,1) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f004000,fffffd8068554248,fffffd8068554638,ffff800022b7c000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020a98290,ffff800024fd1e38,ffff800024fd1e80) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024fd1f00) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024fd1f00) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd61d8c63910, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024fd1660 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022b7c000 rax 0xffff800000a00200 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0x89719520c214d8b5 r12 0xfffffd800297b100 r13 0 r14 0xffffffff825eafd0 w_lodata+0x44260 r15 0xffffffff825fbd50 w_lodata+0x54fe0 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024fd1650 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=499875 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020a989f8,0xffff800020a98790 process=0xffff800020aa23a0 user=0xffff800024fcc000, vmspace=0xfffffd807f004000 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 10865 511520 93319 32767 2 0x10 syz-executor.1 *10865 499875 93319 32767 7 0x4000010 syz-executor.1 10865 344666 93319 32767 3 0x4000090 fsleep syz-executor.1 93319 504556 26049 32767 3 0x90 nanosleep syz-executor.1 26049 310749 13303 0 3 0x82 wait syz-executor.1 7575 194273 39475 32767 3 0x90 nanosleep syz-executor.0 39475 457060 13303 0 3 0x82 wait syz-executor.0 40085 487055 0 0 3 0x14200 bored sosplice 13303 52543 76185 0 3 0x82 thrsleep syz-fuzzer 13303 355934 76185 0 3 0x4000082 thrsleep syz-fuzzer 13303 380385 76185 0 3 0x4000082 thrsleep syz-fuzzer 13303 393572 76185 0 3 0x4000082 thrsleep syz-fuzzer 13303 448310 76185 0 3 0x4000082 thrsleep syz-fuzzer 13303 419305 76185 0 3 0x4000082 thrsleep syz-fuzzer 13303 356365 76185 0 3 0x4000082 thrsleep syz-fuzzer 13303 470896 76185 0 3 0x4000082 thrsleep syz-fuzzer 13303 114484 76185 0 3 0x4000082 thrsleep syz-fuzzer 13303 242662 76185 0 3 0x4000082 kqread syz-fuzzer 13303 140680 76185 0 3 0x4000082 thrsleep syz-fuzzer 76185 349862 80826 0 3 0x10008a pause ksh 80826 117092 54414 0 3 0x92 select sshd 27549 484306 1 0 3 0x100083 ttyin getty 54414 270119 1 0 3 0x80 select sshd 20673 509018 52277 73 3 0x100090 kqread syslogd 52277 413130 1 0 3 0x100082 netio syslogd 82581 144933 1 77 3 0x100090 poll dhclient 58005 293307 1 0 3 0x80 poll dhclient 67805 111914 0 0 2 0x14200 zerothread 86641 372051 0 0 3 0x14200 aiodoned aiodoned 5311 242548 0 0 3 0x14200 syncer update 10644 181212 0 0 3 0x14200 cleaner cleaner 62095 481318 0 0 7 0x14200 reaper 26524 311677 0 0 3 0x14200 pgdaemon pagedaemon 20239 208181 0 0 3 0x14200 bored crynlk 8082 70823 0 0 3 0x14200 bored crypto 70758 163803 0 0 3 0x14200 bored viomb 8714 27109 0 0 3 0x40014200 acpi0 acpi0 9562 10991 0 0 3 0x40014200 idle1 53537 450698 0 0 3 0x14200 bored softnet 28929 478833 0 0 3 0x14200 bored systqmp 7918 90573 0 0 3 0x14200 bored systq 38932 34635 0 0 3 0x40014200 bored softclock 97291 166061 0 0 3 0x40014200 idle0 57215 244469 0 0 3 0x14200 bored smr 1 55481 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 10865 (syz-executor.1) thread 0xffff800020a98290 (499875) shared rwlock vmmaplk r = 0 (0xfffffd807f004018) #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 9494 6343K 6343K 78643K 11001 0 pcb 13 10K 12K 78643K 15 0 rtable 105 3K 3K 78643K 4763 0 ifaddr 39 11K 12K 78643K 792 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 197 0 iov 0 0K 64K 78643K 940 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 3679 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 53 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 2575 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 7 21K 33K 78643K 4238 0 sigio 0 0K 0K 78643K 77 0 proc 48 50K 83K 78643K 5178 0 subproc 34 2K 2K 78643K 1802 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 1K 78643K 839 0 in_multi 33 2K 2K 78643K 1291 0 ether_multi 1 0K 0K 78643K 14 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 1972 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 164 33K 39K 78643K 16707 0 UVM aobj 130 6K 6K 78643K 135 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 298 0 NDP 5 0K 0K 78643K 321 0 temp 106 3034K 3117K 78643K 23843 0 kqueue 0 0K 0K 78643K 60 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 64 229 0 223 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 1208 0 1206 1 0 1 1 0 8 0 rtentry 112 1100 0 1056 2 0 2 2 0 8 0 unpcb 120 4468 0 4453 15 13 2 2 0 8 1 syncache 264 36 0 36 17 16 1 1 0 8 1 sackhl 24 5 0 5 3 3 0 1 0 8 0 tcpqe 32 454 0 454 12 12 0 1 0 8 0 tcpcb 544 2800 0 2795 38 37 1 14 0 8 0 ipq 40 75 0 75 19 18 1 1 0 8 1 ipqe 40 2070 0 2070 19 18 1 1 0 8 1 inpcb 280 6791 0 6777 33 30 3 10 0 8 1 ip6q 72 3 0 3 2 2 0 1 0 8 0 ip6af 40 9 0 9 2 2 0 1 0 8 0 nd6 48 212 0 208 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 4849 0 4634 17 3 14 14 0 8 0 art_table 32 4850 0 4634 2 0 2 2 0 8 0 art_node 16 1099 0 1059 1 0 1 1 0 8 0 sysvmsgpl 40 63 0 27 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 2569 0 2559 1 0 1 1 0 8 0 shmpl 112 133 0 5 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 5672 0 4248 48 1 47 47 0 8 1 ffsino 272 5672 0 4248 96 0 96 96 0 8 0 nchpl 144 12234 0 10611 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 61452 0 61452 5 4 1 2 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 34822 0 34822 45 44 1 7 0 8 1 plimitpl 152 806 0 797 1 0 1 1 0 8 0 sigapl 432 4097 0 4082 6 4 2 3 0 8 0 futexpl 56 95846 0 95845 3 2 1 1 0 8 0 knotepl 112 2150 0 2131 9 7 2 3 0 8 1 kqueuepl 104 2869 0 2867 13 12 1 4 0 8 0 pipepl 160 3628 0 3609 19 17 2 2 0 8 1 fdescpl 488 4098 0 4082 6 3 3 3 0 8 0 filepl 152 50318 0 50216 62 55 7 14 0 8 2 lockfpl 104 1085 0 1084 1 0 1 1 0 8 0 lockfspl 48 358 0 357 1 0 1 1 0 8 0 sessionpl 112 121 0 111 1 0 1 1 0 8 0 pgrppl 48 164 0 154 1 0 1 1 0 8 0 ucredpl 96 8815 0 8806 1 0 1 1 0 8 0 zombiepl 144 4082 0 4081 4 3 1 1 0 8 0 processpl 904 4115 0 4081 8 4 4 5 0 8 0 procpl 632 11164 0 11118 6 1 5 6 0 8 0 srpgc 64 208 0 208 16 15 1 1 0 8 1 sosppl 128 165 0 165 19 18 1 1 0 8 1 sockpl 384 12603 0 12578 69 63 6 16 0 8 2 mcl64k 65536 32 0 0 3 0 3 3 0 8 0 mcl16k 16384 29 0 0 4 1 3 3 0 8 0 mcl12k 12288 38 0 0 2 0 2 2 0 8 0 mcl9k 9216 33 0 0 3 1 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 21 0 0 3 1 2 3 0 8 0 mcl2k2 2112 15 0 0 1 0 1 1 0 8 0 mcl2k 2048 176 0 0 19 2 17 19 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 766 0 0 41 0 41 41 0 8 0 bufpl 280 20383 0 13317 505 0 505 505 0 8 0 anonpl 16 598267 0 583534 142 75 67 80 0 125 0 amapchunkpl 152 42791 0 42529 94 83 11 19 0 158 0 amappl16 192 19312 0 18433 174 128 46 57 0 8 0 amappl15 184 767 0 764 1 0 1 1 0 8 0 amappl14 176 1404 0 1400 1 0 1 1 0 8 0 amappl13 168 193 0 193 7 7 0 1 0 8 0 amappl12 160 499 0 498 2 1 1 1 0 8 0 amappl11 152 782 0 769 1 0 1 1 0 8 0 amappl10 144 535 0 532 1 0 1 1 0 8 0 amappl9 136 2049 0 2045 1 0 1 1 0 8 0 amappl8 128 1234 0 1169 3 0 3 3 0 8 0 amappl7 120 1192 0 1177 1 0 1 1 0 8 0 amappl6 112 538 0 519 1 0 1 1 0 8 0 amappl5 104 1415 0 1403 1 0 1 1 0 8 0 amappl4 96 4444 0 4410 1 0 1 1 0 8 0 amappl3 88 989 0 982 1 0 1 1 0 8 0 amappl2 80 24431 0 24349 3 1 2 3 0 8 0 amappl1 72 124372 0 123893 24 14 10 20 0 8 0 amappl 80 13275 0 13226 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 64 134 0 5 3 0 3 3 0 8 0 uaddrrnd 24 4098 0 4082 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4098 0 4082 1 0 1 1 0 8 0 vmmpekpl 168 42443 0 42415 2 0 2 2 0 8 0 vmmpepl 168 596546 0 594275 296 163 133 140 0 357 31 vmsppl 368 4097 0 4081 2 0 2 2 0 8 0 pdppl 4096 8203 0 8162 9 3 6 6 0 8 0 pvpl 32 1611445 0 1593001 343 181 162 191 0 265 4 pmappl 232 4097 0 4081 17 15 2 2 0 8 1 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 255 0 57 7 1 6 7 0 8 0