witness: lock order reversal: 1st 0xfffffd806e8b8750 vmmaplk (&map->lock) 2nd 0xfffffd8070c8c0a8 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(fffffd8070c8c0a8,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd8070c8c0a8,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd8070c8c098,81) at rw_enter+0xd4 rrw_enter(fffffd8070c8c098,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd8067912770,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd8067912770,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd806449bf00,ffff800024fa5868,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd806449bf00,0,ffff800024fa5ac0,ffff800024fa5a54,0,0) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd806e8b8738,20002000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd806e8b8738,20002000,20005000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd806e8b8738,fffffd8071d939e0,fffffd8071d93c80,ffff800023170000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020ac0290,ffff800024fa5cb8,ffff800024fa5d00) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024fa5d80) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024fa5d80) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb616ec7cd80, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024fa54e0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800023170000 rax 0xffff800000ac2580 r8 0xffffffff818af532 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xbc6ee519abae2f87 r12 0xfffffd800297c200 r13 0 r14 0xffffffff825e5b80 w_lodata+0x39d60 r15 0xffffffff82600f60 w_lodata+0x55140 rip 0xffffffff811551c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024fa54d0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=20380 stat=onproc flags process=10 proc=4000000 pri=83, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac0018,0xffffffff82616060 process=0xffff800020a9b1b8 user=0xffff800024fa0000, vmspace=0xfffffd806e8b8738 estcpu=33, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 10134 484571 96784 32767 2 0x10 syz-executor.0 10134 259500 96784 32767 3 0x4000090 ttyin syz-executor.0 10134 303776 96784 32767 2 0x4000010 syz-executor.0 92728 223775 60011 32767 7 0x10 syz-executor.1 92728 98247 60011 32767 3 0x4000090 ttyout syz-executor.1 *92728 20380 60011 32767 7 0x4000010 syz-executor.1 60011 3001 19816 32767 3 0x90 nanosleep syz-executor.1 19816 365980 13016 0 3 0x82 wait syz-executor.1 96784 112573 82744 32767 3 0x90 nanosleep syz-executor.0 82744 368919 13016 0 3 0x82 wait syz-executor.0 61858 418130 0 0 3 0x14200 bored sosplice 13016 249665 31743 0 3 0x82 thrsleep syz-fuzzer 13016 140774 31743 0 3 0x4000082 thrsleep syz-fuzzer 13016 5613 31743 0 3 0x4000082 thrsleep syz-fuzzer 13016 184805 31743 0 3 0x4000082 kqread syz-fuzzer 13016 392187 31743 0 3 0x4000082 thrsleep syz-fuzzer 13016 37757 31743 0 3 0x4000082 thrsleep syz-fuzzer 13016 355522 31743 0 3 0x4000082 thrsleep syz-fuzzer 13016 70062 31743 0 3 0x4000082 thrsleep syz-fuzzer 13016 428338 31743 0 3 0x4000082 thrsleep syz-fuzzer 13016 13788 31743 0 3 0x4000082 thrsleep syz-fuzzer 31743 455137 31976 0 3 0x10008a pause ksh 31976 157378 76155 0 3 0x92 select sshd 38407 515368 1 0 3 0x100083 ttyin getty 76155 150291 1 0 3 0x80 select sshd 270 244910 4029 73 3 0x100090 kqread syslogd 4029 4574 1 0 3 0x100082 netio syslogd 59009 476934 1 77 3 0x100090 poll dhclient 83185 52810 1 0 3 0x80 poll dhclient 26672 271517 0 0 2 0x14200 zerothread 28244 123927 0 0 3 0x14200 aiodoned aiodoned 70510 81834 0 0 3 0x14200 syncer update 39168 76902 0 0 3 0x14200 cleaner cleaner 99919 225207 0 0 3 0x14200 reaper reaper 101 92214 0 0 3 0x14200 pgdaemon pagedaemon 23676 418958 0 0 3 0x14200 bored crynlk 23585 453436 0 0 3 0x14200 bored crypto 24170 411334 0 0 3 0x40014200 acpi0 acpi0 97923 332770 0 0 3 0x40014200 idle1 41658 220889 0 0 3 0x14200 bored softnet 68916 352353 0 0 3 0x14200 bored systqmp 18737 18507 0 0 3 0x14200 bored systq 10939 58799 0 0 3 0x40014200 bored softclock 54844 57584 0 0 3 0x40014200 idle0 65451 87812 0 0 3 0x14200 bored smr 1 125222 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 92728 (syz-executor.1) thread 0xffff800020ac0290 (20380) shared rwlock vmmaplk r = 0 (0xfffffd806e8b8750) #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 9489 6334K 6334K 78643K 12877 0 pcb 13 10K 12K 78643K 15 0 rtable 113 3K 4K 78643K 24886 0 ifaddr 39 21K 29K 78643K 4117 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 1191 0 iov 0 0K 64K 78643K 5330 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 14443 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 436 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 6445 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 8 25K 33K 78643K 25893 0 sigio 0 0K 0K 78643K 1027 0 proc 48 50K 83K 78643K 27581 0 subproc 34 2K 2K 78643K 9792 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 2 0K 1K 78643K 5717 0 in_multi 33 2K 2K 78643K 7074 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 174 768K 768K 78643K 174 0 exec 0 0K 1K 78643K 10374 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 240 38K 44K 78643K 99287 0 UVM aobj 130 6K 6K 78643K 142 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 1K 78643K 2317 0 NDP 5 0K 0K 78643K 1731 0 temp 106 3034K 3142K 78643K 136959 0 kqueue 0 0K 1K 78643K 1376 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 1235 0 1229 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 22567 0 22565 1 0 1 1 0 8 0 rtentry 112 5875 0 5827 2 0 2 2 0 8 0 unpcb 120 27652 0 27624 108 106 2 3 0 8 1 syncache 264 267 0 267 98 98 0 1 0 8 0 sackhl 24 20 0 20 19 19 0 1 0 8 0 tcpqe 32 381 0 381 72 72 0 1 0 8 0 tcpcb 544 17747 0 17740 285 284 1 14 0 8 0 ipq 40 369 0 369 108 107 1 1 0 8 1 ipqe 40 13315 0 13315 108 107 1 1 0 8 1 inpcb 280 40299 0 40282 229 227 2 11 0 8 0 ip6q 72 36 0 36 24 24 0 1 0 8 0 ip6af 40 461 0 461 24 24 0 1 0 8 0 nd6 48 1155 0 1151 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 25649 0 25376 21 3 18 18 0 8 0 art_table 32 25650 0 25376 13 10 3 3 0 8 0 art_node 16 5872 0 5828 1 0 1 1 0 8 0 sysvmsgpl 40 48 0 24 1 0 1 1 0 8 0 semupl 112 4 0 4 2 2 0 1 0 8 0 semapl 112 6441 0 6431 1 0 1 1 0 8 0 shmpl 112 140 0 12 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 29700 0 28229 51 3 48 48 0 8 0 ffsino 272 29700 0 28229 108 9 99 99 0 8 0 nchpl 144 63044 0 61382 66 4 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 317500 0 317500 4 3 1 2 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 200936 0 200936 239 236 3 7 0 8 3 plimitpl 152 5302 0 5293 1 0 1 1 0 8 0 sigapl 432 24342 0 24326 25 22 3 3 0 8 1 futexpl 56 608277 0 608277 3 2 1 1 0 8 1 knotepl 112 38664 0 38645 160 158 2 7 0 8 1 kqueuepl 104 39773 0 39770 70 69 1 4 0 8 0 pipepl 160 22762 0 22737 96 94 2 2 0 8 0 fdescpl 488 24343 0 24326 4 1 3 3 0 8 0 filepl 152 297429 0 297289 378 372 6 15 0 8 0 lockfpl 104 7124 0 7123 1 0 1 1 0 8 0 lockfspl 48 2206 0 2205 1 0 1 1 0 8 0 sessionpl 112 591 0 581 1 0 1 1 0 8 0 pgrppl 48 968 0 958 1 0 1 1 0 8 0 ucredpl 96 53062 0 53053 1 0 1 1 0 8 0 zombiepl 144 24326 0 24326 1 0 1 1 0 8 1 processpl 904 24359 0 24326 4 0 4 4 0 8 0 procpl 632 71411 0 71365 19 14 5 5 0 8 1 srpgc 64 1148 0 1148 112 111 1 1 0 8 1 sosppl 128 676 0 676 117 116 1 1 0 8 1 sockpl 384 91457 0 91412 454 443 11 18 0 8 6 mcl64k 65536 66 0 0 4 1 3 3 0 8 0 mcl16k 16384 85 0 0 7 5 2 3 0 8 0 mcl12k 12288 110 0 0 4 2 2 2 0 8 0 mcl9k 9216 70 0 0 3 1 2 2 0 8 0 mcl8k 8192 81 0 0 5 2 3 3 0 8 0 mcl4k 4096 49 0 0 4 1 3 3 0 8 0 mcl2k2 2112 24 0 0 2 0 2 2 0 8 0 mcl2k 2048 262 0 0 19 8 11 19 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 3374 0 0 90 7 83 83 0 8 0 bufpl 280 76244 0 69178 506 0 506 506 0 8 0 anonpl 16 4190791 0 4176083 393 317 76 85 0 125 4 amapchunkpl 152 254065 0 253808 530 520 10 19 0 158 0 amappl16 192 155423 0 154554 770 719 51 68 0 8 0 amappl15 184 3855 0 3849 1 0 1 1 0 8 0 amappl14 176 7257 0 7254 1 0 1 1 0 8 0 amappl13 168 2181 0 2181 68 67 1 1 0 8 1 amappl12 160 2669 0 2661 9 8 1 1 0 8 0 amappl11 152 4365 0 4353 1 0 1 1 0 8 0 amappl10 144 2527 0 2519 1 0 1 1 0 8 0 amappl9 136 10490 0 10486 1 0 1 1 0 8 0 amappl8 128 7871 0 7722 8 2 6 6 0 8 0 amappl7 120 6048 0 6029 1 0 1 1 0 8 0 amappl6 112 2936 0 2914 1 0 1 1 0 8 0 amappl5 104 7313 0 7304 1 0 1 1 0 8 0 amappl4 96 24408 0 24364 5 3 2 2 0 8 0 amappl3 88 5956 0 5948 1 0 1 1 0 8 0 amappl2 80 153046 0 152959 3 1 2 3 0 8 0 amappl1 72 699916 0 699434 24 14 10 20 0 8 0 amappl 80 81901 0 81855 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 64 141 0 12 3 0 3 3 0 8 0 uaddrrnd 24 24343 0 24326 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 24343 0 24326 1 0 1 1 0 8 0 vmmpekpl 168 236407 0 236376 3 0 3 3 0 8 0 vmmpepl 168 3586375 0 3583963 1125 979 146 153 0 357 27 vmsppl 368 24342 0 24326 2 0 2 2 0 8 0 pdppl 4096 48693 0 48652 7 1 6 6 0 8 0 pvpl 32 11965666 0 11947714 1414 1218 196 204 0 265 34 pmappl 232 24342 0 24326 100 98 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 566 0 326 9 1 8 8 0 8 0