witness: lock order reversal: 1st 0xfffffd807f0088b8 vmmaplk (&map->lock) 2nd 0xfffffd80677b56f8 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(fffffd80677b56f8,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd80677b56f8,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd80677b56e8,81) at rw_enter+0xd4 rrw_enter(fffffd80677b56e8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd8066f82d00,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd8066f82d00,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd8067aa5c78,ffff800024f66f88,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd8067aa5c78,10000,ffff800024f671e0,ffff800024f67174,0,0) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f0088a0,20010000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f0088a0,20010000,20011000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f0088a0,fffffd8070b8d7a8,fffffd8070b8d5b0,ffff800023148000,ffffffff818b1737,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020adeef0,ffff800024f673d8,ffff800024f67420) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024f674a0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024f674a0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9e0ea70bd50, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024f66c00 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800023148000 rax 0xffff800000a11f40 r8 0xffffffff818af532 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xe66e1cdf345bf408 r12 0xfffffd800297c200 r13 0 r14 0xffffffff825f0ad0 w_lodata+0x44cb0 r15 0xffffffff826010c0 w_lodata+0x552a0 rip 0xffffffff811551c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024f66bf0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=358462 stat=onproc flags process=10 proc=4000000 pri=74, usrpri=74, nice=20 forw=0xffffffffffffffff, list=0xffff800020ade298,0xffffffff82616060 process=0xffff800020a9bc50 user=0xffff800024f62000, vmspace=0xfffffd807f0088a0 estcpu=24, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 49761 185476 83025 32767 2 0x10 syz-executor.0 49761 445386 83025 32767 2 0x4000010 syz-executor.0 49761 226556 83025 32767 3 0x4000090 poll syz-executor.0 29243 154020 35555 32767 7 0x10 syz-executor.1 29243 479906 35555 32767 3 0x4000010 biowait syz-executor.1 29243 7975 35555 32767 3 0x4000090 poll syz-executor.1 *29243 358462 35555 32767 7 0x4000010 syz-executor.1 83025 138481 89796 32767 3 0x90 nanosleep syz-executor.0 89796 399229 80948 0 3 0x82 wait syz-executor.0 35555 229376 37985 32767 3 0x90 nanosleep syz-executor.1 37985 266058 80948 0 3 0x82 wait syz-executor.1 52927 330876 0 0 3 0x14200 bored sosplice 80948 303155 38437 0 3 0x82 thrsleep syz-fuzzer 80948 255950 38437 0 3 0x4000082 thrsleep syz-fuzzer 80948 381569 38437 0 3 0x4000082 kqread syz-fuzzer 80948 128924 38437 0 3 0x4000082 thrsleep syz-fuzzer 80948 78938 38437 0 3 0x4000082 thrsleep syz-fuzzer 80948 362477 38437 0 3 0x4000082 thrsleep syz-fuzzer 80948 141206 38437 0 3 0x4000082 thrsleep syz-fuzzer 80948 140687 38437 0 3 0x4000082 thrsleep syz-fuzzer 80948 245860 38437 0 3 0x4000082 thrsleep syz-fuzzer 80948 45988 38437 0 3 0x4000082 thrsleep syz-fuzzer 38437 207115 2324 0 3 0x10008a pause ksh 2324 34012 17190 0 3 0x92 select sshd 48290 386037 1 0 3 0x100083 ttyin getty 17190 105897 1 0 3 0x80 select sshd 70397 352925 76735 73 3 0x100090 kqread syslogd 76735 159363 1 0 3 0x100082 netio syslogd 95082 421979 1 77 3 0x100090 poll dhclient 59960 471530 1 0 3 0x80 poll dhclient 30117 86013 0 0 2 0x14200 zerothread 80071 446515 0 0 3 0x14200 aiodoned aiodoned 95468 187072 0 0 3 0x14200 syncer update 41313 425081 0 0 3 0x14200 cleaner cleaner 73091 9226 0 0 3 0x14200 reaper reaper 27291 62256 0 0 3 0x14200 pgdaemon pagedaemon 90538 28333 0 0 3 0x14200 bored crynlk 76198 103175 0 0 3 0x14200 bored crypto 55617 271712 0 0 3 0x40014200 acpi0 acpi0 51434 246410 0 0 3 0x40014200 idle1 84507 466688 0 0 3 0x14200 bored softnet 89086 309927 0 0 3 0x14200 bored systqmp 2807 336559 0 0 3 0x14200 bored systq 6926 200853 0 0 3 0x40014200 bored softclock 60824 21690 0 0 3 0x40014200 idle0 84795 228632 0 0 3 0x14200 bored smr 1 321199 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 29243 (syz-executor.1) thread 0xffff800020ade510 (479906) exclusive rrwlock inode r = 0 (0xfffffd80677b56f8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:309 #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 vn_write+0x11b sys/kern/vfs_vnops.c:411 #6 dofilewritev+0x1b7 sys/kern/sys_generic.c:364 #7 sys_pwritev+0xb8 sys/kern/vfs_syscalls.c:3260 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #9 Xsyscall+0x128 Process 29243 (syz-executor.1) thread 0xffff800020adeef0 (358462) 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 9486 6334K 6334K 78643K 10934 0 pcb 13 10K 12K 78643K 15 0 rtable 105 3K 3K 78643K 3977 0 ifaddr 39 11K 12K 78643K 677 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 174 0 iov 1 12K 64K 78643K 861 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 3157 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 60 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 1738 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 8 25K 33K 78643K 3566 0 sigio 0 0K 0K 78643K 154 0 proc 48 50K 83K 78643K 4525 0 subproc 34 2K 2K 78643K 1547 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 1K 78643K 915 0 in_multi 33 2K 2K 78643K 1095 0 ether_multi 1 0K 0K 78643K 7 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 156 689K 689K 78643K 156 0 exec 0 0K 1K 78643K 1738 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 172 26K 39K 78643K 15486 0 UVM aobj 130 5K 5K 78643K 138 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 262 0 NDP 5 0K 0K 78643K 276 0 temp 106 3034K 3127K 78643K 23538 0 kqueue 0 0K 0K 78643K 866 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 64 192 0 186 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 660 0 658 1 0 1 1 0 8 0 rtentry 112 943 0 899 2 0 2 2 0 8 0 unpcb 120 8739 0 8731 20 19 1 3 0 8 0 syncache 264 43 0 43 20 20 0 1 0 8 0 sackhl 24 2 0 2 2 2 0 1 0 8 0 tcpqe 32 388 0 388 12 12 0 2 0 8 0 tcpcb 544 2359 0 2354 46 45 1 15 0 8 0 ipq 40 46 0 46 15 15 0 1 0 8 0 ipqe 40 1548 0 1548 15 15 0 1 0 8 0 inpcb 280 5228 0 5220 39 37 2 9 0 8 0 ip6q 72 3 0 3 3 3 0 1 0 8 0 ip6af 40 6 0 6 3 3 0 1 0 8 0 nd6 48 182 0 178 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 4142 0 3927 14 0 14 14 0 8 0 art_table 32 4143 0 3927 2 0 2 2 0 8 0 art_node 16 942 0 902 1 0 1 1 0 8 0 sysvmsgpl 40 87 0 51 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 1734 0 1724 1 0 1 1 0 8 0 shmpl 112 136 0 8 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 4867 0 3457 46 0 46 46 0 8 0 ffsino 272 4867 0 3457 100 5 95 95 0 8 0 nchpl 144 9818 0 8206 61 0 61 61 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 52108 0 52108 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 29210 0 29209 35 32 3 7 0 8 2 plimitpl 152 713 0 704 1 0 1 1 0 8 0 sigapl 432 3470 0 3454 7 5 2 3 0 8 0 futexpl 56 92675 0 92675 1 0 1 1 0 8 1 knotepl 112 4698 0 4679 20 19 1 3 0 8 0 kqueuepl 104 5894 0 5891 7 6 1 4 0 8 0 pipepl 160 6390 0 6367 3 1 2 2 0 8 1 fdescpl 488 3471 0 3454 3 0 3 3 0 8 0 filepl 152 52835 0 52732 60 52 8 14 0 8 3 lockfpl 104 849 0 847 1 0 1 1 0 8 0 lockfspl 48 291 0 289 1 0 1 1 0 8 0 sessionpl 112 106 0 96 1 0 1 1 0 8 0 pgrppl 48 159 0 149 1 0 1 1 0 8 0 ucredpl 96 8362 0 8353 1 0 1 1 0 8 0 zombiepl 144 3454 0 3454 1 0 1 1 0 8 1 processpl 904 3487 0 3454 4 0 4 4 0 8 0 procpl 632 10635 0 10588 5 0 5 5 0 8 1 srpgc 64 178 0 178 19 18 1 1 0 8 1 sosppl 128 45 0 45 13 13 0 1 0 8 0 sockpl 384 14747 0 14729 81 76 5 14 0 8 2 mcl64k 65536 41 0 0 4 1 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 33 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 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 11 0 0 1 0 1 1 0 8 0 mcl2k 2048 201 0 0 23 1 22 23 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 647 0 0 22 0 22 22 0 8 0 bufpl 280 16181 0 9115 506 1 505 506 0 8 0 anonpl 16 607447 0 589459 188 115 73 80 0 125 0 amapchunkpl 152 38848 0 38691 86 79 7 20 0 158 0 amappl16 192 19401 0 18281 211 154 57 57 0 8 0 amappl15 184 522 0 518 1 0 1 1 0 8 0 amappl14 176 1105 0 1100 1 0 1 1 0 8 0 amappl13 168 294 0 294 8 8 0 1 0 8 0 amappl12 160 425 0 416 1 0 1 1 0 8 0 amappl11 152 552 0 541 1 0 1 1 0 8 0 amappl10 144 269 0 264 1 0 1 1 0 8 0 amappl9 136 1767 0 1763 1 0 1 1 0 8 0 amappl8 128 1309 0 1240 3 0 3 3 0 8 0 amappl7 120 846 0 829 1 0 1 1 0 8 0 amappl6 112 391 0 378 1 0 1 1 0 8 0 amappl5 104 1833 0 1823 1 0 1 1 0 8 0 amappl4 96 3789 0 3754 1 0 1 1 0 8 0 amappl3 88 1127 0 1119 1 0 1 1 0 8 0 amappl2 80 20543 0 20460 3 1 2 3 0 8 0 amappl1 72 108816 0 108336 40 30 10 20 0 8 1 amappl 80 12441 0 12390 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 64 137 0 8 3 0 3 3 0 8 0 uaddrrnd 24 3471 0 3454 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3471 0 3454 1 0 1 1 0 8 0 vmmpekpl 168 47227 0 47199 2 0 2 2 0 8 0 vmmpepl 168 515334 0 512783 260 127 133 133 0 357 22 vmsppl 368 3470 0 3454 2 0 2 2 0 8 0 pdppl 4096 6949 0 6908 6 0 6 6 0 8 0 pvpl 32 1678744 0 1657315 411 238 173 196 0 265 0 pmappl 232 3470 0 3454 17 15 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 238 0 55 6 0 6 6 0 8 0