witness: lock order reversal: 1st 0xfffffd806e8adba0 vmmaplk (&map->lock) 2nd 0xfffffd8067b5a2b8 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(fffffd8067b5a2b8,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd8067b5a2b8,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd8067b5a2a8,81) at rw_enter+0xd4 rrw_enter(fffffd8067b5a2a8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd80673fd1c0,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd80673fd1c0,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd8068834678,ffff800024fc9998,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd8068834678,0,ffff800024fc9bf0,ffff800024fc9b84,0,0) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd806e8adb88,20000000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd806e8adb88,20000000,20003000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd806e8adb88,fffffd806b3a1030,fffffd806b3a10d8,ffff800020b5a000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020a99b40,ffff800024fc9de8,ffff800024fc9e30) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024fc9eb0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024fc9eb0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x92ebcb0ca20, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024fc9610 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020b5a000 rax 0xffff800000a08d40 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xf09f13ef17a978c4 r12 0xfffffd800297b100 r13 0 r14 0xffffffff825f01a0 w_lodata+0x49430 r15 0xffffffff825fbe00 w_lodata+0x55090 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024fc9600 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=266862 stat=onproc flags process=10 proc=4000000 pri=77, usrpri=77, nice=20 forw=0xffffffffffffffff, list=0xffff800020a99160,0xffff800020a993e8 process=0xffff800020aece38 user=0xffff800024fc4000, vmspace=0xfffffd806e8adb88 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 42280 54593 47394 32767 7 0x10 syz-executor.1 *42280 266862 47394 32767 7 0x4000010 syz-executor.1 42280 178184 47394 32767 3 0x4000090 fsleep syz-executor.1 68348 442231 90091 32767 3 0x10 biowait syz-executor.0 90091 492118 55536 0 3 0x82 wait syz-executor.0 47394 66581 42207 32767 3 0x90 nanosleep syz-executor.1 42207 43728 55536 0 3 0x82 wait syz-executor.1 18326 348151 0 0 3 0x14200 bored sosplice 55536 108452 69489 0 3 0x82 thrsleep syz-fuzzer 55536 216723 69489 0 3 0x4000082 nanosleep syz-fuzzer 55536 269427 69489 0 3 0x4000082 thrsleep syz-fuzzer 55536 304688 69489 0 3 0x4000082 kqread syz-fuzzer 55536 215038 69489 0 3 0x4000082 thrsleep syz-fuzzer 55536 447845 69489 0 3 0x4000082 thrsleep syz-fuzzer 55536 95208 69489 0 3 0x4000082 thrsleep syz-fuzzer 55536 419898 69489 0 3 0x4000082 thrsleep syz-fuzzer 55536 13618 69489 0 3 0x4000082 thrsleep syz-fuzzer 55536 398198 69489 0 3 0x4000082 thrsleep syz-fuzzer 69489 425986 64194 0 3 0x10008a pause ksh 64194 317458 6209 0 3 0x92 select sshd 1818 399002 1 0 3 0x100083 ttyin getty 6209 31437 1 0 3 0x80 select sshd 15779 411814 87970 73 3 0x100090 kqread syslogd 87970 209134 1 0 3 0x100082 netio syslogd 94720 243671 1 77 3 0x100090 poll dhclient 78348 279293 1 0 3 0x80 poll dhclient 22428 404996 0 0 3 0x14200 pgzero zerothread 41839 484074 0 0 3 0x14200 aiodoned aiodoned 35579 200780 0 0 3 0x14200 syncer update 5168 78369 0 0 3 0x14200 cleaner cleaner 77143 358654 0 0 3 0x14200 reaper reaper 94575 168910 0 0 3 0x14200 pgdaemon pagedaemon 85685 71023 0 0 3 0x14200 bored crynlk 57525 198755 0 0 3 0x14200 bored crypto 28699 336763 0 0 3 0x14200 bored viomb 68152 338076 0 0 3 0x40014200 acpi0 acpi0 80336 507638 0 0 3 0x40014200 idle1 39811 277866 0 0 3 0x14200 bored softnet 76417 228976 0 0 3 0x14200 bored systqmp 93992 480484 0 0 3 0x14200 bored systq 26901 477501 0 0 3 0x40014200 bored softclock 47279 504228 0 0 3 0x40014200 idle0 58433 110828 0 0 3 0x14200 bored smr 1 135178 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 42280 (syz-executor.1) thread 0xffff800020a99b40 (266862) shared rwlock vmmaplk r = 0 (0xfffffd806e8adba0) #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 Process 68348 (syz-executor.0) thread 0xffff800020a998c8 (442231) exclusive rrwlock inode r = 0 (0xfffffd8067b5a098) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453 #3 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x13e sys/ufs/ffs/ffs_vfsops.c:1352 #5 ffs_inode_alloc+0x1cf sys/ufs/ffs/ffs_alloc.c:392 #6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1164 #7 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 #8 domkdirat+0x121 sys/kern/vfs_syscalls.c:2974 #9 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #9 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8078d22d60) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:309 #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 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419 #6 namei+0x63c sys/kern/vfs_lookup.c:249 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:2959 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9493 6343K 6343K 78643K 10716 0 pcb 13 10K 12K 78643K 15 0 rtable 105 3K 3K 78643K 1598 0 ifaddr 39 10K 10K 78643K 281 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 65 0 iov 0 0K 48K 78643K 212 0 mount 1 1K 1K 78643K 1 0 vnodes 1214 76K 76K 78643K 1905 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 15 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 587 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 7 21K 33K 78643K 1393 0 sigio 0 0K 0K 78643K 88 0 proc 48 50K 83K 78643K 1930 0 subproc 34 2K 2K 78643K 595 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 204 0 in_multi 33 2K 2K 78643K 422 0 ether_multi 1 0K 0K 78643K 5 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 144 636K 636K 78643K 144 0 exec 0 0K 1K 78643K 758 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 132 23K 38K 78643K 6019 0 UVM aobj 130 5K 5K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 116 0 NDP 5 0K 0K 78643K 108 0 temp 106 3034K 3109K 78643K 9843 0 kqueue 0 0K 0K 78643K 31 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 79 0 73 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 231 0 229 1 0 1 1 0 8 0 rtentry 112 382 0 338 2 0 2 2 0 8 0 unpcb 120 1426 0 1415 5 3 2 2 0 8 1 syncache 264 12 0 12 5 5 0 1 0 8 0 tcpqe 32 120 0 120 5 5 0 1 0 8 0 tcpcb 544 1136 0 1131 27 26 1 12 0 8 0 ipq 40 8 0 8 2 1 1 1 0 8 1 ipqe 40 198 0 198 2 1 1 1 0 8 1 inpcb 280 3679 0 3671 19 17 2 10 0 8 0 ip6q 72 1 0 1 1 1 0 1 0 8 0 ip6af 40 3 0 3 1 1 0 1 0 8 0 nd6 48 70 0 66 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1690 0 1475 14 0 14 14 0 8 0 art_table 32 1691 0 1475 2 0 2 2 0 8 0 art_node 16 381 0 341 1 0 1 1 0 8 0 sysvmsgpl 40 38 0 20 1 0 1 1 0 8 0 semupl 112 5 0 5 2 2 0 1 0 8 0 semapl 112 585 0 575 1 0 1 1 0 8 0 shmpl 112 129 0 1 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2712 0 1306 46 0 46 46 0 8 0 ffsino 272 2712 0 1306 94 0 94 94 0 8 0 nchpl 144 4627 0 3022 60 0 60 60 0 8 0 uvmvnodes 72 3316 0 0 61 0 61 61 0 8 0 vnodes 208 3316 0 0 175 0 175 175 0 8 0 namei 1024 20023 0 20022 1 0 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 13637 0 13636 13 12 1 7 0 8 0 plimitpl 152 281 0 272 1 0 1 1 0 8 0 sigapl 432 1465 0 1450 6 3 3 3 0 8 1 futexpl 56 29307 0 29306 1 0 1 1 0 8 0 knotepl 112 714 0 695 2 1 1 2 0 8 0 kqueuepl 104 999 0 997 7 6 1 4 0 8 0 pipepl 160 1320 0 1301 4 2 2 2 0 8 1 fdescpl 488 1466 0 1450 3 0 3 3 0 8 0 filepl 152 15120 0 15019 32 26 6 15 0 8 1 lockfpl 104 438 0 437 1 0 1 1 0 8 0 lockfspl 48 125 0 124 1 0 1 1 0 8 0 sessionpl 112 50 0 40 1 0 1 1 0 8 0 pgrppl 48 94 0 84 1 0 1 1 0 8 0 ucredpl 96 2542 0 2533 1 0 1 1 0 8 0 zombiepl 144 1450 0 1450 1 0 1 1 0 8 1 processpl 904 1483 0 1450 7 2 5 5 0 8 1 procpl 632 3829 0 3785 5 0 5 5 0 8 1 srpgc 64 66 0 66 7 6 1 1 0 8 1 sosppl 128 26 0 26 4 4 0 1 0 8 0 sockpl 384 5428 0 5407 39 33 6 16 0 8 2 mcl64k 65536 15 0 0 2 0 2 2 0 8 0 mcl16k 16384 13 0 0 2 0 2 2 0 8 0 mcl12k 12288 14 0 0 2 0 2 2 0 8 0 mcl9k 9216 9 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 12 0 0 2 0 2 2 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 166 0 0 20 0 20 20 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 462 0 0 28 0 28 28 0 8 0 bufpl 280 8530 0 1464 505 0 505 505 0 8 0 anonpl 16 210205 0 196013 113 44 69 76 0 125 5 amapchunkpl 152 14295 0 14169 43 33 10 19 0 158 3 amappl16 192 6816 0 5950 109 57 52 58 0 8 8 amappl15 184 472 0 469 1 0 1 1 0 8 0 amappl14 176 394 0 391 1 0 1 1 0 8 0 amappl13 168 179 0 178 4 3 1 1 0 8 0 amappl12 160 76 0 75 1 0 1 1 0 8 0 amappl11 152 184 0 170 1 0 1 1 0 8 0 amappl10 144 126 0 122 1 0 1 1 0 8 0 amappl9 136 1193 0 1190 1 0 1 1 0 8 0 amappl8 128 592 0 550 2 0 2 2 0 8 0 amappl7 120 404 0 387 1 0 1 1 0 8 0 amappl6 112 153 0 138 1 0 1 1 0 8 0 amappl5 104 435 0 424 1 0 1 1 0 8 0 amappl4 96 1724 0 1689 1 0 1 1 0 8 0 amappl3 88 483 0 475 1 0 1 1 0 8 0 amappl2 80 8672 0 8599 3 1 2 3 0 8 0 amappl1 72 49348 0 48882 24 14 10 20 0 8 0 amappl 80 4603 0 4560 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 64 130 0 1 3 0 3 3 0 8 0 uaddrrnd 24 1466 0 1450 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1466 0 1450 1 0 1 1 0 8 0 vmmpekpl 168 17401 0 17372 2 0 2 2 0 8 0 vmmpepl 168 213135 0 210987 148 22 126 130 0 357 27 vmsppl 368 1465 0 1450 2 0 2 2 0 8 0 pdppl 4096 2939 0 2900 6 0 6 6 0 8 0 pvpl 32 581430 0 564005 232 63 169 185 0 265 17 pmappl 232 1465 0 1450 7 5 2 2 0 8 1 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 215 0 30 6 0 6 6 0 8 0