witness: lock order reversal: 1st 0xfffffd806e8b4300 vmmaplk (&map->lock) 2nd 0xfffffd8072ef54e8 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(fffffd8072ef54e8,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd8072ef54e8,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd8072ef54d8,81) at rw_enter+0xd4 rrw_enter(fffffd8072ef54d8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd80737550f0,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd80737550f0,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd807211ebe0,ffff800020b5d0f8,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd807211ebe0,0,ffff800020b5d350,ffff800020b5d2e4,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd806e8b42e8,20002000,2,1) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd806e8b42e8,20002000,20003000,1) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd806e8b42e8,fffffd8067855270,fffffd8067855900,ffff800020b72000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020aa0c78,ffff800020b5d548,ffff800020b5d590) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800020b5d610) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020b5d610) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x676878c5f40, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020b5cd70 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020b72000 rax 0xffff800000aaf600 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xcf8de287286000b1 r12 0xfffffd800297b100 r13 0 r14 0xffffffff825e24f0 w_lodata+0x3b780 r15 0xffffffff825fbe00 w_lodata+0x55090 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b5cd60 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=460073 stat=onproc flags process=10 proc=4000000 pri=78, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff800020aa1b48,0xffff800020aa0f00 process=0xffff800020aa38d0 user=0xffff800020b58000, vmspace=0xfffffd806e8b42e8 estcpu=36, cpticks=3, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 91001 468622 38213 32767 7 0x10 syz-executor.0 *91001 460073 38213 32767 7 0x4000010 syz-executor.0 68231 327730 84369 32767 2 0x10 syz-executor.1 68231 104964 84369 32767 3 0x4000090 fsleep syz-executor.1 68231 520666 84369 32767 3 0x4000090 fsleep syz-executor.1 38213 462414 60426 32767 3 0x90 nanosleep syz-executor.0 60426 160939 53413 0 3 0x82 wait syz-executor.0 84369 284439 50308 32767 3 0x90 nanosleep syz-executor.1 50308 95799 53413 0 3 0x82 wait syz-executor.1 14059 95993 0 0 3 0x14200 bored sosplice 53413 344572 29887 0 3 0x82 thrsleep syz-fuzzer 53413 323245 29887 0 3 0x4000082 thrsleep syz-fuzzer 53413 315212 29887 0 3 0x4000082 thrsleep syz-fuzzer 53413 329362 29887 0 3 0x4000082 thrsleep syz-fuzzer 53413 308703 29887 0 3 0x4000082 thrsleep syz-fuzzer 53413 40364 29887 0 3 0x4000082 kqread syz-fuzzer 53413 99340 29887 0 3 0x4000082 thrsleep syz-fuzzer 53413 112797 29887 0 3 0x4000082 thrsleep syz-fuzzer 53413 324385 29887 0 3 0x4000082 thrsleep syz-fuzzer 53413 519181 29887 0 3 0x4000082 thrsleep syz-fuzzer 53413 378329 29887 0 3 0x4000082 thrsleep syz-fuzzer 29887 427106 10992 0 3 0x10008a pause ksh 10992 493474 1987 0 3 0x92 select sshd 30768 140134 1 0 3 0x100083 ttyin getty 1987 231348 1 0 3 0x80 select sshd 1274 54518 42389 73 3 0x100090 kqread syslogd 42389 361584 1 0 3 0x100082 netio syslogd 77636 203360 1 77 3 0x100090 poll dhclient 32699 26917 1 0 3 0x80 poll dhclient 24306 452602 0 0 2 0x14200 zerothread 46332 200421 0 0 3 0x14200 aiodoned aiodoned 84351 12998 0 0 3 0x14200 syncer update 96572 412560 0 0 3 0x14200 cleaner cleaner 41140 147043 0 0 3 0x14200 reaper reaper 44068 481427 0 0 3 0x14200 pgdaemon pagedaemon 52883 204053 0 0 3 0x14200 bored crynlk 13788 242265 0 0 3 0x14200 bored crypto 94379 405507 0 0 3 0x14200 bored viomb 46883 265289 0 0 3 0x40014200 acpi0 acpi0 40143 262622 0 0 3 0x40014200 idle1 43985 514489 0 0 3 0x14200 bored softnet 40166 9894 0 0 3 0x14200 bored systqmp 84426 371002 0 0 3 0x14200 bored systq 3384 17143 0 0 3 0x40014200 bored softclock 62177 494123 0 0 3 0x40014200 idle0 93845 27079 0 0 3 0x14200 bored smr 1 267276 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 91001 (syz-executor.0) thread 0xffff800020aa0c78 (460073) shared rwlock vmmaplk r = 0 (0xfffffd806e8b4300) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9496 6343K 6343K 78643K 12967 0 pcb 13 10K 12K 78643K 15 0 rtable 113 3K 4K 78643K 25576 0 ifaddr 39 21K 29K 78643K 4287 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 1157 0 iov 0 0K 52K 78643K 4381 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 14134 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 396 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 12066 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 8 25K 33K 78643K 23794 0 sigio 0 0K 0K 78643K 703 0 proc 48 50K 83K 78643K 28283 0 subproc 34 2K 2K 78643K 10149 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 1K 78643K 4249 0 in_multi 33 2K 2K 78643K 7111 0 ether_multi 1 0K 0K 78643K 66 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 162 715K 715K 78643K 162 0 exec 0 0K 1K 78643K 10421 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 241 39K 42K 78643K 92700 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 1968 0 NDP 5 0K 0K 78643K 1794 0 temp 107 3036K 3130K 78643K 120942 0 kqueue 0 0K 0K 78643K 627 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 1278 0 1272 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 4330 0 4328 1 0 1 1 0 8 0 rtentry 112 6083 0 6035 2 0 2 2 0 8 0 unpcb 120 22493 0 22471 92 90 2 3 0 8 1 syncache 264 286 0 286 91 90 1 1 0 8 1 sackhl 24 6 0 6 6 6 0 1 0 8 0 tcpqe 32 263 0 263 65 64 1 1 0 8 1 tcpcb 544 18991 0 18986 271 268 3 14 0 8 2 ipq 40 353 0 353 95 95 0 1 0 8 0 ipqe 40 12713 0 12713 95 95 0 1 0 8 0 inpcb 280 76924 0 76902 185 181 4 11 0 8 1 ip6q 72 29 0 29 18 18 0 1 0 8 0 ip6af 40 249 0 249 18 18 0 1 0 8 0 nd6 48 1196 0 1192 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 26695 0 26422 20 2 18 18 0 8 0 art_table 32 26696 0 26422 16 13 3 3 0 8 0 art_node 16 6082 0 6038 1 0 1 1 0 8 0 sysvmsgpl 40 37 0 27 2 1 1 1 0 8 0 semupl 112 3 0 3 2 2 0 1 0 8 0 semapl 112 12062 0 12052 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 24572 0 23113 48 0 48 48 0 8 0 ffsino 272 24572 0 23113 105 7 98 98 0 8 0 nchpl 144 53280 0 51631 64 2 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 275957 0 275957 4 3 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 171723 0 171723 219 218 1 7 0 8 1 plimitpl 152 4163 0 4154 1 0 1 1 0 8 0 sigapl 432 22180 0 22164 30 28 2 3 0 8 0 futexpl 56 499988 0 499986 4 3 1 1 0 8 0 knotepl 112 12891 0 12871 39 38 1 3 0 8 0 kqueuepl 104 14983 0 14980 51 50 1 4 0 8 0 pipepl 160 22434 0 22415 68 66 2 3 0 8 1 fdescpl 488 22181 0 22164 4 1 3 3 0 8 0 filepl 152 255186 0 255081 329 322 7 14 0 8 2 lockfpl 104 7124 0 7123 1 0 1 1 0 8 0 lockfspl 48 2306 0 2305 1 0 1 1 0 8 0 sessionpl 112 612 0 602 1 0 1 1 0 8 0 pgrppl 48 1016 0 1006 1 0 1 1 0 8 0 ucredpl 96 42436 0 42427 1 0 1 1 0 8 0 zombiepl 144 22164 0 22164 4 3 1 1 0 8 1 processpl 904 22198 0 22164 31 27 4 5 0 8 0 procpl 632 65044 0 64997 6 1 5 6 0 8 0 srpgc 64 1190 0 1190 90 89 1 1 0 8 1 sosppl 128 10801 0 10801 4 3 1 1 0 8 1 sockpl 384 104547 0 104513 408 400 8 18 0 8 3 mcl64k 65536 120 0 0 8 5 3 4 0 8 0 mcl16k 16384 84 0 0 7 4 3 3 0 8 0 mcl12k 12288 89 0 0 2 0 2 2 0 8 0 mcl9k 9216 89 0 0 4 2 2 2 0 8 0 mcl8k 8192 95 0 0 8 5 3 3 0 8 0 mcl4k 4096 49 0 0 3 0 3 3 0 8 0 mcl2k2 2112 13 0 0 1 0 1 1 0 8 0 mcl2k 2048 235 0 0 20 6 14 20 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 2728 0 0 50 9 41 50 0 8 0 bufpl 280 71705 0 64639 507 1 506 506 0 8 0 anonpl 16 3231008 0 3215194 372 299 73 95 0 125 0 amapchunkpl 152 236175 0 235912 425 414 11 24 0 158 0 amappl16 192 115478 0 114575 972 924 48 68 0 8 0 amappl15 184 5464 0 5459 1 0 1 1 0 8 0 amappl14 176 6520 0 6516 1 0 1 1 0 8 0 amappl13 168 2090 0 2085 50 49 1 1 0 8 0 amappl12 160 2391 0 2391 64 63 1 1 0 8 1 amappl11 152 3644 0 3633 1 0 1 1 0 8 0 amappl10 144 1812 0 1807 1 0 1 1 0 8 0 amappl9 136 10631 0 10626 1 0 1 1 0 8 0 amappl8 128 8582 0 8449 7 2 5 5 0 8 0 amappl7 120 5410 0 5393 1 0 1 1 0 8 0 amappl6 112 2191 0 2170 1 0 1 1 0 8 0 amappl5 104 7137 0 7128 1 0 1 1 0 8 0 amappl4 96 22971 0 22920 3 1 2 2 0 8 0 amappl3 88 4713 0 4706 1 0 1 1 0 8 0 amappl2 80 133732 0 133645 3 1 2 3 0 8 0 amappl1 72 648445 0 647974 103 93 10 20 0 8 0 amappl 80 75397 0 75341 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 22181 0 22164 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 22181 0 22164 1 0 1 1 0 8 0 vmmpekpl 168 230437 0 230410 2 0 2 2 0 8 0 vmmpepl 168 3291490 0 3289056 990 847 143 153 0 357 29 vmsppl 368 22180 0 22164 2 0 2 2 0 8 0 pdppl 4096 44369 0 44328 9 3 6 6 0 8 0 pvpl 32 8670036 0 8650108 1191 1026 165 230 0 265 0 pmappl 232 22180 0 22164 106 104 2 2 0 8 1 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 545 0 341 7 0 7 7 0 8 0