witness: lock order reversal: 1st 0xfffffd806e8b7470 vmmaplk (&map->lock) 2nd 0xfffffd807af10808 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(fffffd807af10808,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd807af10808,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd807af107f8,81) at rw_enter+0xd4 rrw_enter(fffffd807af107f8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd80747ee350,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd80747ee350,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd80747f06d0,ffff800024da5908,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd80747f06d0,0,ffff800024da5b60,ffff800024da5af4,0,0) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd806e8b7458,20002000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd806e8b7458,20002000,20005000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd806e8b7458,fffffd8068339bd8,fffffd8068339698,ffff800020d62000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020aa0f20,ffff800024da5d58,ffff800024da5da0) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024da5e20) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024da5e20) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfe6153607f0, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024da5580 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020d62000 rax 0xffff800000ae8280 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0x57f9ab6908855330 r12 0xfffffd800297b100 r13 0 r14 0xffffffff825e0ad0 w_lodata+0x39d60 r15 0xffffffff825fbca0 w_lodata+0x54f30 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024da5570 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=480322 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020aa07b8,0xffff800020aa0060 process=0xffff800020a9b1b8 user=0xffff800024da0000, vmspace=0xfffffd806e8b7458 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 11673 1505 14810 32767 2 0x10 syz-executor.1 11673 298852 14810 32767 3 0x4000090 ttyout syz-executor.1 *11673 480322 14810 32767 7 0x4000010 syz-executor.1 18178 161323 50585 32767 7 0x10 syz-executor.0 18178 397226 50585 32767 3 0x4000090 kqread syz-executor.0 18178 514122 50585 32767 3 0x4000090 kqread syz-executor.0 18178 263720 50585 32767 2 0x4000010 syz-executor.0 18178 87748 50585 32767 2 0x4000010 syz-executor.0 50585 88762 9966 32767 3 0x90 nanosleep syz-executor.0 9966 462380 35356 0 3 0x82 wait syz-executor.0 14810 479836 4426 32767 3 0x90 nanosleep syz-executor.1 4426 424363 35356 0 3 0x82 wait syz-executor.1 35742 87016 0 0 3 0x14200 bored sosplice 35356 475468 39030 0 3 0x82 thrsleep syz-fuzzer 35356 313168 39030 0 3 0x4000082 thrsleep syz-fuzzer 35356 98889 39030 0 3 0x4000082 thrsleep syz-fuzzer 35356 418364 39030 0 3 0x4000082 kqread syz-fuzzer 35356 233895 39030 0 3 0x4000082 thrsleep syz-fuzzer 35356 438921 39030 0 3 0x4000082 thrsleep syz-fuzzer 35356 276506 39030 0 3 0x4000082 thrsleep syz-fuzzer 35356 31539 39030 0 3 0x4000082 thrsleep syz-fuzzer 35356 205331 39030 0 3 0x4000082 thrsleep syz-fuzzer 35356 240083 39030 0 3 0x4000082 thrsleep syz-fuzzer 35356 124519 39030 0 3 0x4000082 thrsleep syz-fuzzer 39030 354629 55431 0 3 0x10008a pause ksh 55431 66444 76031 0 3 0x92 select sshd 62579 271029 1 0 3 0x100083 ttyin getty 76031 314699 1 0 3 0x80 select sshd 35656 3584 86638 73 3 0x100090 kqread syslogd 86638 106859 1 0 3 0x100082 netio syslogd 89884 289131 1 77 3 0x100090 poll dhclient 62431 496765 1 0 3 0x80 poll dhclient 79922 197201 0 0 2 0x14200 zerothread 28207 293456 0 0 3 0x14200 aiodoned aiodoned 55408 209000 0 0 3 0x14200 syncer update 32774 288786 0 0 3 0x14200 cleaner cleaner 30547 522520 0 0 3 0x14200 reaper reaper 87418 351879 0 0 3 0x14200 pgdaemon pagedaemon 13946 425090 0 0 3 0x14200 bored crynlk 83957 240585 0 0 3 0x14200 bored crypto 40221 194497 0 0 3 0x14200 bored viomb 51023 435260 0 0 3 0x40014200 acpi0 acpi0 20533 477138 0 0 3 0x40014200 idle1 368 101585 0 0 3 0x14200 bored softnet 86553 209992 0 0 3 0x14200 bored systqmp 8292 67326 0 0 3 0x14200 bored systq 94809 224478 0 0 3 0x40014200 bored softclock 74008 522576 0 0 3 0x40014200 idle0 81682 477738 0 0 3 0x14200 bored smr 1 126917 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 11673 (syz-executor.1) thread 0xffff800020aa0f20 (480322) shared rwlock vmmaplk r = 0 (0xfffffd806e8b7470) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9498 6343K 6343K 78643K 13569 0 pcb 13 10K 12K 78643K 15 0 rtable 113 3K 4K 78643K 31951 0 ifaddr 39 21K 29K 78643K 5365 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 1398 0 iov 0 0K 64K 78643K 5936 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 17723 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 477 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 12485 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 8 25K 33K 78643K 30497 0 sigio 0 0K 0K 78643K 802 0 proc 48 50K 83K 78643K 35164 0 subproc 34 2K 2K 78643K 12699 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 1K 78643K 8784 0 in_multi 33 2K 2K 78643K 8817 0 ether_multi 1 0K 0K 78643K 60 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 174 768K 768K 78643K 174 0 exec 0 0K 1K 78643K 13269 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 303 41K 42K 78643K 116308 0 UVM aobj 130 6K 6K 78643K 134 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 1K 78643K 2990 0 NDP 5 0K 0K 78643K 2244 0 temp 109 3040K 3202K 78643K 180647 0 kqueue 0 0K 2K 78643K 5553 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 1605 0 1599 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 5633 0 5631 1 0 1 1 0 8 0 rtentry 112 7612 0 7564 2 0 2 2 0 8 0 unpcb 120 33689 0 33658 119 117 2 3 0 8 0 syncache 264 294 0 294 117 116 1 1 0 8 1 sackhl 24 19 0 19 17 17 0 1 0 8 0 tcpqe 32 342 0 342 71 71 0 1 0 8 0 tcpcb 544 25433 0 25424 403 402 1 15 0 8 0 ipq 40 402 0 402 109 108 1 1 0 8 1 ipqe 40 12977 0 12977 109 108 1 1 0 8 1 inpcb 280 50475 0 50449 211 208 3 10 0 8 0 ip6q 72 30 0 30 20 20 0 1 0 8 0 ip6af 40 286 0 286 20 20 0 1 0 8 0 nd6 48 1498 0 1494 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 33421 0 33149 48 30 18 18 0 8 1 art_table 32 33422 0 33149 11 8 3 3 0 8 0 art_node 16 7611 0 7567 1 0 1 1 0 8 0 sysvmsgpl 40 56 0 22 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 12483 0 12473 1 0 1 1 0 8 0 shmpl 112 132 0 4 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 31793 0 30290 52 3 49 49 0 8 0 ffsino 272 31793 0 30290 109 8 101 101 0 8 0 nchpl 144 72222 0 70561 63 1 62 62 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 402757 0 402757 11 10 1 2 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 211523 0 211523 253 250 3 7 0 8 3 plimitpl 152 5444 0 5435 1 0 1 1 0 8 0 sigapl 432 28433 0 28417 33 31 2 3 0 8 0 futexpl 56 831707 0 831707 6 5 1 1 0 8 1 knotepl 112 52299 0 52277 169 167 2 5 0 8 1 kqueuepl 104 73192 0 73184 211 210 1 5 0 8 0 pipepl 160 26752 0 26731 89 87 2 3 0 8 1 fdescpl 488 28434 0 28417 3 0 3 3 0 8 0 filepl 152 389725 0 389600 502 495 7 16 0 8 2 lockfpl 104 8691 0 8690 1 0 1 1 0 8 0 lockfspl 48 2719 0 2718 1 0 1 1 0 8 0 sessionpl 112 762 0 752 1 0 1 1 0 8 0 pgrppl 48 1265 0 1255 1 0 1 1 0 8 0 ucredpl 96 57895 0 57886 1 0 1 1 0 8 0 zombiepl 144 28417 0 28417 4 3 1 1 0 8 1 processpl 904 28451 0 28417 34 30 4 5 0 8 0 procpl 632 81527 0 81477 11 6 5 6 0 8 0 srpgc 64 1490 0 1490 98 97 1 1 0 8 1 sosppl 128 696 0 696 129 129 0 1 0 8 0 sockpl 384 90858 0 90804 549 541 8 18 0 8 2 mcl64k 65536 106 0 0 5 2 3 4 0 8 0 mcl16k 16384 135 0 0 12 9 3 3 0 8 0 mcl12k 12288 113 0 0 2 0 2 2 0 8 0 mcl9k 9216 84 0 0 5 3 2 2 0 8 0 mcl8k 8192 105 0 0 7 4 3 3 0 8 0 mcl4k 4096 57 0 0 5 2 3 3 0 8 0 mcl2k2 2112 17 0 0 2 0 2 2 0 8 0 mcl2k 2048 293 0 0 16 5 11 16 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 3194 0 0 35 5 30 31 0 8 0 bufpl 280 87849 0 80783 506 0 506 506 0 8 0 anonpl 16 4703957 0 4688466 643 570 73 84 0 125 2 amapchunkpl 152 305251 0 304987 618 605 13 20 0 158 2 amappl16 192 162257 0 161330 875 820 55 69 0 8 5 amappl15 184 6005 0 5998 1 0 1 1 0 8 0 amappl14 176 9146 0 9141 1 0 1 1 0 8 0 amappl13 168 2489 0 2487 14 13 1 1 0 8 0 amappl12 160 3009 0 3001 1 0 1 1 0 8 0 amappl11 152 4732 0 4721 1 0 1 1 0 8 0 amappl10 144 2945 0 2935 2 1 1 1 0 8 0 amappl9 136 12644 0 12638 1 0 1 1 0 8 0 amappl8 128 9731 0 9529 9 2 7 7 0 8 0 amappl7 120 7564 0 7545 1 0 1 1 0 8 0 amappl6 112 2932 0 2894 9 7 2 2 0 8 0 amappl5 104 9298 0 9289 1 0 1 1 0 8 0 amappl4 96 28557 0 28517 27 25 2 2 0 8 1 amappl3 88 6987 0 6979 1 0 1 1 0 8 0 amappl2 80 172628 0 172536 6 4 2 3 0 8 0 amappl1 72 822322 0 821840 24 14 10 20 0 8 0 amappl 80 94645 0 94596 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 64 133 0 4 3 0 3 3 0 8 0 uaddrrnd 24 28434 0 28417 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 28434 0 28417 1 0 1 1 0 8 0 vmmpekpl 168 273263 0 273231 3 0 3 3 0 8 0 vmmpepl 168 4266292 0 4263740 1077 926 151 161 0 357 25 vmsppl 368 28433 0 28417 2 0 2 2 0 8 0 pdppl 4096 56875 0 56834 7 1 6 6 0 8 0 pvpl 32 11580831 0 11560992 1683 1500 183 205 0 265 15 pmappl 232 28433 0 28417 98 96 2 2 0 8 1 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 701 0 510 10 4 6 6 0 8 0