witness: lock order reversal: 1st 0xfffffd807f0045d8 vmmaplk (&map->lock) 2nd 0xfffffd806e45dc48 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(fffffd806e45dc48,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd806e45dc48,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd806e45dc38,81) at rw_enter+0xd4 rrw_enter(fffffd806e45dc38,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd807a830358,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd807a830358,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd8064478f38,ffff800024fcb958,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd8064478f38,0,ffff800024fcbbb0,ffff800024fcbb44,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f0045c0,20002000,2,1) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f0045c0,20002000,20003000,1) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f0045c0,fffffd8067135eb0,fffffd807b79e060,ffff800022f90000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020a993d8,ffff800024fcbda8,ffff800024fcbdf0) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024fcbe70) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024fcbe70) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb06ec5cff70, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024fcb5d0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022f90000 rax 0xffff800000a1cb40 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0x50a652f71e351100 r12 0xfffffd800297b100 r13 0 r14 0xffffffff825f0250 w_lodata+0x494e0 r15 0xffffffff825fbeb0 w_lodata+0x55140 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024fcb5c0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=479663 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020a989f8,0xffff800020a982a0 process=0xffff800020aa38d0 user=0xffff800024fc6000, vmspace=0xfffffd807f0045c0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 9215 288242 92273 32767 2 0x10 syz-executor.1 9215 215396 92273 32767 3 0x4000090 netio syz-executor.1 9215 439088 92273 32767 3 0x4000090 fsleep syz-executor.1 66504 57471 17848 32767 2 0x10 syz-executor.0 66504 9537 17848 32767 3 0x4000090 ttyout syz-executor.0 *66504 479663 17848 32767 7 0x4000010 syz-executor.0 17848 280907 77604 32767 3 0x90 nanosleep syz-executor.0 77604 135870 51228 0 3 0x82 wait syz-executor.0 92273 345240 46643 32767 3 0x90 nanosleep syz-executor.1 46643 275260 51228 0 3 0x82 wait syz-executor.1 27381 74131 0 0 3 0x14200 bored sosplice 51228 17902 818 0 3 0x82 thrsleep syz-fuzzer 51228 493529 818 0 3 0x4000082 thrsleep syz-fuzzer 51228 350758 818 0 3 0x4000082 kqread syz-fuzzer 51228 488263 818 0 3 0x4000082 thrsleep syz-fuzzer 51228 301251 818 0 3 0x4000082 thrsleep syz-fuzzer 51228 6654 818 0 3 0x4000082 thrsleep syz-fuzzer 51228 170560 818 0 3 0x4000082 thrsleep syz-fuzzer 51228 421853 818 0 3 0x4000082 thrsleep syz-fuzzer 51228 375815 818 0 3 0x4000082 thrsleep syz-fuzzer 51228 383769 818 0 3 0x4000082 thrsleep syz-fuzzer 818 122260 20588 0 3 0x10008a pause ksh 20588 504678 97343 0 3 0x92 select sshd 39439 488855 1 0 3 0x100083 ttyin getty 97343 415298 1 0 3 0x80 select sshd 98639 482188 73896 73 3 0x100090 kqread syslogd 73896 485722 1 0 3 0x100082 netio syslogd 15876 328356 1 77 3 0x100090 poll dhclient 85990 158997 1 0 3 0x80 poll dhclient 30901 290807 0 0 2 0x14200 zerothread 45163 6521 0 0 3 0x14200 aiodoned aiodoned 91536 289581 0 0 3 0x14200 syncer update 52261 140983 0 0 3 0x14200 cleaner cleaner 91059 315171 0 0 3 0x14200 reaper reaper 63372 33365 0 0 3 0x14200 pgdaemon pagedaemon 41516 142503 0 0 3 0x14200 bored crynlk 85287 437781 0 0 3 0x14200 bored crypto 42136 290854 0 0 3 0x14200 bored viomb 6344 48874 0 0 3 0x40014200 acpi0 acpi0 69018 185971 0 0 3 0x40014200 idle1 15929 21415 0 0 7 0x14200 softnet 3089 189728 0 0 3 0x14200 bored systqmp 82991 194225 0 0 3 0x14200 bored systq 88137 495030 0 0 3 0x40014200 bored softclock 47626 61731 0 0 3 0x40014200 idle0 64660 523659 0 0 3 0x14200 bored smr 1 300843 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 66504 (syz-executor.0) thread 0xffff800020a993d8 (479663) shared rwlock vmmaplk r = 0 (0xfffffd807f0045d8) #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 15929 (softnet) thread 0xffff800020a209e0 (21415) shared rwlock netlock r = 0 (0xffffffff8249ff18) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 if_input_process+0x84 sys/net/if.c:942 #2 ifiq_process+0x80 sys/net/ifq.c:607 #3 taskq_thread+0x9c sys/kern/kern_task.c:368 #4 proc_trampoline+0x1c shared rwlock softnet r = 0 (0xffff8000000230e0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 taskq_thread+0x8f sys/kern/kern_task.c:367 #2 proc_trampoline+0x1c ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9486 6342K 6342K 78643K 10660 0 pcb 13 10K 12K 78643K 15 0 rtable 105 3K 3K 78643K 1099 0 ifaddr 39 10K 10K 78643K 193 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 61 0 iov 0 0K 20K 78643K 233 0 mount 1 1K 1K 78643K 1 0 vnodes 1214 76K 76K 78643K 1695 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 24 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 435 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 8 25K 33K 78643K 949 0 sigio 0 0K 0K 78643K 2 0 proc 48 50K 83K 78643K 1353 0 subproc 34 2K 2K 78643K 391 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 178 0 in_multi 33 2K 2K 78643K 287 0 ether_multi 1 0K 0K 78643K 3 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 102 450K 450K 78643K 102 0 exec 0 0K 1K 78643K 520 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 128 31K 32K 78643K 4533 0 UVM aobj 130 5K 5K 78643K 132 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 81 0 NDP 7 0K 0K 78643K 72 0 temp 105 3030K 3102K 78643K 7639 0 kqueue 0 0K 0K 78643K 33 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 56 0 50 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 196 0 194 1 0 1 1 0 8 0 rtentry 112 263 0 219 2 0 2 2 0 8 0 unpcb 120 918 0 910 2 1 1 2 0 8 0 syncache 264 13 0 13 5 4 1 1 0 8 1 tcpqe 32 51 0 51 4 3 1 1 0 8 1 tcpcb 544 837 0 829 25 24 1 13 0 8 0 ipq 40 23 0 23 4 3 1 1 0 8 1 ipqe 40 873 0 873 4 3 1 1 0 8 1 inpcb 280 1592 0 1581 20 18 2 9 0 8 1 nd6 48 46 0 42 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1147 0 932 14 0 14 14 0 8 0 art_table 32 1148 0 932 2 0 2 2 0 8 0 art_node 16 262 0 222 1 0 1 1 0 8 0 sysvmsgpl 40 63 0 31 1 0 1 1 0 8 0 semapl 112 433 0 423 1 0 1 1 0 8 0 shmpl 112 130 0 2 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2518 0 1113 46 0 46 46 0 8 0 ffsino 272 2518 0 1113 94 0 94 94 0 8 0 nchpl 144 4040 0 2435 60 0 60 60 0 8 0 uvmvnodes 72 2918 0 0 54 0 54 54 0 8 0 vnodes 208 2918 0 0 154 0 154 154 0 8 0 namei 1024 16592 0 16592 2 1 1 2 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 12268 0 12268 22 19 3 7 0 8 3 plimitpl 152 215 0 206 1 0 1 1 0 8 0 sigapl 432 1057 0 1041 5 3 2 3 0 8 0 futexpl 56 23395 0 23394 1 0 1 1 0 8 0 knotepl 112 657 0 638 2 1 1 2 0 8 0 kqueuepl 104 771 0 769 7 6 1 4 0 8 0 pipepl 160 1150 0 1131 5 3 2 2 0 8 1 fdescpl 488 1058 0 1041 3 0 3 3 0 8 0 filepl 152 11375 0 11268 27 22 5 14 0 8 0 lockfpl 104 263 0 262 1 0 1 1 0 8 0 lockfspl 48 88 0 87 1 0 1 1 0 8 0 sessionpl 112 38 0 28 1 0 1 1 0 8 0 pgrppl 48 48 0 38 1 0 1 1 0 8 0 ucredpl 96 2083 0 2074 1 0 1 1 0 8 0 zombiepl 144 1041 0 1041 1 0 1 1 0 8 1 processpl 904 1075 0 1041 7 3 4 5 0 8 0 procpl 632 2858 0 2811 5 0 5 5 0 8 1 srpgc 64 42 0 42 5 4 1 1 0 8 1 sosppl 128 33 0 33 6 5 1 1 0 8 1 sockpl 384 2727 0 2706 30 27 3 14 0 8 0 mcl64k 65536 17 0 0 3 0 3 3 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 8 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 159 0 0 18 1 17 18 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 423 0 0 22 0 22 22 0 8 0 bufpl 280 8534 0 1468 505 0 505 505 0 8 0 anonpl 16 164038 0 149602 106 27 79 79 0 125 14 amapchunkpl 152 10065 0 9804 28 17 11 13 0 158 0 amappl16 192 5664 0 4811 97 45 52 55 0 8 8 amappl15 184 92 0 89 1 0 1 1 0 8 0 amappl14 176 388 0 385 1 0 1 1 0 8 0 amappl13 168 153 0 153 2 1 1 1 0 8 1 amappl12 160 38 0 35 2 1 1 1 0 8 0 amappl11 152 240 0 229 1 0 1 1 0 8 0 amappl10 144 46 0 45 1 0 1 1 0 8 0 amappl9 136 904 0 901 1 0 1 1 0 8 0 amappl8 128 384 0 344 2 0 2 2 0 8 0 amappl7 120 249 0 233 1 0 1 1 0 8 0 amappl6 112 188 0 173 1 0 1 1 0 8 0 amappl5 104 337 0 324 1 0 1 1 0 8 0 amappl4 96 1451 0 1421 1 0 1 1 0 8 0 amappl3 88 234 0 226 1 0 1 1 0 8 0 amappl2 80 6128 0 6048 3 1 2 3 0 8 0 amappl1 72 37788 0 37299 24 14 10 20 0 8 0 amappl 80 3447 0 3398 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 64 131 0 2 3 0 3 3 0 8 0 uaddrrnd 24 1058 0 1041 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1058 0 1041 1 0 1 1 0 8 0 vmmpekpl 168 14442 0 14415 2 0 2 2 0 8 0 vmmpepl 168 154345 0 152102 160 38 122 122 0 357 24 vmsppl 368 1057 0 1041 2 0 2 2 0 8 0 pdppl 4096 2123 0 2082 6 0 6 6 0 8 0 pvpl 32 449278 0 431011 232 43 189 189 0 265 38 pmappl 232 1057 0 1041 7 6 1 2 0 8 0 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 208 0 31 6 0 6 6 0 8 0