witness: lock order reversal: 1st 0xfffffd807f0088b8 vmmaplk (&map->lock) 2nd 0xfffffd807d5d2918 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(fffffd807d5d2918,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd807d5d2918,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd807d5d2908,81) at rw_enter+0xd4 rrw_enter(fffffd807d5d2908,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd806751cc48,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd806751cc48,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd80682a73c0,ffff800024b87978,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd80682a73c0,0,ffff800024b87bd0,ffff800024b87b64,0,0) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f0088a0,20000000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f0088a0,20000000,20003000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f0088a0,fffffd80633a8ec8,fffffd80633a86e8,ffff800020b4e000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020ac0508,ffff800024b87dc8,ffff800024b87e10) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024b87e90) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024b87e90) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4efde9cffd0, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024b875f0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020b4e000 rax 0xffff800000a21d40 r8 0xffffffff818af532 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xa5fa2aa621b1604c r12 0xfffffd800297c200 r13 0 r14 0xffffffff825f2d30 w_lodata+0x46f10 r15 0xffffffff82600f60 w_lodata+0x55140 rip 0xffffffff811551c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024b875e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=479331 stat=onproc flags process=10 proc=4000000 pri=81, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac0780,0xffff800020ac13e8 process=0xffff800020a9ae30 user=0xffff800024b82000, vmspace=0xfffffd807f0088a0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 40137 249382 29 32767 7 0x10 syz-executor.1 *40137 479331 29 32767 7 0x4000010 syz-executor.1 40137 167332 29 32767 3 0x4000090 fsleep syz-executor.1 82399 356728 86706 32767 3 0x90 nanosleep syz-executor.0 82399 425108 86706 32767 3 0x4000090 ttyout syz-executor.0 82399 407009 86706 32767 3 0x4000090 fsleep syz-executor.0 29 279526 99954 32767 3 0x90 nanosleep syz-executor.1 99954 485225 1727 0 3 0x82 wait syz-executor.1 86706 50459 95106 32767 3 0x90 nanosleep syz-executor.0 95106 35273 1727 0 3 0x82 wait syz-executor.0 10088 76894 0 0 3 0x14200 bored sosplice 1727 49547 44503 0 3 0x82 thrsleep syz-fuzzer 1727 369234 44503 0 3 0x4000082 thrsleep syz-fuzzer 1727 63950 44503 0 3 0x4000082 thrsleep syz-fuzzer 1727 453677 44503 0 3 0x4000082 thrsleep syz-fuzzer 1727 84943 44503 0 3 0x4000082 thrsleep syz-fuzzer 1727 295273 44503 0 3 0x4000082 thrsleep syz-fuzzer 1727 419741 44503 0 3 0x4000082 thrsleep syz-fuzzer 1727 114399 44503 0 3 0x4000082 thrsleep syz-fuzzer 1727 68604 44503 0 3 0x4000082 thrsleep syz-fuzzer 1727 229745 44503 0 3 0x4000082 kqread syz-fuzzer 44503 452933 84432 0 3 0x10008a pause ksh 84432 308208 20184 0 3 0x92 select sshd 35010 32773 1 0 3 0x100083 ttyin getty 20184 107414 1 0 3 0x80 select sshd 16701 61081 17395 73 3 0x100090 kqread syslogd 17395 57896 1 0 3 0x100082 netio syslogd 37395 101357 1 77 3 0x100090 poll dhclient 2210 64131 1 0 3 0x80 poll dhclient 48339 292885 0 0 3 0x14200 pgzero zerothread 71001 487762 0 0 3 0x14200 aiodoned aiodoned 53156 262595 0 0 3 0x14200 syncer update 32805 416027 0 0 3 0x14200 cleaner cleaner 76190 195791 0 0 3 0x14200 reaper reaper 31477 105168 0 0 3 0x14200 pgdaemon pagedaemon 70508 367352 0 0 3 0x14200 bored crynlk 48711 208027 0 0 3 0x14200 bored crypto 15870 130025 0 0 3 0x40014200 acpi0 acpi0 94472 78641 0 0 3 0x40014200 idle1 99668 214029 0 0 3 0x14200 bored softnet 25450 51392 0 0 3 0x14200 bored systqmp 47216 315609 0 0 3 0x14200 bored systq 97270 63683 0 0 3 0x40014200 bored softclock 78237 235916 0 0 3 0x40014200 idle0 87930 428097 0 0 3 0x14200 bored smr 1 100912 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 40137 (syz-executor.1) thread 0xffff800020ac0508 (479331) shared rwlock vmmaplk r = 0 (0xfffffd807f0088b8) #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 (0xffffffff82660f10) #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 9484 6334K 6334K 78643K 10692 0 pcb 13 8K 8K 78643K 13 0 rtable 109 3K 3K 78643K 1428 0 ifaddr 39 10K 10K 78643K 248 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 79 0 iov 0 0K 36K 78643K 224 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 2102 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 26 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 707 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 8 25K 33K 78643K 1332 0 sigio 0 0K 0K 78643K 42 0 proc 48 50K 83K 78643K 1757 0 subproc 34 2K 2K 78643K 527 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 333 0 in_multi 33 2K 2K 78643K 395 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 144 636K 636K 78643K 144 0 exec 0 0K 1K 78643K 665 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 5971 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 146 0 NDP 5 0K 0K 78643K 96 0 temp 108 3038K 3106K 78643K 9618 0 kqueue 0 0K 0K 78643K 41 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 70 0 62 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 227 0 225 1 0 1 1 0 8 0 rtentry 112 341 0 295 2 0 2 2 0 8 0 unpcb 120 1537 0 1525 5 4 1 2 0 8 0 syncache 264 16 0 16 6 5 1 1 0 8 1 tcpqe 32 26 0 26 3 3 0 1 0 8 0 tcpcb 544 813 0 808 8 7 1 3 0 8 0 ipq 40 25 0 25 6 5 1 1 0 8 1 ipqe 40 1125 0 1125 6 5 1 1 0 8 1 inpcb 280 2084 0 2073 8 6 2 4 0 8 0 nd6 48 62 0 58 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1485 0 1269 14 0 14 14 0 8 0 art_table 32 1486 0 1269 2 0 2 2 0 8 0 art_node 16 340 0 298 1 0 1 1 0 8 0 sysvmsgpl 40 40 0 16 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 705 0 695 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 2959 0 1554 46 0 46 46 0 8 0 ffsino 272 2959 0 1554 94 0 94 94 0 8 0 nchpl 144 4971 0 3365 60 0 60 60 0 8 0 uvmvnodes 72 3495 0 0 64 0 64 64 0 8 0 vnodes 208 3495 0 0 184 0 184 184 0 8 0 namei 1024 22732 0 22732 3 2 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 13479 0 13479 20 19 1 6 0 8 1 plimitpl 152 254 0 245 1 0 1 1 0 8 0 sigapl 432 1416 0 1400 4 2 2 3 0 8 0 futexpl 56 29801 0 29799 2 1 1 1 0 8 0 knotepl 112 1378 0 1359 3 2 1 2 0 8 0 kqueuepl 104 1283 0 1279 1 0 1 1 0 8 0 pipepl 160 1206 0 1187 5 4 1 2 0 8 0 fdescpl 488 1417 0 1400 4 1 3 3 0 8 0 filepl 152 17151 0 17040 17 11 6 8 0 8 1 lockfpl 104 312 0 311 1 0 1 1 0 8 0 lockfspl 48 104 0 103 1 0 1 1 0 8 0 sessionpl 112 46 0 36 1 0 1 1 0 8 0 pgrppl 48 64 0 54 1 0 1 1 0 8 0 ucredpl 96 4762 0 4753 1 0 1 1 0 8 0 zombiepl 144 1400 0 1400 1 0 1 1 0 8 1 processpl 904 1433 0 1400 4 0 4 4 0 8 0 procpl 632 3880 0 3834 7 2 5 5 0 8 1 srpgc 64 58 0 58 7 7 0 1 0 8 0 sosppl 128 29 0 29 9 9 0 1 0 8 0 sockpl 384 3886 0 3862 25 21 4 9 0 8 1 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 15 0 0 2 0 2 2 0 8 0 mcl4k 4096 9 0 0 2 0 2 2 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 159 0 0 18 0 18 18 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 457 0 0 21 0 21 21 0 8 0 bufpl 280 8248 0 1330 495 0 495 495 0 8 0 anonpl 16 260267 0 246911 111 44 67 80 0 125 0 amapchunkpl 152 14556 0 14426 35 26 9 19 0 158 2 amappl16 192 8806 0 7958 113 61 52 55 0 8 8 amappl15 184 279 0 276 1 0 1 1 0 8 0 amappl14 176 383 0 376 1 0 1 1 0 8 0 amappl13 168 168 0 168 4 4 0 1 0 8 0 amappl12 160 131 0 131 7 7 0 1 0 8 0 amappl11 152 232 0 221 1 0 1 1 0 8 0 amappl10 144 42 0 37 1 0 1 1 0 8 0 amappl9 136 1061 0 1057 1 0 1 1 0 8 0 amappl8 128 444 0 408 2 0 2 2 0 8 0 amappl7 120 296 0 279 1 0 1 1 0 8 0 amappl6 112 160 0 152 1 0 1 1 0 8 0 amappl5 104 699 0 688 1 0 1 1 0 8 0 amappl4 96 1721 0 1694 1 0 1 1 0 8 0 amappl3 88 368 0 352 1 0 1 1 0 8 0 amappl2 80 8565 0 8483 3 1 2 3 0 8 0 amappl1 72 47924 0 47431 24 13 11 20 0 8 0 amappl 80 4631 0 4582 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 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 1417 0 1400 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1417 0 1400 1 0 1 1 0 8 0 vmmpekpl 168 16679 0 16646 3 1 2 2 0 8 0 vmmpepl 168 207339 0 205101 185 64 121 138 0 357 23 vmsppl 368 1416 0 1400 2 0 2 2 0 8 0 pdppl 4096 2841 0 2800 7 1 6 6 0 8 0 pvpl 32 673105 0 656300 253 80 173 191 0 265 15 pmappl 232 1416 0 1400 5 4 1 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 187 0 12 6 0 6 6 0 8 0