witness: lock order reversal: 1st 0xfffffd807f004b98 vmmaplk (&map->lock) 2nd 0xfffffd807e2004e8 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 witness_checkorder(fffffd807e2004e8,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd807e2004e8,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd807e2004d8,81) at rw_enter+0xd4 rrw_enter(fffffd807e2004d8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd8067792758,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd8067792758,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd8067791d80,ffff800024953938,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd8067791d80,0,ffff800024953b90,ffff800024953b24,0,0) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f004b80,20002000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f004b80,20002000,20005000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f004b80,fffffd8067de8b90,fffffd8067de8a40,ffff800022b48000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020aa1680,ffff800024953d88,ffff800024953dd0) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024953e50) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024953e50) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xacaff5da80, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff8000249535b0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022b48000 rax 0xffff800000abcd40 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0x8085ab46758f541f r12 0xfffffd800297b100 r13 0 r14 0xffffffff825e7a30 w_lodata+0x40cc0 r15 0xffffffff825fbbf0 w_lodata+0x54e80 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000249535a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=339703 stat=onproc flags process=10 proc=4000000 pri=57, usrpri=57, nice=20 forw=0xffffffffffffffff, list=0xffff800020aa1408,0xffffffff82659068 process=0xffff800020aa2728 user=0xffff80002494e000, vmspace=0xfffffd807f004b80 estcpu=7, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 96784 128400 27632 32767 7 0x10 syz-executor.1 96784 202290 27632 32767 3 0x4000090 ttyout syz-executor.1 *96784 339703 27632 32767 7 0x4000010 syz-executor.1 16694 138505 497 32767 3 0x90 nanosleep syz-executor.0 16694 219325 497 32767 3 0x4000090 piperd syz-executor.0 16694 61362 497 32767 3 0x4000090 pipewr syz-executor.0 16694 192401 497 32767 3 0x4000090 fsleep syz-executor.0 27632 117575 86476 32767 3 0x90 nanosleep syz-executor.1 86476 380062 38069 0 3 0x82 wait syz-executor.1 497 149351 73596 32767 3 0x90 nanosleep syz-executor.0 73596 441973 38069 0 3 0x82 wait syz-executor.0 62740 6770 0 0 3 0x14200 bored sosplice 38069 393928 40405 0 3 0x82 thrsleep syz-fuzzer 38069 498784 40405 0 3 0x4000082 thrsleep syz-fuzzer 38069 427674 40405 0 3 0x4000082 thrsleep syz-fuzzer 38069 178380 40405 0 3 0x4000082 thrsleep syz-fuzzer 38069 58765 40405 0 3 0x4000082 thrsleep syz-fuzzer 38069 149001 40405 0 3 0x4000082 thrsleep syz-fuzzer 38069 200491 40405 0 3 0x4000082 thrsleep syz-fuzzer 38069 32959 40405 0 3 0x4000082 thrsleep syz-fuzzer 38069 474986 40405 0 3 0x4000082 kqread syz-fuzzer 38069 505304 40405 0 3 0x4000082 thrsleep syz-fuzzer 40405 392516 18961 0 3 0x10008a pause ksh 18961 291290 61065 0 3 0x92 select sshd 84650 367298 1 0 3 0x100083 ttyin getty 61065 435043 1 0 3 0x80 select sshd 73189 181999 84623 73 3 0x100090 kqread syslogd 84623 159812 1 0 3 0x100082 netio syslogd 78496 41670 1 77 3 0x100090 poll dhclient 94659 373258 1 0 3 0x80 poll dhclient 6818 363487 0 0 3 0x14200 pgzero zerothread 31836 481391 0 0 3 0x14200 aiodoned aiodoned 10082 210483 0 0 3 0x14200 syncer update 92580 215654 0 0 3 0x14200 cleaner cleaner 69112 233179 0 0 3 0x14200 reaper reaper 69368 346199 0 0 3 0x14200 pgdaemon pagedaemon 88692 136876 0 0 3 0x14200 bored crynlk 2088 238048 0 0 3 0x14200 bored crypto 53743 137063 0 0 3 0x14200 bored viomb 49202 295247 0 0 3 0x40014200 acpi0 acpi0 52488 421431 0 0 3 0x40014200 idle1 34169 462260 0 0 3 0x14200 bored softnet 33122 5020 0 0 3 0x14200 bored systqmp 13842 379454 0 0 3 0x14200 bored systq 71888 44274 0 0 3 0x40014200 bored softclock 32915 48318 0 0 3 0x40014200 idle0 50475 213737 0 0 3 0x14200 bored smr 1 484854 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 96784 (syz-executor.1) thread 0xffff800020aa1680 (339703) shared rwlock vmmaplk r = 0 (0xfffffd807f004b98) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9496 6343K 6343K 78643K 11327 0 pcb 13 10K 12K 78643K 15 0 rtable 105 3K 3K 78643K 8211 0 ifaddr 39 13K 15K 78643K 1344 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 468 0 iov 0 0K 64K 78643K 1821 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 5571 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 137 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 12707 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 8 25K 33K 78643K 10108 0 sigio 0 0K 0K 78643K 233 0 proc 48 50K 83K 78643K 9104 0 subproc 34 2K 2K 78643K 3179 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1724 0 in_multi 33 2K 2K 78643K 2359 0 ether_multi 1 0K 0K 78643K 30 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 3468 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 195 35K 39K 78643K 44421 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 677 0 NDP 5 0K 0K 78643K 564 0 temp 106 3034K 3124K 78643K 49403 0 kqueue 0 0K 0K 78643K 256 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 412 0 406 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 3380 0 3377 1 0 1 1 0 8 0 rtentry 112 1931 0 1887 2 0 2 2 0 8 0 unpcb 120 18778 0 18759 48 46 2 2 0 8 1 syncache 264 93 0 93 45 44 1 1 0 8 1 sackhl 24 5 0 5 4 4 0 1 0 8 0 tcpqe 32 30 0 30 23 22 1 1 0 8 1 tcpcb 544 5721 0 5716 95 93 2 14 0 8 1 ipq 40 115 0 115 50 49 1 1 0 8 1 ipqe 40 3929 0 3929 50 49 1 1 0 8 1 inpcb 280 16388 0 16380 144 142 2 10 0 8 1 ip6q 72 3 0 3 2 2 0 1 0 8 0 ip6af 40 8 0 8 2 2 0 1 0 8 0 nd6 48 374 0 370 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 8514 0 8299 14 0 14 14 0 8 0 art_table 32 8515 0 8299 2 0 2 2 0 8 0 art_node 16 1930 0 1890 1 0 1 1 0 8 0 sysvmsgpl 40 37 0 25 1 0 1 1 0 8 0 semapl 112 12705 0 12695 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 11899 0 10475 46 0 46 46 0 8 0 ffsino 272 11899 0 10475 99 4 95 96 0 8 0 nchpl 144 27831 0 26201 62 1 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 117079 0 117079 5 4 1 2 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 76785 0 76785 97 96 1 7 0 8 1 plimitpl 152 1513 0 1504 1 0 1 1 0 8 0 sigapl 432 9724 0 9708 5 3 2 3 0 8 0 futexpl 56 244945 0 244944 2 1 1 1 0 8 0 knotepl 112 4950 0 4931 24 23 1 3 0 8 0 kqueuepl 104 9237 0 9234 20 19 1 4 0 8 0 pipepl 160 28772 0 28749 18 15 3 3 0 8 1 fdescpl 488 9725 0 9708 3 0 3 3 0 8 0 filepl 152 126560 0 126449 204 197 7 14 0 8 2 lockfpl 104 2414 0 2413 1 0 1 1 0 8 0 lockfspl 48 766 0 765 1 0 1 1 0 8 0 sessionpl 112 202 0 192 1 0 1 1 0 8 0 pgrppl 48 490 0 480 1 0 1 1 0 8 0 ucredpl 96 17428 0 17419 1 0 1 1 0 8 0 zombiepl 144 9708 0 9708 1 0 1 1 0 8 1 processpl 904 9742 0 9708 6 2 4 5 0 8 0 procpl 632 34940 0 34892 10 4 6 6 0 8 1 srpgc 64 370 0 370 105 104 1 1 0 8 1 sosppl 128 255 0 255 74 73 1 1 0 8 1 sockpl 384 38725 0 38695 270 263 7 15 0 8 3 mcl64k 65536 35 0 0 3 0 3 3 0 8 0 mcl16k 16384 76 0 0 7 5 2 3 0 8 0 mcl12k 12288 65 0 0 3 1 2 2 0 8 0 mcl9k 9216 38 0 0 2 0 2 2 0 8 0 mcl8k 8192 73 0 0 6 3 3 3 0 8 0 mcl4k 4096 32 0 0 3 0 3 3 0 8 0 mcl2k2 2112 23 0 0 2 0 2 2 0 8 0 mcl2k 2048 210 0 0 18 7 11 18 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 2451 0 0 32 0 32 32 0 8 0 bufpl 280 29771 0 22705 505 0 505 505 0 8 0 anonpl 16 1406129 0 1391751 356 289 67 80 0 125 0 amapchunkpl 152 107667 0 107403 306 295 11 20 0 158 0 amappl16 192 48306 0 47444 550 505 45 57 0 8 0 amappl15 184 1606 0 1603 1 0 1 1 0 8 0 amappl14 176 2549 0 2544 1 0 1 1 0 8 0 amappl13 168 806 0 804 30 29 1 1 0 8 0 amappl12 160 1185 0 1180 2 1 1 1 0 8 0 amappl11 152 1132 0 1121 1 0 1 1 0 8 0 amappl10 144 2283 0 2276 1 0 1 1 0 8 0 amappl9 136 3762 0 3756 1 0 1 1 0 8 0 amappl8 128 2672 0 2581 6 2 4 4 0 8 0 amappl7 120 3464 0 3448 1 0 1 1 0 8 0 amappl6 112 719 0 706 1 0 1 1 0 8 0 amappl5 104 2876 0 2866 1 0 1 1 0 8 0 amappl4 96 9981 0 9945 1 0 1 1 0 8 0 amappl3 88 2132 0 2123 1 0 1 1 0 8 0 amappl2 80 65743 0 65663 3 1 2 3 0 8 0 amappl1 72 289634 0 289148 24 14 10 20 0 8 0 amappl 80 38502 0 38451 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 64 137 0 8 3 0 3 3 0 8 0 uaddrrnd 24 9725 0 9708 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 9725 0 9708 1 0 1 1 0 8 0 vmmpekpl 168 158992 0 158962 3 0 3 3 0 8 0 vmmpepl 168 1399100 0 1396767 1369 1234 135 145 0 357 25 vmsppl 368 9724 0 9708 2 0 2 2 0 8 0 pdppl 4096 19457 0 19416 6 0 6 6 0 8 0 pvpl 32 3746939 0 3729308 1054 890 164 195 0 265 6 pmappl 232 9724 0 9708 101 99 2 2 0 8 1 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 303 0 120 9 3 6 6 0 8 0