witness: lock order reversal: 1st 0xfffffd806e8aad10 vmmaplk (&map->lock) 2nd 0xfffffd8063e962b8 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(fffffd8063e962b8,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd8063e962b8,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd8063e962a8,81) at rw_enter+0xd4 rrw_enter(fffffd8063e962a8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd80673ec5c8,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd80673ec5c8,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd80672c9528,ffff800022d61018,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd80672c9528,8000000000002000,ffff800022d61270,ffff800022d61204,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd806e8aacf8,20004000,2,1) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd806e8aacf8,20004000,20005000,1) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd806e8aacf8,fffffd8068d48960,fffffd8068d48180,ffff800022d88000,ffffffff81b6d177,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020a99650,ffff800022d61468,ffff800022d614b0) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800022d61530) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022d61530) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe2d7710b220, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800022d60c90 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022d88000 rax 0xffff8000009f5180 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0x60ba3e15eaf69cef r12 0xfffffd800297b100 r13 0 r14 0xffffffff825f1640 w_lodata+0x4a8d0 r15 0xffffffff825fbd50 w_lodata+0x54fe0 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022d60c80 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=345209 stat=onproc flags process=10 proc=4000000 pri=73, usrpri=73, nice=20 forw=0xffffffffffffffff, list=0xffff800020a98508,0xffffffff82659068 process=0xffff800020a9a010 user=0xffff800022d5c000, vmspace=0xfffffd806e8aacf8 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 93150 333675 56433 32767 7 0x10 syz-executor.1 *93150 345209 56433 32767 7 0x4000010 syz-executor.1 93733 274813 56795 32767 3 0x90 nanosleep syz-executor.0 93733 86385 56795 32767 3 0x4000090 fsleep syz-executor.0 93733 96796 56795 32767 3 0x4000090 kqread syz-executor.0 56433 230259 3369 32767 3 0x90 nanosleep syz-executor.1 3369 475798 11854 0 3 0x82 wait syz-executor.1 56795 360205 69731 32767 3 0x90 nanosleep syz-executor.0 69731 131018 11854 0 3 0x82 wait syz-executor.0 95236 381563 0 0 3 0x14200 bored sosplice 11854 270921 55405 0 3 0x82 thrsleep syz-fuzzer 11854 490693 55405 0 3 0x4000082 nanosleep syz-fuzzer 11854 182760 55405 0 3 0x4000082 thrsleep syz-fuzzer 11854 452107 55405 0 3 0x4000082 thrsleep syz-fuzzer 11854 37337 55405 0 3 0x4000082 nanosleep syz-fuzzer 11854 442204 55405 0 3 0x4000082 thrsleep syz-fuzzer 11854 303063 55405 0 3 0x4000082 thrsleep syz-fuzzer 11854 435871 55405 0 3 0x4000082 thrsleep syz-fuzzer 11854 468836 55405 0 3 0x4000082 thrsleep syz-fuzzer 11854 485071 55405 0 3 0x4000082 kqread syz-fuzzer 55405 106338 67173 0 3 0x10008a pause ksh 67173 195472 23523 0 3 0x92 select sshd 24645 110240 1 0 3 0x100083 ttyin getty 23523 263824 1 0 3 0x80 select sshd 83432 423018 60942 73 3 0x100090 kqread syslogd 60942 371430 1 0 3 0x100082 netio syslogd 35480 164002 1 77 3 0x100090 poll dhclient 96254 90663 1 0 3 0x80 poll dhclient 56113 296871 0 0 3 0x14200 pgzero zerothread 47187 359302 0 0 3 0x14200 aiodoned aiodoned 88673 88963 0 0 3 0x14200 syncer update 70659 10849 0 0 3 0x14200 cleaner cleaner 73521 502307 0 0 3 0x14200 reaper reaper 66393 505673 0 0 3 0x14200 pgdaemon pagedaemon 19488 478732 0 0 3 0x14200 bored crynlk 90034 229497 0 0 3 0x14200 bored crypto 46711 205290 0 0 3 0x14200 bored viomb 71291 57072 0 0 3 0x40014200 acpi0 acpi0 95738 14509 0 0 3 0x40014200 idle1 5161 276390 0 0 3 0x14200 bored softnet 52336 114908 0 0 3 0x14200 bored systqmp 12165 255122 0 0 3 0x14200 bored systq 83594 375475 0 0 3 0x40014200 bored softclock 35992 215337 0 0 3 0x40014200 idle0 85062 85811 0 0 3 0x14200 bored smr 1 435705 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 93150 (syz-executor.1) thread 0xffff800020a99650 (345209) shared rwlock vmmaplk r = 0 (0xfffffd806e8aad10) #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 9488 6342K 6342K 78643K 10670 0 pcb 13 10K 12K 78643K 15 0 rtable 105 3K 3K 78643K 1172 0 ifaddr 39 10K 10K 78643K 206 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 60 0 iov 0 0K 48K 78643K 185 0 mount 1 1K 1K 78643K 1 0 vnodes 1214 76K 76K 78643K 1768 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 3 5K 5K 78643K 9 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 384 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 8 25K 33K 78643K 968 0 sigio 0 0K 0K 78643K 22 0 proc 48 50K 82K 78643K 1451 0 subproc 34 2K 2K 78643K 425 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 137 0 in_multi 33 2K 2K 78643K 302 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 114 503K 503K 78643K 114 0 exec 0 0K 1K 78643K 580 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 130 23K 31K 78643K 4905 0 UVM aobj 130 5K 5K 78643K 136 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 97 0 NDP 5 0K 0K 78643K 78 0 temp 107 3036K 3105K 78643K 7820 0 kqueue 0 0K 0K 78643K 48 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 55 0 49 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 198 0 195 1 0 1 1 0 8 0 rtentry 112 278 0 234 2 0 2 2 0 8 0 unpcb 120 894 0 882 4 2 2 2 0 8 1 syncache 264 17 0 17 5 4 1 1 0 8 1 tcpqe 32 54 0 54 4 3 1 1 0 8 1 tcpcb 544 709 0 704 16 14 2 14 0 8 1 ipq 40 15 0 15 5 4 1 1 0 8 1 ipqe 40 147 0 147 5 4 1 1 0 8 1 inpcb 280 1432 0 1424 14 11 3 9 0 8 2 nd6 48 50 0 46 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1232 0 1017 14 0 14 14 0 8 0 art_table 32 1233 0 1017 2 0 2 2 0 8 0 art_node 16 277 0 237 1 0 1 1 0 8 0 sysvmsgpl 40 46 0 12 1 0 1 1 0 8 0 semapl 112 382 0 372 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2386 0 982 46 0 46 46 0 8 0 ffsino 272 2386 0 982 94 0 94 94 0 8 0 nchpl 144 3756 0 2144 60 0 60 60 0 8 0 uvmvnodes 72 2820 0 0 52 0 52 52 0 8 0 vnodes 208 2820 0 0 149 0 149 149 0 8 0 namei 1024 18081 0 18081 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 11243 0 11243 15 12 3 7 0 8 3 plimitpl 152 183 0 174 1 0 1 1 0 8 0 sigapl 432 1070 0 1054 4 2 2 3 0 8 0 futexpl 56 24074 0 24073 1 0 1 1 0 8 0 knotepl 112 570 0 550 4 3 1 2 0 8 0 kqueuepl 104 625 0 621 4 3 1 4 0 8 0 pipepl 160 950 0 929 7 5 2 2 0 8 1 fdescpl 488 1071 0 1054 3 0 3 3 0 8 0 filepl 152 11630 0 11520 22 15 7 14 0 8 2 lockfpl 104 1244 0 1242 1 0 1 1 0 8 0 lockfspl 48 229 0 227 1 0 1 1 0 8 0 sessionpl 112 40 0 30 1 0 1 1 0 8 0 pgrppl 48 55 0 45 1 0 1 1 0 8 0 ucredpl 96 2089 0 2080 1 0 1 1 0 8 0 zombiepl 144 1054 0 1054 1 0 1 1 0 8 1 processpl 904 1088 0 1054 5 1 4 5 0 8 0 procpl 632 3195 0 3149 5 0 5 5 0 8 0 srpgc 64 46 0 46 6 5 1 1 0 8 1 sosppl 128 37 0 37 5 4 1 1 0 8 1 sockpl 384 2569 0 2546 25 19 6 14 0 8 3 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 7 0 0 1 0 1 1 0 8 0 mcl12k 12288 13 0 0 2 0 2 2 0 8 0 mcl9k 9216 9 0 0 1 0 1 1 0 8 0 mcl8k 8192 16 0 0 2 0 2 2 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 185 0 0 23 1 22 23 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 374 0 0 20 0 20 20 0 8 0 bufpl 280 7859 0 1328 467 0 467 467 0 8 0 anonpl 16 157137 0 144869 88 26 62 73 0 125 0 amapchunkpl 152 10218 0 10090 23 16 7 10 0 158 0 amappl16 192 4783 0 3955 79 36 43 54 0 8 1 amappl15 184 384 0 376 1 0 1 1 0 8 0 amappl14 176 252 0 248 1 0 1 1 0 8 0 amappl13 168 92 0 91 1 0 1 1 0 8 0 amappl12 160 48 0 45 1 0 1 1 0 8 0 amappl11 152 218 0 207 1 0 1 1 0 8 0 amappl10 144 91 0 84 1 0 1 1 0 8 0 amappl9 136 959 0 956 1 0 1 1 0 8 0 amappl8 128 400 0 362 2 0 2 2 0 8 0 amappl7 120 313 0 291 1 0 1 1 0 8 0 amappl6 112 181 0 175 1 0 1 1 0 8 0 amappl5 104 341 0 330 1 0 1 1 0 8 0 amappl4 96 1313 0 1285 1 0 1 1 0 8 0 amappl3 88 234 0 227 1 0 1 1 0 8 0 amappl2 80 6262 0 6181 3 1 2 3 0 8 0 amappl1 72 39047 0 38562 25 15 10 20 0 8 0 amappl 80 3777 0 3733 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 64 135 0 6 3 0 3 3 0 8 0 uaddrrnd 24 1071 0 1054 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1071 0 1054 1 0 1 1 0 8 0 vmmpekpl 168 14995 0 14966 2 0 2 2 0 8 0 vmmpepl 168 158504 0 156281 170 44 126 126 0 357 28 vmsppl 368 1070 0 1054 2 0 2 2 0 8 0 pdppl 4096 2149 0 2108 6 0 6 6 0 8 0 pvpl 32 459258 0 443584 214 65 149 179 0 265 0 pmappl 232 1070 0 1054 7 5 2 2 0 8 1 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 195 0 18 6 0 6 6 0 8 0